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61 lines
2.1 KiB
GLSL
61 lines
2.1 KiB
GLSL
#ifdef GL_OES_standard_derivatives
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#extension GL_OES_standard_derivatives : enable
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#endif
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uniform vec4 color;
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uniform float cellAlpha;
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uniform vec2 lineCount;
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uniform vec2 lineThickness;
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uniform vec2 lineOffset;
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czm_material czm_getMaterial(czm_materialInput materialInput)
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{
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czm_material material = czm_getDefaultMaterial(materialInput);
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vec2 st = materialInput.st;
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float scaledWidth = fract(lineCount.s * st.s - lineOffset.s);
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scaledWidth = abs(scaledWidth - floor(scaledWidth + 0.5));
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float scaledHeight = fract(lineCount.t * st.t - lineOffset.t);
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scaledHeight = abs(scaledHeight - floor(scaledHeight + 0.5));
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float value;
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#ifdef GL_OES_standard_derivatives
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// Fuzz Factor - Controls blurriness of lines
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const float fuzz = 1.2;
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vec2 thickness = (lineThickness * czm_pixelRatio) - 1.0;
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// From "3D Engine Design for Virtual Globes" by Cozzi and Ring, Listing 4.13.
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vec2 dx = abs(dFdx(st));
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vec2 dy = abs(dFdy(st));
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vec2 dF = vec2(max(dx.s, dy.s), max(dx.t, dy.t)) * lineCount;
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value = min(
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smoothstep(dF.s * thickness.s, dF.s * (fuzz + thickness.s), scaledWidth),
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smoothstep(dF.t * thickness.t, dF.t * (fuzz + thickness.t), scaledHeight));
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#else
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// Fuzz Factor - Controls blurriness of lines
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const float fuzz = 0.05;
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vec2 range = 0.5 - (lineThickness * 0.05);
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value = min(
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1.0 - smoothstep(range.s, range.s + fuzz, scaledWidth),
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1.0 - smoothstep(range.t, range.t + fuzz, scaledHeight));
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#endif
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// Edges taken from RimLightingMaterial.glsl
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// See http://www.fundza.com/rman_shaders/surface/fake_rim/fake_rim1.html
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float dRim = 1.0 - abs(dot(materialInput.normalEC, normalize(materialInput.positionToEyeEC)));
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float sRim = smoothstep(0.8, 1.0, dRim);
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value *= (1.0 - sRim);
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vec4 halfColor;
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halfColor.rgb = color.rgb * 0.5;
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halfColor.a = color.a * (1.0 - ((1.0 - cellAlpha) * value));
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halfColor = czm_gammaCorrect(halfColor);
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material.diffuse = halfColor.rgb;
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material.emission = halfColor.rgb;
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material.alpha = halfColor.a;
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return material;
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}
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