add cvars r_glsl_offsetmapping_steps and r_glsl_offsetmapping_reliefmapping_steps

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@10922 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/dpsoftrast.h b/dpsoftrast.h
index 302d5cf28da625ad51bf29a3109815ce0cd9a229..15f4a8c83b58ad54f9fa64a9ea6acdacf9c9990a 100644 (file)
--- a/dpsoftrast.h
+++ b/dpsoftrast.h
@@ -252,7 +252,7 @@ typedef enum DPSOFTRAST_UNIFORM_e
        DPSOFTRAST_UNIFORM_LightColor,
        DPSOFTRAST_UNIFORM_LightDir,
        DPSOFTRAST_UNIFORM_LightPosition,
-       DPSOFTRAST_UNIFORM_OffsetMapping_Scale,
+       DPSOFTRAST_UNIFORM_OffsetMapping_ScaleSteps,
        DPSOFTRAST_UNIFORM_PixelSize,
        DPSOFTRAST_UNIFORM_ReflectColor,
        DPSOFTRAST_UNIFORM_ReflectFactor,

diff --git a/gl_rmain.c b/gl_rmain.c
index a4467e58a57f1809ccbc320602893d7bf9cf214b..dbbb262564a14891956b1e3e80c2a7ae174fe9b7 100644 (file)
--- a/gl_rmain.c
+++ b/gl_rmain.c
@@ -142,7 +142,9 @@ static cvar_t r_glsl = {CVAR_READONLY, "r_glsl", "1", "indicates whether the Ope
 
 cvar_t r_glsl_deluxemapping = {CVAR_SAVE, "r_glsl_deluxemapping", "1", "use per pixel lighting on deluxemap-compiled q3bsp maps (or a value of 2 forces deluxemap shading even without deluxemaps)"};
 cvar_t r_glsl_offsetmapping = {CVAR_SAVE, "r_glsl_offsetmapping", "0", "offset mapping effect (also known as parallax mapping or virtual displacement mapping)"};
+cvar_t r_glsl_offsetmapping_steps = {CVAR_SAVE, "r_glsl_offsetmapping_steps", "2", "offset mapping steps (note: too high values may be not supported by your GPU)"};
 cvar_t r_glsl_offsetmapping_reliefmapping = {CVAR_SAVE, "r_glsl_offsetmapping_reliefmapping", "0", "relief mapping effect (higher quality)"};
+cvar_t r_glsl_offsetmapping_reliefmapping_steps = {CVAR_SAVE, "r_glsl_offsetmapping_reliefmapping_steps", "10", "relief mapping steps (note: too high values may be not supported by your GPU)"};
 cvar_t r_glsl_offsetmapping_scale = {CVAR_SAVE, "r_glsl_offsetmapping_scale", "0.04", "how deep the offset mapping effect is"};
 cvar_t r_glsl_postprocess = {CVAR_SAVE, "r_glsl_postprocess", "0", "use a GLSL postprocessing shader"};
 cvar_t r_glsl_postprocess_uservec1 = {CVAR_SAVE, "r_glsl_postprocess_uservec1", "0 0 0 0", "a 4-component vector to pass as uservec1 to the postprocessing shader (only useful if default.glsl has been customized)"};
@@ -795,7 +797,7 @@ typedef struct r_glsl_permutation_s
        int loc_LightColor;
        int loc_LightDir;
        int loc_LightPosition;
-       int loc_OffsetMapping_Scale;
+       int loc_OffsetMapping_ScaleSteps;
        int loc_PixelSize;
        int loc_ReflectColor;
        int loc_ReflectFactor;
@@ -1105,7 +1107,7 @@ static void R_GLSL_CompilePermutation(r_glsl_permutation_t *p, unsigned int mode
                p->loc_LightColor                 = qglGetUniformLocation(p->program, "LightColor");
                p->loc_LightDir                   = qglGetUniformLocation(p->program, "LightDir");
                p->loc_LightPosition              = qglGetUniformLocation(p->program, "LightPosition");
-               p->loc_OffsetMapping_Scale        = qglGetUniformLocation(p->program, "OffsetMapping_Scale");
+               p->loc_OffsetMapping_ScaleSteps   = qglGetUniformLocation(p->program, "OffsetMapping_ScaleSteps");
                p->loc_PixelSize                  = qglGetUniformLocation(p->program, "PixelSize");
                p->loc_ReflectColor               = qglGetUniformLocation(p->program, "ReflectColor");
                p->loc_ReflectFactor              = qglGetUniformLocation(p->program, "ReflectFactor");
@@ -1322,7 +1324,7 @@ typedef enum D3DPSREGISTER_e
        D3DPSREGISTER_LightColor = 21,
        D3DPSREGISTER_LightDir = 22, // unused
        D3DPSREGISTER_LightPosition = 23,
-       D3DPSREGISTER_OffsetMapping_Scale = 24,
+       D3DPSREGISTER_OffsetMapping_ScaleSteps = 24,
        D3DPSREGISTER_PixelSize = 25,
        D3DPSREGISTER_ReflectColor = 26,
        D3DPSREGISTER_ReflectFactor = 27,
@@ -2496,7 +2498,7 @@ void R_SetupShader_Surface(const vec3_t lightcolorbase, qboolean modellighting,
                hlslPSSetParameter1f(D3DPSREGISTER_FogPlaneViewDist, rsurface.fogplaneviewdist);
                hlslPSSetParameter1f(D3DPSREGISTER_FogRangeRecip, rsurface.fograngerecip);
                hlslPSSetParameter1f(D3DPSREGISTER_FogHeightFade, rsurface.fogheightfade);
-               hlslPSSetParameter1f(D3DPSREGISTER_OffsetMapping_Scale, r_glsl_offsetmapping_scale.value);
+               hlslPSSetParameter3f(D3DPSREGISTER_OffsetMapping_ScaleSteps, r_glsl_offsetmapping_scale.value, max(1, (permutation & SHADERPERMUTATION_OFFSETMAPPING_RELIEFMAPPING) ? r_glsl_offsetmapping_reliefmapping_steps.integer : r_glsl_offsetmapping_steps.integer), 1.0 / max(1, (permutation & SHADERPERMUTATION_OFFSETMAPPING_RELIEFMAPPING) ? r_glsl_offsetmapping_reliefmapping_steps.integer : r_glsl_offsetmapping_steps.integer));
                hlslPSSetParameter2f(D3DPSREGISTER_ScreenToDepth, r_refdef.view.viewport.screentodepth[0], r_refdef.view.viewport.screentodepth[1]);
                hlslPSSetParameter2f(D3DPSREGISTER_PixelToScreenTexCoord, 1.0f/vid.width, 1.0/vid.height);
 
@@ -2651,7 +2653,7 @@ void R_SetupShader_Surface(const vec3_t lightcolorbase, qboolean modellighting,
                if (r_glsl_permutation->loc_FogPlaneViewDist >= 0) qglUniform1f(r_glsl_permutation->loc_FogPlaneViewDist, rsurface.fogplaneviewdist);
                if (r_glsl_permutation->loc_FogRangeRecip >= 0) qglUniform1f(r_glsl_permutation->loc_FogRangeRecip, rsurface.fograngerecip);
                if (r_glsl_permutation->loc_FogHeightFade >= 0) qglUniform1f(r_glsl_permutation->loc_FogHeightFade, rsurface.fogheightfade);
-               if (r_glsl_permutation->loc_OffsetMapping_Scale >= 0) qglUniform1f(r_glsl_permutation->loc_OffsetMapping_Scale, r_glsl_offsetmapping_scale.value*rsurface.texture->offsetscale);
+               if (r_glsl_permutation->loc_OffsetMapping_ScaleSteps >= 0) qglUniform3f(r_glsl_permutation->loc_OffsetMapping_ScaleSteps, r_glsl_offsetmapping_scale.value*rsurface.texture->offsetscale, max(1, (permutation & SHADERPERMUTATION_OFFSETMAPPING_RELIEFMAPPING) ? r_glsl_offsetmapping_reliefmapping_steps.integer : r_glsl_offsetmapping_steps.integer), 1.0 / max(1, (permutation & SHADERPERMUTATION_OFFSETMAPPING_RELIEFMAPPING) ? r_glsl_offsetmapping_reliefmapping_steps.integer : r_glsl_offsetmapping_steps.integer));
                if (r_glsl_permutation->loc_ScreenToDepth >= 0) qglUniform2f(r_glsl_permutation->loc_ScreenToDepth, r_refdef.view.viewport.screentodepth[0], r_refdef.view.viewport.screentodepth[1]);
                if (r_glsl_permutation->loc_PixelToScreenTexCoord >= 0) qglUniform2f(r_glsl_permutation->loc_PixelToScreenTexCoord, 1.0f/vid.width, 1.0f/vid.height);
                if (r_glsl_permutation->loc_BounceGridMatrix >= 0) {Matrix4x4_Concat(&tempmatrix, &r_shadow_bouncegridmatrix, &rsurface.matrix);Matrix4x4_ToArrayFloatGL(&tempmatrix, m16f);qglUniformMatrix4fv(r_glsl_permutation->loc_BounceGridMatrix, 1, false, m16f);}
@@ -2790,7 +2792,7 @@ void R_SetupShader_Surface(const vec3_t lightcolorbase, qboolean modellighting,
                DPSOFTRAST_Uniform1f(DPSOFTRAST_UNIFORM_FogPlaneViewDist, rsurface.fogplaneviewdist);
                DPSOFTRAST_Uniform1f(DPSOFTRAST_UNIFORM_FogRangeRecip, rsurface.fograngerecip);
                DPSOFTRAST_Uniform1f(DPSOFTRAST_UNIFORM_FogHeightFade, rsurface.fogheightfade);
-               DPSOFTRAST_Uniform1f(DPSOFTRAST_UNIFORM_OffsetMapping_Scale, r_glsl_offsetmapping_scale.value*rsurface.texture->offsetscale);
+               DPSOFTRAST_Uniform3f(DPSOFTRAST_UNIFORM_OffsetMapping_ScaleSteps, r_glsl_offsetmapping_scale.value*rsurface.texture->offsetscale, max(1, (permutation & SHADERPERMUTATION_OFFSETMAPPING_RELIEFMAPPING) ? r_glsl_offsetmapping_reliefmapping_steps.integer : r_glsl_offsetmapping_steps.integer), 1.0 / max(1, (permutation & SHADERPERMUTATION_OFFSETMAPPING_RELIEFMAPPING) ? r_glsl_offsetmapping_reliefmapping_steps.integer : r_glsl_offsetmapping_steps.integer));
                DPSOFTRAST_Uniform2f(DPSOFTRAST_UNIFORM_ScreenToDepth, r_refdef.view.viewport.screentodepth[0], r_refdef.view.viewport.screentodepth[1]);
                DPSOFTRAST_Uniform2f(DPSOFTRAST_UNIFORM_PixelToScreenTexCoord, 1.0f/vid.width, 1.0f/vid.height);
 
@@ -4065,7 +4067,9 @@ void GL_Main_Init(void)
        Cvar_RegisterVariable(&r_glsl);
        Cvar_RegisterVariable(&r_glsl_deluxemapping);
        Cvar_RegisterVariable(&r_glsl_offsetmapping);
+       Cvar_RegisterVariable(&r_glsl_offsetmapping_steps);
        Cvar_RegisterVariable(&r_glsl_offsetmapping_reliefmapping);
+       Cvar_RegisterVariable(&r_glsl_offsetmapping_reliefmapping_steps);
        Cvar_RegisterVariable(&r_glsl_offsetmapping_scale);
        Cvar_RegisterVariable(&r_glsl_postprocess);
        Cvar_RegisterVariable(&r_glsl_postprocess_uservec1);

diff --git a/shader_glsl.h b/shader_glsl.h
index d6734e0a88ff259a34c44001843da2091b81f2f6..f5c440214a1c30c14ff89b0fbc232f3c5949238b 100644 (file)
--- a/shader_glsl.h
+++ b/shader_glsl.h
@@ -597,28 +597,22 @@
 "#endif\n"
 "\n"
 "#ifdef USEOFFSETMAPPING\n"
-"uniform mediump float OffsetMapping_Scale;\n"
+"uniform mediump vec3 OffsetMapping_ScaleSteps;\n"
 "vec2 OffsetMapping(vec2 TexCoord, vec2 dPdx, vec2 dPdy)\n"
 "{\n"
+"      float i;\n"
 "#ifdef USEOFFSETMAPPING_RELIEFMAPPING\n"
 "      // 14 sample relief mapping: linear search and then binary search\n"
 "      // this basically steps forward a small amount repeatedly until it finds\n"
 "      // itself inside solid, then jitters forward and back using decreasing\n"
 "      // amounts to find the impact\n"
-"      //vec3 OffsetVector = vec3(EyeVectorFogDepth.xy * ((1.0 / EyeVectorFogDepth.z) * OffsetMapping_Scale) * vec2(-1, 1), -1);\n"
-"      //vec3 OffsetVector = vec3(normalize(EyeVectorFogDepth.xy) * OffsetMapping_Scale * vec2(-1, 1), -1);\n"
-"      vec3 OffsetVector = vec3(normalize(EyeVectorFogDepth.xyz).xy * OffsetMapping_Scale * vec2(-1, 1), -1);\n"
+"      //vec3 OffsetVector = vec3(EyeVectorFogDepth.xy * ((1.0 / EyeVectorFogDepth.z) * OffsetMapping_ScaleSteps.x) * vec2(-1, 1), -1);\n"
+"      //vec3 OffsetVector = vec3(normalize(EyeVectorFogDepth.xy) * OffsetMapping_ScaleSteps.x * vec2(-1, 1), -1);\n"
+"      vec3 OffsetVector = vec3(normalize(EyeVectorFogDepth.xyz).xy * OffsetMapping_ScaleSteps.x * vec2(-1, 1), -1);\n"
 "      vec3 RT = vec3(TexCoord, 1);\n"
-"      OffsetVector *= 0.1;\n"
-"      RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
+"      OffsetVector *= OffsetMapping_ScaleSteps.z;\n"
+"      for(i = 1.0; i < OffsetMapping_ScaleSteps.y; ++i)\n"
+"              RT += OffsetVector *  step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
 "      RT += OffsetVector * (step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z)          - 0.5);\n"
 "      RT += OffsetVector * (step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z) * 0.5    - 0.25);\n"
 "      RT += OffsetVector * (step(dp_textureGrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z) * 0.25   - 0.125);\n"
@@ -627,12 +621,12 @@
 "      return RT.xy;\n"
 "#else\n"
 "      // 2 sample offset mapping (only 2 samples because of ATI Radeon 9500-9800/X300 limits)\n"
-"      //vec2 OffsetVector = vec2(EyeVectorFogDepth.xy * ((1.0 / EyeVectorFogDepth.z) * OffsetMapping_Scale) * vec2(-1, 1));\n"
-"      //vec2 OffsetVector = vec2(normalize(EyeVectorFogDepth.xy) * OffsetMapping_Scale * vec2(-1, 1));\n"
-"      vec2 OffsetVector = vec2(normalize(EyeVectorFogDepth.xyz).xy * OffsetMapping_Scale * vec2(-1, 1));\n"
-"      OffsetVector *= 0.5;\n"
-"      TexCoord += OffsetVector * (1.0 - dp_textureGrad(Texture_Normal, TexCoord, dPdx, dPdy).a);\n"
-"      TexCoord += OffsetVector * (1.0 - dp_textureGrad(Texture_Normal, TexCoord, dPdx, dPdy).a);\n"
+"      //vec2 OffsetVector = vec2(EyeVectorFogDepth.xy * ((1.0 / EyeVectorFogDepth.z) * OffsetMapping_ScaleSteps.x) * vec2(-1, 1));\n"
+"      //vec2 OffsetVector = vec2(normalize(EyeVectorFogDepth.xy) * OffsetMapping_ScaleSteps.x * vec2(-1, 1));\n"
+"      vec2 OffsetVector = vec2(normalize(EyeVectorFogDepth.xyz).xy * OffsetMapping_ScaleSteps.x * vec2(-1, 1));\n"
+"      OffsetVector *= OffsetMapping_ScaleSteps.z;\n"
+"      for(i = 0.0; i < OffsetMapping_ScaleSteps.y; ++i)\n"
+"              TexCoord += OffsetVector * (1.0 - dp_textureGrad(Texture_Normal, TexCoord, dPdx, dPdy).a);\n"
 "      return TexCoord;\n"
 "#endif\n"
 "}\n"

diff --git a/shader_hlsl.h b/shader_hlsl.h
index 2125d0b61553c30b56363b08925bde7099216548..f5d1dd8a9e915815dbfba4627613ab966877df53 100644 (file)
--- a/shader_hlsl.h
+++ b/shader_hlsl.h
@@ -495,27 +495,21 @@
 "#endif\n"
 "\n"
 "#ifdef USEOFFSETMAPPING\n"
-"float2 OffsetMapping(float2 TexCoord, float OffsetMapping_Scale, float3 EyeVector, sampler Texture_Normal, float2 dPdx, float2 dPdy)\n"
+"float2 OffsetMapping(float2 TexCoord, float3 OffsetMapping_ScaleSteps, float3 EyeVector, sampler Texture_Normal, float2 dPdx, float2 dPdy)\n"
 "{\n"
+"      float i;\n"
 "#ifdef USEOFFSETMAPPING_RELIEFMAPPING\n"
 "      // 14 sample relief mapping: linear search and then binary search\n"
 "      // this basically steps forward a small amount repeatedly until it finds\n"
 "      // itself inside solid, then jitters forward and back using decreasing\n"
 "      // amounts to find the impact\n"
-"      //float3 OffsetVector = float3(EyeVector.xy * ((1.0 / EyeVector.z) * OffsetMapping_Scale) * float2(-1, 1), -1);\n"
-"      //float3 OffsetVector = float3(normalize(EyeVector.xy) * OffsetMapping_Scale * float2(-1, 1), -1);\n"
-"      float3 OffsetVector = float3(normalize(EyeVector).xy * OffsetMapping_Scale * float2(-1, 1), -1);\n"
+"      //float3 OffsetVector = float3(EyeVector.xy * ((1.0 / EyeVector.z) * OffsetMapping_ScaleSteps.x) * float2(-1, 1), -1);\n"
+"      //float3 OffsetVector = float3(normalize(EyeVector.xy) * OffsetMapping_ScaleSteps.x * float2(-1, 1), -1);\n"
+"      float3 OffsetVector = float3(normalize(EyeVector).xy * OffsetMapping_ScaleSteps.x * float2(-1, 1), -1);\n"
 "      float3 RT = float3(TexCoord, 1);\n"
-"      OffsetVector *= 0.1;\n"
-"      RT += OffsetVector *  step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
-"      RT += OffsetVector *  step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
+"      OffsetVector *= OffsetMapping_ScaleSteps.z;\n"
+"      for(i = 1.0; i < OffsetMapping_ScaleSteps.y; ++i)\n"
+"              RT += OffsetVector *  step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z);\n"
 "      RT += OffsetVector * (step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z)          - 0.5);\n"
 "      RT += OffsetVector * (step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z) * 0.5    - 0.25);\n"
 "      RT += OffsetVector * (step(tex2Dgrad(Texture_Normal, RT.xy, dPdx, dPdy).a, RT.z) * 0.25   - 0.125);\n"
@@ -524,12 +518,12 @@
 "      return RT.xy;\n"
 "#else\n"
 "      // 2 sample offset mapping (only 2 samples because of ATI Radeon 9500-9800/X300 limits)\n"
-"      //float2 OffsetVector = float2(EyeVector.xy * ((1.0 / EyeVector.z) * OffsetMapping_Scale) * float2(-1, 1));\n"
-"      //float2 OffsetVector = float2(normalize(EyeVector.xy) * OffsetMapping_Scale * float2(-1, 1));\n"
-"      float2 OffsetVector = float2(normalize(EyeVector).xy * OffsetMapping_Scale * float2(-1, 1));\n"
-"      OffsetVector *= 0.5;\n"
-"      TexCoord += OffsetVector * (1.0 - tex2Dgrad(Texture_Normal, TexCoord, dPdx, dPdy).a);\n"
-"      TexCoord += OffsetVector * (1.0 - tex2Dgrad(Texture_Normal, TexCoord, dPdx, dPdy).a);\n"
+"      //float2 OffsetVector = float2(EyeVector.xy * ((1.0 / EyeVector.z) * OffsetMapping_ScaleSteps.x) * float2(-1, 1));\n"
+"      //float2 OffsetVector = float2(normalize(EyeVector.xy) * OffsetMapping_ScaleSteps.x * float2(-1, 1));\n"
+"      float2 OffsetVector = float2(normalize(EyeVector).xy * OffsetMapping_ScaleSteps.x * float2(-1, 1));\n"
+"      OffsetVector *= OffsetMapping_ScaleSteps.z;\n"
+"      for(i = 0.0; i < OffsetMapping_ScaleSteps.y; ++i)\n"
+"              TexCoord += OffsetVector * (1.0 - tex2Dgrad(Texture_Normal, TexCoord, dPdx, dPdy).a);\n"
 "      return TexCoord;\n"
 "#endif\n"
 "}\n"
@@ -742,7 +736,7 @@
 "uniform sampler Texture_SecondaryGloss : register(s6),\n"
 "#endif\n"
 "#ifdef USEOFFSETMAPPING\n"
-"uniform float OffsetMapping_Scale : register(c24),\n"
+"uniform float3 OffsetMapping_ScaleSteps : register(c24),\n"
 "#endif\n"
 "uniform half SpecularPower : register(c36),\n"
 "#ifdef HLSL\n"
@@ -758,7 +752,7 @@
 "      // apply offsetmapping\n"
 "      float2 dPdx = ddx(TexCoord);\n"
 "      float2 dPdy = ddy(TexCoord);\n"
-"      float2 TexCoordOffset = OffsetMapping(TexCoord, OffsetMapping_Scale, EyeVector, Texture_Normal, dPdx, dPdy);\n"
+"      float2 TexCoordOffset = OffsetMapping(TexCoord, OffsetMapping_ScaleSteps, EyeVector, Texture_Normal, dPdx, dPdy);\n"
 "# define offsetMappedTexture2D(t) tex2Dgrad(t, TexCoordOffset, dPdx, dPdy)\n"
 "#else\n"
 "# define offsetMappedTexture2D(t) tex2D(t, TexCoord)\n"
@@ -1169,7 +1163,7 @@
 "#endif\n"
 "\n"
 "#ifdef USEOFFSETMAPPING\n"
-"uniform float OffsetMapping_Scale : register(c24),\n"
+"uniform float3 OffsetMapping_ScaleSteps : register(c24),\n"
 "#endif\n"
 "\n"
 "#ifdef USEDEFERREDLIGHTMAP\n"
@@ -1239,7 +1233,7 @@
 "      // apply offsetmapping\n"
 "      float2 dPdx = ddx(TexCoord);\n"
 "      float2 dPdy = ddy(TexCoord);\n"
-"      float2 TexCoordOffset = OffsetMapping(TexCoord, OffsetMapping_Scale, EyeVector, Texture_Normal, dPdx, dPdy);\n"
+"      float2 TexCoordOffset = OffsetMapping(TexCoord, OffsetMapping_ScaleSteps, EyeVector, Texture_Normal, dPdx, dPdy);\n"
 "# define offsetMappedTexture2D(t) tex2Dgrad(t, TexCoordOffset, dPdx, dPdy)\n"
 "#else\n"
 "# define offsetMappedTexture2D(t) tex2D(t, TexCoord)\n"