Add support for compute shaders.

[movit] / init.h

diff --git a/init.h b/init.h
index 89e3ef70c6b538494b218339995e891b0aa712ce..23055227a41fde49b91aed18fcb613e80c864428 100644 (file)
--- a/init.h
+++ b/init.h
@@ -50,30 +50,31 @@ extern float movit_texel_subpixel_precision;
 
 // 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 128.6.
+// 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, the extension GL_EXT_gpu_shader4 is available
-// (giving round()) and you have enabled dithering, we will round off
-// explicitly at the very end of the shader.
+// If this value is above 0, we will round off explicitly at the very end
+// of the shader. Note the following limitations:
 //
-// Note: I don't know of any cards that round off wrong (well, outside
-// our tolerance) and do not have this extension.
+//   - 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;
-extern bool movit_shader_rounding_supported;
-
-// Whether the GPU in use supports GL_EXT_texture_sRGB.
-extern bool movit_srgb_textures_supported;
 
 // 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_130_AS_110,  // Use 1.30 features freely, but use #version 110.
+       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,