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graphicsdriver: Optimize shader (skip color matrix calculation)

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Skip multiplying with a color matrix when possible.
This commit is contained in:
Hajime Hoshi
2019-02-16 17:08:53 +09:00
parent 815ed8cda2
commit a8b97c9755
3 changed files with 127 additions and 93 deletions
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15
internal/graphicsdriver/opengl/shader.go
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@@ -61,7 +61,7 @@ func vertexShaderStr() string {
return src
}
func fragmentShaderStr(filter graphics.Filter, address graphics.Address) string {
func fragmentShaderStr(useColorM bool, filter graphics.Filter, address graphics.Address) string {
replaces := map[string]string{
"{{.AddressClampToZero}}": fmt.Sprintf("%d", graphics.AddressClampToZero),
"{{.AddressRepeat}}": fmt.Sprintf("%d", graphics.AddressRepeat),
@@ -72,6 +72,11 @@ func fragmentShaderStr(filter graphics.Filter, address graphics.Address) string
}
var defs []string
if useColorM {
defs = append(defs, "#define USE_COLOR_MATRIX")
}
switch filter {
case graphics.FilterNearest:
defs = append(defs, "#define FILTER_NEAREST")
@@ -82,6 +87,7 @@ func fragmentShaderStr(filter graphics.Filter, address graphics.Address) string
default:
panic(fmt.Sprintf("opengl: invalid filter: %d", filter))
}
switch address {
case graphics.AddressClampToZero:
defs = append(defs, "#define ADDRESS_CLAMP_TO_ZERO")
@@ -134,8 +140,11 @@ precision mediump float;
{{.Definitions}}
uniform sampler2D texture;
#if defined(USE_COLOR_MATRIX)
uniform mat4 color_matrix_body;
uniform vec4 color_matrix_translation;
#endif
uniform highp vec2 source_size;
@@ -250,8 +259,12 @@ void main(void) {
// Un-premultiply alpha.
// When the alpha is 0, 1.0 - sign(alpha) is 1.0, which means division does nothing.
color.rgb /= color.a + (1.0 - sign(color.a));
#if defined(USE_COLOR_MATRIX)
// Apply the color matrix or scale.
color = (color_matrix_body * color) + color_matrix_translation;
#endif
color *= varying_color_scale;
color = clamp(color, 0.0, 1.0);
// Premultiply alpha