Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  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 <keithw@vmware.com>
  26.  */
  27.  
  28.  
  29. #include "main/glheader.h"
  30. #include "main/macros.h"
  31. #include "main/imports.h"
  32. #include "main/mtypes.h"
  33.  
  34. #include "math/m_xform.h"
  35.  
  36. #include "t_context.h"
  37. #include "t_pipeline.h"
  38.  
  39.  
  40. struct normal_stage_data {
  41.    normal_func NormalTransform;
  42.    GLvector4f normal;
  43. };
  44.  
  45. #define NORMAL_STAGE_DATA(stage) ((struct normal_stage_data *)stage->privatePtr)
  46.  
  47.  
  48. static GLboolean
  49. run_normal_stage(struct gl_context *ctx, struct tnl_pipeline_stage *stage)
  50. {
  51.    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
  52.    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  53.    const GLfloat *lengths;
  54.  
  55.    if (!store->NormalTransform)
  56.       return GL_TRUE;
  57.  
  58.    /* We can only use the display list's saved normal lengths if we've
  59.     * got a transformation matrix with uniform scaling.
  60.     */
  61.    if (_math_matrix_is_general_scale(ctx->ModelviewMatrixStack.Top))
  62.       lengths = NULL;
  63.    else
  64.       lengths = VB->NormalLengthPtr;
  65.  
  66.    store->NormalTransform( ctx->ModelviewMatrixStack.Top,
  67.                            ctx->_ModelViewInvScale,
  68.                            VB->AttribPtr[_TNL_ATTRIB_NORMAL],  /* input normals */
  69.                            lengths,
  70.                            &store->normal ); /* resulting normals */
  71.  
  72.    if (VB->AttribPtr[_TNL_ATTRIB_NORMAL]->count > 1) {
  73.       store->normal.stride = 4 * sizeof(GLfloat);
  74.    }
  75.    else {
  76.       store->normal.stride = 0;
  77.    }
  78.  
  79.    VB->AttribPtr[_TNL_ATTRIB_NORMAL] = &store->normal;
  80.  
  81.    VB->NormalLengthPtr = NULL;  /* no longer valid */
  82.    return GL_TRUE;
  83. }
  84.  
  85.  
  86. /**
  87.  * Examine current GL state and set the store->NormalTransform pointer
  88.  * to point to the appropriate normal transformation routine.
  89.  */
  90. static void
  91. validate_normal_stage(struct gl_context *ctx, struct tnl_pipeline_stage *stage)
  92. {
  93.    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
  94.  
  95.    if (ctx->VertexProgram._Current ||
  96.        (!ctx->Light.Enabled &&
  97.         !(ctx->Texture._GenFlags & TEXGEN_NEED_NORMALS))) {
  98.       store->NormalTransform = NULL;
  99.       return;
  100.    }
  101.  
  102.    if (ctx->_NeedEyeCoords) {
  103.       /* Eye coordinates are needed, for whatever reasons.
  104.        * Do lighting in eye coordinates, as the GL spec says.
  105.        */
  106.       GLuint transform = NORM_TRANSFORM_NO_ROT;
  107.  
  108.       if (_math_matrix_has_rotation(ctx->ModelviewMatrixStack.Top)) {
  109.          /* need to do full (3x3) matrix transform */
  110.          transform = NORM_TRANSFORM;
  111.       }
  112.  
  113.       if (ctx->Transform.Normalize) {
  114.          store->NormalTransform = _mesa_normal_tab[transform | NORM_NORMALIZE];
  115.       }
  116.       else if (ctx->Transform.RescaleNormals &&
  117.                ctx->_ModelViewInvScale != 1.0) {
  118.          store->NormalTransform = _mesa_normal_tab[transform | NORM_RESCALE];
  119.       }
  120.       else {
  121.          store->NormalTransform = _mesa_normal_tab[transform];
  122.       }
  123.    }
  124.    else {
  125.       /* We don't need eye coordinates.
  126.        * Do lighting in object coordinates.  Thus, we don't need to fully
  127.        * transform normal vectors (just leave them in object coordinates)
  128.        * but we still need to do normalization/rescaling if enabled.
  129.        */
  130.       if (ctx->Transform.Normalize) {
  131.          store->NormalTransform = _mesa_normal_tab[NORM_NORMALIZE];
  132.       }
  133.       else if (!ctx->Transform.RescaleNormals &&
  134.                ctx->_ModelViewInvScale != 1.0) {
  135.          store->NormalTransform = _mesa_normal_tab[NORM_RESCALE];
  136.       }
  137.       else {
  138.          store->NormalTransform = NULL;
  139.       }
  140.    }
  141. }
  142.  
  143.  
  144. /**
  145.  * Allocate stage's private data (storage for transformed normals).
  146.  */
  147. static GLboolean
  148. alloc_normal_data(struct gl_context *ctx, struct tnl_pipeline_stage *stage)
  149. {
  150.    TNLcontext *tnl = TNL_CONTEXT(ctx);
  151.    struct normal_stage_data *store;
  152.  
  153.    stage->privatePtr = malloc(sizeof(*store));
  154.    store = NORMAL_STAGE_DATA(stage);
  155.    if (!store)
  156.       return GL_FALSE;
  157.  
  158.    _mesa_vector4f_alloc( &store->normal, 0, tnl->vb.Size, 32 );
  159.    return GL_TRUE;
  160. }
  161.  
  162.  
  163. /**
  164.  * Free stage's private data.
  165.  */
  166. static void
  167. free_normal_data(struct tnl_pipeline_stage *stage)
  168. {
  169.    struct normal_stage_data *store = NORMAL_STAGE_DATA(stage);
  170.    if (store) {
  171.       _mesa_vector4f_free( &store->normal );
  172.       free( store );
  173.       stage->privatePtr = NULL;
  174.    }
  175. }
  176.  
  177.  
  178. const struct tnl_pipeline_stage _tnl_normal_transform_stage =
  179. {
  180.    "normal transform",          /* name */
  181.    NULL,                        /* privatePtr */
  182.    alloc_normal_data,           /* create */
  183.    free_normal_data,            /* destroy */
  184.    validate_normal_stage,       /* validate */
  185.    run_normal_stage             /* run */
  186. };
  187.