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| 4358 | Serge | 1 | /* |
| 2 | * Mesa 3-D graphics library |
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| 3 | * |
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| 4 | * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the "Software"), |
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| 8 | * to deal in the Software without restriction, including without limitation |
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| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 11 | * Software is furnished to do so, subject to the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be included |
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| 14 | * in all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 17 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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| 20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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| 21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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| 22 | * OTHER DEALINGS IN THE SOFTWARE. |
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| 23 | * |
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| 24 | * Authors: |
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| 25 | * Keith Whitwell |
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| 26 | */ |
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| 27 | |||
| 28 | |||
| 29 | #include "main/glheader.h" |
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| 30 | #include "main/colormac.h" |
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| 31 | #include "main/macros.h" |
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| 32 | #include "main/imports.h" |
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| 33 | #include "main/mtypes.h" |
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| 34 | |||
| 35 | #include "math/m_xform.h" |
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| 36 | |||
| 37 | #include "t_context.h" |
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| 38 | #include "t_pipeline.h" |
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| 39 | |||
| 40 | |||
| 41 | struct normal_stage_data { |
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| 42 | normal_func NormalTransform; |
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| 43 | GLvector4f normal; |
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| 44 | }; |
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| 45 | |||
| 46 | #define NORMAL_STAGE_DATA(stage) ((struct normal_stage_data *)stage->privatePtr) |
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| 47 | |||
| 48 | |||
| 49 | static GLboolean |
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| 50 | run_normal_stage(struct gl_context *ctx, struct tnl_pipeline_stage *stage) |
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| 51 | { |
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| 52 | struct normal_stage_data *store = NORMAL_STAGE_DATA(stage); |
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| 53 | struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; |
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| 54 | const GLfloat *lengths; |
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| 55 | |||
| 56 | if (!store->NormalTransform) |
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| 57 | return GL_TRUE; |
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| 58 | |||
| 59 | /* We can only use the display list's saved normal lengths if we've |
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| 60 | * got a transformation matrix with uniform scaling. |
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| 61 | */ |
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| 62 | if (_math_matrix_is_general_scale(ctx->ModelviewMatrixStack.Top)) |
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| 63 | lengths = NULL; |
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| 64 | else |
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| 65 | lengths = VB->NormalLengthPtr; |
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| 66 | |||
| 67 | store->NormalTransform( ctx->ModelviewMatrixStack.Top, |
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| 68 | ctx->_ModelViewInvScale, |
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| 69 | VB->AttribPtr[_TNL_ATTRIB_NORMAL], /* input normals */ |
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| 70 | lengths, |
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| 71 | &store->normal ); /* resulting normals */ |
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| 72 | |||
| 73 | if (VB->AttribPtr[_TNL_ATTRIB_NORMAL]->count > 1) { |
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| 74 | store->normal.stride = 4 * sizeof(GLfloat); |
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| 75 | } |
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| 76 | else { |
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| 77 | store->normal.stride = 0; |
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| 78 | } |
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| 79 | |||
| 80 | VB->AttribPtr[_TNL_ATTRIB_NORMAL] = &store->normal; |
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| 81 | |||
| 82 | VB->NormalLengthPtr = NULL; /* no longer valid */ |
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| 83 | return GL_TRUE; |
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| 84 | } |
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| 85 | |||
| 86 | |||
| 87 | /** |
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| 88 | * Examine current GL state and set the store->NormalTransform pointer |
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| 89 | * to point to the appropriate normal transformation routine. |
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| 90 | */ |
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| 91 | static void |
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| 92 | validate_normal_stage(struct gl_context *ctx, struct tnl_pipeline_stage *stage) |
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| 93 | { |
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| 94 | struct normal_stage_data *store = NORMAL_STAGE_DATA(stage); |
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| 95 | |||
| 96 | if (ctx->VertexProgram._Current || |
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| 97 | (!ctx->Light.Enabled && |
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| 98 | !(ctx->Texture._GenFlags & TEXGEN_NEED_NORMALS))) { |
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| 99 | store->NormalTransform = NULL; |
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| 100 | return; |
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| 101 | } |
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| 102 | |||
| 103 | if (ctx->_NeedEyeCoords) { |
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| 104 | /* Eye coordinates are needed, for whatever reasons. |
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| 105 | * Do lighting in eye coordinates, as the GL spec says. |
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| 106 | */ |
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| 107 | GLuint transform = NORM_TRANSFORM_NO_ROT; |
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| 108 | |||
| 109 | if (_math_matrix_has_rotation(ctx->ModelviewMatrixStack.Top)) { |
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| 110 | /* need to do full (3x3) matrix transform */ |
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| 111 | transform = NORM_TRANSFORM; |
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| 112 | } |
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| 113 | |||
| 114 | if (ctx->Transform.Normalize) { |
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| 115 | store->NormalTransform = _mesa_normal_tab[transform | NORM_NORMALIZE]; |
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| 116 | } |
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| 117 | else if (ctx->Transform.RescaleNormals && |
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| 118 | ctx->_ModelViewInvScale != 1.0) { |
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| 119 | store->NormalTransform = _mesa_normal_tab[transform | NORM_RESCALE]; |
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| 120 | } |
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| 121 | else { |
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| 122 | store->NormalTransform = _mesa_normal_tab[transform]; |
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| 123 | } |
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| 124 | } |
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| 125 | else { |
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| 126 | /* We don't need eye coordinates. |
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| 127 | * Do lighting in object coordinates. Thus, we don't need to fully |
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| 128 | * transform normal vectors (just leave them in object coordinates) |
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| 129 | * but we still need to do normalization/rescaling if enabled. |
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| 130 | */ |
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| 131 | if (ctx->Transform.Normalize) { |
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| 132 | store->NormalTransform = _mesa_normal_tab[NORM_NORMALIZE]; |
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| 133 | } |
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| 134 | else if (!ctx->Transform.RescaleNormals && |
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| 135 | ctx->_ModelViewInvScale != 1.0) { |
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| 136 | store->NormalTransform = _mesa_normal_tab[NORM_RESCALE]; |
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| 137 | } |
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| 138 | else { |
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| 139 | store->NormalTransform = NULL; |
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| 140 | } |
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| 141 | } |
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| 142 | } |
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| 143 | |||
| 144 | |||
| 145 | /** |
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| 146 | * Allocate stage's private data (storage for transformed normals). |
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| 147 | */ |
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| 148 | static GLboolean |
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| 149 | alloc_normal_data(struct gl_context *ctx, struct tnl_pipeline_stage *stage) |
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| 150 | { |
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| 151 | TNLcontext *tnl = TNL_CONTEXT(ctx); |
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| 152 | struct normal_stage_data *store; |
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| 153 | |||
| 154 | stage->privatePtr = malloc(sizeof(*store)); |
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| 155 | store = NORMAL_STAGE_DATA(stage); |
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| 156 | if (!store) |
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| 157 | return GL_FALSE; |
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| 158 | |||
| 159 | _mesa_vector4f_alloc( &store->normal, 0, tnl->vb.Size, 32 ); |
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| 160 | return GL_TRUE; |
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| 161 | } |
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| 162 | |||
| 163 | |||
| 164 | /** |
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| 165 | * Free stage's private data. |
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| 166 | */ |
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| 167 | static void |
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| 168 | free_normal_data(struct tnl_pipeline_stage *stage) |
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| 169 | { |
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| 170 | struct normal_stage_data *store = NORMAL_STAGE_DATA(stage); |
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| 171 | if (store) { |
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| 172 | _mesa_vector4f_free( &store->normal ); |
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| 173 | free( store ); |
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| 174 | stage->privatePtr = NULL; |
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| 175 | } |
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| 176 | } |
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| 177 | |||
| 178 | |||
| 179 | const struct tnl_pipeline_stage _tnl_normal_transform_stage = |
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| 180 | { |
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| 181 | "normal transform", /* name */ |
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| 182 | NULL, /* privatePtr */ |
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| 183 | alloc_normal_data, /* create */ |
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| 184 | free_normal_data, /* destroy */ |
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| 185 | validate_normal_stage, /* validate */ |
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| 186 | run_normal_stage /* run */ |
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| 187 | }; |