59 lines
1.7 KiB
Plaintext
59 lines
1.7 KiB
Plaintext
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#version 430
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layout(binding = 0) uniform sampler2D diffuse_tex;
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layout(location = 1) uniform float time;
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layout(std140, binding = 0) uniform SceneUniforms
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{
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mat4 PV; //camera projection * view matrix
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vec4 eye_w; //world-space eye position
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};
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layout(std140, binding = 1) uniform LightUniforms
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{
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vec4 La; //ambient light color
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vec4 Ld; //diffuse light color
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vec4 Ls; //specular light color
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vec4 light_w; //world-space light position
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};
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layout(std140, binding = 2) uniform MaterialUniforms
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{
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vec4 ka; //ambient material color
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vec4 kd; //diffuse material color
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vec4 ks; //specular material color
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float shininess; //specular exponent
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};
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in VertexData
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{
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vec2 tex_coord;
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vec3 pw; //world-space vertex position
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vec3 nw; //world-space normal vector
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} inData; //block is named 'inData'
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out vec4 fragcolor; //the output color for this fragment
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void main(void)
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{
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//Compute per-fragment Phong lighting
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vec4 ktex = texture(diffuse_tex, inData.tex_coord);
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vec4 ambient_term = ka*ktex*La;
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const float eps = 1e-8; //small value to avoid division by 0
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float d = distance(light_w.xyz, inData.pw.xyz);
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float atten = 1.0/(d*d+eps); //d-squared attenuation
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vec3 nw = normalize(inData.nw); //world-space unit normal vector
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vec3 lw = normalize(light_w.xyz - inData.pw.xyz); //world-space unit light vector
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vec4 diffuse_term = atten*kd*ktex*Ld*max(0.0, dot(nw, lw));
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vec3 vw = normalize(eye_w.xyz - inData.pw.xyz); //world-space unit view vector
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vec3 rw = reflect(-lw, nw); //world-space unit reflection vector
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vec4 specular_term = atten*ks*Ls*pow(max(0.0, dot(rw, vw)), shininess);
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fragcolor = ambient_term + diffuse_term + specular_term;
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}
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