aiden/video-shader-toys
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Aiden
2026-05-05 23:57:02 +10:00
parent 6ce09c0e9c
commit 7e4ab5cbd8
4 changed files with 50 additions and 11 deletions
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23
apps/LoopThroughWithOpenGLCompositing/OpenGLComposite.cpp
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@@ -205,6 +205,9 @@ std::vector<unsigned char> BuildLocalSdf(const std::vector<unsigned char>& alpha
const float distance = std::sqrt(static_cast<float>(bestDistanceSq));
const float signedDistance = (inside ? 1.0f : -1.0f) * distance;
float normalized = 0.5f + signedDistance / static_cast<float>(kTextSdfSpread * 2);
const unsigned char sourceAlpha = alpha[static_cast<std::size_t>(y) * width + x];
if (sourceAlpha > 0 && sourceAlpha < 255)
normalized = static_cast<float>(sourceAlpha) / 255.0f;
if (normalized < 0.0f)
normalized = 0.0f;
if (normalized > 1.0f)
@@ -220,6 +223,24 @@ std::vector<unsigned char> BuildLocalSdf(const std::vector<unsigned char>& alpha
return sdf;
}
std::vector<unsigned char> BuildTextCoverageTexture(const std::vector<unsigned char>& alpha, unsigned width, unsigned height)
{
std::vector<unsigned char> coverage(static_cast<std::size_t>(width) * height * 4, 0);
for (unsigned y = 0; y < height; ++y)
{
for (unsigned x = 0; x < width; ++x)
{
const unsigned char value = alpha[static_cast<std::size_t>(y) * width + x];
const std::size_t out = (static_cast<std::size_t>(y) * width + x) * 4;
coverage[out + 0] = value;
coverage[out + 1] = value;
coverage[out + 2] = value;
coverage[out + 3] = value;
}
}
return coverage;
}
std::vector<unsigned char> FlipTextTextureForShaderUv(const std::vector<unsigned char>& pixels, unsigned width, unsigned height)
{
std::vector<unsigned char> flipped(pixels.size(), 0);
@@ -414,7 +435,7 @@ bool RasterizeTextSdf(const std::string& text, const std::filesystem::path& font
alpha[static_cast<std::size_t>(y) * kTextTextureWidth + x] = static_cast<unsigned char>(luminance);
}
}
sdf = BuildLocalSdf(alpha, kTextTextureWidth, kTextTextureHeight);
sdf = BuildTextCoverageTexture(alpha, kTextTextureWidth, kTextTextureHeight);
sdf = BlurTextSdf(sdf, kTextTextureWidth, kTextTextureHeight, kTextSdfBlurPasses);
sdf = FlipTextTextureForShaderUv(sdf, kTextTextureWidth, kTextTextureHeight);
WriteTextMaskDebugDump(text, alpha, sdf, kTextTextureWidth, kTextTextureHeight);