Lothario
/
axmol
mirror of https://github.com/axmolengine/axmol.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

closed #3964, Use GL methods instead in function RenderTexture::newImage()

This commit is contained in:
zhangbin 2014-02-18 10:47:14 +08:00
parent e02f488224
commit 650331769a
1 changed files with 15 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
cocos/2d/CCRenderTexture.cpp
View File

@ -446,10 +446,23 @@ Image* RenderTexture::newImage(bool fliimage)
break;
}
this->onBegin();
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &_oldFBO);
glBindFramebuffer(GL_FRAMEBUFFER, _FBO);
//TODO move this to configration, so we don't check it every time
/* Certain Qualcomm Andreno gpu's will retain data in memory after a frame buffer switch which corrupts the render to the texture. The solution is to clear the frame buffer before rendering to the texture. However, calling glClear has the unintended result of clearing the current texture. Create a temporary texture to overcome this. At the end of RenderTexture::begin(), switch the attached texture to the second one, call glClear, and then switch back to the original texture. This solution is unnecessary for other devices as they don't have the same issue with switching frame buffers.
*/
if (Configuration::getInstance()->checkForGLExtension("GL_QCOM"))
{
// -- bind a temporary texture so we can clear the render buffer without losing our texture
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, _textureCopy->getName(), 0);
CHECK_GL_ERROR_DEBUG();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, _texture->getName(), 0);
}
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(0,0,savedBufferWidth, savedBufferHeight,GL_RGBA,GL_UNSIGNED_BYTE, tempData);
this->onEnd();
glBindFramebuffer(GL_FRAMEBUFFER, _oldFBO);
if ( fliimage ) // -- flip is only required when saving image to file
{