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shaders: fixup jagged edges in texture rounded corners

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Vaxry 2024-11-05 16:00:39 +00:00
parent d1638a09ba
commit 55ccb1a8cf
1 changed files with 7 additions and 4 deletions
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11
src/render/shaders/Textures.hpp
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@ -5,24 +5,27 @@
inline static constexpr auto ROUNDED_SHADER_FUNC = [](const std::string colorVarName) -> std::string { inline static constexpr auto ROUNDED_SHADER_FUNC = [](const std::string colorVarName) -> std::string {
return R"#( return R"#(
// branchless baby! // shoutout me: I fixed this shader being a bit pixelated while watching hentai
highp vec2 pixCoord = vec2(gl_FragCoord); highp vec2 pixCoord = vec2(gl_FragCoord);
pixCoord -= topLeft + fullSize * 0.5; pixCoord -= topLeft + fullSize * 0.5;
pixCoord *= vec2(lessThan(pixCoord, vec2(0.0))) * -2.0 + 1.0; pixCoord *= vec2(lessThan(pixCoord, vec2(0.0))) * -2.0 + 1.0;
pixCoord -= fullSize * 0.5 - radius; pixCoord -= fullSize * 0.5 - radius;
pixCoord += vec2(1.0, 1.0) / fullSize; // center the pix dont make it top-left pixCoord += vec2(1.0, 1.0) / fullSize; // center the pix dont make it top-left
const float SMOOTHING_CONSTANT = 0.651724; // smoothing constant for the edge: more = blurrier, but smoother
if (pixCoord.x + pixCoord.y > radius) { if (pixCoord.x + pixCoord.y > radius) {
float dist = length(pixCoord); float dist = length(pixCoord);
if (dist > radius) if (dist > radius + SMOOTHING_CONSTANT * 2.0)
discard; discard;
if (dist > radius - 1.0) { if (dist > radius - SMOOTHING_CONSTANT * 2.0) {
float dist = length(pixCoord); float dist = length(pixCoord);
float normalized = 1.0 - smoothstep(0.0, 1.0, dist - radius + 0.5); float normalized = 1.0 - smoothstep(0.0, 1.0, (dist - radius + SMOOTHING_CONSTANT) / (SMOOTHING_CONSTANT * 2.0));
)#" + )#" +
colorVarName + R"#( = )#" + colorVarName + R"#( * normalized; colorVarName + R"#( = )#" + colorVarName + R"#( * normalized;