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fix shader for Apple devices

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This commit is contained in:
omigamedev
2019-07-21 08:47:26 +02:00
parent 85d9c057f8
commit 97d9ca717a
3 changed files with 19 additions and 11 deletions
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22
data/shaders/stroke-dilate.glsl
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@@ -24,15 +24,21 @@ void main()
highp vec4 bg = texture(tex_bg, uv);
if (bg.a == 0.0)
{
highp ivec2 sz = textureSize(tex_bg, 0);
highp ivec2 uv_raster = ivec2(uv * vec2(sz));
highp vec4 sum = vec4(0.0);
for (int y = -1; y <= 1; y++)
{
for (int x = -1; x <= 1; x++)
{
highp vec4 c = textureOffset(tex_bg, uv, ivec2(x, y));
sum += vec4(c.rgb * c.a, c.a);
}
}
highp vec4 c;
c = texelFetch(tex_bg, uv_raster + ivec2(-1, -1), 0); sum += vec4(c.rgb * c.a, c.a);
c = texelFetch(tex_bg, uv_raster + ivec2(-1, 0), 0); sum += vec4(c.rgb * c.a, c.a);
c = texelFetch(tex_bg, uv_raster + ivec2(-1, 1), 0); sum += vec4(c.rgb * c.a, c.a);
c = texelFetch(tex_bg, uv_raster + ivec2( 0, -1), 0); sum += vec4(c.rgb * c.a, c.a);
c = texelFetch(tex_bg, uv_raster + ivec2( 0, 1), 0); sum += vec4(c.rgb * c.a, c.a);
c = texelFetch(tex_bg, uv_raster + ivec2( 1, -1), 0); sum += vec4(c.rgb * c.a, c.a);
c = texelFetch(tex_bg, uv_raster + ivec2( 1, 0), 0); sum += vec4(c.rgb * c.a, c.a);
c = texelFetch(tex_bg, uv_raster + ivec2( 1, 1), 0); sum += vec4(c.rgb * c.a, c.a);
frag = sum.a > 0.0 ? vec4(sum.rgb / sum.a, 0.0) : bg;
}
else