48 lines
1.1 KiB
GLSL
48 lines
1.1 KiB
GLSL
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#ifdef __cplusplus
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#include <string>
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const std::string shader_pp_outline_step_frag = R"("
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#version 300 es
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precision mediump float;
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out vec4 FragColor;
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in vec2 uv;
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in vec2 pos;
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uniform vec2 viewportSize;
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uniform sampler2D albedo;
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uniform sampler2D mask;
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#define LINE_WEIGHT 3.0
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void main() {
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float dx = (1.0 / viewportSize.x) * LINE_WEIGHT;
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float dy = (1.0 / viewportSize.y) * LINE_WEIGHT;
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vec2 uvCenter = uv;
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vec2 uvRight = vec2(uvCenter.x + dx, uvCenter.y);
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vec2 uvTop = vec2(uvCenter.x, uvCenter.y - dx);
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vec2 uvTopRight = vec2(uvCenter.x + dx, uvCenter.y - dx);
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float mCenter = texture(mask, uvCenter).r;
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float mTop = texture(mask, uvTop).r;
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float mRight = texture(mask, uvRight).r;
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float mTopRight = texture(mask, uvTopRight).r;
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float dT = abs(mCenter - mTop);
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float dR = abs(mCenter - mRight);
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float dTR = abs(mCenter - mTopRight);
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float delta = 0.0;
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delta = max(delta, dT);
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delta = max(delta, dR);
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delta = max(delta, dTR);
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vec4 outline = vec4(delta, delta, delta, 1.0);
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vec4 albedo = texture(albedo, uv);
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FragColor = albedo - outline;
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}
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")";
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#endif
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