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OpenGL2: Parallax corrected cubemap (cheaper trick)

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This commit is contained in:
SmileTheory 2014-03-16 16:29:38 -07:00
parent d0d1883895
commit 375f6247d4
4 changed files with 32 additions and 4 deletions
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17
code/renderergl2/glsl/lightall_fp.glsl
View file

@ -44,6 +44,12 @@ uniform vec4 u_NormalScale;
uniform vec4 u_SpecularScale;
#endif
#if defined(USE_LIGHT) && !defined(USE_FAST_LIGHT)
#if defined(USE_CUBEMAP)
uniform vec4 u_CubeMapInfo;
#endif
#endif
varying vec4 var_TexCoords;
varying vec4 var_Color;
@ -323,19 +329,20 @@ mat3 cotangent_frame( vec3 N, vec3 p, vec2 uv )
void main()
{
vec3 viewDir;
vec3 L, N, E, H;
float NL, NH, NE, EH;
#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);
E = vec3(var_Normal.w, var_Tangent.w, var_Bitangent.w);
viewDir = vec3(var_Normal.w, var_Tangent.w, var_Bitangent.w);
#else
mat3 tangentToWorld = cotangent_frame(var_Normal, -var_ViewDir, var_TexCoords.xy);
E = var_ViewDir;
viewDir = var_ViewDir;
#endif
E = normalize(E);
E = normalize(viewDir);
L = var_LightDir.xyz;
#if defined(USE_DELUXEMAP)
@ -497,6 +504,10 @@ void main()
vec3 R = reflect(E, N);
// parallax corrected cubemap (cheaper trick)
// from http://seblagarde.wordpress.com/2012/09/29/image-based-lighting-approaches-and-parallax-corrected-cubemap/
R += u_CubeMapInfo.xyz + u_CubeMapInfo.w * viewDir;
vec3 cubeLightColor = textureCubeLod(u_CubeMap, R, 7.0 - gloss * 7.0).rgb * u_EnableTextures.w;
#if defined(USE_LIGHTMAP)

4
code/renderergl2/tr_glsl.c
View file

@ -142,7 +142,9 @@ static uniformInfo_t uniformsInfo[] =
{ "u_PrimaryLightOrigin", GLSL_VEC4 },
{ "u_PrimaryLightColor", GLSL_VEC3 },
{ "u_PrimaryLightAmbient", GLSL_VEC3 },
{ "u_PrimaryLightRadius", GLSL_FLOAT }
{ "u_PrimaryLightRadius", GLSL_FLOAT },
{ "u_CubeMapInfo", GLSL_VEC4 },
};

2
code/renderergl2/tr_local.h
View file

@ -698,6 +698,8 @@ typedef enum
UNIFORM_PRIMARYLIGHTAMBIENT,
UNIFORM_PRIMARYLIGHTRADIUS,
UNIFORM_CUBEMAPINFO,
UNIFORM_COUNT
} uniform_t;

13
code/renderergl2/tr_shade.c
View file

@ -1378,8 +1378,21 @@ static void RB_IterateStagesGeneric( shaderCommands_t *input )
// testing cube map
//
if (!(tr.viewParms.flags & VPF_NOCUBEMAPS) && input->cubemapIndex && r_cubeMapping->integer)
{
vec4_t vec;
GL_BindToTMU( tr.cubemaps[input->cubemapIndex - 1], TB_CUBEMAP);
vec[0] = tr.cubemapOrigins[input->cubemapIndex - 1][0] - backEnd.viewParms.or.origin[0];
vec[1] = tr.cubemapOrigins[input->cubemapIndex - 1][1] - backEnd.viewParms.or.origin[1];
vec[2] = tr.cubemapOrigins[input->cubemapIndex - 1][2] - backEnd.viewParms.or.origin[2];
vec[3] = 1.0f;
VectorScale4(vec, 1.0f / 1000.0f, vec);
GLSL_SetUniformVec4(sp, UNIFORM_CUBEMAPINFO, vec);
}
//
// draw
//