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/**
* @file alphaV.glsl
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2007, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
uniform mat3 normal_matrix;
uniform mat4 texture_matrix0;
uniform mat4 projection_matrix;
uniform mat4 modelview_matrix;
uniform mat4 modelview_projection_matrix;
ATTRIBUTE vec3 position;
#ifdef USE_INDEXED_TEX
void passTextureIndex();
#endif
ATTRIBUTE vec3 normal;
#ifdef USE_VERTEX_COLOR
ATTRIBUTE vec4 diffuse_color;
#endif
ATTRIBUTE vec2 texcoord0;
#ifdef HAS_SKIN
mat4 getObjectSkinnedTransform();
#else
#ifdef IS_AVATAR_SKIN
mat4 getSkinnedTransform();
#endif
#endif
vec4 calcLighting(vec3 pos, vec3 norm, vec4 color, vec4 baseCol);
void calcAtmospherics(vec3 inPositionEye);
vec3 calcDirectionalLight(vec3 n, vec3 l);
vec3 atmosAmbient(vec3 light);
vec3 atmosAffectDirectionalLight(float lightIntensity);
vec3 scaleDownLight(vec3 light);
vec3 scaleUpLight(vec3 light);
VARYING vec3 vary_ambient;
VARYING vec3 vary_directional;
VARYING vec3 vary_fragcoord;
VARYING vec3 vary_position;
VARYING vec3 vary_pointlight_col;
#ifdef USE_VERTEX_COLOR
VARYING vec4 vertex_color;
#endif
VARYING vec2 vary_texcoord0;
VARYING vec3 vary_norm;
uniform float near_clip;
uniform float shadow_offset;
uniform float shadow_bias;
uniform vec4 light_position[8];
uniform vec3 light_direction[8];
uniform vec3 light_attenuation[8];
uniform vec3 light_diffuse[8];
uniform vec3 sun_dir;
vec3 calcDirectionalLight(vec3 n, vec3 l)
{
float a = max(dot(n,l),0.0);
return vec3(a,a,a);
}
vec3 calcPointLightOrSpotLight(vec3 v, vec3 n, vec4 lp, vec3 ln, float la, float fa, float is_pointlight)
{
//get light vector
vec3 lv = lp.xyz-v;
//get distance
float d = dot(lv,lv);
float da = 0.0;
if (d > 0.0 && la > 0.0 && fa > 0.0)
{
//normalize light vector
lv = normalize(lv);
//distance attenuation
float dist2 = d/la;
da = clamp(1.0-(dist2-1.0*(1.0-fa))/fa, 0.0, 1.0);
// spotlight coefficient.
float spot = max(dot(-ln, lv), is_pointlight);
da *= spot*spot; // GL_SPOT_EXPONENT=2
//angular attenuation
da *= max(dot(n, lv), 0.0);
}
return vec3(da,da,da);
}
void main()
{
vec4 pos;
vec3 norm;
//transform vertex
#ifdef HAS_SKIN
mat4 trans = getObjectSkinnedTransform();
trans = modelview_matrix * trans;
pos = trans * vec4(position.xyz, 1.0);
norm = position.xyz + normal.xyz;
norm = normalize((trans * vec4(norm, 1.0)).xyz - pos.xyz);
vec4 frag_pos = projection_matrix * pos;
gl_Position = frag_pos;
#else
#ifdef IS_AVATAR_SKIN
mat4 trans = getSkinnedTransform();
vec4 pos_in = vec4(position.xyz, 1.0);
pos.x = dot(trans[0], pos_in);
pos.y = dot(trans[1], pos_in);
pos.z = dot(trans[2], pos_in);
pos.w = 1.0;
norm.x = dot(trans[0].xyz, normal);
norm.y = dot(trans[1].xyz, normal);
norm.z = dot(trans[2].xyz, normal);
norm = normalize(norm);
vec4 frag_pos = projection_matrix * pos;
gl_Position = frag_pos;
#else
norm = normalize(normal_matrix * normal);
vec4 vert = vec4(position.xyz, 1.0);
pos = (modelview_matrix * vert);
gl_Position = modelview_projection_matrix*vec4(position.xyz, 1.0);
#endif
#endif
#ifdef USE_INDEXED_TEX
passTextureIndex();
vary_texcoord0 = (texture_matrix0 * vec4(texcoord0,0,1)).xy;
#else
vary_texcoord0 = texcoord0;
#endif
vary_norm = norm;
float dp_directional_light = max(0.0, dot(norm, light_position[0].xyz));
vary_position = pos.xyz + light_position[0].xyz * (1.0-dp_directional_light)*shadow_offset;
calcAtmospherics(pos.xyz);
#ifndef USE_VERTEX_COLOR
vec4 diffuse_color = vec4(1,1,1,1);
#endif
//vec4 color = calcLighting(pos.xyz, norm, diffuse_color, vec4(0.));
vec4 col = vec4(0.0, 0.0, 0.0, diffuse_color.a);
vec3 dff = pow(diffuse_color.rgb, vec3(2.2f,2.2f,2.2f));
vary_pointlight_col = dff;
col.rgb = vec3(0,0,0);
// Add windlight lights
col.rgb = atmosAmbient(col.rgb);
float ambient = min(abs(dot(norm.xyz, sun_dir.xyz)), 1.0);
ambient *= 0.5;
ambient *= ambient;
ambient = (1.0-ambient);
col.rgb *= ambient;
vary_directional.rgb = atmosAffectDirectionalLight(1.0f);
vary_ambient = col.rgb*dff;
col.rgb = col.rgb*dff;
#ifdef USE_VERTEX_COLOR
vertex_color = col;
#endif
#ifdef HAS_SKIN
vary_fragcoord.xyz = frag_pos.xyz + vec3(0,0,near_clip);
#else
#ifdef IS_AVATAR_SKIN
vary_fragcoord.xyz = pos.xyz + vec3(0,0,near_clip);
#else
pos = modelview_projection_matrix * vert;
vary_fragcoord.xyz = pos.xyz + vec3(0,0,near_clip);
#endif
#endif
}
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