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Improved string rendering with text advance metric

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This commit is contained in:
Doyle Thai
2016-06-30 00:14:07 +10:00
parent d8ee46611f
commit 5ef54e16be
4 changed files with 100 additions and 24 deletions
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src/WorldTraveller.c
+25 -9
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@@ -343,26 +343,42 @@ void worldTraveller_gameUpdateAndRender(GameState *state, const f32 dt)
V3(0, 0, 0), worldTex);
Font *font = &assetManager->font;
char *string = "hello world";
i32 strLen = 11;
char *string = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
i32 strLen = 52;
quadIndex = 0;
RenderQuad *stringQuads = CAST(RenderQuad *)calloc(strLen, sizeof(RenderQuad));
f32 baseline = 100.0f;
f32 xPosOnScreen = 20.0f;
f32 yPosOnScreen = baseline;
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 atlasIndex = string[i] - font->codepointRange.x;
i32 codepoint = string[i];
i32 relativeIndex = codepoint - font->codepointRange.x;
CharMetrics charMetric = font->charMetrics[relativeIndex];
v4 charTexRect = font->atlas->texRect[atlasIndex];
i32 charBaseline = (font->maxSize.h - charMetric.trueSize.h);
if (codepoint == 'a')
{
yPosOnScreen = baseline - charBaseline;
}
else
{
yPosOnScreen = baseline;
}
const v4 charRectOnScreen = getRect(
V2(xPosOnScreen, yPosOnScreen),
V2(CAST(f32) font->maxSize.w, CAST(f32) font->maxSize.h));
xPosOnScreen += charMetric.advance;
/* Get texture out */
v4 charTexRect = font->atlas->texRect[relativeIndex];
renderer_flipTexCoord(&charTexRect, FALSE, TRUE);
const v4 charRectOnScreen =
getRect(V2(xPosOnScreen, 100.0f),
V2(CAST(f32) font->charSize.w, CAST(f32) font->charSize.w));
xPosOnScreen += font->charSize.w;
RenderQuad charQuad = renderer_createQuad(
&state->renderer, charRectOnScreen, charTexRect, font->tex);
stringQuads[quadIndex++] = charQuad;