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gpu,gpu/internal,internal/gl: replace BlitFramebuffer with CopyTexture

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OpenGL ES 2.0 doesn't support glBlitFramebuffer, but does support
glCopyTexSubImage2D. Fortunately, we don't need the extra features of
glBlitFramebuffer anyway.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-08-21 11:11:38 +02:00
parent 44adf01768
commit c9970cb8e3
8 changed files with 32 additions and 20 deletions
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internal/gl/gl_windows.go
+4 -3
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@@ -34,6 +34,7 @@ var (
_glDeleteQueries = LibGLESv2.NewProc("glDeleteQueries")
_glDeleteVertexArrays = LibGLESv2.NewProc("glDeleteVertexArrays")
_glCompileShader = LibGLESv2.NewProc("glCompileShader")
_glCopyTexSubImage2D = LibGLESv2.NewProc("glCopyTexSubImage2D")
_glGenBuffers = LibGLESv2.NewProc("glGenBuffers")
_glGenFramebuffers = LibGLESv2.NewProc("glGenFramebuffers")
_glGenVertexArrays = LibGLESv2.NewProc("glGenVertexArrays")
@@ -158,9 +159,6 @@ func (c *Functions) BlendEquation(mode Enum) {
func (c *Functions) BlendFuncSeparate(srcRGB, dstRGB, srcA, dstA Enum) {
syscall.Syscall6(_glBlendFuncSeparate.Addr(), 4, uintptr(srcRGB), uintptr(dstRGB), uintptr(srcA), uintptr(dstA), 0, 0)
}
func (f *Functions) BlitFramebuffer(sx0, sy0, sx1, sy1, dx0, dy0, dx1, dy1 int, mask Enum, filter Enum) {
panic("not implemented")
}
func (c *Functions) BufferData(target Enum, size int, usage Enum) {
syscall.Syscall6(_glBufferData.Addr(), 4, uintptr(target), uintptr(size), 0, uintptr(usage), 0, 0)
}
@@ -187,6 +185,9 @@ func (c *Functions) ClearDepthf(d float32) {
func (c *Functions) CompileShader(s Shader) {
syscall.Syscall(_glCompileShader.Addr(), 1, uintptr(s.V), 0, 0)
}
func (f *Functions) CopyTexSubImage2D(target Enum, level, xoffset, yoffset, x, y, width, height int) {
syscall.Syscall9(_glCopyTexSubImage2D.Addr(), 8, uintptr(target), uintptr(level), uintptr(xoffset), uintptr(yoffset), uintptr(x), uintptr(y), uintptr(width), uintptr(height), 0)
}
func (c *Functions) CreateBuffer() Buffer {
var buf uintptr
syscall.Syscall(_glGenBuffers.Addr(), 2, 1, uintptr(unsafe.Pointer(&buf)), 0)