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Additional debug string rendering infrastructure

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Separate notion of rendering a static string, i.e. for debug display that
is absolutely positioned, and rendering of a regular string that moves
with the game camera.
This commit is contained in:
Doyle Thai
2016-07-12 18:11:31 +10:00
parent d82afe49d0
commit b1875077b7
6 changed files with 149 additions and 55 deletions
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src/Renderer.c
+51 -37
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@@ -18,50 +18,65 @@ INTERNAL void updateBufferObject(Renderer *const renderer,
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
void renderer_string(Renderer *const renderer, Font *const font,
const char *const string, v2 pos, f32 rotate,
v4 color)
void renderer_string(Renderer *const renderer, v4 cameraBounds,
Font *const font, const char *const string, v2 pos,
f32 rotate, v4 color)
{
i32 quadIndex = 0;
i32 strLen = common_strlen(string);
RenderQuad *stringQuads = PLATFORM_MEM_ALLOC(strLen, RenderQuad);
f32 baseline = pos.y;
for (i32 i = 0; i < strLen; i++)
i32 strLen = common_strlen(string);
// TODO(doyle): Slightly incorrect string length in pixels calculation,
// because we use the advance metric of each character for length not
// maximum character size in rendering
v2 rightAlignedP =
v2_add(pos, V2((CAST(f32) font->maxSize.w * CAST(f32) strLen),
CAST(f32) font->maxSize.h));
v2 leftAlignedP = pos;
if ((leftAlignedP.x < cameraBounds.z && rightAlignedP.x >= cameraBounds.x) &&
(leftAlignedP.y < cameraBounds.y && rightAlignedP.y >= cameraBounds.w))
{
// NOTE(doyle): Atlas packs fonts tightly, so offset the codepoint to
// its actual atlas index, i.e. we skip the first 31 glyphs
i32 codepoint = string[i];
i32 relativeIndex = codepoint - font->codepointRange.x;
CharMetrics charMetric = font->charMetrics[relativeIndex];
pos.y = baseline - charMetric.offset.y;
i32 quadIndex = 0;
RenderQuad *stringQuads = PLATFORM_MEM_ALLOC(strLen, RenderQuad);
const v4 charRectOnScreen = getRect(
pos, V2(CAST(f32) font->maxSize.w, CAST(f32) font->maxSize.h));
v2 offsetFromCamOrigin = V2(cameraBounds.x, cameraBounds.w);
v2 entityRelativeToCamera = v2_sub(pos, offsetFromCamOrigin);
pos.x += charMetric.advance;
/* Get texture out */
v4 charTexRect = font->atlas->texRect[relativeIndex];
renderer_flipTexCoord(&charTexRect, FALSE, TRUE);
pos = entityRelativeToCamera;
f32 baseline = pos.y;
for (i32 i = 0; i < strLen; i++)
{
// NOTE(doyle): Atlas packs fonts tightly, so offset the codepoint
// to
// its actual atlas index, i.e. we skip the first 31 glyphs
i32 codepoint = string[i];
i32 relativeIndex = codepoint - font->codepointRange.x;
CharMetrics charMetric = font->charMetrics[relativeIndex];
pos.y = baseline - charMetric.offset.y;
RenderQuad charQuad = renderer_createQuad(renderer, charRectOnScreen,
charTexRect, font->tex);
stringQuads[quadIndex++] = charQuad;
const v4 charRectOnScreen = getRect(
pos, V2(CAST(f32) font->maxSize.w, CAST(f32) font->maxSize.h));
pos.x += charMetric.advance;
/* Get texture out */
v4 charTexRect = font->atlas->texRect[relativeIndex];
renderer_flipTexCoord(&charTexRect, FALSE, TRUE);
RenderQuad charQuad = renderer_createQuad(
renderer, charRectOnScreen, charTexRect, font->tex);
stringQuads[quadIndex++] = charQuad;
}
// NOTE(doyle): We render at the renderer's size because we create quads
// relative to the window size, hence we also render at the origin since
// we're rendering a window sized buffer
updateBufferObject(renderer, stringQuads, quadIndex);
renderer_object(renderer, V2(0.0f, 0.0f), renderer->size, rotate, color,
font->tex);
PLATFORM_MEM_FREE(stringQuads, strLen * sizeof(RenderQuad));
}
// NOTE(doyle): We render at the renderer's size because we create quads
// relative to the window size, hence we also render at the origin since
// we're rendering a window sized buffer
updateBufferObject(renderer, stringQuads, quadIndex);
renderer_object(renderer, V2(0.0f, 0.0f), renderer->size, rotate, color,
font->tex);
PLATFORM_MEM_FREE(stringQuads, strLen * sizeof(RenderQuad));
}
void renderer_entity(Renderer *renderer, v4 cameraBounds, Entity *entity, f32 dt, f32 rotate,
v4 color)
void renderer_entity(Renderer *renderer, v4 cameraBounds, Entity *entity,
f32 dt, f32 rotate, v4 color)
{
// TODO(doyle): Batch into render groups
@@ -101,7 +116,6 @@ void renderer_entity(Renderer *renderer, v4 cameraBounds, Entity *entity, f32 dt
renderer_object(renderer, entityRelativeToCamera, entity->size, rotate,
color, entity->tex);
}
}
void renderer_object(Renderer *renderer, v2 pos, v2 size, f32 rotate, v4 color,