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Implement depth buffer copy to correctly emulate LoT in Zelda MM.

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OpenGL depth and color buffers have different format, so
direct copy is impossible. Thus, special function for that special case
has been implemented.
This commit is contained in:
Sergey Lipskiy 2014-01-08 23:25:45 +07:00
parent 066ebc8b47
commit 467cc44185
1 changed files with 41 additions and 0 deletions
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41
gSP.cpp
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@ -1444,6 +1444,37 @@ void gSPLineW3D( s32 v0, s32 v1, s32 wd, s32 flag )
#endif
}
static
void _copyDepthBuffer()
{
if (!OGL.frameBufferTextures)
return;
// The game copies content of depth buffer into current color buffer
// OpenGL has different format for color and depth buffers, so this trick can't be performed directly
// To do that, depth buffer with address of current color buffer created and attached to the current FBO
// It will be copy depth buffer
DepthBuffer_SetBuffer(gDP.colorImage.address);
// Take any frame buffer and attach source depth buffer to it, to blit it into copy depth buffer
FrameBuffer * pTmpBuffer = frameBuffer.top->lower;
DepthBuffer * pTmpBufferDepth = pTmpBuffer->pDepthBuffer;
pTmpBuffer->pDepthBuffer = DepthBuffer_FindBuffer(gSP.bgImage.address);
ogl_glBindFramebuffer(GL_READ_FRAMEBUFFER, pTmpBuffer->fbo);
ogl_glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, pTmpBuffer->pDepthBuffer->renderbuf);
GLuint attachments[2] = { GL_COLOR_ATTACHMENT0, GL_DEPTH_ATTACHMENT };
ogl_glDrawBuffers(2, attachments, pTmpBuffer->texture->glName);
ogl_glBindFramebuffer(GL_DRAW_FRAMEBUFFER, frameBuffer.top->fbo);
ogl_glBlitFramebuffer(
0, 0, OGL.width, OGL.height,
0, 0, OGL.width, OGL.height,
GL_DEPTH_BUFFER_BIT, GL_NEAREST
);
// Restore objects
ogl_glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, pTmpBufferDepth->renderbuf);
ogl_glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
// Set back current depth buffer
DepthBuffer_SetBuffer(gDP.depthImageAddress);
}
static
void loadBGImage(const uObjScaleBg * _bgInfo, bool _loadScale)
{
@ -1483,6 +1514,11 @@ void gSPBgRect1Cyc( u32 bg )
uObjScaleBg *objScaleBg = (uObjScaleBg*)&RDRAM[address];
loadBGImage(objScaleBg, true);
if (gSP.bgImage.address == gDP.depthImageAddress || DepthBuffer_FindBuffer(gSP.bgImage.address) != NULL) {
_copyDepthBuffer();
return;
}
f32 imageX = gSP.bgImage.imageX;
f32 imageY = gSP.bgImage.imageY;
f32 imageW = _FIXED2FLOAT( objScaleBg->imageW, 2);
@ -1561,6 +1597,11 @@ void gSPBgRectCopy( u32 bg )
uObjScaleBg *objBg = (uObjScaleBg*)&RDRAM[address];
loadBGImage(objBg, false);
if (gSP.bgImage.address == gDP.depthImageAddress || DepthBuffer_FindBuffer(gSP.bgImage.address) != NULL) {
_copyDepthBuffer();
return;
}
f32 frameX = objBg->frameX / 4.0f;
f32 frameY = objBg->frameY / 4.0f;
u16 frameW = objBg->frameW >> 2;