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marco-we/gist:ee9e5ccea948814364ff

Created January 12, 2016 13:39
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pbo_readpixels
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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);
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