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#version 130
//! [0]
uniform vec4 ambientColor;
uniform vec4 diffuseColor;
uniform vec4 specularColor;
uniform float ambientReflection;
uniform float diffuseReflection;
uniform float specularReflection;
uniform float shininess;
uniform sampler2D texture;
in vec3 varyingNormal;
in vec3 varyingLightDirection;
in vec3 varyingViewerDirection;
in vec2 varyingTextureCoordinate;
out vec4 fragColor;
void main(void)
{
vec3 normal = normalize(varyingNormal);
vec3 lightDirection = normalize(varyingLightDirection);
vec3 viewerDirection = normalize(varyingViewerDirection);
vec4 ambientIllumination = ambientReflection * ambientColor;
vec4 diffuseIllumination = diffuseReflection * max(0.0, dot(lightDirection, normal)) * diffuseColor;
vec4 specularIllumination = specularReflection * pow(max(0.0,
dot(-reflect(lightDirection, normal), viewerDirection)
), shininess) * specularColor;
fragColor = texture2D(texture,
varyingTextureCoordinate) * (ambientIllumination + diffuseIllumination
) + specularIllumination;
}
//! [0]
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