binaries/data/mods/mod/shaders/arb/terrain_common.vp

   1 !!ARBvp1.0
   2 PARAM sunColor = program.local[0];
   3 PARAM textureTransform = program.local[1];
   4 PARAM losTransform = program.local[2];
   5 PARAM shadowTransform[4] = { program.local[3..6] };
   6 PARAM sunDir = program.local[8];
   7 PARAM transform[4] = { program.local[9..12] };
   8
   9 #if USE_FP_SHADOW && USE_SHADOW_PCF
  10   PARAM shadowScale = program.local[7];
  11 #endif
  12
  13 TEMP lighting;
  14
  15 TEMP terrainTextureTransform;
  16 MOV terrainTextureTransform, textureTransform;
  17 MOV terrainTextureTransform.z, -textureTransform.y;
  18 MOV terrainTextureTransform.w, 0;
  19
  20 //// Compute position and normal:
  21
  22 ATTRIB position = vertex.position;
  23
  24 DP4 result.position.x, transform[0], position;
  25 DP4 result.position.y, transform[1], position;
  26 DP4 result.position.z, transform[2], position;
  27 DP4 result.position.w, transform[3], position;
  28
  29 //// Compute lighting:
  30
  31 // Diffuse factor is precomputed in vertex attribute
  32 // Scale diffuse to allow overbrightness (since result.color will be clamped to [0, 1])
  33 //
  34 DP3 lighting, -sunDir, vertex.normal;
  35 MAX lighting, 0.0, lighting; // DP3_SAT isn't available here.
  36 MUL lighting, lighting, 0.5;
  37 // Apply light color
  38 MUL result.color, lighting, sunColor;
  39
  40 //// Texture coordinates:
  41
  42 #if DECAL
  43   MOV result.texcoord[0], vertex.texcoord[0];
  44 #else
  45   // Compute texcoords from position and terrain-texture-dependent transform.
  46   // textureTransform is stored as [c, -s, s, 0],
  47   // and we want texcoord = (x*c + z*-s, x*-s + z*-c, 0, 1)
  48   DP3 result.texcoord[0].x, terrainTextureTransform.xyww, position.xzww;
  49   DP3 result.texcoord[0].y, -terrainTextureTransform.zxww, position.xzww;
  50   MOV result.texcoord[0].z, 0;
  51   MOV result.texcoord[0].w, 1;
  52 #endif
  53
  54 #if BLEND
  55   MOV result.texcoord[1], vertex.texcoord[1];
  56 #endif
  57
  58 #if USE_SHADOW
  59   #if USE_FP_SHADOW && USE_SHADOW_PCF
  60     TEMP shadowtc;
  61     DP4 shadowtc.x, shadowTransform[0], position;
  62     DP4 shadowtc.y, shadowTransform[1], position;
  63     MUL result.texcoord[2].xy, shadowtc, shadowScale;
  64   #else
  65     DP4 result.texcoord[2].x, shadowTransform[0], position;
  66     DP4 result.texcoord[2].y, shadowTransform[1], position;
  67   #endif
  68   DP4 result.texcoord[2].z, shadowTransform[2], position;
  69   DP4 result.texcoord[2].w, shadowTransform[3], position;
  70 #endif
  71
  72 MAD result.texcoord[3], position.xzzz, losTransform.x, losTransform.y;
  73
  74 END