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https://gitcode.com/gh_mirrors/le/LearnOpenGLProject.git
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47 lines
1.4 KiB
GLSL
47 lines
1.4 KiB
GLSL
#version 330 core
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out vec4 FragColor;
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in VS_OUT{
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vec3 FragPos;
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vec3 Normal;
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vec2 TexCoords;
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}fs_in;
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uniform sampler2D floorTexture;
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uniform vec3 lightPos;
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uniform vec3 viewPos;
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uniform bool blinn;
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void main()
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{
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// 采样纹理作为光照颜色
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vec3 color = texture(floorTexture, fs_in.TexCoords).rgb;
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// 环境光
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float ambientStrength = 0.05;
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vec3 ambient = ambientStrength * color;
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// 漫反射
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vec3 lightDir = normalize(lightPos - fs_in.FragPos);
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vec3 normal = normalize(fs_in.Normal);
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float diff = max(dot(normal, lightDir), 0.0);
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vec3 diffuse = diff * color;
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// 环境光照
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vec3 viewDir = normalize(viewPos - fs_in.FragPos); // 是观察者方向，不是观察者看向的方向
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float spec = 0.0;
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if(blinn){
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// blinn-pong：半程方向向量与法线方向向量的点积
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// 半程向量
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vec3 halfwayDir = normalize(lightDir + viewDir);
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spec = pow(max(dot(normal, halfwayDir), 0.0), 1);
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}
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else
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{
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// pong：观察者方向向量与反射方向向量的点积
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vec3 reflectDir = reflect(-lightDir, normal);
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spec = pow(max(dot(viewDir, reflectDir), 0.0), 1);
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}
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float specularStrength = 0.3;
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vec3 specular = specularStrength * spec * vec3(1);// 不像漫反射需要乘以纹理颜色，而是乘以1，表示镜面光的颜色为白色
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FragColor = vec4(ambient + diffuse + specular, 1.0);
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// FragColor = vec4(diffuse + specular, 1.0);
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// FragColor = vec4(1.0);
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} |