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71 lines
2.1 KiB
71 lines
2.1 KiB
#version 400 core
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subroutine vec4 SurfaceColor();
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uniform sampler2D U_MainTexture;
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subroutine uniform SurfaceColor U_SurfaceColor;
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varying vec3 V_Normal;
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varying vec4 V_WorldPos;//当前的位置
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varying vec2 V_Texcoord;
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subroutine (SurfaceColor) vec4 Ambient(){
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//ambient
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vec4 AmbientLightColor = vec4(0.4, 0.4, 0.4, 1.0);
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vec4 AmbientMaterial = vec4(0.2, 0.2, 0.2, 1.0);
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vec4 AmbientColor = AmbientLightColor*AmbientMaterial;
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vec4 ret = AmbientColor;
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return ret;
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}
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subroutine (SurfaceColor) vec4 Diffuse(){
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vec3 lightPos = vec3(10.0, 10.0, 0.0);
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vec3 L=lightPos;
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L = normalize(L);
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vec3 n = normalize(V_Normal);
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//ambient
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vec4 AmbientLightColor = vec4(0.4, 0.4, 0.4, 1.0);
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vec4 AmbientMaterial = vec4(0.2, 0.2, 0.2, 1.0);
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vec4 AmbientColor = AmbientLightColor*AmbientMaterial;
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//diffuse
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vec4 DiffuseLightColor = vec4(1.0,1.0,1.0,1.0);
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vec4 DiffuseMaterial = vec4(0.8, 0.8, 0.8, 1.0);
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vec4 diffuseColor = DiffuseLightColor*DiffuseMaterial*max(0.0, dot(L,n));
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vec4 ret = AmbientColor + texture2D(U_MainTexture, V_Texcoord) * diffuseColor;
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return ret;
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}
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subroutine (SurfaceColor) vec4 Specular(){
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vec3 lightPos = vec3(10.0, 10.0, 0.0);
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vec3 L=lightPos;
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L = normalize(L);
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vec3 n = normalize(V_Normal);
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//ambient
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vec4 AmbientLightColor = vec4(0.4, 0.4, 0.4, 1.0);
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vec4 AmbientMaterial = vec4(0.2, 0.2, 0.2, 1.0);
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vec4 AmbientColor = AmbientLightColor*AmbientMaterial;
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//diffuse
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vec4 DiffuseLightColor = vec4(1.0,1.0,1.0,1.0);
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vec4 DiffuseMaterial = vec4(0.8, 0.8, 0.8, 1.0);
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vec4 diffuseColor = DiffuseLightColor*DiffuseMaterial*max(0.0, dot(L,n));
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//specular
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vec4 SpecularLightColor = vec4(1.0,1.0,1.0,1.0);
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vec4 SpecularMaterial = vec4(0.9,0.9,0.9,1.0);
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vec3 reflectDir = normalize(reflect(-L,n));//-L就是光线的入射方向向量，以法线为基础计算方式向量
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vec3 viewDir = normalize(vec3(0.0) - V_WorldPos.xyz);//vec3(0.0)表示已中心为观察点，这里求的是眼睛到物体的视线向量
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vec4 specularColor = SpecularLightColor*SpecularMaterial*pow(max(0.0,dot(viewDir,reflectDir)),128.0);
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vec4 ret = AmbientColor + texture2D(U_MainTexture, V_Texcoord) * diffuseColor + specularColor;
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return ret;
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}
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void main() {
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gl_FragColor = U_SurfaceColor();
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}
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