75 lines
2.0 KiB
Plaintext
75 lines
2.0 KiB
Plaintext
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#version 330 core
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in vec2 uvCoordinates;
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in vec2 paintUVCoordinates;
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uniform sampler2DRect textureSampler;
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uniform int paintType;
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uniform vec4 paintColor;
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uniform int paintGradientStopCount;
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uniform vec4[16] paintGradientColors;
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uniform float[16] paintGradientPositions;
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uniform vec2[2] paintGradientEnds;
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out vec4 out_Color;
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vec4 solidColor(void)
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{
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return paintColor;
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}
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vec4 gammaMix(vec4 lCol, vec4 rCol, float ratio)
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{
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float gamma = 2.2;
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float one_over_gamma = 1 / gamma;
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vec4 ilCol = vec4(pow(lCol.r, gamma), pow(lCol.g, gamma), pow(lCol.b, gamma), lCol.a);
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vec4 irCol = vec4(pow(rCol.r, gamma), pow(rCol.g, gamma), pow(rCol.b, gamma), rCol.a);
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vec4 fCol = mix(ilCol, irCol, ratio);
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return vec4(pow(fCol.r, one_over_gamma), pow(fCol.g, one_over_gamma), pow(fCol.b, one_over_gamma), fCol.a);
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}
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vec4 gradientColor(void)
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{
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float angle = atan(-paintGradientEnds[1].y + paintGradientEnds[0].y, paintGradientEnds[1].x - paintGradientEnds[0].x);
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float rotatedStartX = paintGradientEnds[0].x * cos(angle) - paintGradientEnds[0].y * sin(angle);
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float rotatedEndX = paintGradientEnds[1].x * cos(angle) - paintGradientEnds[1].y * sin(angle);
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float d = rotatedEndX - rotatedStartX;
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float pX = paintUVCoordinates.x * cos(angle) - paintUVCoordinates.y * sin(angle);
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float mr = smoothstep(rotatedStartX + paintGradientPositions[0] * d, rotatedStartX + paintGradientPositions[1] * d, pX);
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vec4 col = gammaMix(paintGradientColors[0], paintGradientColors[1], mr);
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for (int i = 1; i < paintGradientStopCount - 1; i++)
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{
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mr = smoothstep(rotatedStartX + paintGradientPositions[i] * d, rotatedStartX + paintGradientPositions[i + 1] * d, pX);
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col = gammaMix(col, paintGradientColors[i + 1], mr);
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}
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return col;
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}
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void main(void)
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{
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vec4 col;
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switch (paintType)
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{
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case 0:
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col = solidColor();
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break;
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case 1:
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col = gradientColor();
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break;
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}
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col.rgba *= texture(textureSampler, uvCoordinates);
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out_Color = col;
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}
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