- if (!finalized) {
- finalize_chain(color_space, gamma_curve, alpha_format);
- }
-
- chain.render_to_fbo(fbo, width, height);
-
- glBindFramebuffer(GL_FRAMEBUFFER, fbo);
- check_error();
- if (!epoxy_is_desktop_gl() && (format == GL_RED || format == GL_BLUE || format == GL_ALPHA)) {
- // GLES will only read GL_RGBA.
- float *temp = new float[width * height * 4];
- glReadPixels(0, 0, width, height, GL_RGBA, GL_FLOAT, temp);
- check_error();
- if (format == GL_ALPHA) {
- for (unsigned i = 0; i < width * height; ++i) {
- out_data[i] = temp[i * 4 + 3];
- }
- } else if (format == GL_BLUE) {
- for (unsigned i = 0; i < width * height; ++i) {
- out_data[i] = temp[i * 4 + 2];
- }
- } else {
- for (unsigned i = 0; i < width * height; ++i) {
- out_data[i] = temp[i * 4];
- }
- }
- delete[] temp;
- } else {
- glReadPixels(0, 0, width, height, format, GL_FLOAT, out_data);
- check_error();
- }
-
- if (format == GL_RGBA) {
- width *= 4;
- }
-
- vertical_flip(out_data, width, height);