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[require] GLSL >= 1.10 [vertex shader file] glsl-mvp.vert [fragment shader] uniform vec4 arg0; void main() { gl_FragColor = sign(arg0) + vec4(1.5, -0.5, 0.5, 0.5); } [test] uniform vec4 arg0 -5.0 5.0 0.0 0.0 draw rect -1 -1 2 2 probe rgb 1 1 0.5 0.5 0.5 0.5