158 lines
3.7 KiB
Go
Executable file
158 lines
3.7 KiB
Go
Executable file
package goglbackend
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var unifiedVS = `
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attribute vec2 vertex, texCoord;
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uniform vec2 canvasSize;
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uniform mat3 matrix;
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varying vec2 v_cp, v_tc;
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void main() {
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v_tc = texCoord;
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vec3 v = matrix * vec3(vertex.xy, 1.0);
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vec2 tf = v.xy / v.z;
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v_cp = tf;
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vec2 glp = tf * 2.0 / canvasSize - 1.0;
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gl_Position = vec4(glp.x, -glp.y, 0.0, 1.0);
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}
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`
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var unifiedFS = `
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#ifdef GL_ES
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precision mediump float;
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#endif
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varying vec2 v_cp, v_tc;
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uniform int func;
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uniform vec4 color;
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uniform float globalAlpha;
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uniform sampler2D gradient;
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uniform vec2 from, dir, to;
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uniform float len, radFrom, radTo;
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uniform vec2 imageSize;
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uniform sampler2D image;
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uniform mat3 imageTransform;
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uniform vec2 repeat;
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uniform bool useAlphaTex;
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uniform sampler2D alphaTex;
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uniform int boxSize;
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uniform bool boxVertical;
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uniform float boxScale;
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uniform float boxOffset;
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bool isNaN(float v) {
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return v < 0.0 || 0.0 < v || v == 0.0 ? false : true;
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}
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void main() {
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vec4 col = color;
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if (func == 5) {
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vec4 sum = vec4(0.0);
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if (boxVertical) {
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vec2 start = v_tc - vec2(0.0, (float(boxSize) * 0.5 + boxOffset) * boxScale);
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for (int i=0; i <= boxSize; i++) {
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sum += texture2D(image, start + vec2(0.0, float(i) * boxScale));
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}
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} else {
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vec2 start = v_tc - vec2((float(boxSize) * 0.5 + boxOffset) * boxScale, 0.0);
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for (int i=0; i <= boxSize; i++) {
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sum += texture2D(image, start + vec2(float(i) * boxScale, 0.0));
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}
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}
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gl_FragColor = sum / float(boxSize+1);
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return;
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}
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if (func == 1) {
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vec2 v = v_cp - from;
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float r = dot(v, dir) / len;
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r = clamp(r, 0.0, 1.0);
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col = texture2D(gradient, vec2(r, 0.0));
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} else if (func == 2) {
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float o_a = 0.5 * sqrt(
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pow(-2.0*from.x*from.x+2.0*from.x*to.x+2.0*from.x*v_cp.x-2.0*to.x*v_cp.x-2.0*from.y*from.y+2.0*from.y*to.y+2.0*from.y*v_cp.y-2.0*to.y*v_cp.y+2.0*radFrom*radFrom-2.0*radFrom*radTo, 2.0)
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-4.0*(from.x*from.x-2.0*from.x*v_cp.x+v_cp.x*v_cp.x+from.y*from.y-2.0*from.y*v_cp.y+v_cp.y*v_cp.y-radFrom*radFrom)
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*(from.x*from.x-2.0*from.x*to.x+to.x*to.x+from.y*from.y-2.0*from.y*to.y+to.y*to.y-radFrom*radFrom+2.0*radFrom*radTo-radTo*radTo)
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);
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float o_b = (from.x*from.x-from.x*to.x-from.x*v_cp.x+to.x*v_cp.x+from.y*from.y-from.y*to.y-from.y*v_cp.y+to.y*v_cp.y-radFrom*radFrom+radFrom*radTo);
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float o_c = (from.x*from.x-2.0*from.x*to.x+to.x*to.x+from.y*from.y-2.0*from.y*to.y+to.y*to.y-radFrom*radFrom+2.0*radFrom*radTo-radTo*radTo);
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float o1 = (-o_a + o_b) / o_c;
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float o2 = (o_a + o_b) / o_c;
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if (isNaN(o1) && isNaN(o2)) {
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gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
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return;
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}
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float o = max(o1, o2);
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o = clamp(o, 0.0, 1.0);
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col = texture2D(gradient, vec2(o, 0.0));
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} else if (func == 3) {
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vec3 tfpt = vec3(v_cp, 1.0) * imageTransform;
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vec2 imgpt = tfpt.xy / imageSize;
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col = texture2D(image, mod(imgpt, 1.0));
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if (imgpt.x < 0.0 || imgpt.x > 1.0) {
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col *= repeat.x;
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}
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if (imgpt.y < 0.0 || imgpt.y > 1.0) {
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col *= repeat.y;
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}
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} else if (func == 4) {
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col = texture2D(image, v_tc);
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}
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if (useAlphaTex) {
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col.a *= texture2D(alphaTex, v_tc).a * globalAlpha;
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} else {
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col.a *= globalAlpha;
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}
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gl_FragColor = col;
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}
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`
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const (
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shdFuncSolid int32 = iota
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shdFuncLinearGradient
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shdFuncRadialGradient
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shdFuncImagePattern
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shdFuncImage
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shdFuncBoxBlur
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)
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type unifiedShader struct {
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shaderProgram
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Vertex uint32
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TexCoord uint32
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CanvasSize int32
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Matrix int32
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Color int32
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GlobalAlpha int32
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Func int32
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UseAlphaTex int32
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AlphaTex int32
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Gradient int32
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From, To, Dir int32
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Len int32
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RadFrom, RadTo int32
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ImageSize int32
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Image int32
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ImageTransform int32
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Repeat int32
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BoxSize int32
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BoxVertical int32
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BoxScale int32
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BoxOffset int32
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}
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