45 lines
1.4 KiB
GLSL
45 lines
1.4 KiB
GLSL
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in vec4 gl_FragCoord;
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#request uniform "prev" tex
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uniform sampler2D tex; /* screen texture */
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out vec4 fragment; /* output */
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#include "@graph.glsl"
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#include ":graph.glsl"
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#if DRAW_OUTLINE == 0 && DRAW_HIGHLIGHT == 0
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#error __disablestage
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#endif
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void main() {
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fragment = texelFetch(tex, ivec2(gl_FragCoord.x, gl_FragCoord.y), 0);
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vec4
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a0 = texelFetch(tex, ivec2((gl_FragCoord.x + 1), (gl_FragCoord.y + 0)), 0),
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a1 = texelFetch(tex, ivec2((gl_FragCoord.x + 1), (gl_FragCoord.y + 1)), 0),
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a2 = texelFetch(tex, ivec2((gl_FragCoord.x + 0), (gl_FragCoord.y + 1)), 0),
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a3 = texelFetch(tex, ivec2((gl_FragCoord.x + 1), (gl_FragCoord.y + 0)), 0),
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a4 = texelFetch(tex, ivec2((gl_FragCoord.x - 1), (gl_FragCoord.y - 0)), 0),
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a5 = texelFetch(tex, ivec2((gl_FragCoord.x - 1), (gl_FragCoord.y - 1)), 0),
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a6 = texelFetch(tex, ivec2((gl_FragCoord.x - 0), (gl_FragCoord.y - 1)), 0),
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a7 = texelFetch(tex, ivec2((gl_FragCoord.x - 1), (gl_FragCoord.y - 0)), 0);
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vec4 avg = (a0 + a1 + a2 + a3 + a4 + a5 + a6 + a7) / 8.0;
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if (avg.a > 0){
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if (fragment.a <= 0) {
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/* outline */
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#if DRAW_OUTLINE > 0
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fragment = OUTLINE;
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#endif
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} else if (avg.a < 1) {
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/* creates a highlight along the edge of the spectrum */
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#if DRAW_HIGHLIGHT > 0
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fragment.rgb *= avg.a * 2;
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#endif
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}
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}
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}
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