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graphicsdriver/metal: Bug fix: Adjust texels

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Fixes #759
This commit is contained in:
Hajime Hoshi 2018-12-21 02:37:58 +09:00
parent d520749dcb
commit c227934153
1 changed files with 15 additions and 0 deletions
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15
internal/graphicsdriver/metal/driver.go
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@ -83,6 +83,19 @@ vertex VertexOut VertexShader(
return out;
}
// AdjustTexels adjust texels.
// See #669, #759
float2 AdjustTexel(float2 source_size, float2 p0, float2 p1) {
const float2 texel_size = 1.0 / source_size;
if (fract((p1.x-p0.x)*source_size.x) == 0.0) {
p1.x -= texel_size.x / 512.0;
}
if (fract((p1.y-p0.y)*source_size.y) == 0.0) {
p1.y -= texel_size.y / 512.0;
}
return p1;
}
fragment float4 FragmentShader(VertexOut v [[stage_in]],
texture2d<float> texture [[texture(0)]],
constant float4x4& color_matrix_body [[buffer(2)]],
@ -116,6 +129,7 @@ fragment float4 FragmentShader(VertexOut v [[stage_in]],
case FILTER_LINEAR: {
float2 p0 = v.tex - texel_size / 2.0;
float2 p1 = v.tex + texel_size / 2.0;
p1 = AdjustTexel(source_size, p0, p1);
float4 c0 = texture.sample(texture_sampler, p0);
float4 c1 = texture.sample(texture_sampler, float2(p1.x, p0.y));
@ -147,6 +161,7 @@ fragment float4 FragmentShader(VertexOut v [[stage_in]],
case FILTER_SCREEN: {
float2 p0 = v.tex - texel_size / 2.0 / scale;
float2 p1 = v.tex + texel_size / 2.0 / scale;
p1 = AdjustTexel(source_size, p0, p1);
float4 c0 = texture.sample(texture_sampler, p0);
float4 c1 = texture.sample(texture_sampler, float2(p1.x, p0.y));