0,0 → 1,187 |
/* |
* 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 <keith@tungstengraphics.com> |
*/ |
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#include "main/glheader.h" |
#include "main/colormac.h" |
#include "main/macros.h" |
#include "main/imports.h" |
#include "main/mtypes.h" |
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#include "math/m_xform.h" |
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#include "t_context.h" |
#include "t_pipeline.h" |
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struct normal_stage_data { |
normal_func NormalTransform; |
GLvector4f normal; |
}; |
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#define NORMAL_STAGE_DATA(stage) ((struct normal_stage_data *)stage->privatePtr) |
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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; |
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/* 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; |
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store->NormalTransform( ctx->ModelviewMatrixStack.Top, |
ctx->_ModelViewInvScale, |
VB->AttribPtr[_TNL_ATTRIB_NORMAL], /* input normals */ |
lengths, |
&store->normal ); /* resulting normals */ |
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if (VB->AttribPtr[_TNL_ATTRIB_NORMAL]->count > 1) { |
store->normal.stride = 4 * sizeof(GLfloat); |
} |
else { |
store->normal.stride = 0; |
} |
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VB->AttribPtr[_TNL_ATTRIB_NORMAL] = &store->normal; |
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VB->NormalLengthPtr = NULL; /* no longer valid */ |
return GL_TRUE; |
} |
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/** |
* 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); |
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if (ctx->VertexProgram._Current || |
(!ctx->Light.Enabled && |
!(ctx->Texture._GenFlags & TEXGEN_NEED_NORMALS))) { |
store->NormalTransform = NULL; |
return; |
} |
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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; |
} |
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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; |
} |
} |
} |
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/** |
* 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; |
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_mesa_vector4f_alloc( &store->normal, 0, tnl->vb.Size, 32 ); |
return GL_TRUE; |
} |
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/** |
* 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; |
} |
} |
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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 */ |
}; |