mirror of
https://github.com/UberGames/ioef.git
synced 2024-11-30 16:01:46 +00:00
OpenGL2: Revisit fragment tangent space calculation, and remove tangent space lighting.
This commit is contained in:
SmileTheory
parent
3846c115e6
commit
0e25d0357b
2 changed files with 58 additions and 45 deletions
|
|
@ -46,10 +46,15 @@ varying vec4 var_TexCoords;
|
|||
|
||||
varying vec4 var_Color;
|
||||
|
||||
#if (defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)) || defined(USE_PARALLAXMAP)
|
||||
#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_VERTEX) && !defined(USE_FAST_LIGHT)
|
||||
|
|
@ -293,6 +298,25 @@ float CalcLightAttenuation(vec3 dir, float sqrRadius)
|
|||
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()
|
||||
{
|
||||
|
|
@ -300,21 +324,26 @@ void main()
|
|||
float NL, NH, NE, EH;
|
||||
|
||||
#if (defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)) || defined(USE_PARALLAXMAP)
|
||||
#if defined(USE_VERT_TANGENT_SPACE)
|
||||
mat3 tangentToWorld = mat3(var_Tangent.xyz, var_Bitangent.xyz, var_Normal.xyz);
|
||||
#else
|
||||
mat3 tangentToWorld = cotangent_frame(var_Normal, -var_ViewDir, var_TexCoords.xy);
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#if defined(USE_DELUXEMAP)
|
||||
L = (2.0 * texture2D(u_DeluxeMap, var_TexCoords.zw).xyz - vec3(1.0));
|
||||
#if defined(USE_TANGENT_SPACE_LIGHT)
|
||||
L = L * tangentToWorld;
|
||||
#endif
|
||||
L = L * u_EnableTextures.y + var_LightDir.xyz;
|
||||
#elif defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)
|
||||
L = var_LightDir.xyz;
|
||||
#endif
|
||||
|
||||
#if (defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)) || defined(USE_PARALLAXMAP)
|
||||
#if defined(USE_VERT_TANGENT_SPACE)
|
||||
E = normalize(vec3(var_Normal.w, var_Tangent.w, var_Bitangent.w));
|
||||
#else
|
||||
E = normalize(var_ViewDir);
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#if defined(USE_LIGHTMAP)
|
||||
|
|
@ -333,11 +362,7 @@ void main()
|
|||
vec2 texCoords = var_TexCoords.xy;
|
||||
|
||||
#if defined(USE_PARALLAXMAP)
|
||||
#if defined(USE_TANGENT_SPACE_LIGHT)
|
||||
vec3 offsetDir = E;
|
||||
#else
|
||||
vec3 offsetDir = E * tangentToWorld;
|
||||
#endif
|
||||
vec3 offsetDir = normalize(E * tangentToWorld);
|
||||
|
||||
offsetDir.xy *= -0.05 / offsetDir.z;
|
||||
|
||||
|
|
@ -359,11 +384,7 @@ void main()
|
|||
#endif
|
||||
N.xy *= u_EnableTextures.x;
|
||||
N.z = sqrt(1.0 - clamp(dot(N.xy, N.xy), 0.0, 1.0));
|
||||
#if !defined(USE_TANGENT_SPACE_LIGHT)
|
||||
N = normalize(tangentToWorld * N);
|
||||
#endif
|
||||
#elif defined(USE_TANGENT_SPACE_LIGHT)
|
||||
N = vec3(0.0, 0.0, 1.0);
|
||||
#else
|
||||
N = normalize(var_Normal.xyz);
|
||||
#endif
|
||||
|
|
@ -375,11 +396,7 @@ void main()
|
|||
float shadowValue = texture2D(u_ShadowMap, shadowTex).r;
|
||||
|
||||
// surfaces not facing the light are always shadowed
|
||||
#if defined(USE_TANGENT_SPACE_LIGHT)
|
||||
shadowValue *= step(0.0, var_PrimaryLightDir.z);
|
||||
#else
|
||||
shadowValue *= step(0.0, dot(var_Normal.xyz, var_PrimaryLightDir.xyz));
|
||||
#endif
|
||||
|
||||
#if defined(SHADOWMAP_MODULATE)
|
||||
//vec3 shadowColor = min(u_PrimaryLightAmbient, lightColor);
|
||||
|
|
@ -395,12 +412,7 @@ void main()
|
|||
|
||||
#if defined(USE_LIGHTMAP) || defined(USE_LIGHT_VERTEX)
|
||||
vec3 ambientColor = lightColor;
|
||||
|
||||
#if defined(USE_TANGENT_SPACE_LIGHT)
|
||||
float surfNL = L.z;
|
||||
#else
|
||||
float surfNL = clamp(dot(var_Normal.xyz, L), 0.0, 1.0);
|
||||
#endif
|
||||
|
||||
// Scale the incoming light to compensate for the baked-in light angle
|
||||
// attenuation.
|
||||
|
|
@ -418,7 +430,7 @@ void main()
|
|||
|
||||
#if defined(USE_SPECULARMAP)
|
||||
vec4 specular = texture2D(u_SpecularMap, texCoords);
|
||||
specular = mix(vec4(1.0), specular, u_EnableTextures.z);
|
||||
specular = (specular - vec4(1.0)) * u_EnableTextures.z + vec4(1.0);
|
||||
#if defined(USE_GAMMA2_TEXTURES)
|
||||
specular.rgb *= specular.rgb;
|
||||
#endif
|
||||
|
|
@ -473,9 +485,6 @@ void main()
|
|||
reflectance = EnvironmentBRDF(gloss, NE, specular.rgb);
|
||||
|
||||
vec3 R = reflect(E, N);
|
||||
#if defined(USE_TANGENT_SPACE_LIGHT)
|
||||
R = tangentToWorld * R;
|
||||
#endif
|
||||
|
||||
vec3 cubeLightColor = textureCubeLod(u_CubeMap, R, 7.0 - gloss * 7.0).rgb * u_EnableTextures.w;
|
||||
|
||||
|
|
|
|||
|
|
@ -6,15 +6,19 @@ attribute vec4 attr_Color;
|
|||
|
||||
attribute vec3 attr_Position;
|
||||
attribute vec3 attr_Normal;
|
||||
#if defined(USE_VERT_TANGENT_SPACE)
|
||||
attribute vec3 attr_Tangent;
|
||||
attribute vec3 attr_Bitangent;
|
||||
#endif
|
||||
|
||||
#if defined(USE_VERTEX_ANIMATION)
|
||||
attribute vec3 attr_Position2;
|
||||
attribute vec3 attr_Normal2;
|
||||
#if defined(USE_VERT_TANGENT_SPACE)
|
||||
attribute vec3 attr_Tangent2;
|
||||
attribute vec3 attr_Bitangent2;
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#if defined(USE_LIGHT) && !defined(USE_LIGHT_VECTOR)
|
||||
attribute vec3 attr_LightDirection;
|
||||
|
|
@ -71,9 +75,14 @@ varying vec4 var_TexCoords;
|
|||
varying vec4 var_Color;
|
||||
|
||||
#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_VERTEX) && !defined(USE_FAST_LIGHT)
|
||||
|
|
@ -156,14 +165,18 @@ void main()
|
|||
#if defined(USE_VERTEX_ANIMATION)
|
||||
vec3 position = mix(attr_Position, attr_Position2, u_VertexLerp);
|
||||
vec3 normal = normalize(mix(attr_Normal, attr_Normal2, u_VertexLerp));
|
||||
#if defined(USE_VERT_TANGENT_SPACE)
|
||||
vec3 tangent = normalize(mix(attr_Tangent, attr_Tangent2, u_VertexLerp));
|
||||
vec3 bitangent = normalize(mix(attr_Bitangent, attr_Bitangent2, u_VertexLerp));
|
||||
#endif
|
||||
#else
|
||||
vec3 position = attr_Position;
|
||||
vec3 normal = attr_Normal;
|
||||
#if defined(USE_VERT_TANGENT_SPACE)
|
||||
vec3 tangent = attr_Tangent;
|
||||
vec3 bitangent = attr_Bitangent;
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#if defined(USE_TCGEN)
|
||||
vec2 texCoords = GenTexCoords(u_TCGen0, position, normal, u_TCGen0Vector0, u_TCGen0Vector1);
|
||||
|
|
@ -182,9 +195,11 @@ void main()
|
|||
#if defined(USE_MODELMATRIX)
|
||||
position = (u_ModelMatrix * vec4(position, 1.0)).xyz;
|
||||
normal = (u_ModelMatrix * vec4(normal, 0.0)).xyz;
|
||||
#if defined(USE_VERT_TANGENT_SPACE)
|
||||
tangent = (u_ModelMatrix * vec4(tangent, 0.0)).xyz;
|
||||
bitangent = (u_ModelMatrix * vec4(bitangent, 0.0)).xyz;
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#if defined(USE_LIGHT_VECTOR)
|
||||
vec3 L = u_LightOrigin.xyz - (position * u_LightOrigin.w);
|
||||
|
|
@ -232,26 +247,15 @@ void main()
|
|||
vec3 viewDir = u_ViewOrigin - position;
|
||||
#endif
|
||||
|
||||
#if defined(USE_TANGENT_SPACE_LIGHT)
|
||||
mat3 tangentToWorld = mat3(tangent, bitangent, normal);
|
||||
|
||||
#if defined(USE_PRIMARY_LIGHT) || defined(USE_SHADOWMAP)
|
||||
var_PrimaryLightDir.xyz = var_PrimaryLightDir.xyz * tangentToWorld;
|
||||
#endif
|
||||
|
||||
#if defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)
|
||||
var_LightDir.xyz = var_LightDir.xyz * tangentToWorld;
|
||||
#endif
|
||||
|
||||
#if defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)
|
||||
viewDir = viewDir * tangentToWorld;
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#if defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)
|
||||
#if defined(USE_VERT_TANGENT_SPACE)
|
||||
// store view direction in tangent space to save on varyings
|
||||
var_Normal = vec4(normal, viewDir.x);
|
||||
var_Tangent = vec4(tangent, viewDir.y);
|
||||
var_Bitangent = vec4(bitangent, viewDir.z);
|
||||
#else
|
||||
var_Normal = normal;
|
||||
var_ViewDir = viewDir;
|
||||
#endif
|
||||
#endif
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue