Mike Erwin
b95ee78ed3
- use in/out instead of attribute/varying - use named output instead of gl_FragColor - use texture() instead of the multitude of older texture sampling functions The #if __VERSION__ == 120 paths (needed on Mac) will be removed after we switch to 3.3 core profile. Part of T49165 (general OpenGL upgrade)
57 lines
1.3 KiB
GLSL
57 lines
1.3 KiB
GLSL
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#if __VERSION__ == 120
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varying vec3 coords;
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#define fragColor gl_FragColor
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#else
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in vec3 coords;
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out vec4 fragColor;
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#define texture1D texture
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#define texture3D texture
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#endif
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uniform vec3 active_color;
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uniform float step_size;
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uniform float density_scale;
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uniform sampler3D soot_texture;
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uniform sampler3D shadow_texture;
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#ifdef USE_COBA
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uniform sampler1D transfer_texture;
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uniform sampler3D color_band_texture;
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#endif
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void main()
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{
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/* compute color and density from volume texture */
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vec4 soot = texture3D(soot_texture, coords);
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#ifndef USE_COBA
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vec3 soot_color;
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if (soot.a != 0) {
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soot_color = active_color * soot.rgb / soot.a;
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}
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else {
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soot_color = vec3(0, 0, 0);
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}
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float soot_density = density_scale * soot.a;
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/* compute transmittance and alpha */
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float soot_transmittance = pow(2.71828182846, -soot_density * step_size);
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float soot_alpha = 1.0 - soot_transmittance;
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/* shade */
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float shadow = texture3D(shadow_texture, coords).r;
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soot_color *= soot_transmittance * shadow;
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/* premultiply alpha */
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vec4 color = vec4(soot_alpha * soot_color, soot_alpha);
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#else
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float color_band = texture3D(color_band_texture, coords).r;
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vec4 transfer_function = texture1D(transfer_texture, color_band);
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vec4 color = transfer_function * density_scale;
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#endif
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fragColor = color;
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}
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