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[require]
GLSL >= 1.10
[vertex shader]
uniform vec4 color;
varying vec4 color1;
varying vec4 color2;
void set_color2(void)
{
color2 = color1;
}
void main()
{
gl_Position = gl_Vertex;
/* Due to a bug in glsl2, this particular assignment followed
* by the function call below would get the expression moved to
* color2 and color1 would be eliminated.
*/
color1 = color * 0.5;
set_color2();
}
[fragment shader]
varying vec4 color1;
varying vec4 color2;
void main()
{
gl_FragColor = color1;
}
[test]
uniform vec4 color 0.0 1.0 0.0 0.0
draw rect -1 -1 2 2
probe all rgba 0.0 0.5 0.0 0.0
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