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clean the usage of glCopyImageSubData and provide a fall back for 4.2)

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This commit is contained in:
samcake 2017-02-08 11:35:50 -08:00
parent a137659a35
commit 8a40e951ac
1 changed files with 28 additions and 26 deletions
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28
libraries/gpu-gl/src/gpu/gl45/GL45BackendTexture.cpp
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@ -438,7 +438,21 @@ void GL45Texture::stripToMip(uint16_t newMinMip) {
// Copy the contents of the old texture to the new
{
PROFILE_RANGE(render_gpu_gl, "Blit");
/*
// Preferred path only available in 4.3
if (GLEW_VERSION_4_3) {
for (uint16 targetMip = _minMip; targetMip <= _maxMip; ++targetMip) {
uint16 sourceMip = targetMip + mipDelta;
Vec3u mipDimensions = _gpuObject.evalMipDimensions(targetMip + _mipOffset);
for (GLenum target : getFaceTargets(_target)) {
glCopyImageSubData(
oldId, target, sourceMip, 0, 0, 0,
_id, target, targetMip, 0, 0, 0,
mipDimensions.x, mipDimensions.y, 1
);
(void)CHECK_GL_ERROR();
}
}
} else {
GLuint fbo { 0 };
glCreateFramebuffers(1, &fbo);
glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo);
@ -454,18 +468,6 @@ void GL45Texture::stripToMip(uint16_t newMinMip) {
}
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
glDeleteFramebuffers(1, &fbo);
*/
for (uint16 targetMip = _minMip; targetMip <= _maxMip; ++targetMip) {
uint16 sourceMip = targetMip + mipDelta;
Vec3u mipDimensions = _gpuObject.evalMipDimensions(targetMip + _mipOffset);
for (GLenum target : getFaceTargets(_target)) {
glCopyImageSubData(
oldId, target, sourceMip, 0, 0, 0,
_id, target, targetMip, 0, 0, 0,
mipDimensions.x, mipDimensions.y, 1
);
(void)CHECK_GL_ERROR();
}
}
glDeleteTextures(1, &oldId);