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gpu,app,internal/glimpl: update GL backend for the compute renderer

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Modern graphics APIs have immutable objects, with mutable data. For example,
a texture's dimensions are immutable, while the texture contents is not.
Change the GPU API abstraction to match.

Clearing a Texture is convenient to do with a plain []byte. Generalize
Texture.Upload to take a plain byte slice and introduce a helper function for
uploading *image.RGBA data.

Add TextureFormatRGBA8 a format for the linear RGB colorspace.

Add OpenGL ES 3.1 functions for compute programs.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2020-12-30 16:48:22 +01:00
parent 7d24b790a2
commit bfe2d04c60
11 changed files with 400 additions and 89 deletions
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app/internal/srgb/srgb.go
+11 -11
View File
@@ -71,14 +71,14 @@ func (s *FBO) Blit() {
s.c.Uniform1i(s.c.GetUniformLocation(prog, "tex"), 0)
s.quad = s.c.CreateBuffer()
s.c.BindBuffer(glimpl.ARRAY_BUFFER, s.quad)
s.c.BufferData(glimpl.ARRAY_BUFFER,
unsafe.BytesView([]float32{
-1, +1, 0, 1,
+1, +1, 1, 1,
-1, -1, 0, 0,
+1, -1, 1, 0,
}),
glimpl.STATIC_DRAW)
coords := unsafe.BytesView([]float32{
-1, +1, 0, 1,
+1, +1, 1, 1,
-1, -1, 0, 0,
+1, -1, 1, 0,
})
s.c.BufferData(glimpl.ARRAY_BUFFER, len(coords), glimpl.STATIC_DRAW)
s.c.BufferSubData(glimpl.ARRAY_BUFFER, 0, coords)
s.blitted = true
}
s.c.BindFramebuffer(glimpl.FRAMEBUFFER, glimpl.Framebuffer{})
@@ -112,9 +112,9 @@ func (s *FBO) Refresh(w, h int) error {
}
s.c.BindTexture(glimpl.TEXTURE_2D, s.colorTex)
if s.gl3 {
s.c.TexImage2D(glimpl.TEXTURE_2D, 0, glimpl.SRGB8_ALPHA8, w, h, glimpl.RGBA, glimpl.UNSIGNED_BYTE, nil)
s.c.TexImage2D(glimpl.TEXTURE_2D, 0, glimpl.SRGB8_ALPHA8, w, h, glimpl.RGBA, glimpl.UNSIGNED_BYTE)
} else /* EXT_sRGB */ {
s.c.TexImage2D(glimpl.TEXTURE_2D, 0, glimpl.SRGB_ALPHA_EXT, w, h, glimpl.SRGB_ALPHA_EXT, glimpl.UNSIGNED_BYTE, nil)
s.c.TexImage2D(glimpl.TEXTURE_2D, 0, glimpl.SRGB_ALPHA_EXT, w, h, glimpl.SRGB_ALPHA_EXT, glimpl.UNSIGNED_BYTE)
}
currentRB := glimpl.Renderbuffer(s.c.GetBinding(glimpl.RENDERBUFFER_BINDING))
s.c.BindRenderbuffer(glimpl.RENDERBUFFER, s.depthBuffer)
@@ -136,7 +136,7 @@ func (s *FBO) Refresh(w, h int) error {
var pixel [4]byte
s.c.ReadPixels(0, 0, 1, 1, glimpl.RGBA, glimpl.UNSIGNED_BYTE, pixel[:])
if pixel[0] == 128 { // Correct sRGB color value is ~188
s.c.TexImage2D(glimpl.TEXTURE_2D, 0, glimpl.RGBA, w, h, glimpl.RGBA, glimpl.UNSIGNED_BYTE, nil)
s.c.TexImage2D(glimpl.TEXTURE_2D, 0, glimpl.RGBA, w, h, glimpl.RGBA, glimpl.UNSIGNED_BYTE)
if st := s.c.CheckFramebufferStatus(glimpl.FRAMEBUFFER); st != glimpl.FRAMEBUFFER_COMPLETE {
return fmt.Errorf("fallback RGBA framebuffer incomplete (%dx%d), status: %#x error: %x", s.width, s.height, st, s.c.GetError())
}