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Tweak OpenGL framebuffer

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Force alignment for GL ReadPixels and skip unbinding last framebuffer which makes it a bit faster.
This commit is contained in:
sergystepanov 2025-12-26 16:17:37 +03:00
parent aeb41008c9
commit 8754a5edfa
2 changed files with 13 additions and 2 deletions
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11
pkg/worker/caged/libretro/graphics/gl/gl.go
View file

@ -78,6 +78,7 @@ typedef void (APIENTRYP GPREADPIXELS)(GLint x, GLint y, GLsizei width, GLsizei h
typedef void (APIENTRYP GPRENDERBUFFERSTORAGE)(GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
typedef void (APIENTRYP GPTEXIMAGE2D)(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void *pixels);
typedef void (APIENTRYP GPTEXPARAMETERI)(GLenum target, GLenum pname, GLint param);
typedef void (APIENTRYP GPPIXELSTOREI)(GLenum pname, GLint param);
static const GLubyte *getString(GPGETSTRING ptr, GLenum name) { return (*ptr)(name); }
static GLenum getError(GPGETERROR ptr) { return (*ptr)(); }
@ -113,6 +114,7 @@ static void deleteTextures(GPDELETETEXTURES ptr, GLsizei n, const GLuint *textur
static void readPixels(GPREADPIXELS ptr, GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void *pixels) {
(*ptr)(x, y, width, height, format, type, pixels);
}
static void pixelStorei(GPPIXELSTOREI ptr, GLenum pname, GLint param) { (*ptr)(pname, param); }
*/
import "C"
import (
@ -144,6 +146,8 @@ const (
UnsignedShort5551 = 0x8034
UnsignedShort565 = 0x8363
UnsignedInt8888Rev = 0x8367
PackAlignment = 0x0D05
)
var (
@ -165,6 +169,7 @@ var (
gpDeleteFramebuffers C.GPDELETEFRAMEBUFFERS
gpDeleteTextures C.GPDELETETEXTURES
gpReadPixels C.GPREADPIXELS
gpPixelStorei C.GPPIXELSTOREI
)
func InitWithProcAddrFunc(getProcAddr func(name string) unsafe.Pointer) error {
@ -205,6 +210,9 @@ func InitWithProcAddrFunc(getProcAddr func(name string) unsafe.Pointer) error {
if gpReadPixels == nil {
return errors.New("glReadPixels")
}
if gpPixelStorei = (C.GPPIXELSTOREI)(getProcAddr("glPixelStorei")); gpPixelStorei == nil {
return errors.New("glPixelStorei")
}
return nil
}
@ -257,6 +265,9 @@ func DeleteTextures(n int32, textures *uint32) {
func ReadPixels(x int32, y int32, width int32, height int32, format uint32, xtype uint32, pixels unsafe.Pointer) {
C.readPixels(gpReadPixels, (C.GLint)(x), (C.GLint)(y), (C.GLsizei)(width), (C.GLsizei)(height), (C.GLenum)(format), (C.GLenum)(xtype), pixels)
}
func PixelStorei(pname uint32, param int32) {
C.pixelStorei(gpPixelStorei, (C.GLenum)(pname), (C.GLint)(param))
}
func GetError() uint32 { return (uint32)(C.getError(gpGetError)) }

4
pkg/worker/caged/libretro/graphics/opengl.go
View file

@ -110,10 +110,10 @@ func destroyFramebuffer() {
}
func ReadFramebuffer(bytes, w, h uint) []byte {
data := buf[:bytes]
data := buf[:bytes:bytes]
gl.PixelStorei(gl.PackAlignment, 1)
gl.BindFramebuffer(gl.FRAMEBUFFER, opt.fbo)
gl.ReadPixels(0, 0, int32(w), int32(h), opt.pixType, opt.pixFormat, unsafe.Pointer(&data[0]))
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
return data
}