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gl_engine: fix aliasing in gradient rendering

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RuiwenTang 2024-07-05 18:10:05 +08:00 • committed by Hermet Park
parent 423e37d4d5
commit 8d6b1d6da3
1 changed files with 29 additions and 7 deletions
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36
src/renderer/gl_engine/tvgGlShaderSrc.cpp
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@ -118,8 +118,9 @@ float gradientWrap(float d)
} \n } \n
} \n } \n
\n \n
vec4 gradient(float t) \n vec4 gradient(float t, float d, float l) \n
{ \n { \n
float dist = d * 2.0 / l; \n
vec4 col = vec4(0.0); \n vec4 col = vec4(0.0); \n
int i = 0; \n int i = 0; \n
int count = int(uGradientInfo.nStops[0]); \n int count = int(uGradientInfo.nStops[0]); \n
@ -130,6 +131,12 @@ vec4 gradient(float t)
else if (t >= gradientStop(count - 1)) \n else if (t >= gradientStop(count - 1)) \n
{ \n { \n
col = uGradientInfo.stopColors[count - 1]; \n col = uGradientInfo.stopColors[count - 1]; \n
if (int(uGradientInfo.nStops[2]) == 2 && (1.0 - t) < dist) { \n
float dd = (1.0 - t) / dist; \n
float alpha = dd; \n
col *= alpha; \n
col += uGradientInfo.stopColors[0] * (1. - alpha);\n
} \n
} \n } \n
else \n else \n
{ \n { \n
@ -141,6 +148,21 @@ vec4 gradient(float t)
{ \n { \n
col = (uGradientInfo.stopColors[i] * (1. - gradientStep(stopi, stopi1, t))); \n col = (uGradientInfo.stopColors[i] * (1. - gradientStep(stopi, stopi1, t))); \n
col += (uGradientInfo.stopColors[i + 1] * gradientStep(stopi, stopi1, t)); \n col += (uGradientInfo.stopColors[i + 1] * gradientStep(stopi, stopi1, t)); \n
if (int(uGradientInfo.nStops[2]) == 2 && abs(d) > dist) { \n
if (i == 0 && (t - stopi) < dist) { \n
float dd = (t - stopi) / dist; \n
float alpha = dd; \n
col *= alpha; \n
vec4 nc = uGradientInfo.stopColors[0] * (1.0 - (t - stopi)); \n
nc += uGradientInfo.stopColors[count - 1] * (t - stopi); \n
col += nc * (1.0 - alpha); \n
} else if (i == count - 2 && (1.0 - t) < dist) { \n
float dd = (1.0 - t) / dist; \n
float alpha = dd; \n
col *= alpha; \n
col += (uGradientInfo.stopColors[0]) * (1.0 - alpha); \n
} \n
} \n
break; \n break; \n
} \n } \n
} \n } \n
@ -176,11 +198,11 @@ void main()
\n \n
vec2 ba = ed - st; \n vec2 ba = ed - st; \n
\n \n
float t = abs(dot(pos - st, ba) / dot(ba, ba)); \n float d = abs(dot(pos - st, ba) / dot(ba, ba)); \n
\n \n
t = gradientWrap(t); \n float t = gradientWrap(d); \n
\n \n
vec4 color = gradient(t); \n vec4 color = gradient(t, d, length(pos - st)); \n
\n \n
FragColor = vec4(color.rgb * color.a, color.a); \n FragColor = vec4(color.rgb * color.a, color.a); \n
}); });
@ -203,11 +225,11 @@ void main()
\n \n
float ba = uGradientInfo.radius.x; \n float ba = uGradientInfo.radius.x; \n
float d = distance(uGradientInfo.centerPos, pos); \n float d = distance(uGradientInfo.centerPos, pos); \n
d = (d / ba); \n float t = (d / ba); \n
\n \n
float t = gradientWrap(d); \n t = gradientWrap(t); \n
\n \n
vec4 color = gradient(t); \n vec4 color = gradient(t, (d / ba), d); \n
\n \n
FragColor = vec4(color.rgb * color.a, color.a); \n FragColor = vec4(color.rgb * color.a, color.a); \n
}); });