pbo_readpixels

gistfile1.txt

const uint32_t width  = frameBuffer.m_width;
const uint32_t height = frameBuffer.m_height;
const uint32_t length = width*height*4;
	
GLuint pboId;
GL_CHECK(glGenBuffers(1, &pboId) );
GL_CHECK(glBindBuffer(GL_PIXEL_PACK_BUFFER, pboId) );
GL_CHECK(glBufferData(GL_PIXEL_PACK_BUFFER, length, 0, GL_STREAM_READ) );

GL_CHECK(glBindFramebuffer(GL_FRAMEBUFFER, frameBuffer.m_fbo[0]) );
GL_CHECK(glReadBuffer(GL_COLOR_ATTACHMENT0) );

GL_CHECK(glReadPixels(0, 0, width, height, m_readPixelsFmt, GL_UNSIGNED_BYTE, 0) );

GLubyte* src = (GLubyte*)glMapBuffer(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY);
if (src)
{
	g_callback->screenShot(NULL, width, height, width*4, src, length, true);
	glUnmapBuffer(GL_PIXEL_PACK_BUFFER);
}
	
glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
glDeleteBuffers(1, &pboId);