From 83aaee5bc4613cc677378e85cc856dd5dfda9745 Mon Sep 17 00:00:00 2001
From: SmileTheory <SmileTheory@gmail.com>
Date: Sun, 16 Mar 2014 16:29:38 -0700
Subject: OpenGL2: Parallax corrected cubemap (cheaper trick)
---
src/renderergl2/glsl/lightall_fp.glsl | 17 ++++++++++++++---
src/renderergl2/tr_glsl.c | 4 +++-
src/renderergl2/tr_local.h | 2 ++
src/renderergl2/tr_shade.c | 13 +++++++++++++
4 files changed, 32 insertions(+), 4 deletions(-)
(limited to 'src/renderergl2')
diff --git a/src/renderergl2/glsl/lightall_fp.glsl b/src/renderergl2/glsl/lightall_fp.glsl
index c74d6844..0f50a038 100644
--- a/src/renderergl2/glsl/lightall_fp.glsl
+++ b/src/renderergl2/glsl/lightall_fp.glsl
@@ -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)
diff --git a/src/renderergl2/tr_glsl.c b/src/renderergl2/tr_glsl.c
index c4a30b60..33dd0497 100644
--- a/src/renderergl2/tr_glsl.c
+++ b/src/renderergl2/tr_glsl.c
@@ -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 },
};
diff --git a/src/renderergl2/tr_local.h b/src/renderergl2/tr_local.h
index bdc55d69..26624334 100644
--- a/src/renderergl2/tr_local.h
+++ b/src/renderergl2/tr_local.h
@@ -699,6 +699,8 @@ typedef enum
UNIFORM_PRIMARYLIGHTAMBIENT,
UNIFORM_PRIMARYLIGHTRADIUS,
+ UNIFORM_CUBEMAPINFO,
+
UNIFORM_COUNT
} uniform_t;
diff --git a/src/renderergl2/tr_shade.c b/src/renderergl2/tr_shade.c
index 0925b6d6..11ba5836 100644
--- a/src/renderergl2/tr_shade.c
+++ b/src/renderergl2/tr_shade.c
@@ -1379,8 +1379,21 @@ 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
//
--
cgit