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  1. /*
  2.  * Mesa 3-D graphics library
  3.  *
  4.  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the "Software"),
  8.  * to deal in the Software without restriction, including without limitation
  9.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10.  * and/or sell copies of the Software, and to permit persons to whom the
  11.  * Software is furnished to do so, subject to the following conditions:
  12.  *
  13.  * The above copyright notice and this permission notice shall be included
  14.  * in all copies or substantial portions of the Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22.  * OTHER DEALINGS IN THE SOFTWARE.
  23.  *
  24.  * Authors:
  25.  *    Keith Whitwell <keith@tungstengraphics.com>
  26.  */
  27.  
  28.  
  29. #include "main/glheader.h"
  30. #include "main/colormac.h"
  31. #include "main/macros.h"
  32. #include "main/imports.h"
  33. #include "main/mtypes.h"
  34.  
  35. #include "math/m_xform.h"
  36.  
  37. #include "t_context.h"
  38. #include "t_pipeline.h"
  39.  
  40.  
  41. struct normal_stage_data {
  42.    normal_func NormalTransform;
  43.    GLvector4f normal;
  44. };
  45.  
  46. #define NORMAL_STAGE_DATA(stage) ((struct normal_stage_data *)stage->privatePtr)
  47.  
  48.  
  49. static GLboolean
  50. run_normal_stage(struct gl_context *ctx, struct tnl_pipeline_stage *stage)
  51. {
  52.    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
  53.    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  54.    const GLfloat *lengths;
  55.  
  56.    if (!store->NormalTransform)
  57.       return GL_TRUE;
  58.  
  59.    /* We can only use the display list's saved normal lengths if we've
  60.     * got a transformation matrix with uniform scaling.
  61.     */
  62.    if (_math_matrix_is_general_scale(ctx->ModelviewMatrixStack.Top))
  63.       lengths = NULL;
  64.    else
  65.       lengths = VB->NormalLengthPtr;
  66.  
  67.    store->NormalTransform( ctx->ModelviewMatrixStack.Top,
  68.                            ctx->_ModelViewInvScale,
  69.                            VB->AttribPtr[_TNL_ATTRIB_NORMAL],  /* input normals */
  70.                            lengths,
  71.                            &store->normal ); /* resulting normals */
  72.  
  73.    if (VB->AttribPtr[_TNL_ATTRIB_NORMAL]->count > 1) {
  74.       store->normal.stride = 4 * sizeof(GLfloat);
  75.    }
  76.    else {
  77.       store->normal.stride = 0;
  78.    }
  79.  
  80.    VB->AttribPtr[_TNL_ATTRIB_NORMAL] = &store->normal;
  81.  
  82.    VB->NormalLengthPtr = NULL;  /* no longer valid */
  83.    return GL_TRUE;
  84. }
  85.  
  86.  
  87. /**
  88.  * Examine current GL state and set the store->NormalTransform pointer
  89.  * to point to the appropriate normal transformation routine.
  90.  */
  91. static void
  92. validate_normal_stage(struct gl_context *ctx, struct tnl_pipeline_stage *stage)
  93. {
  94.    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
  95.  
  96.    if (ctx->VertexProgram._Current ||
  97.        (!ctx->Light.Enabled &&
  98.         !(ctx->Texture._GenFlags & TEXGEN_NEED_NORMALS))) {
  99.       store->NormalTransform = NULL;
  100.       return;
  101.    }
  102.  
  103.    if (ctx->_NeedEyeCoords) {
  104.       /* Eye coordinates are needed, for whatever reasons.
  105.        * Do lighting in eye coordinates, as the GL spec says.
  106.        */
  107.       GLuint transform = NORM_TRANSFORM_NO_ROT;
  108.  
  109.       if (_math_matrix_has_rotation(ctx->ModelviewMatrixStack.Top)) {
  110.          /* need to do full (3x3) matrix transform */
  111.          transform = NORM_TRANSFORM;
  112.       }
  113.  
  114.       if (ctx->Transform.Normalize) {
  115.          store->NormalTransform = _mesa_normal_tab[transform | NORM_NORMALIZE];
  116.       }
  117.       else if (ctx->Transform.RescaleNormals &&
  118.                ctx->_ModelViewInvScale != 1.0) {
  119.          store->NormalTransform = _mesa_normal_tab[transform | NORM_RESCALE];
  120.       }
  121.       else {
  122.          store->NormalTransform = _mesa_normal_tab[transform];
  123.       }
  124.    }
  125.    else {
  126.       /* We don't need eye coordinates.
  127.        * Do lighting in object coordinates.  Thus, we don't need to fully
  128.        * transform normal vectors (just leave them in object coordinates)
  129.        * but we still need to do normalization/rescaling if enabled.
  130.        */
  131.       if (ctx->Transform.Normalize) {
  132.          store->NormalTransform = _mesa_normal_tab[NORM_NORMALIZE];
  133.       }
  134.       else if (!ctx->Transform.RescaleNormals &&
  135.                ctx->_ModelViewInvScale != 1.0) {
  136.          store->NormalTransform = _mesa_normal_tab[NORM_RESCALE];
  137.       }
  138.       else {
  139.          store->NormalTransform = NULL;
  140.       }
  141.    }
  142. }
  143.  
  144.  
  145. /**
  146.  * Allocate stage's private data (storage for transformed normals).
  147.  */
  148. static GLboolean
  149. alloc_normal_data(struct gl_context *ctx, struct tnl_pipeline_stage *stage)
  150. {
  151.    TNLcontext *tnl = TNL_CONTEXT(ctx);
  152.    struct normal_stage_data *store;
  153.  
  154.    stage->privatePtr = malloc(sizeof(*store));
  155.    store = NORMAL_STAGE_DATA(stage);
  156.    if (!store)
  157.       return GL_FALSE;
  158.  
  159.    _mesa_vector4f_alloc( &store->normal, 0, tnl->vb.Size, 32 );
  160.    return GL_TRUE;
  161. }
  162.  
  163.  
  164. /**
  165.  * Free stage's private data.
  166.  */
  167. static void
  168. free_normal_data(struct tnl_pipeline_stage *stage)
  169. {
  170.    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
  171.    if (store) {
  172.       _mesa_vector4f_free( &store->normal );
  173.       free( store );
  174.       stage->privatePtr = NULL;
  175.    }
  176. }
  177.  
  178.  
  179. const struct tnl_pipeline_stage _tnl_normal_transform_stage =
  180. {
  181.    "normal transform",          /* name */
  182.    NULL,                        /* privatePtr */
  183.    alloc_normal_data,           /* create */
  184.    free_normal_data,            /* destroy */
  185.    validate_normal_stage,       /* validate */
  186.    run_normal_stage             /* run */
  187. };
  188.