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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2014 Blender Foundation.
* All rights reserved.
*
* Contributor(s): Sergey Sharybin
*
* ***** END GPL LICENSE BLOCK *****
*/
struct VertexData {
vec4 position;
vec3 normal;
vec2 uv;
};
#define MAX_LIGHTS 8
#define NUM_SOLID_LIGHTS 3
struct LightSource {
vec4 position;
vec4 ambient;
vec4 diffuse;
vec4 specular;
vec4 spotDirection;
#ifdef SUPPORT_COLOR_MATERIAL
float constantAttenuation;
float linearAttenuation;
float quadraticAttenuation;
float spotCutoff;
float spotExponent;
float spotCosCutoff;
float pad, pad2;
#endif
};
layout(std140) uniform Lighting {
LightSource lightSource[MAX_LIGHTS];
int num_enabled_lights;
};
uniform vec4 diffuse;
uniform vec4 specular;
uniform float shininess;
uniform sampler2D texture_buffer;
in block {
VertexData v;
} inpt;
void main()
{
#ifdef WIREFRAME
gl_FragColor = diffuse;
#else
vec3 N = inpt.v.normal;
if (!gl_FrontFacing)
N = -N;
/* Compute diffuse and specular lighting. */
vec3 L_diffuse = vec3(0.0);
vec3 L_specular = vec3(0.0);
#ifdef USE_LIGHTING
#ifndef USE_COLOR_MATERIAL
/* Assume NUM_SOLID_LIGHTS directional lights. */
for (int i = 0; i < NUM_SOLID_LIGHTS; i++) {
vec4 Plight = lightSource[i].position;
#ifdef USE_DIRECTIONAL_LIGHT
vec3 l = (Plight.w == 0.0)
? normalize(Plight.xyz)
: normalize(inpt.v.position.xyz);
#else /* USE_DIRECTIONAL_LIGHT */
/* TODO(sergey): We can normalize it outside of the shader. */
vec3 l = normalize(Plight.xyz);
#endif /* USE_DIRECTIONAL_LIGHT */
vec3 h = normalize(l + vec3(0, 0, 1));
float d = max(0.0, dot(N, l));
float s = pow(max(0.0, dot(N, h)), shininess);
L_diffuse += d * lightSource[i].diffuse.rgb;
L_specular += s * lightSource[i].specular.rgb;
}
#else /* USE_COLOR_MATERIAL */
vec3 varying_position = inpt.v.position.xyz;
vec3 V = (gl_ProjectionMatrix[3][3] == 0.0) ?
normalize(varying_position) : vec3(0.0, 0.0, -1.0);
for (int i = 0; i < num_enabled_lights; i++) {
/* todo: this is a slow check for disabled lights */
if (lightSource[i].specular.a == 0.0)
continue;
float intensity = 1.0;
vec3 light_direction;
if (lightSource[i].position.w == 0.0) {
/* directional light */
light_direction = lightSource[i].position.xyz;
}
else {
/* point light */
vec3 d = lightSource[i].position.xyz - varying_position;
light_direction = normalize(d);
/* spot light cone */
if (lightSource[i].spotCutoff < 90.0) {
float cosine = max(dot(light_direction,
-lightSource[i].spotDirection.xyz),
0.0);
intensity = pow(cosine, lightSource[i].spotExponent);
intensity *= step(lightSource[i].spotCosCutoff, cosine);
}
/* falloff */
float distance = length(d);
intensity /= lightSource[i].constantAttenuation +
lightSource[i].linearAttenuation * distance +
lightSource[i].quadraticAttenuation * distance * distance;
}
/* diffuse light */
vec3 light_diffuse = lightSource[i].diffuse.rgb;
float diffuse_bsdf = max(dot(N, light_direction), 0.0);
L_diffuse += light_diffuse * diffuse_bsdf * intensity;
/* specular light */
vec3 light_specular = lightSource[i].specular.rgb;
vec3 H = normalize(light_direction - V);
float specular_bsdf = pow(max(dot(N, H), 0.0),
gl_FrontMaterial.shininess);
L_specular += light_specular * specular_bsdf * intensity;
}
#endif /* USE_COLOR_MATERIAL */
#else /* USE_LIGHTING */
L_diffuse = vec3(1.0);
#endif
/* Compute diffuse color. */
#ifdef USE_TEXTURE_2D
L_diffuse *= texture2D(texture_buffer, inpt.v.uv).rgb;
#else
L_diffuse *= diffuse.rgb;
#endif
/* Sum lighting. */
vec3 L = L_diffuse;
if (shininess != 0) {
L += L_specular * specular.rgb;
}
/* Write out fragment color. */
gl_FragColor = vec4(L, diffuse.a);
#endif
}
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