- glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, out_data);
+ check_error();
+ if (!epoxy_is_desktop_gl() && format == GL_RED) {
+ // GLES will only read GL_RGBA.
+ unsigned char *temp = new unsigned char[width * height * 4];
+ glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, temp);
+ check_error();
+ for (int i = 0; i < width * height; ++i) {
+ out_data[i] = temp[i * 4];
+ }
+ delete[] temp;
+ } else {
+ glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, out_data);
+ check_error();
+ }