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gl-renderer: define fragment shader compile_const

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Compile time constants play an important role in keeping the shader
programs fast. Introduce an informal annotation to mark compile time
constants to make the shader code easier to reason with.

This will make much more sense once functions with compile time constant
parameters are added.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen 2021-03-15 14:02:50 +02:00
parent 734c2278f9
commit 37fe6fde49
1 changed files with 5 additions and 2 deletions
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7
libweston/renderer-gl/fragment.glsl
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@ -27,6 +27,9 @@
/* GLSL version 1.00 ES, defined in gl-shaders.c */
/* For annotating shader compile-time constant arguments */
#define compile_const const
/*
* Enumeration of shader variants, must match enum gl_shader_texture_variant.
*/
@ -49,8 +52,8 @@ precision mediump float;
* These undeclared identifiers will be #defined by a runtime generated code
* snippet.
*/
const int c_variant = DEF_VARIANT;
const bool c_green_tint = DEF_GREEN_TINT;
compile_const int c_variant = DEF_VARIANT;
compile_const bool c_green_tint = DEF_GREEN_TINT;
vec4
yuva2rgba(vec4 yuva)