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OpenGL2: Remove per fragment tangent space calculation code.

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This commit is contained in:
SmileTheory 2016-09-14 03:57:51 -07:00
parent 4faf1008a0
commit 8749d62bbd
13 changed files with 5 additions and 130 deletions
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29
code/renderergl2/glsl/lightall_fp.glsl
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@ -53,14 +53,9 @@ varying vec4 var_ColorAmbient;
#endif
#if (defined(USE_LIGHT) && !defined(USE_FAST_LIGHT))
#if defined(USE_VERT_TANGENT_SPACE)
varying vec4 var_Normal;
varying vec4 var_Tangent;
varying vec4 var_Bitangent;
#else
varying vec3 var_Normal;
varying vec3 var_ViewDir;
#endif
#endif
#if defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)
@ -196,25 +191,6 @@ float CalcLightAttenuation(float point, float normDist)
return attenuation;
}
// from http://www.thetenthplanet.de/archives/1180
mat3 cotangent_frame( vec3 N, vec3 p, vec2 uv )
{
// get edge vectors of the pixel triangle
vec3 dp1 = dFdx( p );
vec3 dp2 = dFdy( p );
vec2 duv1 = dFdx( uv );
vec2 duv2 = dFdy( uv );
// solve the linear system
vec3 dp2perp = cross( dp2, N );
vec3 dp1perp = cross( N, dp1 );
vec3 T = dp2perp * duv1.x + dp1perp * duv2.x;
vec3 B = dp2perp * duv1.y + dp1perp * duv2.y;
// construct a scale-invariant frame
float invmax = inversesqrt( max( dot(T,T), dot(B,B) ) );
return mat3( T * invmax, B * invmax, N );
}
void main()
{
@ -223,13 +199,8 @@ void main()
float NL, NH, NE, EH, attenuation;
#if defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)
#if defined(USE_VERT_TANGENT_SPACE)
mat3 tangentToWorld = mat3(var_Tangent.xyz, var_Bitangent.xyz, var_Normal.xyz);
viewDir = vec3(var_Normal.w, var_Tangent.w, var_Bitangent.w);
#else
mat3 tangentToWorld = cotangent_frame(var_Normal, -var_ViewDir, var_TexCoords.xy);
viewDir = var_ViewDir;
#endif
E = normalize(viewDir);
#endif