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lovr
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Font texture is u8; 

Originally we made the font texture f16 due to "clamping" of the
distance field, and kept it as floats (but f32 since conversion isn't
automatic with Vulkan) here.  However, clamping isn't really an issue.
You can increase the spread of the font to literally get a wider spread
of the SDF for glows, etc.  Switching to u8 uses 4x less texture memory,
which is significant.
This commit is contained in:
bjorn 2022-06-26 20:57:57 -07:00
parent bac57dc0d2
commit 9d84d3907b
1 changed files with 20 additions and 3 deletions
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23
src/modules/graphics/graphics.c
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@ -648,7 +648,7 @@ Font* lovrGraphicsGetDefaultFont() {
if (!state.defaultFont) {
state.defaultFont = lovrFontCreate(&(FontInfo) {
.rasterizer = lovrRasterizerCreate(NULL, 32),
.spread = 2.
.spread = 4.
});
}
@ -1895,7 +1895,7 @@ static void lovrFontUploadNewGlyphs(Font* font, uint32_t start, const char* str,
Texture* atlas = lovrTextureCreate(&(TextureInfo) {
.type = TEXTURE_2D,
.format = FORMAT_RGBA32F,
.format = FORMAT_RGBA8,
.width = font->atlasWidth,
.height = font->atlasHeight,
.depth = 1,
@ -1981,8 +1981,25 @@ static void lovrFontUploadNewGlyphs(Font* font, uint32_t start, const char* str,
uint32_t w = 2 * font->padding + ceilf(width);
uint32_t h = 2 * font->padding + ceilf(height);
void* pixels = gpu_map(scratchpad, w * h * 16, 16, GPU_MAP_WRITE);
uint32_t stack = tempPush();
float* pixels = tempAlloc(w * h * 4 * sizeof(float));
lovrRasterizerGetGlyphPixels(font->info.rasterizer, glyph->codepoint, pixels, w, h, font->info.spread);
uint8_t* dst = gpu_map(scratchpad, w * h * 4 * sizeof(uint8_t), 4, GPU_MAP_WRITE);
float* src = pixels;
for (uint32_t y = 0; y < h; y++) {
for (uint32_t x = 0; x < w; x++) {
for (uint32_t c = 0; c < 4; c++) {
float f = *src++; // CLAMP evaluates multiple times
*dst++ = (uint8_t) (CLAMP(f, 0.f, 1.f) * 255.f + .5f);
}
}
}
tempPop(stack);
uint32_t dstOffset[4] = { glyph->x - font->padding, glyph->y - font->padding, 0, 0 };
uint32_t extent[3] = { w, h, 1 };
gpu_copy_buffer_texture(state.stream, scratchpad, font->atlas->gpu, 0, dstOffset, extent);