+// Some GPUs use very inaccurate fixed-function circuits for rounding
+// floating-point values to 8-bit outputs, leading to absurdities like
+// the roundoff point between 128 and 129 being 128.62 instead of 128.5.
+// We test, for every integer, x+0.48 and x+0.52 and check that they
+// round the right way (giving some leeway, but not a lot); the number
+// of errors are stored here.
+//
+// If this value is above 0, we will round off explicitly at the very end
+// of the shader. Note the following limitations:
+//
+// - The measurement is done on linear 8-bit, not any sRGB format,
+// 10-bit output, or the likes.
+// - This only covers the final pass; intermediates are not covered
+// (only relevant if you use e.g. GL_SRGB8 intermediates).
+extern int movit_num_wrongly_rounded;
+
+// Whether the OpenGL driver (or GPU) in use supports GL_ARB_timer_query.
+extern bool movit_timer_queries_supported;
+
+// Whether the OpenGL driver (or GPU) in use supports compute shaders.
+// Note that certain OpenGL implementations might only allow this in core mode.
+extern bool movit_compute_shaders_supported;
+
+// What shader model we are compiling for. This only affects the choice
+// of a few files (like header.frag); most of the shaders are the same.
+enum MovitShaderModel {
+ MOVIT_GLSL_110, // No longer in use, but kept until next ABI break in order not to change the enums.
+ MOVIT_GLSL_130,
+ MOVIT_ESSL_300,
+ MOVIT_GLSL_150,
+};
+extern MovitShaderModel movit_shader_model;
+
+} // namespace movit