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gles2: Use GL_ES instead of __VERSION__ for setting precision

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Mesa has started getting picky about specifying the precision for
floating types in the fragment shader. We already have a default
precision specifier in all the fragment shaders but apparently this
wasn't working because it is only used when the __VERSION__ define is
100 and Mesa is reporting 110. Regardless of whether Mesa is doing the
right thing or not I think it makes sense to use GL_ES instead of
__VERSION__ because we will also need the precision specifier if we
start requesting GLSL 3.0. The GLES specification explictly states
that GL_ES will only be defined for GLES and this is similar to what
the internal meta shaders do in Mesa.

http://cgit.freedesktop.org/mesa/mesa/commit/?id=cabd45773b58d6aa482

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 37f5205739cfb0745ea74dedaec117081ba0088b)
This commit is contained in:
Neil Roberts 2013-08-23 12:20:27 +01:00
parent 7bab449700
commit cf44ad2493
1 changed files with 1 additions and 1 deletions
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cogl/cogl-glsl-shader-boilerplate.h
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@ -53,7 +53,7 @@
"attribute vec3 cogl_normal_in;\n"
#define _COGL_FRAGMENT_SHADER_BOILERPLATE \
"#if __VERSION__ == 100\n" \
"#ifdef GL_ES\n" \
"precision highp float;\n" \
"#endif\n" \
_COGL_COMMON_SHADER_BOILERPLATE \