| /* |
| * Mesa 3-D graphics library |
| * Version: 6.5 |
| * |
| * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
| * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: |
| * Keith Whitwell <keith@tungstengraphics.com> |
| */ |
| |
| |
| #include "glheader.h" |
| #include "colormac.h" |
| #include "context.h" |
| #include "macros.h" |
| #include "imports.h" |
| #include "mtypes.h" |
| |
| #include "math/m_xform.h" |
| |
| #include "t_context.h" |
| #include "t_pipeline.h" |
| |
| |
| struct normal_stage_data { |
| normal_func NormalTransform; |
| GLvector4f normal; |
| }; |
| |
| #define NORMAL_STAGE_DATA(stage) ((struct normal_stage_data *)stage->privatePtr) |
| |
| |
| static GLboolean |
| run_normal_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage) |
| { |
| struct normal_stage_data *store = NORMAL_STAGE_DATA(stage); |
| struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; |
| const GLfloat *lengths; |
| |
| if (!store->NormalTransform) |
| return GL_TRUE; |
| |
| /* We can only use the display list's saved normal lengths if we've |
| * got a transformation matrix with uniform scaling. |
| */ |
| if (_math_matrix_is_general_scale(ctx->ModelviewMatrixStack.Top)) |
| lengths = NULL; |
| else |
| lengths = VB->NormalLengthPtr; |
| |
| store->NormalTransform( ctx->ModelviewMatrixStack.Top, |
| ctx->_ModelViewInvScale, |
| VB->AttribPtr[_TNL_ATTRIB_NORMAL], /* input normals */ |
| lengths, |
| &store->normal ); /* resulting normals */ |
| |
| if (VB->AttribPtr[_TNL_ATTRIB_NORMAL]->count > 1) { |
| store->normal.stride = 4 * sizeof(GLfloat); |
| } |
| else { |
| store->normal.stride = 0; |
| } |
| |
| VB->AttribPtr[_TNL_ATTRIB_NORMAL] = &store->normal; |
| VB->NormalPtr = &store->normal; |
| |
| VB->NormalLengthPtr = NULL; /* no longer valid */ |
| return GL_TRUE; |
| } |
| |
| |
| /** |
| * Examine current GL state and set the store->NormalTransform pointer |
| * to point to the appropriate normal transformation routine. |
| */ |
| static void |
| validate_normal_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage) |
| { |
| struct normal_stage_data *store = NORMAL_STAGE_DATA(stage); |
| |
| if (ctx->VertexProgram._Current || |
| (!ctx->Light.Enabled && |
| !(ctx->Texture._GenFlags & TEXGEN_NEED_NORMALS))) { |
| store->NormalTransform = NULL; |
| return; |
| } |
| |
| if (ctx->_NeedEyeCoords) { |
| /* Eye coordinates are needed, for whatever reasons. |
| * Do lighting in eye coordinates, as the GL spec says. |
| */ |
| GLuint transform = NORM_TRANSFORM_NO_ROT; |
| |
| if (_math_matrix_has_rotation(ctx->ModelviewMatrixStack.Top)) { |
| /* need to do full (3x3) matrix transform */ |
| transform = NORM_TRANSFORM; |
| } |
| |
| if (ctx->Transform.Normalize) { |
| store->NormalTransform = _mesa_normal_tab[transform | NORM_NORMALIZE]; |
| } |
| else if (ctx->Transform.RescaleNormals && |
| ctx->_ModelViewInvScale != 1.0) { |
| store->NormalTransform = _mesa_normal_tab[transform | NORM_RESCALE]; |
| } |
| else { |
| store->NormalTransform = _mesa_normal_tab[transform]; |
| } |
| } |
| else { |
| /* We don't need eye coordinates. |
| * Do lighting in object coordinates. Thus, we don't need to fully |
| * transform normal vectors (just leave them in object coordinates) |
| * but we still need to do normalization/rescaling if enabled. |
| */ |
| if (ctx->Transform.Normalize) { |
| store->NormalTransform = _mesa_normal_tab[NORM_NORMALIZE]; |
| } |
| else if (!ctx->Transform.RescaleNormals && |
| ctx->_ModelViewInvScale != 1.0) { |
| store->NormalTransform = _mesa_normal_tab[NORM_RESCALE]; |
| } |
| else { |
| store->NormalTransform = NULL; |
| } |
| } |
| } |
| |
| |
| /** |
| * Allocate stage's private data (storage for transformed normals). |
| */ |
| static GLboolean |
| alloc_normal_data(GLcontext *ctx, struct tnl_pipeline_stage *stage) |
| { |
| TNLcontext *tnl = TNL_CONTEXT(ctx); |
| struct normal_stage_data *store; |
| |
| stage->privatePtr = _mesa_malloc(sizeof(*store)); |
| store = NORMAL_STAGE_DATA(stage); |
| if (!store) |
| return GL_FALSE; |
| |
| _mesa_vector4f_alloc( &store->normal, 0, tnl->vb.Size, 32 ); |
| return GL_TRUE; |
| } |
| |
| |
| /** |
| * Free stage's private data. |
| */ |
| static void |
| free_normal_data(struct tnl_pipeline_stage *stage) |
| { |
| struct normal_stage_data *store = NORMAL_STAGE_DATA(stage); |
| if (store) { |
| _mesa_vector4f_free( &store->normal ); |
| _mesa_free( store ); |
| stage->privatePtr = NULL; |
| } |
| } |
| |
| |
| const struct tnl_pipeline_stage _tnl_normal_transform_stage = |
| { |
| "normal transform", /* name */ |
| NULL, /* privatePtr */ |
| alloc_normal_data, /* create */ |
| free_normal_data, /* destroy */ |
| validate_normal_stage, /* validate */ |
| run_normal_stage /* run */ |
| }; |