90 lines
3.3 KiB
Plaintext
90 lines
3.3 KiB
Plaintext
|
Copyright (c) 2006-2007 dhpoware. All Rights Reserved.
|
||
|
|
|
||
|
|
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.
|
||
|
|
|
||
|
|
-------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
Tangent space normal mapping shader for a single directional light source.
|
||
|
|
|
||
|
|
The tangent vector is passed to the vertex shader in gl_MultiTexCoord1. The
|
||
|
|
tangent vector is assumed to be a four component vector. The tangent vector's
|
||
|
|
w component indicates the handedness of the local tangent space at this vertex.
|
||
|
|
The handedness is used to calculate the bitangent vector. The reason for the
|
||
|
|
inclusion of the handedness component is to allow for triangles with mirrored
|
||
|
|
texture mappings.
|
||
|
|
|
||
|
|
-------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
[vert]
|
||
|
|
|
||
|
|
#version 110
|
||
|
|
|
||
|
|
varying vec3 lightDir;
|
||
|
|
varying vec3 halfVector;
|
||
|
|
|
||
|
|
void main()
|
||
|
|
{
|
||
|
|
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
|
||
|
|
gl_TexCoord[0] = gl_MultiTexCoord0;
|
||
|
|
|
||
|
|
vec3 n = normalize(gl_NormalMatrix * gl_Normal);
|
||
|
|
vec3 t = normalize(gl_NormalMatrix * gl_MultiTexCoord1.xyz);
|
||
|
|
vec3 b = cross(n, t) * gl_MultiTexCoord1.w;
|
||
|
|
|
||
|
|
mat3 tbnMatrix = mat3(t.x, b.x, n.x,
|
||
|
|
t.y, b.y, n.y,
|
||
|
|
t.z, b.z, n.z);
|
||
|
|
|
||
|
|
lightDir = gl_LightSource[0].position.xyz;
|
||
|
|
lightDir = tbnMatrix * lightDir;
|
||
|
|
|
||
|
|
halfVector = gl_LightSource[0].halfVector.xyz;
|
||
|
|
halfVector = tbnMatrix * halfVector;
|
||
|
|
}
|
||
|
|
|
||
|
|
[frag]
|
||
|
|
|
||
|
|
#version 110
|
||
|
|
|
||
|
|
uniform sampler2D colorMap;
|
||
|
|
uniform sampler2D normalMap;
|
||
|
|
uniform float materialAlpha;
|
||
|
|
|
||
|
|
varying vec3 lightDir;
|
||
|
|
varying vec3 halfVector;
|
||
|
|
|
||
|
|
void main()
|
||
|
|
{
|
||
|
|
vec3 n = normalize(texture2D(normalMap, gl_TexCoord[0].st).rgb * 2.0 - 1.0);
|
||
|
|
vec3 l = normalize(lightDir);
|
||
|
|
vec3 h = normalize(halfVector);
|
||
|
|
|
||
|
|
float nDotL = max(0.0, dot(n, l));
|
||
|
|
float nDotH = max(0.0, dot(n, h));
|
||
|
|
float power = (nDotL == 0.0) ? 0.0 : pow(nDotH, gl_FrontMaterial.shininess);
|
||
|
|
|
||
|
|
vec4 ambient = gl_FrontLightProduct[0].ambient;
|
||
|
|
vec4 diffuse = gl_FrontLightProduct[0].diffuse * nDotL;
|
||
|
|
vec4 specular = gl_FrontLightProduct[0].specular * power;
|
||
|
|
vec4 color = gl_FrontLightModelProduct.sceneColor + ambient + diffuse + specular;
|
||
|
|
|
||
|
|
gl_FragColor = color * texture2D(colorMap, gl_TexCoord[0].st);
|
||
|
|
gl_FragColor.a = materialAlpha;
|
||
|
|
}
|