mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-12-04 21:31:11 -05:00
42 lines
968 B
Text
42 lines
968 B
Text
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struct v2f_vertex_lit {
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vec2 uv;
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vec4 diff;
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vec4 spec;
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};
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struct v2f_img {
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vec4 pos;
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vec2 uv;
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};
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struct appdata_img {
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vec4 vertex;
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vec2 texcoord;
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};
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uniform sampler2D _MainTex;
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uniform float _RampOffset;
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uniform sampler2D _RampTex;
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float Luminance( in vec3 c );
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vec4 frag( in v2f_img i );
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float Luminance( in vec3 c ) {
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return dot( c, vec3( 0.220000, 0.707000, 0.0710000));
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}
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vec4 frag( in v2f_img i ) {
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vec4 original;
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float grayscale;
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vec2 remap;
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vec4 xlat_var_output;
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original = texture2D( _MainTex, i.uv);
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grayscale = Luminance( original.xyz );
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remap = vec2( (grayscale + _RampOffset), 0.500000);
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xlat_var_output = texture2D( _RampTex, remap);
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xlat_var_output.w = original.w ;
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return xlat_var_output;
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}
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void main() {
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vec4 xl_retval;
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v2f_img xlt_i;
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xlt_i.pos = vec4(0.0);
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xlt_i.uv = vec2( gl_TexCoord[0]);
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xl_retval = frag( xlt_i);
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gl_FragData[0] = vec4( xl_retval);
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}
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