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Implement a glCopyImageSubData() workaround for OpenGL ES 3.1 

This implementation uses glBlitFramebuffer().

Bug: dawn:638

Change-Id: I4ff62967c815a7e4b04348930539b27bddf44580
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/38145
Commit-Queue: Stephen White <senorblanco@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
This commit is contained in:
Stephen White 2021-01-20 17:27:27 +00:00 committed by Commit Bot service account
parent 064f33e441
commit 55af59b47f
1 changed files with 44 additions and 5 deletions
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49
src/dawn_native/opengl/CommandBufferGL.cpp
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@ -780,11 +780,50 @@ namespace dawn_native { namespace opengl {
} else {
dstTexture->EnsureSubresourceContentInitialized(dstRange);
}
gl.CopyImageSubData(srcTexture->GetHandle(), srcTexture->GetGLTarget(),
src.mipLevel, src.origin.x, src.origin.y, src.origin.z,
dstTexture->GetHandle(), dstTexture->GetGLTarget(),
dst.mipLevel, dst.origin.x, dst.origin.y, dst.origin.z,
copySize.width, copySize.height, copy->copySize.depth);
if (gl.IsAtLeastGL(4, 3) || gl.IsAtLeastGLES(3, 2)) {
gl.CopyImageSubData(srcTexture->GetHandle(), srcTexture->GetGLTarget(),
src.mipLevel, src.origin.x, src.origin.y, src.origin.z,
dstTexture->GetHandle(), dstTexture->GetGLTarget(),
dst.mipLevel, dst.origin.x, dst.origin.y, dst.origin.z,
copySize.width, copySize.height, copy->copySize.depth);
} else {
GLuint readFBO = 0, drawFBO = 0;
gl.GenFramebuffers(1, &readFBO);
gl.GenFramebuffers(1, &drawFBO);
gl.BindFramebuffer(GL_READ_FRAMEBUFFER, readFBO);
gl.BindFramebuffer(GL_DRAW_FRAMEBUFFER, drawFBO);
gl.Disable(GL_SCISSOR_TEST);
for (uint32_t layer = 0; layer < copy->copySize.depth; ++layer) {
if (srcTexture->GetArrayLayers() == 1) {
gl.FramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
srcTexture->GetGLTarget(),
srcTexture->GetHandle(), src.mipLevel);
} else {
gl.FramebufferTextureLayer(
GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
srcTexture->GetHandle(), static_cast<GLint>(src.mipLevel),
static_cast<GLint>(src.origin.z + layer));
}
if (dstTexture->GetArrayLayers() == 1) {
gl.FramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
dstTexture->GetGLTarget(),
dstTexture->GetHandle(), dst.mipLevel);
} else {
gl.FramebufferTextureLayer(
GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
dstTexture->GetHandle(), static_cast<GLint>(dst.mipLevel),
static_cast<GLint>(dst.origin.z + layer));
}
gl.BlitFramebuffer(
src.origin.x, src.origin.y, src.origin.x + copySize.width,
src.origin.y + copySize.height, dst.origin.x, dst.origin.y,
dst.origin.x + copySize.width, dst.origin.y + copySize.height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
}
gl.Enable(GL_SCISSOR_TEST);
gl.DeleteFramebuffers(1, &readFBO);
gl.DeleteFramebuffers(1, &drawFBO);
}
break;
}