97 lines
2.7 KiB
Plaintext
97 lines
2.7 KiB
Plaintext
const float CONSTANT_ATTENUATION = 1.0;
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const float LINEAR_ATTENUATION = 0.0;
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const float QUADRATIC_ATTENUATION = 1.0;
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in vec3 position;
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in vec2 texcoord;
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in vec4 color;
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in vec3 normal;
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uniform highp mat4 modelMatrix;
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uniform highp mat4 viewMatrix;
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uniform highp mat4 projMatrix;
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uniform highp mat4 extraMatrix;
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uniform UBOOL textured;
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uniform UBOOL lightsEnabled;
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uniform highp vec2 texScale;
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const int maxLights = 8;
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uniform vec4 lightsPosition[maxLights];
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uniform vec4 lightsDirection[maxLights];
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uniform vec4 lightsColor[maxLights];
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uniform vec4 lightsParams[maxLights];
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struct shadow_info {
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UBOOL _active;
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vec3 _color;
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vec3 _light;
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vec3 _point;
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vec3 _normal;
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};
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uniform shadow_info shadow;
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out vec2 Texcoord;
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out vec4 Color;
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void main() {
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vec4 pos = modelMatrix * extraMatrix * vec4(position, 1.0);
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// See http://en.wikipedia.org/wiki/Line-plane_intersection
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if (UBOOL_TEST(shadow._active)) {
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pos /= pos.w;
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vec3 l = pos.xyz - shadow._light;
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float d = dot(shadow._point - shadow._light, shadow._normal) / dot(l, shadow._normal);
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vec3 p = shadow._light + d * l;
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pos = vec4(p, 1.0);
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}
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vec4 positionView = viewMatrix * pos;
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gl_Position = projMatrix * positionView;
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if (UBOOL_TEST(shadow._active)) {
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Color = vec4(shadow._color, 1.0);
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} else {
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Color = color;
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}
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if (UBOOL_TEST(textured)) {
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Texcoord = vec2(0.0, 1.0) + (texcoord / texScale);
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} else {
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Texcoord = vec2(0.0, 0.0);
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}
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vec3 light = vec3(0.0, 0.0, 0.0);
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vec3 normalEye = normalize((viewMatrix * (modelMatrix * extraMatrix * vec4(normal, 0.0))).xyz);
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for (int i = 0; i < maxLights; ++i) {
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float intensity = lightsColor[i].w;
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float light_type = lightsPosition[i].w;
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if (light_type >= 0.0) { // Not ambient
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vec3 vertexToLight = lightsPosition[i].xyz;
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if (light_type > 0.0) { // positional light
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vertexToLight -= positionView.xyz;
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float dist = length(vertexToLight);
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intensity /= CONSTANT_ATTENUATION + dist * (LINEAR_ATTENUATION + dist * QUADRATIC_ATTENUATION);
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if (lightsDirection[i].w > -1.0) { // Spotlight
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// See DirectX spotlight documentation
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float cosAngle = -dot(normalize(vertexToLight), normalize(lightsDirection[i].xyz)); // rho
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float cosPenumbra = clamp(lightsParams[i].w, 0.0, 1.0); // cos(theta / 2)
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float cosUmbra = clamp(lightsParams[i].z, 0.0, cosPenumbra); // cos(phi / 2)
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if (cosAngle <= cosPenumbra) {
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if (cosAngle < cosUmbra || cosPenumbra == cosUmbra) {
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intensity = 0.0;
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} else {
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intensity *= (cosAngle - cosUmbra) / (cosPenumbra - cosUmbra);
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}
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}
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}
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}
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intensity *= max(0.0, dot(normalEye, normalize(vertexToLight)));
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}
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light += lightsColor[i].xyz * intensity;
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}
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light /= max(1.0, max(max(light.x, light.y), light.z));
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Color *= vec4(light, 1.0);
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}
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