31 lines
991 B
GLSL
31 lines
991 B
GLSL
#version 150
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vec4 linear_fog(vec4 inColor, float vertexDistance, float fogStart, float fogEnd, vec4 fogColor) {
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if (vertexDistance <= fogStart) {
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return inColor;
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}
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float fogValue = vertexDistance < fogEnd ? smoothstep(fogStart, fogEnd, vertexDistance) : 1.0;
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return vec4(mix(inColor.rgb, fogColor.rgb, fogValue * fogColor.a), inColor.a);
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}
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float linear_fog_fade(float vertexDistance, float fogStart, float fogEnd) {
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if (vertexDistance <= fogStart) {
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return 1.0;
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} else if (vertexDistance >= fogEnd) {
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return 0.0;
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}
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return smoothstep(fogEnd, fogStart, vertexDistance);
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}
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float fog_distance(mat4 modelViewMat, vec3 pos, int shape) {
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if (shape == 0) {
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return length((modelViewMat * vec4(pos, 1.0)).xyz);
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} else {
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float distXZ = length((modelViewMat * vec4(pos.x, 0.0, pos.z, 1.0)).xyz);
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float distY = length((modelViewMat * vec4(0.0, pos.y, 0.0, 1.0)).xyz);
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return max(distXZ, distY);
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}
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}
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