44 lines
839 B
GLSL
44 lines
839 B
GLSL
uniform vec3 Scroll;
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uniform vec3 r1, r2;
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attribute vec4 aVertexPosition;
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attribute vec4 aVertexTexCoord;
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varying vec4 vTexCoord;
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varying vec4 vChannelMask;
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varying vec4 vDepthMask;
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vec4 DecodeChannelMask(float x)
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{
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float y = abs(x);
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if (y > 0.7)
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return vec4(0,0,0,1);
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if (y > 0.5)
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return vec4(0,0,1,0);
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if (y > 0.3)
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return vec4(0,1,0,0);
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else
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return vec4(1,0,0,0);
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}
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vec4 DecodeDepthChannelMask(float x)
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{
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if (x > 0.0)
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return vec4(0,0,0,0);
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if (x < -0.7)
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return vec4(1,0,0,0);
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if (x < -0.5)
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return vec4(0,0,0,1);
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if (x < -0.3)
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return vec4(0,0,1,0);
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else
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return vec4(0,1,0,0);
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}
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void main()
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{
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gl_Position = vec4((aVertexPosition.xyz - Scroll.xyz) * r1 + r2, 1);
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vTexCoord = aVertexTexCoord;
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vChannelMask = DecodeChannelMask(aVertexTexCoord.w);
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vDepthMask = DecodeDepthChannelMask(aVertexTexCoord.w);
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}
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