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let OpenGL handle sRGB conversion

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This commit is contained in:
Edgaru089 2022-02-21 14:13:24 +08:00
parent 5155008bf0
commit 4204a15b1e
4 changed files with 35 additions and 3 deletions
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2
internal/asset/shader/world/geometry.frag
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@ -23,6 +23,6 @@ void main() {
outputNormal.xyz = fragNormal;
outputNormal.w = fragPosLightspaceZ;
outputColor = texture(tex, fragTexCoord);
outputColor = vec4(pow(outputColor.rgb, vec3(gamma)), outputColor.a);
outputColor = vec4(outputColor.rgb, outputColor.a);
}

2
internal/asset/shader/world/water.frag
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@ -34,7 +34,7 @@ void lightPoint(int i);
void main() {
fragColor = vec4(pow(texture(tex, fragTexCoord).rgb, vec3(gamma)), 1.0f);
fragColor = vec4(texture(tex, fragTexCoord).rgb, 1.0f);
finalpha = alpha;
light = ambient;

3
internal/render/render_world.go
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@ -126,7 +126,8 @@ func (r *WorldRenderer) Init(w *world.World) (err error) {
gl.GetFloatv(gl.MAX_TEXTURE_MAX_ANISOTROPY, &maxaf)
asset.InitWorldTextureAtlas()
r.texture = NewTextureRGBA(asset.WorldTextureAtlas.Image)
r.texture = NewTexture()
r.texture.UpdatesRGB(asset.WorldTextureAtlas.Image)
r.texture.GenerateMipMap()
gl.BindTexture(gl.TEXTURE_2D, r.texture.Handle())
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAX_ANISOTROPY, maxaf)

31
internal/render/texture.go
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@ -127,6 +127,37 @@ func (t *Texture) UpdateRGBA(image *image.RGBA) {
t.updateFilters()
}
// UpdatesRGB updates the content of the texture with image in sRGB space.
// It deletes existing mipmap, you need to generate it again.
//
// The internal data is converted from sRGB to linear space by OpenGL:
//
// linear = sRGB/12.92 (if sRGB <= 0.04045)
// [(sRGB+0.055)/1.055]^2.4 (if sRGB > 0.04045)
//
// The Alpha component is not converted.
func (t *Texture) UpdatesRGB(image *image.RGBA) {
// Restore current texture binding
defer gl.BindTexture(gl.TEXTURE_2D, curTextureBinding())
gl.BindTexture(gl.TEXTURE_2D, t.tex)
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.SRGB_ALPHA,
int32(image.Rect.Size().X),
int32(image.Rect.Size().Y),
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(image.Pix),
)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
t.hasMipmap = false
t.updateFilters()
}
// GenerateMipMap generates mipmap for the texture.
func (t *Texture) GenerateMipMap() {