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* tests/test-shader.c: improved readability of fragment shader

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examples by factoring out common bits into FRAGMENT_SHADER_BEGIN and
FRAGMENT_SHADER_END macros.
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Øyvind Kolås 2008-03-10 23:07:22 +00:00
parent 74c8271db6
commit aa1e89cc92
2 changed files with 91 additions and 105 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2008-03-10 Øyvind Kolås <pippin@o-hand.com>
* tests/test-shader.c: improved readability of fragment shader
examples by factoring out common bits into FRAGMENT_SHADER_BEGIN and
FRAGMENT_SHADER_END macros.
2008-03-09 Matthew Allum <mallum@openedhand.com> 2008-03-09 Matthew Allum <mallum@openedhand.com>
* clutter/clutter-id-pool.c: (clutter_id_pool_free): * clutter/clutter-id-pool.c: (clutter_id_pool_free):

146
tests/test-shader.c
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@ -17,128 +17,108 @@ typedef struct
gchar *source; gchar *source;
} ShaderSource; } ShaderSource;
/* a couple of boilerplate defines that are common amongst all the
* sample shaders
*/
/* FRAGMENT_SHADER_BEGIN: generate boilerplate with a local vec4 color already initialized,
* from a sampler2DRect in a variable tex.
*/
#define FRAGMENT_SHADER_BEGIN \
"uniform sampler2DRect tex;" \
"void main (){" \
" vec4 color = texture2DRect (tex, vec2(gl_TexCoord[0].st));"
/* FRAGMENT_SHADER_END: apply the changed color to the output buffer correctly blended
* with the gl specified color (makes the opacity of actors work correctly).
*/
#define FRAGMENT_SHADER_END \
" gl_FragColor = color;" \
" gl_FragColor = gl_FragColor * gl_Color;" \
"}"
static ShaderSource shaders[]= static ShaderSource shaders[]=
{ {
{"brightness-contrast", {"brightness-contrast",
"uniform float brightness, contrast;"
"uniform float brightness;" FRAGMENT_SHADER_BEGIN
"uniform float contrast;" " color.rgb = (color.rgb - vec3(0.5, 0.5, 0.5)) * contrast + vec3 (brightness + 0.5, brightness + 0.5, brightness + 0.5);"
"uniform sampler2DRect pend_s3_tex;" FRAGMENT_SHADER_END
""
"void main()"
"{"
" vec4 pend_s4_result;"
" pend_s4_result = texture2DRect(pend_s3_tex, gl_TexCoord[0].xy);"
" pend_s4_result.x = (pend_s4_result.x - 0.5)*contrast + brightness + 0.5;"
" pend_s4_result.y = (pend_s4_result.y - 0.5)*contrast + brightness + 0.5;"
" pend_s4_result.z = (pend_s4_result.z - 0.5)*contrast + brightness + 0.5;"
" gl_FragColor = pend_s4_result;"
" gl_FragColor = gl_FragColor * gl_Color;"
"}",
}, },
{"box-blur", {"box-blur",
#if GPU_SUPPORTS_DYNAMIC_BRANCHING #if GPU_SUPPORTS_DYNAMIC_BRANCHING
"uniform float radius ;" "uniform float radius;"
"uniform sampler2DRect rectTexture;" FRAGMENT_SHADER_BEGIN
"" "float u, v;"
"void main()" "int count = 1;"
"{" "for (u=-radius;u<radius;u++)"
" vec4 color = texture2DRect(rectTexture, gl_TexCoord[0].st);"
" float u;"
" float v;"
" int count = 1;"
" for (u=-radius;u<radius;u++)"
" for (v=-radius;v<radius;v++)" " for (v=-radius;v<radius;v++)"
" {" " {"
" color += texture2DRect(rectTexture, vec2(gl_TexCoord[0].s + u * 2.0, gl_TexCoord[0].t +v * 2.0));" " color += texture2DRect(tex, "
" vec2(gl_TexCoord[0].s + u * 2.0, gl_TexCoord[0].t +v * 2.0));"
" count ++;" " count ++;"
" }" " }"
"" "color = color / float(count);"
" gl_FragColor = color / float(count);" FRAGMENT_SHADER_END
" gl_FragColor = gl_FragColor * gl_Color;"
"}"
#else #else
"uniform sampler2DRect rectTexture;" "vec4 get_rgba_rel(sampler2DRect tex, float dx, float dy)"
"vec4 tex_load(const vec2 coord)"
"{" "{"
" return texture2DRect (rectTexture, gl_TexCoord[0].st + coord * 2.0);" " return texture2DRect (tex, gl_TexCoord[0].st + vec2(dx,dy) * 2.0);"
"}" "}"
""
"void main()" FRAGMENT_SHADER_BEGIN
"{"
" vec4 color;"
" float count = 1.0;" " float count = 1.0;"
"" " color += get_rgba_rel (tex, -1.0, -1.0); count++;"
" color = texture2DRect (rectTexture, gl_TexCoord[0].st);" " color += get_rgba_rel (tex, -1.0, 0.0); count++;"
" color += tex_load (vec2 (-1.0, -1.0)); count++;" " color += get_rgba_rel (tex, -1.0, 1.0); count++;"
" color += tex_load (vec2 (-1.0, 0.0)); count++;" " color += get_rgba_rel (tex, 0.0, -1.0); count++;"
" color += tex_load (vec2 (-1.0, 1.0)); count++;" " color += get_rgba_rel (tex, 0.0, 0.0); count++;"
" color += tex_load (vec2 ( 0.0, -1.0)); count++;" " color += get_rgba_rel (tex, 0.0, 1.0); count++;"
" color += tex_load (vec2 ( 0.0, 0.0)); count++;" " color += get_rgba_rel (tex, 1.0, -1.0); count++;"
" color += tex_load (vec2 ( 0.0, 1.0)); count++;" " color += get_rgba_rel (tex, 1.0, 0.0); count++;"
" color += tex_load (vec2 ( 1.0, -1.0)); count++;" " color += get_rgba_rel (tex, 1.0, 1.0); count++;"
" color += tex_load (vec2 ( 1.0, 0.0)); count++;" " color = color / count;"
" color += tex_load (vec2 ( 1.0, 1.0)); count++;" FRAGMENT_SHADER_END
""
" gl_FragColor = color / count;"
" gl_FragColor = gl_FragColor * gl_Color;"
"}"
#endif #endif
}, },
{"invert", {"invert",
FRAGMENT_SHADER_BEGIN
"uniform sampler2DRect tex;\n" " color.rgb = vec3(1.0, 1.0, 1.0) - color.rgb;\n"
"void main ()\n" FRAGMENT_SHADER_END
"{\n"
" vec4 color = texture2DRect (tex, vec2(gl_TexCoord[0].st));\n"
" gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0) - color;\n"
" gl_FragColor.a = color.a;\n"
" gl_FragColor = gl_FragColor * gl_Color;"
"}"
}, },
{"brightness-contrast",
"uniform sampler2DRect tex;" {"brightness-contrast",
"uniform float brightness;" "uniform float brightness;"
"uniform float contrast;" "uniform float contrast;"
"void main ()" FRAGMENT_SHADER_BEGIN
"{"
" vec4 color = texture2DRect (tex, vec2(gl_TexCoord[0].st));"
" color.r = (color.r - 0.5) * contrast + brightness + 0.5;" " color.r = (color.r - 0.5) * contrast + brightness + 0.5;"
" color.g = (color.g - 0.5) * contrast + brightness + 0.5;" " color.g = (color.g - 0.5) * contrast + brightness + 0.5;"
" color.b = (color.b - 0.5) * contrast + brightness + 0.5;" " color.b = (color.b - 0.5) * contrast + brightness + 0.5;"
" gl_FragColor = color;" FRAGMENT_SHADER_END
" gl_FragColor = gl_FragColor * gl_Color;"
"}",
}, },
{"gray", {"gray",
"uniform sampler2DRect tex;" FRAGMENT_SHADER_BEGIN
"void main ()"
"{"
" vec4 color = texture2DRect (tex, vec2(gl_TexCoord[0].st));"
" float avg = (color.r + color.g + color.b) / 3.0;" " float avg = (color.r + color.g + color.b) / 3.0;"
" color.r = avg;" " color.r = avg;"
" color.g = avg;" " color.g = avg;"
" color.b = avg;" " color.b = avg;"
" gl_FragColor = color;" FRAGMENT_SHADER_END
" gl_FragColor = gl_FragColor * gl_Color;"
"}",
}, },
{"combined-mirror", {"combined-mirror",
"uniform sampler2DRect tex;" FRAGMENT_SHADER_BEGIN
"void main ()"
"{"
" vec4 color = texture2DRect (tex, vec2(gl_TexCoord[0].st));"
" vec4 colorB = texture2DRect (tex, vec2(gl_TexCoord[0].ts));" " vec4 colorB = texture2DRect (tex, vec2(gl_TexCoord[0].ts));"
" float avg = (color.r + color.g + color.b) / 3.0;" " float avg = (color.r + color.g + color.b) / 3.0;"
" color.r = avg;" " color.r = avg;"
" color.g = avg;" " color.g = avg;"
" color.b = avg;" " color.b = avg;"
" color = (color + colorB)/2.0;" " color = (color + colorB)/2.0;"
" gl_FragColor = color;" FRAGMENT_SHADER_END
" gl_FragColor = gl_FragColor * gl_Color;"
"}",
}, },
/* Terminating NULL sentinel */
{NULL, NULL} {NULL, NULL}
}; };