Reorganise SIMD paths to reuse abit more code
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47d606e297
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@ -1041,15 +1041,18 @@ extern "C" void DTR_Update(PlatformRenderBuffer *const platformRenderBuffer,
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DTRRender_Triangle(&renderBuffer, t4[0], t4[1], t4[2], colorRed);
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DTRRender_Triangle(&renderBuffer, t5[0], t5[1], t5[2], colorRed);
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////////////////////////////////////////////////////////////////////////
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// Draw Loaded Model
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////////////////////////////////////////////////////////////////////////
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const DqnV3 LIGHT = DqnV3_3i(0, 0, -1);
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const f32 MODEL_SCALE = DQN_MIN(renderBuffer.width, renderBuffer.height) * 0.5f;
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DTRMesh *const mesh = &state->mesh;
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DqnV3 modelP = DqnV3_3f(renderBuffer.width * 0.5f, renderBuffer.height * 0.5f, 0);
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if (1)
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{
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////////////////////////////////////////////////////////////////////////
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// Draw Loaded Model
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////////////////////////////////////////////////////////////////////////
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const DqnV3 LIGHT = DqnV3_3i(0, 0, -1);
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const f32 MODEL_SCALE = DQN_MIN(renderBuffer.width, renderBuffer.height) * 0.5f;
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DTRMesh *const mesh = &state->mesh;
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DqnV3 modelP = DqnV3_3f(renderBuffer.width * 0.5f, renderBuffer.height * 0.5f, 0);
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DTRRender_Mesh(&renderBuffer, mesh, modelP, MODEL_SCALE, LIGHT);
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DTRRender_Mesh(&renderBuffer, mesh, modelP, MODEL_SCALE, LIGHT);
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}
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}
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// Rect drawing
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@ -43,6 +43,7 @@ enum DTRDebugCounter
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enum DTRDebugCycleCount
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{
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DTRDebugCycleCount_RenderTexturedTriangle_Rasterise,
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DTRDebugCycleCount_RenderTriangle_Rasterise,
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DTRDebugCycleCount_Count,
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};
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@ -61,17 +61,20 @@ inline f32 DTRRender_SRGB1ToLinearSpacef(f32 val)
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inline DqnV4 DTRRender_SRGB1ToLinearSpaceV4(DqnV4 color)
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{
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DqnV4 result;
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#if 0
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result.r = DTRRender_SRGB1ToLinearSpacef(color.r);
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result.g = DTRRender_SRGB1ToLinearSpacef(color.g);
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result.b = DTRRender_SRGB1ToLinearSpacef(color.b);
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#else
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__m128 simdColor = _mm_set_ps(color.r, color.g, color.b, 0);
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__m128 simdResult = _mm_mul_ps(simdColor, simdColor);
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result.r = ((f32 *)&simdResult)[3];
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result.g = ((f32 *)&simdResult)[2];
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result.b = ((f32 *)&simdResult)[1];
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#endif
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if (globalDTRPlatformFlags.canUseSSE2)
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{
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__m128 simdColor = _mm_set_ps(color.r, color.g, color.b, 0);
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__m128 simdResult = _mm_mul_ps(simdColor, simdColor);
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result.r = ((f32 *)&simdResult)[3];
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result.g = ((f32 *)&simdResult)[2];
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result.b = ((f32 *)&simdResult)[1];
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}
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else
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{
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result.r = DTRRender_SRGB1ToLinearSpacef(color.r);
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result.g = DTRRender_SRGB1ToLinearSpacef(color.g);
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result.b = DTRRender_SRGB1ToLinearSpacef(color.b);
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}
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result.a = color.a;
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return result;
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@ -88,17 +91,20 @@ inline f32 DTRRender_LinearToSRGB1Spacef(f32 val)
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inline DqnV4 DTRRender_LinearToSRGB1SpaceV4(DqnV4 color)
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{
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DqnV4 result;
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#if 0
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result.r = DTRRender_LinearToSRGB1Spacef(color.r);
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result.g = DTRRender_LinearToSRGB1Spacef(color.g);
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result.b = DTRRender_LinearToSRGB1Spacef(color.b);
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#else
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__m128 simdColor = _mm_set_ps(color.r, color.g, color.b, 0);
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__m128 simdResult = _mm_sqrt_ps(simdColor);
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result.r = ((f32 *)&simdResult)[3];
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result.g = ((f32 *)&simdResult)[2];
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result.b = ((f32 *)&simdResult)[1];
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#endif
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if (globalDTRPlatformFlags.canUseSSE2)
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{
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__m128 simdColor = _mm_set_ps(color.r, color.g, color.b, 0);
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__m128 simdResult = _mm_sqrt_ps(simdColor);
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result.r = ((f32 *)&simdResult)[3];
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result.g = ((f32 *)&simdResult)[2];
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result.b = ((f32 *)&simdResult)[1];
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}
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else
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{
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result.r = DTRRender_LinearToSRGB1Spacef(color.r);
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result.g = DTRRender_LinearToSRGB1Spacef(color.g);
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result.b = DTRRender_LinearToSRGB1Spacef(color.b);
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}
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result.a = color.a;
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return result;
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@ -554,6 +560,221 @@ FILE_SCOPE void DebugBarycentricInternal(DqnV2 p, DqnV2 a, DqnV2 b, DqnV2 c, f32
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*u = 1.0f - *v - *w;
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}
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typedef struct TriangleInclusionTest
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{
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DqnV2i boundsMin;
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DqnV2i boundsMax;
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f32 signedAreaP1;
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f32 signedAreaP1DeltaX;
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f32 signedAreaP1DeltaY;
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f32 signedAreaP2;
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f32 signedAreaP2DeltaX;
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f32 signedAreaP2DeltaY;
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f32 signedAreaP3;
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f32 signedAreaP3DeltaX;
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f32 signedAreaP3DeltaY;
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f32 invSignedAreaParallelogram;
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} TriangleInclusionTest;
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typedef struct SIMDTriangleInclusionTest
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{
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DqnV2i boundsMin;
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DqnV2i boundsMax;
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__m128 vertexZValues;
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__m128 signedAreaPixelDeltaX;
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__m128 signedAreaPixelDeltaY;
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__m128 invSignedAreaParallelogram_4x;
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__m128 startPixel;
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} SIMDTriangleInclusionTest;
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FILE_SCOPE TriangleInclusionTest CreateTriangleInclusionTest(const i32 clipWidth,
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const i32 clipHeight, DqnV3 p1,
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DqnV3 p2, DqnV3 p3)
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{
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f32 area2Times = ((p2.x - p1.x) * (p2.y + p1.y)) + ((p3.x - p2.x) * (p3.y + p2.y)) +
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((p1.x - p3.x) * (p1.y + p3.y));
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if (area2Times > 0)
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{
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// Clockwise swap any point to make it clockwise
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DQN_SWAP(DqnV3, p2, p3);
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}
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TriangleInclusionTest result = {};
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result.boundsMin = DqnV2i_2f(DQN_MIN(DQN_MIN(p1.x, p2.x), p3.x), DQN_MIN(DQN_MIN(p1.y, p2.y), p3.y));
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result.boundsMax = DqnV2i_2f(DQN_MAX(DQN_MAX(p1.x, p2.x), p3.x), DQN_MAX(DQN_MAX(p1.y, p2.y), p3.y));
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result.boundsMin.x = DQN_MAX(result.boundsMin.x, 0);
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result.boundsMin.y = DQN_MAX(result.boundsMin.y, 0);
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result.boundsMax.x = DQN_MIN(result.boundsMax.x, clipWidth);
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result.boundsMax.y = DQN_MIN(result.boundsMax.y, clipHeight);
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const DqnV3 a = p1;
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const DqnV3 b = p2;
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const DqnV3 c = p3;
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/*
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/////////////////////////////////////////////////////////////////////////
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// Rearranging the Determinant
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/////////////////////////////////////////////////////////////////////////
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Given two points that form a line and an extra point to test, we can
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determine whether a point lies on the line, or is to the left or right of
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a the line.
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We can do this using the PerpDotProduct conceptually known as the cross
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product in 2D. This can be expressed using the determinant and is the
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method we are using.
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First forming a 3x3 matrix of our terms with a, b being from the triangle
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and test point c, we can derive a 2x2 matrix by subtracting the 1st
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column from the 2nd and 1st column from the third.
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| ax bx cx | | (bx - ax) (cx - ax) |
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m = | ay by cy | ==> | (by - ay) (cy - ay) |
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| 1 1 1 |
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From our 2x2 representation we can calculate the determinant which gives
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us the signed area of the triangle extended into a parallelogram.
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det(m) = (bx - ax)(cy - ay) - (by - ay)(cx - ax)
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Depending on the order of the vertices supplied, if it's
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- CCW and c(x,y) is outside the line (triangle), the signed area is negative
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- CCW and c(x,y) is inside the line (triangle), the signed area is positive
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- CW and c(x,y) is outside the line (triangle), the signed area is positive
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- CW and c(x,y) is inside the line (triangle), the signed area is negative
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/////////////////////////////////////////////////////////////////////////
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// Optimising the Determinant Calculation
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/////////////////////////////////////////////////////////////////////////
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The det(m) can be rearranged if expanded to be
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SignedArea(cx, cy) = (ay - by)cx + (bx - ay)cy + (ax*by - ay*bx)
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When we scan to fill our triangle we go pixel by pixel, left to right,
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bottom to top, notice that this translates to +1 for x and +1 for y, i.e.
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The first pixel's signed area is cx, then cx+1, cx+2 .. etc
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SignedArea(cx, cy) = (ay - by)cx + (bx - ax)cy + (ax*by - ay*bx)
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SignedArea(cx+1, cy) = (ay - by)cx+1 + (bx - ax)cy + (ax*by - ay*bx)
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Then
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SignedArea(cx+1, cy) - SignedArea(cx, cy) =
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(ay - by)cx+1 + (bx - ax)cy + (ax*by - ay*bx)
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- (ay - by)cx + (bx - ax)cy + (ax*by - ay*bx)
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= (ay - by)cx+1 - (ay - by)cx
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= (ay - by)(cx+1 - cx)
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= (ay - by)(1) = (ay - by)
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Similarly when progressing in y
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SignedArea(cx, cy) = (ay - by)cx + (bx - ay)cy + (ax*by - ay*bx)
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SignedArea(cx, cy+1) = (ay - by)cx + (bx - ay)cy+1 + (ax*by - ay*bx)
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Then
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SignedArea(cx, cy+1) - SignedArea(cx, cy) =
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(ay - by)cx + (bx - ax)cy+1 + (ax*by - ay*bx)
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- (ay - by)cx + (bx - ax)cy + (ax*by - ay*bx)
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= (bx - ax)cy+1 - (bx - ax)cy
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= (bx - ax)(cy+1 - cy)
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= (bx - ax)(1) = (bx - ax)
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Then we can see that when we progress along x, we only need to change by
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the value of SignedArea by (ay - by) and similarly for y, (bx - ax)
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/////////////////////////////////////////////////////////////////////////
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// Barycentric Coordinates
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/////////////////////////////////////////////////////////////////////////
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At this point we have an equation that can be used to calculate the
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2x the signed area of a triangle, or the signed area of a parallelogram,
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the two of which are equivalent.
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det(m) = (bx - ax)(cy - ay) - (by - ay)(cx - ax)
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SignedArea(cx, cy) = (ay - by)cx + (bx - ay)cy + (ax*by - ay*bx)
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A barycentric coordinate is some coefficient on A, B, C that allows us to
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specify an arbitrary point in the triangle as a linear combination of the
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three usually with some coefficient [0, 1].
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The SignedArea turns out to be actually the barycentric coord for c(x, y)
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normalised to the sum of the parallelogram area. For example a triangle
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with points, A, B, C and an arbitrary point P inside the triangle. Then
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SignedArea(P) with vertex A and B = Barycentric Coordinate for C
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SignedArea(P) with vertex B and C = Barycentric Coordinate for A
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SignedArea(P) with vertex C and A = Barycentric Coordinate for B
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B
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/ \
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/ \
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/ P \
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/_______\
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A C
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This is normalised to the area's sum, but we can trivially turn this into
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a normalised version by dividing the area of the parallelogram, i.e.
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BaryCentricC(P) = (SignedArea(P) with vertex A and B)/SignedArea(with the orig triangle vertex)
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BaryCentricA(P) = (SignedArea(P) with vertex B and C)/SignedArea(with the orig triangle vertex)
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BaryCentricB(P) = (SignedArea(P) with vertex C and A)/SignedArea(with the orig triangle vertex)
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*/
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DqnV2i startP = result.boundsMin;
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// signed area for a, where P1 = A, P2 = B, P3 = C
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result.signedAreaP1 = ((p3.x - p2.x) * (startP.y - p2.y)) - ((p3.y - p2.y) * (startP.x - p2.x));
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result.signedAreaP1DeltaX = p2.y - p3.y;
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result.signedAreaP1DeltaY = p3.x - p2.x;
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// signed area for b
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result.signedAreaP2 = ((p1.x - p3.x) * (startP.y - p3.y)) - ((p1.y - p3.y) * (startP.x - p3.x));
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result.signedAreaP2DeltaX = p3.y - p1.y;
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result.signedAreaP2DeltaY = p1.x - p3.x;
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// signed area for c
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result.signedAreaP3 = ((p2.x - p1.x) * (startP.y - p1.y)) - ((p2.y - p1.y) * (startP.x - p1.x));
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result.signedAreaP3DeltaX = p1.y - p2.y;
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result.signedAreaP3DeltaY = p2.x - p1.x;
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f32 signedAreaParallelogram = result.signedAreaP1 + result.signedAreaP2 + result.signedAreaP3;
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if (signedAreaParallelogram == 0)
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result.invSignedAreaParallelogram = 0;
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else
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result.invSignedAreaParallelogram = (1.0f / signedAreaParallelogram);
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return result;
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}
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FILE_SCOPE SIMDTriangleInclusionTest CreateSimdTriangleInclusionTest(
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const DqnV3 p1, const DqnV3 p2, const DqnV3 p3, const TriangleInclusionTest inclusionTest)
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{
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SIMDTriangleInclusionTest result = {};
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result.boundsMin = inclusionTest.boundsMin;
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result.boundsMax = inclusionTest.boundsMax;
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// NOTE: Order is important here!
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result.vertexZValues = _mm_set_ps(0, p3.z, p2.z, p1.z);
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result.signedAreaPixelDeltaX = _mm_set_ps(0,
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inclusionTest.signedAreaP3DeltaX,
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inclusionTest.signedAreaP2DeltaX,
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inclusionTest.signedAreaP1DeltaX);
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result.signedAreaPixelDeltaY = _mm_set_ps(0,
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inclusionTest.signedAreaP3DeltaY,
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inclusionTest.signedAreaP2DeltaY,
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inclusionTest.signedAreaP1DeltaY);
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result.invSignedAreaParallelogram_4x = _mm_set_ps1(inclusionTest.invSignedAreaParallelogram);
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result.startPixel = _mm_set_ps(0, inclusionTest.signedAreaP3,
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inclusionTest.signedAreaP2,
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inclusionTest.signedAreaP1);
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return result;
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}
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inline void RasteriseTexturedTriangle(DTRRenderBuffer *const renderBuffer, const DqnV3 p1,
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const DqnV3 p2, const DqnV3 p3, const DqnV2 uv1,
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const DqnV2 uv2, const DqnV2 uv3, DTRBitmap *const texture,
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@ -739,153 +960,150 @@ inline void SIMDRasteriseTexturedTriangle(DTRRenderBuffer *const renderBuffer, c
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const __m128 INV255_4X = _mm_set_ps1(1.0f / 255.0f);
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const __m128 ZERO_4X = _mm_set_ps1(0.0f);
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const __m128 TWO_4X = _mm_set_ps1(2.0f);
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const u32 IS_GREATER_MASK = 0xF;
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// NOTE: Step size of 2 pixels across X
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signedAreaPixelDeltaX = _mm_mul_ps(signedAreaPixelDeltaX, TWO_4X);
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const u32 NUM_X_PIXELS_TO_SIMD = 2;
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const u32 NUM_Y_PIXELS_TO_SIMD = 1;
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const __m128 STEP_X_4X = _mm_set_ps1((f32)NUM_X_PIXELS_TO_SIMD);
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const __m128 STEP_Y_4X = _mm_set_ps1((f32)NUM_Y_PIXELS_TO_SIMD);
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// NOTE: Increase step size to the number of pixels rasterised with SIMD
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signedAreaPixelDeltaX = _mm_mul_ps(signedAreaPixelDeltaX, STEP_X_4X);
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signedAreaPixelDeltaY = _mm_mul_ps(signedAreaPixelDeltaY, STEP_Y_4X);
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const DqnV2 uv2SubUv1 = uv2 - uv1;
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const DqnV2 uv3SubUv1 = uv3 - uv1;
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const __m128 colorModulate = _mm_set_ps(color.a, color.b, color.g, color.r);
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const u32 texturePitch = texture->bytesPerPixel * texture->dim.w;
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const u8 *const texturePtr = texture->memory;
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for (i32 bufferY = min.y; bufferY < max.y; bufferY++)
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for (i32 bufferY = min.y; bufferY < max.y; bufferY += NUM_Y_PIXELS_TO_SIMD)
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{
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__m128 signedArea1 = signedAreaPixel1;
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__m128 signedArea2 = signedAreaPixel2;
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#define PROCESS_COLOR_NO_SIMD 0
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for (i32 bufferX = min.x; bufferX < max.x; bufferX += 2)
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for (i32 bufferX = min.x; bufferX < max.x; bufferX += NUM_X_PIXELS_TO_SIMD)
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{
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__m128 isGreater1 = _mm_cmpge_ps(signedArea1, ZERO_4X);
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i32 isGreaterResult1 = _mm_movemask_ps(isGreater1);
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if ((isGreaterResult1 & IS_GREATER_MASK) == IS_GREATER_MASK)
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// Rasterise buffer(X, Y) pixel
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{
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__m128 barycentric = _mm_mul_ps(signedArea1, invSignedAreaParallelogram_4x);
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__m128 barycentricZ = _mm_mul_ps(triangleZ, barycentric);
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__m128 checkArea = signedArea1;
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__m128 isGreater = _mm_cmpge_ps(checkArea, ZERO_4X);
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i32 isGreaterResult = _mm_movemask_ps(isGreater);
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i32 posX = bufferX;
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i32 posY = bufferY;
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i32 zBufferIndex = bufferX + (bufferY * zBufferPitch);
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f32 pixelZValue = ((f32 *)&barycentricZ)[0] +
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((f32 *)&barycentricZ)[1] +
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((f32 *)&barycentricZ)[2];
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f32 currZValue = renderBuffer->zBuffer[zBufferIndex];
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if (pixelZValue > currZValue)
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if ((isGreaterResult & IS_GREATER_MASK) == IS_GREATER_MASK && posX < max.x)
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{
|
||||
renderBuffer->zBuffer[zBufferIndex] = pixelZValue;
|
||||
u8 *texturePtr = texture->memory;
|
||||
const u32 texturePitch = texture->bytesPerPixel * texture->dim.w;
|
||||
__m128 barycentric = _mm_mul_ps(checkArea, invSignedAreaParallelogram_4x);
|
||||
__m128 barycentricZ = _mm_mul_ps(triangleZ, barycentric);
|
||||
|
||||
f32 barycentricB = ((f32 *)&barycentric)[2];
|
||||
f32 barycentricC = ((f32 *)&barycentric)[0];
|
||||
DqnV2 uv = uv1 + (uv2SubUv1 * barycentricB) + (uv3SubUv1 * barycentricC);
|
||||
i32 zBufferIndex = posX + (posY * zBufferPitch);
|
||||
f32 pixelZValue = ((f32 *)&barycentricZ)[0] +
|
||||
((f32 *)&barycentricZ)[1] +
|
||||
((f32 *)&barycentricZ)[2];
|
||||
f32 currZValue = renderBuffer->zBuffer[zBufferIndex];
|
||||
if (pixelZValue > currZValue)
|
||||
{
|
||||
renderBuffer->zBuffer[zBufferIndex] = pixelZValue;
|
||||
|
||||
const f32 EPSILON = 0.1f;
|
||||
DQN_ASSERT(uv.x >= 0 && uv.x < 1.0f + EPSILON);
|
||||
DQN_ASSERT(uv.y >= 0 && uv.y < 1.0f + EPSILON);
|
||||
uv.x = DqnMath_Clampf(uv.x, 0.0f, 1.0f);
|
||||
uv.y = DqnMath_Clampf(uv.y, 0.0f, 1.0f);
|
||||
f32 barycentricB = ((f32 *)&barycentric)[2];
|
||||
f32 barycentricC = ((f32 *)&barycentric)[0];
|
||||
DqnV2 uv = uv1 + (uv2SubUv1 * barycentricB) + (uv3SubUv1 * barycentricC);
|
||||
|
||||
f32 texelXf = uv.x * texture->dim.w;
|
||||
f32 texelYf = uv.y * texture->dim.h;
|
||||
DQN_ASSERT(texelXf >= 0 && texelXf < texture->dim.w);
|
||||
DQN_ASSERT(texelYf >= 0 && texelYf < texture->dim.h);
|
||||
const f32 EPSILON = 0.1f;
|
||||
DQN_ASSERT(uv.x >= 0 && uv.x < 1.0f + EPSILON);
|
||||
DQN_ASSERT(uv.y >= 0 && uv.y < 1.0f + EPSILON);
|
||||
uv.x = DqnMath_Clampf(uv.x, 0.0f, 1.0f);
|
||||
uv.y = DqnMath_Clampf(uv.y, 0.0f, 1.0f);
|
||||
|
||||
i32 texelX = (i32)texelXf;
|
||||
i32 texelY = (i32)texelYf;
|
||||
f32 texelXf = uv.x * texture->dim.w;
|
||||
f32 texelYf = uv.y * texture->dim.h;
|
||||
DQN_ASSERT(texelXf >= 0 && texelXf < texture->dim.w);
|
||||
DQN_ASSERT(texelYf >= 0 && texelYf < texture->dim.h);
|
||||
|
||||
u32 texel1 = *(u32 *)(texturePtr + (texelX * texture->bytesPerPixel) +
|
||||
(texelY * texturePitch));
|
||||
i32 texelX = (i32)texelXf;
|
||||
i32 texelY = (i32)texelYf;
|
||||
|
||||
#if PROCESS_COLOR_NO_SIMD
|
||||
DqnV4 color1;
|
||||
color1.a = (f32)(texel1 >> 24);
|
||||
color1.b = (f32)((texel1 >> 16) & 0xFF);
|
||||
color1.g = (f32)((texel1 >> 8) & 0xFF);
|
||||
color1.r = (f32)((texel1 >> 0) & 0xFF);
|
||||
color1 *= DTRRENDER_INV_255;
|
||||
color1 = DTRRender_SRGB1ToLinearSpaceV4(color1);
|
||||
DqnV4 blend = color * color1;
|
||||
#else
|
||||
__m128 color1 =
|
||||
_mm_set_ps((f32)(texel1 >> 24), (f32)((texel1 >> 16) & 0xFF),
|
||||
(f32)((texel1 >> 8) & 0xFF), (f32)((texel1 >> 0) & 0xFF));
|
||||
color1 = _mm_mul_ps(color1, INV255_4X);
|
||||
color1 = _mm_mul_ps(color1, color1); // to linear space
|
||||
color1 = _mm_mul_ps(color1, colorModulate);
|
||||
u32 texel1 = *(u32 *)(texturePtr + (texelX * texture->bytesPerPixel) + (texelY * texturePitch));
|
||||
|
||||
DqnV4 blend = {};
|
||||
blend.r = ((f32 *)&color1)[0];
|
||||
blend.g = ((f32 *)&color1)[1];
|
||||
blend.b = ((f32 *)&color1)[2];
|
||||
blend.a = ((f32 *)&color1)[3];
|
||||
#endif
|
||||
SetPixel(renderBuffer, bufferX, bufferY, blend, ColorSpace_Linear);
|
||||
__m128 color1 = _mm_set_ps((f32)(texel1 >> 24),
|
||||
(f32)((texel1 >> 16) & 0xFF),
|
||||
(f32)((texel1 >> 8) & 0xFF),
|
||||
(f32)((texel1 >> 0) & 0xFF));
|
||||
color1 = _mm_mul_ps(color1, INV255_4X);
|
||||
f32 preserveAlpha = ((f32 *)&color1)[3];
|
||||
color1 = _mm_mul_ps(color1, color1); // to linear space
|
||||
((f32 *)&color1)[3] = preserveAlpha;
|
||||
color1 = _mm_mul_ps(color1, colorModulate);
|
||||
|
||||
DqnV4 blend = {};
|
||||
blend.r = ((f32 *)&color1)[0];
|
||||
blend.g = ((f32 *)&color1)[1];
|
||||
blend.b = ((f32 *)&color1)[2];
|
||||
blend.a = ((f32 *)&color1)[3];
|
||||
SetPixel(renderBuffer, posX, posY, blend, ColorSpace_Linear);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
__m128 isGreater2 = _mm_cmpge_ps(signedArea2, ZERO_4X);
|
||||
i32 isGreaterResult2 = _mm_movemask_ps(isGreater2);
|
||||
i32 bufferX1 = bufferX + 1;
|
||||
if ((isGreaterResult2 & IS_GREATER_MASK) == IS_GREATER_MASK && bufferX1 < max.x)
|
||||
// Rasterise buffer(X + 1, Y) pixel
|
||||
{
|
||||
__m128 barycentric = _mm_mul_ps(signedArea2, invSignedAreaParallelogram_4x);
|
||||
__m128 barycentricZ = _mm_mul_ps(triangleZ, barycentric);
|
||||
|
||||
i32 zBufferIndex = bufferX1 + (bufferY * zBufferPitch);
|
||||
f32 pixelZValue = ((f32 *)&barycentricZ)[0] + ((f32 *)&barycentricZ)[1] +
|
||||
((f32 *)&barycentricZ)[2];
|
||||
f32 currZValue = renderBuffer->zBuffer[zBufferIndex];
|
||||
if (pixelZValue > currZValue)
|
||||
__m128 checkArea = signedArea2;
|
||||
__m128 isGreater = _mm_cmpge_ps(checkArea, ZERO_4X);
|
||||
i32 isGreaterResult = _mm_movemask_ps(isGreater);
|
||||
i32 posX = bufferX + 1;
|
||||
i32 posY = bufferY;
|
||||
if ((isGreaterResult & IS_GREATER_MASK) == IS_GREATER_MASK && posX < max.x)
|
||||
{
|
||||
renderBuffer->zBuffer[zBufferIndex] = pixelZValue;
|
||||
u8 *texturePtr = texture->memory;
|
||||
const u32 texturePitch = texture->bytesPerPixel * texture->dim.w;
|
||||
__m128 barycentric = _mm_mul_ps(checkArea, invSignedAreaParallelogram_4x);
|
||||
__m128 barycentricZ = _mm_mul_ps(triangleZ, barycentric);
|
||||
|
||||
f32 barycentricB = ((f32 *)&barycentric)[2];
|
||||
f32 barycentricC = ((f32 *)&barycentric)[0];
|
||||
DqnV2 uv = uv1 + (uv2SubUv1 * barycentricB) + (uv3SubUv1 * barycentricC);
|
||||
i32 zBufferIndex = posX + (posY * zBufferPitch);
|
||||
f32 pixelZValue = ((f32 *)&barycentricZ)[0] +
|
||||
((f32 *)&barycentricZ)[1] +
|
||||
((f32 *)&barycentricZ)[2];
|
||||
f32 currZValue = renderBuffer->zBuffer[zBufferIndex];
|
||||
if (pixelZValue > currZValue)
|
||||
{
|
||||
renderBuffer->zBuffer[zBufferIndex] = pixelZValue;
|
||||
|
||||
const f32 EPSILON = 0.1f;
|
||||
DQN_ASSERT(uv.x >= 0 && uv.x < 1.0f + EPSILON);
|
||||
DQN_ASSERT(uv.y >= 0 && uv.y < 1.0f + EPSILON);
|
||||
uv.x = DqnMath_Clampf(uv.x, 0.0f, 1.0f);
|
||||
uv.y = DqnMath_Clampf(uv.y, 0.0f, 1.0f);
|
||||
f32 barycentricB = ((f32 *)&barycentric)[2];
|
||||
f32 barycentricC = ((f32 *)&barycentric)[0];
|
||||
DqnV2 uv = uv1 + (uv2SubUv1 * barycentricB) + (uv3SubUv1 * barycentricC);
|
||||
|
||||
f32 texelXf = uv.x * texture->dim.w;
|
||||
f32 texelYf = uv.y * texture->dim.h;
|
||||
DQN_ASSERT(texelXf >= 0 && texelXf < texture->dim.w);
|
||||
DQN_ASSERT(texelYf >= 0 && texelYf < texture->dim.h);
|
||||
const f32 EPSILON = 0.1f;
|
||||
DQN_ASSERT(uv.x >= 0 && uv.x < 1.0f + EPSILON);
|
||||
DQN_ASSERT(uv.y >= 0 && uv.y < 1.0f + EPSILON);
|
||||
uv.x = DqnMath_Clampf(uv.x, 0.0f, 1.0f);
|
||||
uv.y = DqnMath_Clampf(uv.y, 0.0f, 1.0f);
|
||||
|
||||
i32 texelX = (i32)texelXf;
|
||||
i32 texelY = (i32)texelYf;
|
||||
f32 texelXf = uv.x * texture->dim.w;
|
||||
f32 texelYf = uv.y * texture->dim.h;
|
||||
DQN_ASSERT(texelXf >= 0 && texelXf < texture->dim.w);
|
||||
DQN_ASSERT(texelYf >= 0 && texelYf < texture->dim.h);
|
||||
|
||||
u32 texel1 = *(u32 *)(texturePtr + (texelX * texture->bytesPerPixel) +
|
||||
(texelY * texturePitch));
|
||||
i32 texelX = (i32)texelXf;
|
||||
i32 texelY = (i32)texelYf;
|
||||
|
||||
#if PROCESS_COLOR_NO_SIMD
|
||||
DqnV4 color1;
|
||||
color1.a = (f32)(texel1 >> 24);
|
||||
color1.b = (f32)((texel1 >> 16) & 0xFF);
|
||||
color1.g = (f32)((texel1 >> 8) & 0xFF);
|
||||
color1.r = (f32)((texel1 >> 0) & 0xFF);
|
||||
color1 *= DTRRENDER_INV_255;
|
||||
color1 = DTRRender_SRGB1ToLinearSpaceV4(color1);
|
||||
DqnV4 blend = color * color1;
|
||||
#else
|
||||
__m128 color1 =
|
||||
_mm_set_ps((f32)(texel1 >> 24), (f32)((texel1 >> 16) & 0xFF),
|
||||
(f32)((texel1 >> 8) & 0xFF), (f32)((texel1 >> 0) & 0xFF));
|
||||
color1 = _mm_mul_ps(color1, INV255_4X);
|
||||
color1 = _mm_mul_ps(color1, color1); // to linear space
|
||||
color1 = _mm_mul_ps(color1, colorModulate);
|
||||
u32 texel1 = *(u32 *)(texturePtr + (texelX * texture->bytesPerPixel) + (texelY * texturePitch));
|
||||
|
||||
DqnV4 blend = {};
|
||||
blend.r = ((f32 *)&color1)[0];
|
||||
blend.g = ((f32 *)&color1)[1];
|
||||
blend.b = ((f32 *)&color1)[2];
|
||||
blend.a = ((f32 *)&color1)[3];
|
||||
#endif
|
||||
SetPixel(renderBuffer, bufferX1, bufferY, blend, ColorSpace_Linear);
|
||||
__m128 color1 = _mm_set_ps((f32)(texel1 >> 24),
|
||||
(f32)((texel1 >> 16) & 0xFF),
|
||||
(f32)((texel1 >> 8) & 0xFF),
|
||||
(f32)((texel1 >> 0) & 0xFF));
|
||||
color1 = _mm_mul_ps(color1, INV255_4X);
|
||||
f32 preserveAlpha = ((f32 *)&color1)[3];
|
||||
color1 = _mm_mul_ps(color1, color1); // to linear space
|
||||
((f32 *)&color1)[3] = preserveAlpha;
|
||||
color1 = _mm_mul_ps(color1, colorModulate);
|
||||
|
||||
DqnV4 blend = {};
|
||||
blend.r = ((f32 *)&color1)[0];
|
||||
blend.g = ((f32 *)&color1)[1];
|
||||
blend.b = ((f32 *)&color1)[2];
|
||||
blend.a = ((f32 *)&color1)[3];
|
||||
SetPixel(renderBuffer, posX, posY, blend, ColorSpace_Linear);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -931,7 +1149,7 @@ void DTRRender_TexturedTriangle(DTRRenderBuffer *const renderBuffer, DqnV3 p1, D
|
||||
DQN_SWAP(DqnV3, p2, p3);
|
||||
}
|
||||
|
||||
DTRDebug_BeginCycleCount(DTRDebugCycleCount_RenderTriangle_Rasterise);
|
||||
DTRDebug_BeginCycleCount(DTRDebugCycleCount_RenderTexturedTriangle_Rasterise);
|
||||
////////////////////////////////////////////////////////////////////////////
|
||||
// Scan and Render
|
||||
////////////////////////////////////////////////////////////////////////////
|
||||
@ -943,7 +1161,7 @@ void DTRRender_TexturedTriangle(DTRRenderBuffer *const renderBuffer, DqnV3 p1, D
|
||||
{
|
||||
RasteriseTexturedTriangle(renderBuffer, p1, p2, p3, uv1, uv2, uv3, texture, color);
|
||||
}
|
||||
DTRDebug_EndCycleCount(DTRDebugCycleCount_RenderTriangle_Rasterise);
|
||||
DTRDebug_EndCycleCount(DTRDebugCycleCount_RenderTexturedTriangle_Rasterise);
|
||||
|
||||
////////////////////////////////////////////////////////////////////////////
|
||||
// Debug
|
||||
@ -1075,6 +1293,35 @@ void DTRRender_Mesh(DTRRenderBuffer *const renderBuffer, DTRMesh *const mesh, co
|
||||
}
|
||||
}
|
||||
|
||||
FILE_SCOPE inline void SIMDRasteriseTriangle(DTRRenderBuffer *const renderBuffer,
|
||||
const SIMDTriangleInclusionTest simdTri,
|
||||
const i32 posX, const i32 posY, const DqnV4 color,
|
||||
__m128 *const signedArea)
|
||||
{
|
||||
__m128 ZERO_4X = _mm_set_ps1(0.0f);
|
||||
u32 IS_GREATER_MASK = 0xF;
|
||||
const u32 zBufferPitch = renderBuffer->width;
|
||||
|
||||
__m128 isGreater = _mm_cmpge_ps(*signedArea, ZERO_4X);
|
||||
i32 isGreaterResult = _mm_movemask_ps(isGreater);
|
||||
if ((isGreaterResult & IS_GREATER_MASK) == IS_GREATER_MASK)
|
||||
{
|
||||
__m128 barycentric = _mm_mul_ps(*signedArea, simdTri.invSignedAreaParallelogram_4x);
|
||||
__m128 barycentricZ = _mm_mul_ps(simdTri.vertexZValues, barycentric);
|
||||
|
||||
i32 zBufferIndex = posX + (posY * zBufferPitch);
|
||||
f32 pixelZValue =
|
||||
((f32 *)&barycentricZ)[0] + ((f32 *)&barycentricZ)[1] + ((f32 *)&barycentricZ)[2];
|
||||
f32 currZValue = renderBuffer->zBuffer[zBufferIndex];
|
||||
if (pixelZValue > currZValue)
|
||||
{
|
||||
renderBuffer->zBuffer[zBufferIndex] = pixelZValue;
|
||||
SetPixel(renderBuffer, posX, posY, color, ColorSpace_Linear);
|
||||
}
|
||||
}
|
||||
*signedArea = _mm_add_ps(*signedArea, simdTri.signedAreaPixelDeltaX);
|
||||
}
|
||||
|
||||
void DTRRender_Triangle(DTRRenderBuffer *const renderBuffer, DqnV3 p1, DqnV3 p2, DqnV3 p3,
|
||||
DqnV4 color, const DTRRenderTransform transform)
|
||||
{
|
||||
@ -1099,189 +1346,137 @@ void DTRRender_Triangle(DTRRenderBuffer *const renderBuffer, DqnV3 p1, DqnV3 p2,
|
||||
color = DTRRender_SRGB1ToLinearSpaceV4(color);
|
||||
color = PreMultiplyAlpha1(color);
|
||||
|
||||
////////////////////////////////////////////////////////////////////////////
|
||||
// Calculate Bounding Box
|
||||
////////////////////////////////////////////////////////////////////////////
|
||||
DqnV2i max = DqnV2i_2f(DQN_MAX(DQN_MAX(p1.x, p2.x), p3.x),
|
||||
DQN_MAX(DQN_MAX(p1.y, p2.y), p3.y));
|
||||
DqnV2i min = DqnV2i_2f(DQN_MIN(DQN_MIN(p1.x, p2.x), p3.x),
|
||||
DQN_MIN(DQN_MIN(p1.y, p2.y), p3.y));
|
||||
min.x = DQN_MAX(min.x, 0);
|
||||
min.y = DQN_MAX(min.y, 0);
|
||||
max.x = DQN_MIN(max.x, renderBuffer->width - 1);
|
||||
max.y = DQN_MIN(max.y, renderBuffer->height - 1);
|
||||
|
||||
/*
|
||||
/////////////////////////////////////////////////////////////////////////
|
||||
// Rearranging the Determinant
|
||||
/////////////////////////////////////////////////////////////////////////
|
||||
Given two points that form a line and an extra point to test, we can
|
||||
determine whether a point lies on the line, or is to the left or right of
|
||||
a the line.
|
||||
|
||||
We can do this using the PerpDotProduct conceptually known as the cross
|
||||
product in 2D. This can be expressed using the determinant and is the
|
||||
method we are using.
|
||||
|
||||
First forming a 3x3 matrix of our terms with a, b being from the triangle
|
||||
and test point c, we can derive a 2x2 matrix by subtracting the 1st
|
||||
column from the 2nd and 1st column from the third.
|
||||
|
||||
| ax bx cx | | (bx - ax) (cx - ax) |
|
||||
m = | ay by cy | ==> | (by - ay) (cy - ay) |
|
||||
| 1 1 1 |
|
||||
|
||||
From our 2x2 representation we can calculate the determinant which gives
|
||||
us the signed area of the triangle extended into a parallelogram.
|
||||
|
||||
det(m) = (bx - ax)(cy - ay) - (by - ay)(cx - ax)
|
||||
|
||||
Depending on the order of the vertices supplied, if it's
|
||||
- CCW and c(x,y) is outside the line (triangle), the signed area is negative
|
||||
- CCW and c(x,y) is inside the line (triangle), the signed area is positive
|
||||
- CW and c(x,y) is outside the line (triangle), the signed area is positive
|
||||
- CW and c(x,y) is inside the line (triangle), the signed area is negative
|
||||
|
||||
/////////////////////////////////////////////////////////////////////////
|
||||
// Optimising the Determinant Calculation
|
||||
/////////////////////////////////////////////////////////////////////////
|
||||
The det(m) can be rearranged if expanded to be
|
||||
SignedArea(cx, cy) = (ay - by)cx + (bx - ay)cy + (ax*by - ay*bx)
|
||||
|
||||
When we scan to fill our triangle we go pixel by pixel, left to right,
|
||||
bottom to top, notice that this translates to +1 for x and +1 for y, i.e.
|
||||
|
||||
The first pixel's signed area is cx, then cx+1, cx+2 .. etc
|
||||
SignedArea(cx, cy) = (ay - by)cx + (bx - ax)cy + (ax*by - ay*bx)
|
||||
SignedArea(cx+1, cy) = (ay - by)cx+1 + (bx - ax)cy + (ax*by - ay*bx)
|
||||
|
||||
Then
|
||||
SignedArea(cx+1, cy) - SignedArea(cx, cy) =
|
||||
(ay - by)cx+1 + (bx - ax)cy + (ax*by - ay*bx)
|
||||
- (ay - by)cx + (bx - ax)cy + (ax*by - ay*bx)
|
||||
= (ay - by)cx+1 - (ay - by)cx
|
||||
= (ay - by)(cx+1 - cx)
|
||||
= (ay - by)(1) = (ay - by)
|
||||
|
||||
Similarly when progressing in y
|
||||
SignedArea(cx, cy) = (ay - by)cx + (bx - ay)cy + (ax*by - ay*bx)
|
||||
SignedArea(cx, cy+1) = (ay - by)cx + (bx - ay)cy+1 + (ax*by - ay*bx)
|
||||
|
||||
Then
|
||||
SignedArea(cx, cy+1) - SignedArea(cx, cy) =
|
||||
(ay - by)cx + (bx - ax)cy+1 + (ax*by - ay*bx)
|
||||
- (ay - by)cx + (bx - ax)cy + (ax*by - ay*bx)
|
||||
= (bx - ax)cy+1 - (bx - ax)cy
|
||||
= (bx - ax)(cy+1 - cy)
|
||||
= (bx - ax)(1) = (bx - ax)
|
||||
|
||||
Then we can see that when we progress along x, we only need to change by
|
||||
the value of SignedArea by (ay - by) and similarly for y, (bx - ax)
|
||||
|
||||
/////////////////////////////////////////////////////////////////////////
|
||||
// Barycentric Coordinates
|
||||
/////////////////////////////////////////////////////////////////////////
|
||||
At this point we have an equation that can be used to calculate the
|
||||
2x the signed area of a triangle, or the signed area of a parallelogram,
|
||||
the two of which are equivalent.
|
||||
|
||||
det(m) = (bx - ax)(cy - ay) - (by - ay)(cx - ax)
|
||||
SignedArea(cx, cy) = (ay - by)cx + (bx - ay)cy + (ax*by - ay*bx)
|
||||
|
||||
A barycentric coordinate is some coefficient on A, B, C that allows us to
|
||||
specify an arbitrary point in the triangle as a linear combination of the
|
||||
three usually with some coefficient [0, 1].
|
||||
|
||||
The SignedArea turns out to be actually the barycentric coord for c(x, y)
|
||||
normalised to the sum of the parallelogram area. For example a triangle
|
||||
with points, A, B, C and an arbitrary point P inside the triangle. Then
|
||||
|
||||
SignedArea(P) with vertex A and B = Barycentric Coordinate for C
|
||||
SignedArea(P) with vertex B and C = Barycentric Coordinate for A
|
||||
SignedArea(P) with vertex C and A = Barycentric Coordinate for B
|
||||
|
||||
B
|
||||
/ \
|
||||
/ \
|
||||
/ P \
|
||||
/_______\
|
||||
A C
|
||||
|
||||
This is normalised to the area's sum, but we can trivially turn this into
|
||||
a normalised version by dividing the area of the parallelogram, i.e.
|
||||
|
||||
BaryCentricC(P) = (SignedArea(P) with vertex A and B)/SignedArea(with the orig triangle vertex)
|
||||
BaryCentricA(P) = (SignedArea(P) with vertex B and C)/SignedArea(with the orig triangle vertex)
|
||||
BaryCentricB(P) = (SignedArea(P) with vertex C and A)/SignedArea(with the orig triangle vertex)
|
||||
*/
|
||||
|
||||
f32 area2Times = ((p2.x - p1.x) * (p2.y + p1.y)) +
|
||||
((p3.x - p2.x) * (p3.y + p2.y)) +
|
||||
((p1.x - p3.x) * (p1.y + p3.y));
|
||||
if (area2Times > 0)
|
||||
{
|
||||
// Clockwise swap any point to make it clockwise
|
||||
DQN_SWAP(DqnV3, p2, p3);
|
||||
}
|
||||
|
||||
const DqnV3 a = p1;
|
||||
const DqnV3 b = p2;
|
||||
const DqnV3 c = p3;
|
||||
|
||||
DqnV2i startP = min;
|
||||
f32 signedArea1 = ((b.x - a.x) * (startP.y - a.y)) - ((b.y - a.y) * (startP.x - a.x));
|
||||
f32 signedArea1DeltaX = a.y - b.y;
|
||||
f32 signedArea1DeltaY = b.x - a.x;
|
||||
|
||||
f32 signedArea2 = ((c.x - b.x) * (startP.y - b.y)) - ((c.y - b.y) * (startP.x - b.x));
|
||||
f32 signedArea2DeltaX = b.y - c.y;
|
||||
f32 signedArea2DeltaY = c.x - b.x;
|
||||
|
||||
f32 signedArea3 = ((a.x - c.x) * (startP.y - c.y)) - ((a.y - c.y) * (startP.x - c.x));
|
||||
f32 signedArea3DeltaX = c.y - a.y;
|
||||
f32 signedArea3DeltaY = a.x - c.x;
|
||||
|
||||
f32 signedAreaParallelogram = ((b.x - a.x) * (c.y - a.y) - (b.y - a.y) * (c.x - a.x));
|
||||
if (signedAreaParallelogram == 0) return;
|
||||
f32 invSignedAreaParallelogram = 1 / signedAreaParallelogram;
|
||||
|
||||
////////////////////////////////////////////////////////////////////////////
|
||||
// Scan and Render
|
||||
////////////////////////////////////////////////////////////////////////////
|
||||
DTRDebug_BeginCycleCount(DTRDebugCycleCount_RenderTriangle_Rasterise);
|
||||
const u32 zBufferPitch = renderBuffer->width;
|
||||
for (i32 bufferY = min.y; bufferY < max.y; bufferY++)
|
||||
if (globalDTRPlatformFlags.canUseSSE2)
|
||||
{
|
||||
f32 signedArea1Row = signedArea1;
|
||||
f32 signedArea2Row = signedArea2;
|
||||
f32 signedArea3Row = signedArea3;
|
||||
TriangleInclusionTest inclusionTest = CreateTriangleInclusionTest(
|
||||
renderBuffer->width - 1, renderBuffer->height - 1, p1, p2, p3);
|
||||
if (inclusionTest.invSignedAreaParallelogram == 0) return;
|
||||
|
||||
for (i32 bufferX = min.x; bufferX < max.x; bufferX++)
|
||||
SIMDTriangleInclusionTest simdTri =
|
||||
CreateSimdTriangleInclusionTest(p1, p2, p3, inclusionTest);
|
||||
|
||||
__m128 INV255_4X = _mm_set_ps1(1.0f / 255.0f);
|
||||
__m128 ZERO_4X = _mm_set_ps1(0.0f);
|
||||
u32 IS_GREATER_MASK = 0xF;
|
||||
|
||||
__m128 signedAreaPixel1 = simdTri.startPixel;
|
||||
__m128 signedAreaPixel2 = _mm_add_ps(signedAreaPixel1, simdTri.signedAreaPixelDeltaX);
|
||||
__m128 signedAreaPixel3 = _mm_add_ps(signedAreaPixel2, simdTri.signedAreaPixelDeltaX);
|
||||
__m128 signedAreaPixel4 = _mm_add_ps(signedAreaPixel3, simdTri.signedAreaPixelDeltaX);
|
||||
|
||||
// NOTE: Increase step size to the number of pixels rasterised with SIMD
|
||||
const u32 NUM_X_PIXELS_TO_SIMD = 2;
|
||||
const u32 NUM_Y_PIXELS_TO_SIMD = 1;
|
||||
const __m128 STEP_X_4X = _mm_set_ps1((f32)NUM_X_PIXELS_TO_SIMD);
|
||||
const __m128 STEP_Y_4X = _mm_set_ps1((f32)NUM_Y_PIXELS_TO_SIMD);
|
||||
|
||||
simdTri.signedAreaPixelDeltaX = _mm_mul_ps(simdTri.signedAreaPixelDeltaX, STEP_X_4X);
|
||||
simdTri.signedAreaPixelDeltaY = _mm_mul_ps(simdTri.signedAreaPixelDeltaY, STEP_Y_4X);
|
||||
|
||||
const DqnV2i min = inclusionTest.boundsMin;
|
||||
const DqnV2i max = inclusionTest.boundsMax;
|
||||
for (i32 bufferY = min.y; bufferY < max.y; bufferY += NUM_Y_PIXELS_TO_SIMD)
|
||||
{
|
||||
if (signedArea1Row >= 0 && signedArea2Row >= 0 && signedArea3Row >= 0)
|
||||
{
|
||||
f32 barycentricB = signedArea3Row * invSignedAreaParallelogram;
|
||||
f32 barycentricC = signedArea1Row * invSignedAreaParallelogram;
|
||||
__m128 signedArea1 = signedAreaPixel1;
|
||||
__m128 signedArea2 = signedAreaPixel2;
|
||||
|
||||
i32 zBufferIndex = bufferX + (bufferY * zBufferPitch);
|
||||
f32 pixelZValue = a.z + (barycentricB * (b.z - a.z)) + (barycentricC * (c.z - a.z));
|
||||
f32 currZValue = renderBuffer->zBuffer[zBufferIndex];
|
||||
DQN_ASSERT(zBufferIndex < (renderBuffer->width * renderBuffer->height));
|
||||
if (pixelZValue > currZValue)
|
||||
for (i32 bufferX = min.x; bufferX < max.x; bufferX += NUM_X_PIXELS_TO_SIMD)
|
||||
{
|
||||
SIMDRasteriseTriangle(renderBuffer, simdTri, bufferX, bufferY, color, &signedArea1);
|
||||
|
||||
if (bufferX + 1 < max.x)
|
||||
{
|
||||
renderBuffer->zBuffer[zBufferIndex] = pixelZValue;
|
||||
SetPixel(renderBuffer, bufferX, bufferY, color, ColorSpace_Linear);
|
||||
SIMDRasteriseTriangle(renderBuffer, simdTri, bufferX + 1, bufferY, color,
|
||||
&signedArea2);
|
||||
}
|
||||
}
|
||||
|
||||
signedArea1Row += signedArea1DeltaX;
|
||||
signedArea2Row += signedArea2DeltaX;
|
||||
signedArea3Row += signedArea3DeltaX;
|
||||
signedAreaPixel1 = _mm_add_ps(signedAreaPixel1, simdTri.signedAreaPixelDeltaY);
|
||||
signedAreaPixel2 = _mm_add_ps(signedAreaPixel2, simdTri.signedAreaPixelDeltaY);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
f32 area2Times = ((p2.x - p1.x) * (p2.y + p1.y)) + ((p3.x - p2.x) * (p3.y + p2.y)) +
|
||||
((p1.x - p3.x) * (p1.y + p3.y));
|
||||
if (area2Times > 0)
|
||||
{
|
||||
// Clockwise swap any point to make it clockwise
|
||||
DQN_SWAP(DqnV3, p2, p3);
|
||||
}
|
||||
|
||||
signedArea1 += signedArea1DeltaY;
|
||||
signedArea2 += signedArea2DeltaY;
|
||||
signedArea3 += signedArea3DeltaY;
|
||||
DqnV2i max =
|
||||
DqnV2i_2f(DQN_MAX(DQN_MAX(p1.x, p2.x), p3.x), DQN_MAX(DQN_MAX(p1.y, p2.y), p3.y));
|
||||
DqnV2i min =
|
||||
DqnV2i_2f(DQN_MIN(DQN_MIN(p1.x, p2.x), p3.x), DQN_MIN(DQN_MIN(p1.y, p2.y), p3.y));
|
||||
min.x = DQN_MAX(min.x, 0);
|
||||
min.y = DQN_MAX(min.y, 0);
|
||||
max.x = DQN_MIN(max.x, renderBuffer->width - 1);
|
||||
max.y = DQN_MIN(max.y, renderBuffer->height - 1);
|
||||
|
||||
const DqnV3 a = p1;
|
||||
const DqnV3 b = p2;
|
||||
const DqnV3 c = p3;
|
||||
|
||||
DqnV2i startP = min;
|
||||
f32 signedArea1 = ((b.x - a.x) * (startP.y - a.y)) - ((b.y - a.y) * (startP.x - a.x));
|
||||
f32 signedArea1DeltaX = a.y - b.y;
|
||||
f32 signedArea1DeltaY = b.x - a.x;
|
||||
|
||||
f32 signedArea2 = ((c.x - b.x) * (startP.y - b.y)) - ((c.y - b.y) * (startP.x - b.x));
|
||||
f32 signedArea2DeltaX = b.y - c.y;
|
||||
f32 signedArea2DeltaY = c.x - b.x;
|
||||
|
||||
f32 signedArea3 = ((a.x - c.x) * (startP.y - c.y)) - ((a.y - c.y) * (startP.x - c.x));
|
||||
f32 signedArea3DeltaX = c.y - a.y;
|
||||
f32 signedArea3DeltaY = a.x - c.x;
|
||||
|
||||
f32 signedAreaParallelogram = ((b.x - a.x) * (c.y - a.y) - (b.y - a.y) * (c.x - a.x));
|
||||
if (signedAreaParallelogram == 0) return;
|
||||
f32 invSignedAreaParallelogram = 1 / signedAreaParallelogram;
|
||||
|
||||
for (i32 bufferY = min.y; bufferY < max.y; bufferY++)
|
||||
{
|
||||
f32 signedArea1Row = signedArea1;
|
||||
f32 signedArea2Row = signedArea2;
|
||||
f32 signedArea3Row = signedArea3;
|
||||
|
||||
for (i32 bufferX = min.x; bufferX < max.x; bufferX++)
|
||||
{
|
||||
if (signedArea1Row >= 0 && signedArea2Row >= 0 && signedArea3Row >= 0)
|
||||
{
|
||||
f32 barycentricB = signedArea3Row * invSignedAreaParallelogram;
|
||||
f32 barycentricC = signedArea1Row * invSignedAreaParallelogram;
|
||||
|
||||
i32 zBufferIndex = bufferX + (bufferY * zBufferPitch);
|
||||
f32 pixelZValue =
|
||||
a.z + (barycentricB * (b.z - a.z)) + (barycentricC * (c.z - a.z));
|
||||
f32 currZValue = renderBuffer->zBuffer[zBufferIndex];
|
||||
DQN_ASSERT(zBufferIndex < (renderBuffer->width * renderBuffer->height));
|
||||
if (pixelZValue > currZValue)
|
||||
{
|
||||
renderBuffer->zBuffer[zBufferIndex] = pixelZValue;
|
||||
SetPixel(renderBuffer, bufferX, bufferY, color, ColorSpace_Linear);
|
||||
}
|
||||
}
|
||||
|
||||
signedArea1Row += signedArea1DeltaX;
|
||||
signedArea2Row += signedArea2DeltaX;
|
||||
signedArea3Row += signedArea3DeltaX;
|
||||
}
|
||||
|
||||
signedArea1 += signedArea1DeltaY;
|
||||
signedArea2 += signedArea2DeltaY;
|
||||
signedArea3 += signedArea3DeltaY;
|
||||
}
|
||||
}
|
||||
DTRDebug_EndCycleCount(DTRDebugCycleCount_RenderTriangle_Rasterise);
|
||||
|
||||
////////////////////////////////////////////////////////////////////////////
|
||||
// Debug
|
||||
@ -1289,6 +1484,15 @@ void DTRRender_Triangle(DTRRenderBuffer *const renderBuffer, DqnV3 p1, DqnV3 p2,
|
||||
DTRDebug_CounterIncrement(DTRDebugCounter_RenderTriangle);
|
||||
if (DTR_DEBUG_RENDER)
|
||||
{
|
||||
DqnV2i max =
|
||||
DqnV2i_2f(DQN_MAX(DQN_MAX(p1.x, p2.x), p3.x), DQN_MAX(DQN_MAX(p1.y, p2.y), p3.y));
|
||||
DqnV2i min =
|
||||
DqnV2i_2f(DQN_MIN(DQN_MIN(p1.x, p2.x), p3.x), DQN_MIN(DQN_MIN(p1.y, p2.y), p3.y));
|
||||
min.x = DQN_MAX(min.x, 0);
|
||||
min.y = DQN_MAX(min.y, 0);
|
||||
max.x = DQN_MIN(max.x, renderBuffer->width - 1);
|
||||
max.y = DQN_MIN(max.y, renderBuffer->height - 1);
|
||||
|
||||
// Draw Bounding box
|
||||
{
|
||||
DTRRender_Line(renderBuffer, DqnV2i_2i(min.x, min.y), DqnV2i_2i(min.x, max.y), color);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user