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https://github.com/Ed94/Odin.git
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skytrias
123 lines
3.1 KiB
GLSL
123 lines
3.1 KiB
GLSL
#ifdef GL_ES
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#if defined(GL_FRAGMENT_PRECISION_HIGH) || defined(NANOVG_GL3)
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precision highp float;
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#else
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precision mediump float;
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#endif
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#endif
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#ifdef NANOVG_GL3
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#ifdef USE_UNIFORMBUFFER
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layout(std140) uniform frag {
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mat3 scissorMat;
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mat3 paintMat;
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vec4 innerCol;
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vec4 outerCol;
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vec2 scissorExt;
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vec2 scissorScale;
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vec2 extent;
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float radius;
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float feather;
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float strokeMult;
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float strokeThr;
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int texType;
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int type;
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};
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#else // NANOVG_GL3 && !USE_UNIFORMBUFFER
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uniform vec4 frag[UNIFORMARRAY_SIZE];
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#endif
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uniform sampler2D tex;
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in vec2 ftcoord;
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in vec2 fpos;
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out vec4 outColor;
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#else // !NANOVG_GL3
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uniform vec4 frag[UNIFORMARRAY_SIZE];
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uniform sampler2D tex;
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varying vec2 ftcoord;
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varying vec2 fpos;
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#endif
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#ifndef USE_UNIFORMBUFFER
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#define scissorMat mat3(frag[0].xyz, frag[1].xyz, frag[2].xyz)
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#define paintMat mat3(frag[3].xyz, frag[4].xyz, frag[5].xyz)
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#define innerCol frag[6]
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#define outerCol frag[7]
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#define scissorExt frag[8].xy
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#define scissorScale frag[8].zw
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#define extent frag[9].xy
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#define radius frag[9].z
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#define feather frag[9].w
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#define strokeMult frag[10].x
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#define strokeThr frag[10].y
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#define texType int(frag[10].z)
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#define type int(frag[10].w)
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#endif
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float sdroundrect(vec2 pt, vec2 ext, float rad) {
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vec2 ext2 = ext - vec2(rad,rad);
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vec2 d = abs(pt) - ext2;
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return min(max(d.x,d.y),0.0) + length(max(d,0.0)) - rad;
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}
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// Scissoring
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float scissorMask(vec2 p) {
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vec2 sc = (abs((scissorMat * vec3(p,1.0)).xy) - scissorExt);
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sc = vec2(0.5,0.5) - sc * scissorScale;
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return clamp(sc.x,0.0,1.0) * clamp(sc.y,0.0,1.0);
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}
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#ifdef EDGE_AA
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// Stroke - from [0..1] to clipped pyramid, where the slope is 1px.
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float strokeMask() {
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return min(1.0, (1.0-abs(ftcoord.x*2.0-1.0))*strokeMult) * min(1.0, ftcoord.y);
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}
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#endif
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void main(void) {
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vec4 result;
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float scissor = scissorMask(fpos);
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#ifdef EDGE_AA
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float strokeAlpha = strokeMask();
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if (strokeAlpha < strokeThr) discard;
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#else
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float strokeAlpha = 1.0;
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#endif
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if (type == 0) { // Gradient
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// Calculate gradient color using box gradient
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vec2 pt = (paintMat * vec3(fpos,1.0)).xy;
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float d = clamp((sdroundrect(pt, extent, radius) + feather*0.5) / feather, 0.0, 1.0);
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vec4 color = mix(innerCol,outerCol,d);
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// Combine alpha
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color *= strokeAlpha * scissor;
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result = color;
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} else if (type == 1) { // Image
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// Calculate color fron texture
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vec2 pt = (paintMat * vec3(fpos,1.0)).xy / extent;
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#ifdef NANOVG_GL3
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vec4 color = texture(tex, pt);
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#else
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vec4 color = texture2D(tex, pt);
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#endif
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if (texType == 1) color = vec4(color.xyz*color.w,color.w);
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if (texType == 2) color = vec4(color.x);
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// Apply color tint and alpha.
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color *= innerCol;
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// Combine alpha
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color *= strokeAlpha * scissor;
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result = color;
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} else if (type == 2) { // Stencil fill
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result = vec4(1,1,1,1);
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} else if (type == 3) { // Textured tris
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#ifdef NANOVG_GL3
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vec4 color = texture(tex, ftcoord);
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#else
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vec4 color = texture2D(tex, ftcoord);
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#endif
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if (texType == 1) color = vec4(color.xyz*color.w,color.w);
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if (texType == 2) color = vec4(color.x);
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color *= scissor;
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result = color * innerCol;
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}
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#ifdef NANOVG_GL3
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outColor = result;
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#else
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gl_FragColor = result;
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#endif
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} |