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