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* tests/test-shader.c: (button_release_cb): added simplified

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implementation of a box-blur shader from Gwenole Beauchesne that
should work on GLSL implementing low-end IGPs not implementing
dynamic branching. The original code used crashed some of these
due to bugs in drivers or similar. Resolves bug #710.
This commit is contained in:
Øyvind Kolås 2008-02-07 16:52:12 +00:00
parent 1f5e879e2f
commit 2994de63ef
2 changed files with 43 additions and 1 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2008-02-07 Øyvind Kolås <pippin@o-hand.com>
* tests/test-shader.c: (button_release_cb): added simplified
implementation of a box-blur shader from Gwenole Beauchesne that
should work on GLSL implementing low-end IGPs not implementing
dynamic branching. The original code used crashed some of these
due to bugs in drivers or similar. Resolves bug #710.
2008-02-07 Tomas Frydrych <tf@openedhand.com>
* clutter/clutter-actor.c:

36
tests/test-shader.c
View File

@ -6,6 +6,11 @@
#include <stdlib.h>
#include <glib.h>
/* Dynamic branching appeared in "Shader Model 3.0" that low-end IGPs
* don't support.
*/
#define GPU_SUPPORTS_DYNAMIC_BRANCHING 0
typedef struct
{
gchar *name;
@ -32,7 +37,7 @@ static ShaderSource shaders[]=
"}",
},
{"box-blur",
#if GPU_SUPPORTS_DYNAMIC_BRANCHING
"uniform float radius ;"
"uniform sampler2DRect rectTexture;"
""
@ -52,6 +57,33 @@ static ShaderSource shaders[]=
" gl_FragColor = color / float(count);"
" gl_FragColor = gl_FragColor * gl_Color;"
"}"
#else
"uniform sampler2DRect rectTexture;"
"vec4 tex_load(const vec2 coord)"
"{"
" return texture2DRect (rectTexture, gl_TexCoord[0].st + coord * 2.0);"
"}"
""
"void main()"
"{"
" vec4 color;"
" float count = 1.0;"
""
" color = texture2DRect (rectTexture, gl_TexCoord[0].st);"
" color += tex_load (vec2 (-1.0, -1.0)); count++;"
" color += tex_load (vec2 (-1.0, 0.0)); count++;"
" color += tex_load (vec2 (-1.0, 1.0)); count++;"
" color += tex_load (vec2 ( 0.0, -1.0)); count++;"
" color += tex_load (vec2 ( 0.0, 0.0)); count++;"
" color += tex_load (vec2 ( 0.0, 1.0)); count++;"
" color += tex_load (vec2 ( 1.0, -1.0)); count++;"
" color += tex_load (vec2 ( 1.0, 0.0)); count++;"
" color += tex_load (vec2 ( 1.0, 1.0)); count++;"
""
" gl_FragColor = color / count;"
" gl_FragColor = gl_FragColor * gl_Color;"
"}"
#endif
},
{"invert",
@ -163,6 +195,8 @@ button_release_cb (ClutterActor *actor,
clutter_actor_set_shader (actor, NULL);
clutter_actor_set_shader (actor, shader);
clutter_actor_set_shader_param (actor, "radius", 3.0);
clutter_actor_set_shader_param (actor, "brightness", 0.4);
clutter_actor_set_shader_param (actor, "contrast", -1.9);
}
}
return FALSE;