Add line rendering
This commit is contained in:
parent
0d5f4c6223
commit
d9ce1e1079
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@ -0,0 +1,29 @@
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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 15
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VisualStudioVersion = 15.0.26403.3
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{911E67C6-3D85-4FCE-B560-20A9C3E3FF48}") = "Win32DRenderer", "bin\Win32DRenderer.exe", "{6A9F3AE0-4D5E-4F89-8572-B868AC43C38A}"
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ProjectSection(DebuggerProjectSystem) = preProject
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PortSupplier = 00000000-0000-0000-0000-000000000000
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Executable = C:\git\drenderer\bin\Win32DRenderer.exe
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RemoteMachine = THAI-PC
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StartingDirectory = C:\git\drenderer\bin
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Environment = Default
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LaunchingEngine = 00000000-0000-0000-0000-000000000000
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UseLegacyDebugEngines = No
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LaunchSQLEngine = No
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AttachLaunchAction = No
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EndProjectSection
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Release|x64 = Release|x64
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{6A9F3AE0-4D5E-4F89-8572-B868AC43C38A}.Release|x64.ActiveCfg = Release|x64
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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EndGlobal
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@ -1,22 +1,132 @@
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#include "DRenderer.h"
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#include "DRendererPlatform.h"
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#define DQN_IMPLEMENTATION
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#include "dqn.h"
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#include <math.h>
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FILE_SCOPE void DR_DrawLine(PlatformRenderBuffer *const renderBuffer, DqnV2i a,
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DqnV2i b, DqnV3 color)
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{
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if (!renderBuffer) return;
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bool yTallerThanX = false;
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if (DQN_ABS(a.x - b.x) < DQN_ABS(a.y - b.y))
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{
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// NOTE(doyle): Enforce that the X component is always longer than the
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// Y component. When drawing this we just reverse the order back.
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// This is to ensure that the gradient is always < 1, such that we can
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// use the gradient to calculate the distance from the pixel origin, and
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// at which point we want to increment the y.
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yTallerThanX = true;
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DQN_SWAP(i32, a.x, a.y);
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DQN_SWAP(i32, b.x, b.y);
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}
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if (b.x < a.x) DQN_SWAP(DqnV2i, a, b);
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i32 rise = b.y - a.y;
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i32 run = b.x - a.x;
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i32 delta = (b.y > a.y) ? 1 : -1;
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i32 numIterations = b.x - a.x;
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i32 distFromPixelOrigin = DQN_ABS(rise) * 2;
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i32 distAccumulator = 0;
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i32 newX = a.x;
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i32 newY = a.y;
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// Unflip the points if we did for plotting the pixels
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i32 *plotX, *plotY;
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if (yTallerThanX)
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{
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plotX = &newY;
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plotY = &newX;
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}
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else
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{
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plotX = &newX;
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plotY = &newY;
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}
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const u32 pitchInU32 =
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(renderBuffer->width * renderBuffer->bytesPerPixel) / 4;
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u32 *const bitmapPtr = (u32 *)renderBuffer->memory;
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u32 pixel = ((i32)color.r << 16) | ((i32)color.g << 8) | ((i32)color.b << 0);
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for (i32 iterateX = 0; iterateX < numIterations; iterateX++)
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{
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newX = a.x + iterateX;
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bitmapPtr[*plotX + (*plotY * pitchInU32)] = pixel;
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distAccumulator += distFromPixelOrigin;
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if (distAccumulator > run)
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{
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newY += delta;
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distAccumulator -= (run * 2);
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}
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}
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}
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FILE_SCOPE void DR_DrawTriangle(PlatformRenderBuffer *const renderBuffer,
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DqnV2 p1, DqnV2 p2, DqnV2 p3, DqnV3 color)
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{
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DR_DrawLine(renderBuffer, p1, p2, color);
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DR_DrawLine(renderBuffer, p2, p3, color);
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DR_DrawLine(renderBuffer, p3, p1, color);
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// NOTE(doyle): This is just an desc sort using bubble sort on 3 elements
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if (p1.y < p2.y) DQN_SWAP(DqnV2i, p1, p2);
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if (p2.y < p3.y) DQN_SWAP(DqnV2i, p1, p3);
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if (p1.y < p2.y) DQN_SWAP(DqnV2i, p2, p3);
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i32 y1i = (i32)(p1.y + 0.5f);
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i32 y2i = (i32)(p2.y + 0.5f);
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i32 y3i = (i32)(p3.y + 0.5f);
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if (y1i == y3i) return; // Zero height triangle
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}
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FILE_SCOPE void DR_ClearRenderBuffer(PlatformRenderBuffer *const renderBuffer, DqnV3 color)
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{
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if (!renderBuffer) return;
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DQN_ASSERT(color.r >= 0.0f && color.r <= 255.0f);
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DQN_ASSERT(color.g >= 0.0f && color.g <= 255.0f);
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DQN_ASSERT(color.b >= 0.0f && color.b <= 255.0f);
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u32 *const bitmapPtr = (u32 *)renderBuffer->memory;
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for (i32 y = 0; y < renderBuffer->height; y++)
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{
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for (i32 x = 0; x < renderBuffer->width; x++)
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{
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u32 pixel = ((i32)color.r << 16) | ((i32)color.g << 8) |
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((i32)color.b << 0);
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bitmapPtr[x + (y * renderBuffer->width)] = pixel;
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}
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}
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}
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extern "C" void DR_Update(PlatformRenderBuffer *const renderBuffer,
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PlatformInput *const input,
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PlatformMemory *const memory)
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{
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u32 *bitmapPtr = (u32 *)renderBuffer->memory;
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for (i32 y = 0; y < renderBuffer->height; y++)
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{
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for (i32 x = 0; x < renderBuffer->width; x++)
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{
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u8 red = 255;
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u8 green = 0;
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u8 blue = 0;
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DR_ClearRenderBuffer(renderBuffer, DqnV3_3f(0, 0, 0));
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u32 color = (red << 16) | (green << 8) | (blue << 0);
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bitmapPtr[x + (y * renderBuffer->width)] = color;
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}
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}
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DqnV3 colorRed = DqnV3_3i(255, 0, 0);
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DqnV2i bufferMidP = DqnV2i_2f(renderBuffer->width * 0.5f, renderBuffer->height * 0.5f);
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i32 boundsOffset = 50;
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DqnV2 t0[3] = {DqnV2_2i(10, 70), DqnV2_2i(50, 160), DqnV2_2i(70, 80)};
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DqnV2 t1[3] = {DqnV2_2i(180, 50), DqnV2_2i(150, 1), DqnV2_2i(70, 180)};
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DqnV2 t2[3] = {DqnV2_2i(180, 150), DqnV2_2i(120, 160), DqnV2_2i(130, 180)};
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DqnV2 t3[3] = {
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DqnV2_2i(boundsOffset, boundsOffset),
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DqnV2_2i(bufferMidP.w, renderBuffer->height - boundsOffset),
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DqnV2_2i(renderBuffer->width - boundsOffset, boundsOffset)};
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DR_DrawTriangle(renderBuffer, t0[0], t0[1], t0[2], colorRed);
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// DR_DrawTriangle(renderBuffer, t1[0], t1[1], t1[2], colorRed);
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// DR_DrawTriangle(renderBuffer, t2[0], t2[1], t2[2], colorRed);
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// DR_DrawTriangle(renderBuffer, t3[0], t3[1], t3[2], colorRed);
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}
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@ -375,6 +375,7 @@ int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
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DqnWin32_DisplayLastError("CreateDIBSection() failed");
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return -1;
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}
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////////////////////////////////////////////////////////////////////////////
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// Make DLL Path
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////////////////////////////////////////////////////////////////////////////
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@ -393,7 +394,7 @@ int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
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numCopied =
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Dqn_sprintf(dllTmpPath, "%s%s", exeDir, "drenderer_temp.dll");
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DQN_ASSERT(numCopied < DQN_ARRAY_COUNT(dllPath));
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DQN_ASSERT(numCopied < DQN_ARRAY_COUNT(dllTmpPath));
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}
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////////////////////////////////////////////////////////////////////////////
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@ -39,7 +39,12 @@ REM wd4505 unreferenced local function not used will be removed
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set CompileFlags=-EHa- -GR- -Oi -MT -Z7 -W4 -wd4100 -wd4201 -wd4189 -wd4505 -Od -FAsc
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set DLLFlags=/Fm%ProjectName% /Fo%ProjectName% /Fa%ProjectName% /Fe%ProjectName%
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set Win32Flags=/FmWin32DRenderer /FeWin32DRenderer
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set TimeStamp=%date:~10,4%%date:~7,2%%date:~4,2%_%time:~0,2%%time:~3,2%%time:~6,2%
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REM Clean time necessary for hours <10, which produces H:MM:SS.SS where the
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REM first character of time is an empty space. CleanTime will pad a 0 if
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REM necessary.
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set CleanTime=%time: =0%
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set TimeStamp=%date:~10,4%%date:~7,2%%date:~4,2%_%CleanTime:~0,2%%CleanTime:~3,2%%CleanTime:~6,2%
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REM Link libraries
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set LinkLibraries=user32.lib kernel32.lib gdi32.lib
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@ -48,14 +48,14 @@ typedef float f32;
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#define DQN_ASSERT(expr) if (!(expr)) { (*((i32 *)0)) = 0; }
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#define DQN_PI 3.14159265359f
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#define DQN_SQUARED(x) ((x) * (x))
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#define DQN_ABS(x) (((x) < 0) ? (-(x)) : (x))
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#define DQN_DEGREES_TO_RADIANS(x) ((x * (DQN_PI / 180.0f)))
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#define DQN_RADIANS_TO_DEGREES(x) ((x * (180.0f / DQN_PI)))
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#define DQN_MAX(a, b) ((a) < (b) ? (b) : (a))
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#define DQN_MIN(a, b) ((a) < (b) ? (a) : (b))
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#define DQN_SQUARED(x) ((x) * (x))
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#define DQN_SWAP(type, a, b) do { type tmp = a; a = b; b = tmp; } while(0)
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////////////////////////////////////////////////////////////////////////////////
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// DqnMem - Memory
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////////////////////////////////////////////////////////////////////////////////
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