36 lines
1.0 KiB
GLSL
36 lines
1.0 KiB
GLSL
// XC_BUILTIN_SKYBOX_OPENGL_PS
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#version 430
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layout(std140, binding = 0) uniform EnvironmentConstants {
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vec4 gSkyboxTopColor;
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vec4 gSkyboxHorizonColor;
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vec4 gSkyboxBottomColor;
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vec4 gCameraRightAndTanHalfFov;
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vec4 gCameraUpAndAspect;
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vec4 gCameraForwardAndUnused;
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};
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in vec2 vNdc;
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layout(location = 0) out vec4 fragColor;
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void main() {
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float tanHalfFov = gCameraRightAndTanHalfFov.w;
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float aspect = gCameraUpAndAspect.w;
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vec3 viewRay = normalize(
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gCameraForwardAndUnused.xyz +
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vNdc.x * aspect * tanHalfFov * gCameraRightAndTanHalfFov.xyz +
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vNdc.y * tanHalfFov * gCameraUpAndAspect.xyz);
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float vertical = clamp(viewRay.y, -1.0, 1.0);
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vec3 color = gSkyboxHorizonColor.rgb;
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if (vertical >= 0.0) {
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color = mix(gSkyboxHorizonColor.rgb, gSkyboxTopColor.rgb, pow(clamp(vertical, 0.0, 1.0), 0.65));
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} else {
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color = mix(gSkyboxHorizonColor.rgb, gSkyboxBottomColor.rgb, pow(clamp(-vertical, 0.0, 1.0), 0.55));
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}
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fragColor = vec4(color, 1.0);
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}
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