ADSGouraud.vp

最新推荐文章于 2021-04-05 13:25:09 发布

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本文介绍了一个OpenGL ES着色器程序，该程序实现了基础的光照模型，包括环境光、漫反射和镜面反射效果。通过传递光照位置、材质属性等参数到着色器，可以实现实时计算光照效果。

#version 130

in vec4 vVertex;
in vec3 vNormal;

uniform vec4    ambientColor;
uniform vec4    diffuseColor;	
uniform vec4    specularColor;

uniform vec3	vLightPosition;
uniform mat4	mvpMatrix;
uniform mat4	mvMatrix;
uniform mat3	normalMatrix;

// Color to fragment program
smooth out vec4 vVaryingColor;

void main(void) 
{ 
	vec3 vEyeNormal = normalMatrix * vNormal;

	vec4 vPosition4 = mvMatrix * vVertex;
	vec3 vPosition3 = vPosition4.xyz / vPosition4.w;
	vec3 vLightDir = normalize(vLightPosition - vPosition3);
	float diff = max(0.0, dot(vEyeNormal, vLightDir));
	vVaryingColor = diff * diffuseColor;
	vVaryingColor += ambientColor;
	vec3 vReflection = normalize(reflect(-vLightDir, vEyeNormal));

	float spec = max(0.0, dot(vEyeNormal, vReflection));
	if(diff != 0)
	{
        	float fSpec = pow(spec, 128.0);
        	vVaryingColor.rgb += vec3(fSpec, fSpec, fSpec);
	}

	gl_Position = mvpMatrix * vVertex;
}