93 lines
2.7 KiB
Plaintext
93 lines
2.7 KiB
Plaintext
in vec3 position;
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in vec3 normal;
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in vec3 texcoord;
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out vec2 Texcoord;
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out vec3 Color;
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struct Light {
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vec4 position;
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vec3 direction;
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vec3 color;
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vec4 params;
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};
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const int lightTypePoint = 1;
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const int lightTypeDirectional = 2;
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const int lightTypeSpot = 4;
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const int maxLights = 10;
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uniform mat4 modelViewMatrix;
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uniform mat4 projectionMatrix;
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uniform mat3 normalMatrix;
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uniform UBOOL doubleSided;
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uniform vec3 ambientColor;
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uniform Light lights[maxLights];
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vec4 eyePosition;
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vec3 eyeNormal;
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vec3 pointLight(vec3 position, vec3 color, float falloffNear, float falloffFar) {
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vec3 vertexToLight = position - eyePosition.xyz;
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float dist = length(vertexToLight);
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float attn = clamp((falloffFar - dist) / max(0.001, falloffFar - falloffNear), 0.0, 1.0);
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vertexToLight = normalize(vertexToLight);
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float incidence = max(0.0, dot(eyeNormal, vertexToLight));
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return color * attn * incidence;
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}
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vec3 directionalLight(vec3 direction, vec3 color) {
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float incidence = max(0.0, dot(eyeNormal, -direction));
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return color * incidence;
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}
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vec3 spotLight(vec3 position, vec3 color, float falloffNear, float falloffFar, vec3 direction, float cosInnerAngle, float cosOuterAngle) {
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vec3 vertexToLight = position - eyePosition.xyz;
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float dist = length(vertexToLight);
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float attn = clamp((falloffFar - dist) / max(0.001, falloffFar - falloffNear), 0.0, 1.0);
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vertexToLight = normalize(vertexToLight);
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float incidence = max(0.0, dot(eyeNormal, vertexToLight));
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float cosAngle = max(0.0, dot(vertexToLight, -direction));
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float cone = clamp((cosAngle - cosInnerAngle) / max(0.001, cosOuterAngle - cosInnerAngle), 0.0, 1.0);
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return color * attn * incidence * cone;
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}
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void main() {
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if (UBOOL_TEST(doubleSided)) {
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Texcoord = vec2(texcoord.x, 1.0 - texcoord.y);
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} else {
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Texcoord = vec2(1.0 - texcoord.x, 1.0 - texcoord.y);
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}
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// Compute the vertex position in screen-space
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eyePosition = modelViewMatrix * vec4(position.xyz, 1.0);
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eyeNormal = normalMatrix * normal;
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eyeNormal = normalize(eyeNormal);
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gl_Position = projectionMatrix * eyePosition;
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// Shade the vertex color according to the lights
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vec3 lightColor = ambientColor;
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for (int i = 0; i < maxLights; i++) {
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int type = int(lights[i].position.w);
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if (type == lightTypePoint) {
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lightColor += pointLight(lights[i].position.xyz, lights[i].color, lights[i].params.x, lights[i].params.y);
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} else if (type == lightTypeDirectional) {
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lightColor += directionalLight(lights[i].direction, lights[i].color);
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} else if (type == lightTypeSpot) {
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lightColor += spotLight(lights[i].position.xyz, lights[i].color, lights[i].params.x, lights[i].params.y,
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lights[i].direction, lights[i].params.z, lights[i].params.w);
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}
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}
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Color = clamp(lightColor, 0.0, 1.0);
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}
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