bool StGLStereoFrameBuffer::init(StGLContext& theCtx,
const GLsizei theTextureSizeX,
const GLsizei theTextureSizeY,
const bool theNeedDepthBuffer) {
// release current objects
release(theCtx);
if(theCtx.arbFbo == NULL) {
return false;
}
// create the textures
if(!StGLStereoTexture::initTrash(theCtx, theTextureSizeX, theTextureSizeY)) {
release(theCtx);
return false;
}
const GLuint aFboBakDraw = theCtx.stglFramebufferDraw();
const GLuint aFboBakRead = theCtx.stglFramebufferRead();
theCtx.stglBindFramebuffer(StGLFrameBuffer::NO_FRAMEBUFFER);
const GLint aDepthFormat = theCtx.isGlGreaterEqual(3, 0) ? GL_DEPTH24_STENCIL8 : GL_DEPTH_COMPONENT16;
if(theNeedDepthBuffer) {
theCtx.arbFbo->glGenRenderbuffers(2, myGLDepthRBIds);
theCtx.arbFbo->glBindRenderbuffer(GL_RENDERBUFFER, myGLDepthRBIds[StGLStereoTexture::LEFT_TEXTURE]);
theCtx.arbFbo->glRenderbufferStorage(GL_RENDERBUFFER, aDepthFormat, theTextureSizeX, theTextureSizeY);
}
// build FBOs
theCtx.arbFbo->glGenFramebuffers(2, myGLFBufferIds);
theCtx.stglBindFramebuffer(myGLFBufferIds[StGLStereoTexture::LEFT_TEXTURE]);
// bind left texture to left FBO as color buffer
theCtx.arbFbo->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
StGLStereoTexture::myTextures[StGLStereoTexture::LEFT_TEXTURE].getTextureId(), 0);
if(theNeedDepthBuffer) {
// bind left render buffer to left FBO as depth buffer
theCtx.arbFbo->glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER,
myGLDepthRBIds[StGLStereoTexture::LEFT_TEXTURE]);
}
bool isOk = theCtx.arbFbo->glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE;
theCtx.arbFbo->glBindRenderbuffer(GL_RENDERBUFFER, StGLFrameBuffer::NO_RENDERBUFFER);
if(!isOk) {
release(theCtx);
theCtx.stglBindFramebufferDraw(aFboBakDraw);
theCtx.stglBindFramebufferRead(aFboBakRead);
return false;
}
theCtx.stglBindFramebuffer(StGLFrameBuffer::NO_FRAMEBUFFER);
if(theNeedDepthBuffer) {
// create right RenderBuffer (will be used as depth buffer)
theCtx.arbFbo->glBindRenderbuffer(GL_RENDERBUFFER, myGLDepthRBIds[StGLStereoTexture::RIGHT_TEXTURE]);
theCtx.arbFbo->glRenderbufferStorage(GL_RENDERBUFFER, aDepthFormat, theTextureSizeX, theTextureSizeY);
}
theCtx.stglBindFramebuffer(myGLFBufferIds[StGLStereoTexture::RIGHT_TEXTURE]);
// bind right texture to rights FBO as color buffer
theCtx.arbFbo->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
StGLStereoTexture::myTextures[StGLStereoTexture::RIGHT_TEXTURE].getTextureId(), 0);
if(theNeedDepthBuffer) {
// bind right render buffer to right FBO as depth buffer
theCtx.arbFbo->glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER,
myGLDepthRBIds[StGLStereoTexture::RIGHT_TEXTURE]);
}
isOk = theCtx.arbFbo->glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE;
theCtx.arbFbo->glBindRenderbuffer(GL_RENDERBUFFER, StGLFrameBuffer::NO_RENDERBUFFER);
theCtx.stglBindFramebufferDraw(aFboBakDraw);
theCtx.stglBindFramebufferRead(aFboBakRead);
if(!isOk) {
release(theCtx);
return false;
}
ST_DEBUG_LOG("OpenGL, created StFrameBuffer(WxH= " + getSizeX() + 'x' + getSizeY() + ')');
// create vertices buffers to draw simple textured quad
StArray<StGLVec4> aQuad(4);
aQuad[0] = StGLVec4( 1.0f, -1.0f, 0.0f, 1.0f); // top-right
aQuad[1] = StGLVec4( 1.0f, 1.0f, 0.0f, 1.0f); // bottom-right
aQuad[2] = StGLVec4(-1.0f, -1.0f, 0.0f, 1.0f); // top-left
aQuad[3] = StGLVec4(-1.0f, 1.0f, 0.0f, 1.0f); // bottom-left
myVerticesBuf.init(theCtx, aQuad);
StArray<StGLVec2> aQuadTC(4);
aQuadTC[0] = StGLVec2(1.0f, 0.0f);
aQuadTC[1] = StGLVec2(1.0f, 1.0f);
aQuadTC[2] = StGLVec2(0.0f, 0.0f);
aQuadTC[3] = StGLVec2(0.0f, 1.0f);
myTexCoordBuf.init(theCtx, aQuadTC);
myViewPortX = theTextureSizeX;
myViewPortY = theTextureSizeY;
return true;
}
