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