/* * Mesa 3-D graphics library * * 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 * THE AUTHORS OR COPYRIGHT HOLDERS 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 <keithw@vmware.com> */ #include "main/glheader.h" #include "main/macros.h" #include "main/imports.h" #include "main/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(struct gl_context *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->NormalLengthPtr = NULL; /* no longer valid */ return GL_TRUE; } /** * Examine current GL state and set the store-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(struct gl_context *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 != 1.0F) { 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 != 1.0F) { 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(struct gl_context *ctx, struct tnl_pipeline_stage *stage) { TNLcontext *tnl = TNL_CONTEXT(ctx); struct normal_stage_data *store; stage->privatePtr = 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 ); 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 */ };