GlobalLight_ps.glsl
资源名称:3dwind2.0.rar [点击查看]
上传用户:xhbjoy
上传日期:2014-10-07
资源大小:38068k
文件大小:3k
源码类别:
游戏引擎
开发平台:
Visual C++
- /******************************************************************************
- Copyright (c) W.J. van der Laan
- Permission is hereby granted, free of charge, to any person obtaining a copy of
- this software and associated documentation files (the "Software"), to deal in
- the Software without restriction, including without limitation the rights to use,
- copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
- Software, and to permit persons to whom the Software is furnished to do so, subject
- to the following conditions:
- The above copyright notice and this permission notice shall be included in all copies
- or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
- INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
- PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
- HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,OUT OF OR IN CONNECTION WITH THE
- SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- ******************************************************************************/
- /** Deferred shading framework
- // W.J. :wumpus: van der Laan 2005 //
- Post shader: Multipass, one light
- */
- uniform sampler2D tex0;
- uniform sampler2D tex1;
- varying vec2 texCoord;
- varying vec3 projCoord;
- // Attributes of light
- uniform vec4 lightPos0;
- uniform vec3 lightDiffuseColor0;
- uniform vec3 lightSpecularColor0;
- // Global parameters for lights
- struct LightGlobal
- {
- vec3 position;
- vec3 normal;
- vec3 viewDir;
- };
- // Current state of light
- struct LightAccum
- {
- vec3 light_diffuse;
- vec3 light_specular;
- };
- // Do lighting calculations for one light
- void processLight(
- inout LightAccum accum,
- LightGlobal global,
- vec4 lightPos,
- vec3 lightDiffuseColor,
- vec3 lightSpecularColor)
- {
- vec3 lightVec = vec3(lightPos) - global.position;
- vec3 lightDir = normalize(lightVec);
- accum.light_diffuse += max(0.0,dot(lightDir, global.normal)) * lightDiffuseColor;
- vec3 h = normalize(global.viewDir + lightDir);
- accum.light_specular += pow(dot(global.normal, h),32.0) * lightSpecularColor;
- }
- void main()
- {
- vec4 a0 = texture2D(tex0, texCoord); // Attribute 0: Diffuse color+shininess
- vec4 a1 = texture2D(tex1, texCoord); // Attribute 1: Normal+depth
- // Attributes
- vec3 colour = a0.rgb;
- float alpha = a0.a; // Specularity
- float distance = a1.w; // Distance from viewer -- is zero if no lighting wanted
- LightGlobal global;
- global.normal = a1.xyz;
- global.position = projCoord*distance;
- // Apply light
- LightAccum accum;
- accum.light_diffuse = vec3(0,0,0);
- accum.light_specular = vec3(0,0,0);
- global.viewDir = -normalize(global.position);
- processLight(accum, global, lightPos0, lightDiffuseColor0, lightSpecularColor0);
- // Calcalate total lighting for this fragment
- vec3 total_light_contrib;
- total_light_contrib = accum.light_diffuse+alpha*accum.light_specular;
- // Calculate colour of fragment
- gl_FragColor = vec4( total_light_contrib*colour ,0);
- }