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- /* $Id: t_vb_texgen.c,v 1.15 2002/10/29 20:29:04 brianp Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 3.5
- *
- * Copyright (C) 1999-2001 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:
- * Brian Paul
- * Keith Whitwell <keith@tungstengraphics.com>
- */
-
-
- #include "glheader.h"
- #include "colormac.h"
- #include "context.h"
- #include "macros.h"
- #include "mmath.h"
- #include "imports.h"
- #include "mtypes.h"
-
- #include "math/m_xform.h"
-
- #include "t_context.h"
- #include "t_pipeline.h"
-
-
- /***********************************************************************
- * Automatic texture coordinate generation (texgen) code.
- */
-
-
- struct texgen_stage_data;
-
- typedef void (*texgen_func)( GLcontext *ctx,
- struct texgen_stage_data *store,
- GLuint unit);
-
-
- struct texgen_stage_data {
-
- /* Per-texunit derived state.
- */
- GLuint TexgenSize[MAX_TEXTURE_UNITS];
- GLuint TexgenHoles[MAX_TEXTURE_UNITS];
- texgen_func TexgenFunc[MAX_TEXTURE_UNITS];
-
- /* Temporary values used in texgen.
- */
- GLfloat (*tmp_f)[3];
- GLfloat *tmp_m;
-
- /* Buffered outputs of the stage.
- */
- GLvector4f texcoord[MAX_TEXTURE_UNITS];
- };
-
-
- #define TEXGEN_STAGE_DATA(stage) ((struct texgen_stage_data *)stage->privatePtr)
-
-
-
- static GLuint all_bits[5] = {
- 0,
- VEC_SIZE_1,
- VEC_SIZE_2,
- VEC_SIZE_3,
- VEC_SIZE_4,
- };
-
- #define VEC_SIZE_FLAGS (VEC_SIZE_1|VEC_SIZE_2|VEC_SIZE_3|VEC_SIZE_4)
-
- #define TEXGEN_NEED_M (TEXGEN_SPHERE_MAP)
- #define TEXGEN_NEED_F (TEXGEN_SPHERE_MAP | \
- TEXGEN_REFLECTION_MAP_NV)
-
-
-
- static void build_m3( GLfloat f[][3], GLfloat m[],
- const GLvector4f *normal,
- const GLvector4f *eye )
- {
- GLuint stride = eye->stride;
- GLfloat *coord = (GLfloat *)eye->start;
- GLuint count = eye->count;
- const GLfloat *norm = normal->start;
- GLuint i;
-
- for (i=0;i<count;i++,STRIDE_F(coord,stride),STRIDE_F(norm,normal->stride)) {
- GLfloat u[3], two_nu, fx, fy, fz;
- COPY_3V( u, coord );
- NORMALIZE_3FV( u );
- two_nu = 2.0F * DOT3(norm,u);
- fx = f[i][0] = u[0] - norm[0] * two_nu;
- fy = f[i][1] = u[1] - norm[1] * two_nu;
- fz = f[i][2] = u[2] - norm[2] * two_nu;
- m[i] = fx * fx + fy * fy + (fz + 1.0F) * (fz + 1.0F);
- if (m[i] != 0.0F) {
- m[i] = 0.5F / (GLfloat) GL_SQRT(m[i]);
- }
- }
- }
-
-
-
- static void build_m2( GLfloat f[][3], GLfloat m[],
- const GLvector4f *normal,
- const GLvector4f *eye )
- {
- GLuint stride = eye->stride;
- GLfloat *coord = eye->start;
- GLuint count = eye->count;
-
- GLfloat *norm = normal->start;
- GLuint i;
-
- for (i=0;i<count;i++,STRIDE_F(coord,stride),STRIDE_F(norm,normal->stride)) {
- GLfloat u[3], two_nu, fx, fy, fz;
- COPY_2V( u, coord );
- u[2] = 0;
- NORMALIZE_3FV( u );
- two_nu = 2.0F * DOT3(norm,u);
- fx = f[i][0] = u[0] - norm[0] * two_nu;
- fy = f[i][1] = u[1] - norm[1] * two_nu;
- fz = f[i][2] = u[2] - norm[2] * two_nu;
- m[i] = fx * fx + fy * fy + (fz + 1.0F) * (fz + 1.0F);
- if (m[i] != 0.0F) {
- m[i] = 0.5F / (GLfloat) GL_SQRT(m[i]);
- }
- }
- }
-
-
-
- typedef void (*build_m_func)( GLfloat f[][3],
- GLfloat m[],
- const GLvector4f *normal,
- const GLvector4f *eye );
-
-
- static build_m_func build_m_tab[5] = {
- 0,
- 0,
- build_m2,
- build_m3,
- build_m3
- };
-
-
- /* This is unusual in that we respect the stride of the output vector
- * (f). This allows us to pass in either a texcoord vector4f, or a
- * temporary vector3f.
- */
- static void build_f3( GLfloat *f,
- GLuint fstride,
- const GLvector4f *normal,
- const GLvector4f *eye )
- {
- GLuint stride = eye->stride;
- GLfloat *coord = eye->start;
- GLuint count = eye->count;
-
- GLfloat *norm = normal->start;
- GLuint i;
-
- for (i=0;i<count;i++) {
- GLfloat u[3], two_nu;
- COPY_3V( u, coord );
- NORMALIZE_3FV( u );
- two_nu = 2.0F * DOT3(norm,u);
- f[0] = u[0] - norm[0] * two_nu;
- f[1] = u[1] - norm[1] * two_nu;
- f[2] = u[2] - norm[2] * two_nu;
- STRIDE_F(coord,stride);
- STRIDE_F(f,fstride);
- STRIDE_F(norm, normal->stride);
- }
- }
-
-
- static void build_f2( GLfloat *f,
- GLuint fstride,
- const GLvector4f *normal,
- const GLvector4f *eye )
- {
- GLuint stride = eye->stride;
- GLfloat *coord = eye->start;
- GLuint count = eye->count;
- GLfloat *norm = normal->start;
- GLuint i;
-
- for (i=0;i<count;i++) {
-
- GLfloat u[3], two_nu;
- COPY_2V( u, coord );
- u[2] = 0;
- NORMALIZE_3FV( u );
- two_nu = 2.0F * DOT3(norm,u);
- f[0] = u[0] - norm[0] * two_nu;
- f[1] = u[1] - norm[1] * two_nu;
- f[2] = u[2] - norm[2] * two_nu;
-
- STRIDE_F(coord,stride);
- STRIDE_F(f,fstride);
- STRIDE_F(norm, normal->stride);
- }
- }
-
- typedef void (*build_f_func)( GLfloat *f,
- GLuint fstride,
- const GLvector4f *normal_vec,
- const GLvector4f *eye );
-
-
-
- /* Just treat 4-vectors as 3-vectors.
- */
- static build_f_func build_f_tab[5] = {
- 0,
- 0,
- build_f2,
- build_f3,
- build_f3
- };
-
-
- /* Special case texgen functions.
- */
- static void texgen_reflection_map_nv( GLcontext *ctx,
- struct texgen_stage_data *store,
- GLuint unit )
- {
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- GLvector4f *in = VB->TexCoordPtr[unit];
- GLvector4f *out = &store->texcoord[unit];
-
- build_f_tab[VB->EyePtr->size]( out->start,
- out->stride,
- VB->NormalPtr,
- VB->EyePtr );
-
- if (in) {
- out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_3;
- out->count = in->count;
- out->size = MAX2(in->size, 3);
- if (in->size == 4)
- _mesa_copy_tab[0x8]( out, in );
- }
- else {
- out->flags |= VEC_SIZE_3;
- out->size = 3;
- out->count = in->count;
- }
-
- }
-
-
-
- static void texgen_normal_map_nv( GLcontext *ctx,
- struct texgen_stage_data *store,
- GLuint unit )
- {
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- GLvector4f *in = VB->TexCoordPtr[unit];
- GLvector4f *out = &store->texcoord[unit];
- GLvector4f *normal = VB->NormalPtr;
- GLfloat (*texcoord)[4] = (GLfloat (*)[4])out->start;
- GLuint count = VB->Count;
- GLuint i;
- const GLfloat *norm = normal->start;
-
- for (i=0;i<count;i++, STRIDE_F(norm, normal->stride)) {
- texcoord[i][0] = norm[0];
- texcoord[i][1] = norm[1];
- texcoord[i][2] = norm[2];
- }
-
-
- if (in) {
- out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_3;
- out->count = in->count;
- out->size = MAX2(in->size, 3);
- if (in->size == 4)
- _mesa_copy_tab[0x8]( out, in );
- }
- else {
- out->flags |= VEC_SIZE_3;
- out->size = 3;
- out->count = in->count;
- }
- }
-
-
- static void texgen_sphere_map( GLcontext *ctx,
- struct texgen_stage_data *store,
- GLuint unit )
- {
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- GLvector4f *in = VB->TexCoordPtr[unit];
- GLvector4f *out = &store->texcoord[unit];
- GLfloat (*texcoord)[4] = (GLfloat (*)[4]) out->start;
- GLuint count = VB->Count;
- GLuint i;
- GLfloat (*f)[3] = store->tmp_f;
- GLfloat *m = store->tmp_m;
-
- /* _mesa_debug(NULL, "%s normstride %d eyestride %d\n", */
- /* __FUNCTION__, VB->NormalPtr->stride, */
- /* VB->EyePtr->stride); */
-
- (build_m_tab[VB->EyePtr->size])( store->tmp_f,
- store->tmp_m,
- VB->NormalPtr,
- VB->EyePtr );
-
- for (i=0;i<count;i++) {
- texcoord[i][0] = f[i][0] * m[i] + 0.5F;
- texcoord[i][1] = f[i][1] * m[i] + 0.5F;
- }
-
- if (in) {
- out->size = MAX2(in->size,2);
- out->count = in->count;
- out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_2;
- if (in->size > 2)
- _mesa_copy_tab[all_bits[in->size] & ~0x3]( out, in );
- } else {
- out->size = 2;
- out->flags |= VEC_SIZE_2;
- out->count = in->count;
- }
- }
-
-
-
- static void texgen( GLcontext *ctx,
- struct texgen_stage_data *store,
- GLuint unit )
- {
- TNLcontext *tnl = TNL_CONTEXT(ctx);
- struct vertex_buffer *VB = &tnl->vb;
- GLvector4f *in = VB->TexCoordPtr[unit];
- GLvector4f *out = &store->texcoord[unit];
- struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
- const GLvector4f *obj = VB->ObjPtr;
- const GLvector4f *eye = VB->EyePtr;
- const GLvector4f *normal = VB->NormalPtr;
- GLfloat (*texcoord)[4] = (GLfloat (*)[4])out->data;
- GLfloat *indata;
- GLuint count = VB->Count;
- GLfloat (*f)[3] = store->tmp_f;
- GLfloat *m = store->tmp_m;
- GLuint holes = 0;
-
-
- if (texUnit->_GenFlags & TEXGEN_NEED_M) {
- build_m_tab[in->size]( store->tmp_f, store->tmp_m, normal, eye );
- } else if (texUnit->_GenFlags & TEXGEN_NEED_F) {
- build_f_tab[in->size]( (GLfloat *)store->tmp_f, 3, normal, eye );
- }
-
- if (!in) {
- ASSERT(0);
- in = out;
- in->count = VB->Count;
-
- out->size = store->TexgenSize[unit];
- out->flags |= texUnit->TexGenEnabled;
- out->count = VB->Count;
- holes = store->TexgenHoles[unit];
- }
- else {
- GLuint copy = (all_bits[in->size] & ~texUnit->TexGenEnabled);
- if (copy)
- _mesa_copy_tab[copy]( out, in );
-
- out->size = MAX2(in->size, store->TexgenSize[unit]);
- out->flags |= (in->flags & VEC_SIZE_FLAGS) | texUnit->TexGenEnabled;
- out->count = in->count;
-
- holes = ~all_bits[in->size] & store->TexgenHoles[unit];
- }
-
- if (holes) {
- if (holes & VEC_DIRTY_2) _mesa_vector4f_clean_elem(out, count, 2);
- if (holes & VEC_DIRTY_1) _mesa_vector4f_clean_elem(out, count, 1);
- if (holes & VEC_DIRTY_0) _mesa_vector4f_clean_elem(out, count, 0);
- }
-
- if (texUnit->TexGenEnabled & S_BIT) {
- GLuint i;
- switch (texUnit->GenModeS) {
- case GL_OBJECT_LINEAR:
- _mesa_dotprod_tab[obj->size]( (GLfloat *)out->data,
- sizeof(out->data[0]), obj,
- texUnit->ObjectPlaneS );
- break;
- case GL_EYE_LINEAR:
- _mesa_dotprod_tab[eye->size]( (GLfloat *)out->data,
- sizeof(out->data[0]), eye,
- texUnit->EyePlaneS );
- break;
- case GL_SPHERE_MAP:
- for (indata=in->start,i=0 ; i<count ;i++, STRIDE_F(indata,in->stride))
- texcoord[i][0] = indata[0] * m[i] + 0.5F;
- break;
- case GL_REFLECTION_MAP_NV:
- for (i=0;i<count;i++)
- texcoord[i][0] = f[i][0];
- break;
- case GL_NORMAL_MAP_NV: {
- const GLfloat *norm = normal->start;
- for (i=0;i<count;i++, STRIDE_F(norm, normal->stride)) {
- texcoord[i][0] = norm[0];
- }
- break;
- }
- default:
- _mesa_problem(ctx, "Bad S texgen");
- }
- }
-
- if (texUnit->TexGenEnabled & T_BIT) {
- GLuint i;
- switch (texUnit->GenModeT) {
- case GL_OBJECT_LINEAR:
- _mesa_dotprod_tab[obj->size]( &(out->data[0][1]),
- sizeof(out->data[0]), obj,
- texUnit->ObjectPlaneT );
- break;
- case GL_EYE_LINEAR:
- _mesa_dotprod_tab[eye->size]( &(out->data[0][1]),
- sizeof(out->data[0]), eye,
- texUnit->EyePlaneT );
- break;
- case GL_SPHERE_MAP:
- for (indata=in->start,i=0; i<count ;i++,STRIDE_F(indata,in->stride))
- texcoord[i][1] = indata[1] * m[i] + 0.5F;
- break;
- case GL_REFLECTION_MAP_NV:
- for (i=0;i<count;i++)
- texcoord[i][0] = f[i][0];
- break;
- case GL_NORMAL_MAP_NV: {
- const GLfloat *norm = normal->start;
- for (i=0;i<count;i++, STRIDE_F(norm, normal->stride)) {
- texcoord[i][1] = norm[1];
- }
- break;
- }
- default:
- _mesa_problem(ctx, "Bad T texgen");
- }
- }
-
- if (texUnit->TexGenEnabled & R_BIT) {
- GLuint i;
- switch (texUnit->GenModeR) {
- case GL_OBJECT_LINEAR:
- _mesa_dotprod_tab[obj->size]( &(out->data[0][2]),
- sizeof(out->data[0]), obj,
- texUnit->ObjectPlaneR );
- break;
- case GL_EYE_LINEAR:
- _mesa_dotprod_tab[eye->size]( &(out->data[0][2]),
- sizeof(out->data[0]), eye,
- texUnit->EyePlaneR );
- break;
- case GL_REFLECTION_MAP_NV:
- for (i=0;i<count;i++)
- texcoord[i][2] = f[i][2];
- break;
- case GL_NORMAL_MAP_NV: {
- const GLfloat *norm = normal->start;
- for (i=0;i<count;i++,STRIDE_F(norm, normal->stride)) {
- texcoord[i][2] = norm[2];
- }
- break;
- }
- default:
- _mesa_problem(ctx, "Bad R texgen");
- }
- }
-
- if (texUnit->TexGenEnabled & Q_BIT) {
- switch (texUnit->GenModeQ) {
- case GL_OBJECT_LINEAR:
- _mesa_dotprod_tab[obj->size]( &(out->data[0][3]),
- sizeof(out->data[0]), obj,
- texUnit->ObjectPlaneQ );
- break;
- case GL_EYE_LINEAR:
- _mesa_dotprod_tab[eye->size]( &(out->data[0][3]),
- sizeof(out->data[0]), eye,
- texUnit->EyePlaneQ );
- break;
- default:
- _mesa_problem(ctx, "Bad Q texgen");
- }
- }
- }
-
-
-
- static GLboolean run_texgen_stage( GLcontext *ctx,
- struct gl_pipeline_stage *stage )
- {
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- struct texgen_stage_data *store = TEXGEN_STAGE_DATA( stage );
- GLuint i;
-
- for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
- if (ctx->Texture._TexGenEnabled & ENABLE_TEXGEN(i)) {
- if (stage->changed_inputs & (VERT_BIT_EYE | VERT_BIT_NORMAL | VERT_BIT_TEX(i)))
- store->TexgenFunc[i]( ctx, store, i );
-
- VB->TexCoordPtr[i] = &store->texcoord[i];
- }
-
- return GL_TRUE;
- }
-
-
-
-
- static GLboolean run_validate_texgen_stage( GLcontext *ctx,
- struct gl_pipeline_stage *stage )
- {
- struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage);
- GLuint i;
-
- for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++) {
- struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
-
- if (texUnit->TexGenEnabled) {
- GLuint sz;
-
- if (texUnit->TexGenEnabled & R_BIT)
- sz = 4;
- else if (texUnit->TexGenEnabled & Q_BIT)
- sz = 3;
- else if (texUnit->TexGenEnabled & T_BIT)
- sz = 2;
- else
- sz = 1;
-
- store->TexgenSize[i] = sz;
- store->TexgenHoles[i] = (all_bits[sz] & ~texUnit->TexGenEnabled);
- store->TexgenFunc[i] = texgen;
-
- if (texUnit->TexGenEnabled == (S_BIT|T_BIT|R_BIT)) {
- if (texUnit->_GenFlags == TEXGEN_REFLECTION_MAP_NV) {
- store->TexgenFunc[i] = texgen_reflection_map_nv;
- }
- else if (texUnit->_GenFlags == TEXGEN_NORMAL_MAP_NV) {
- store->TexgenFunc[i] = texgen_normal_map_nv;
- }
- }
- else if (texUnit->TexGenEnabled == (S_BIT|T_BIT) &&
- texUnit->_GenFlags == TEXGEN_SPHERE_MAP) {
- store->TexgenFunc[i] = texgen_sphere_map;
- }
- }
- }
-
- stage->run = run_texgen_stage;
- return stage->run( ctx, stage );
- }
-
-
- static void check_texgen( GLcontext *ctx, struct gl_pipeline_stage *stage )
- {
- GLuint i;
- stage->active = 0;
-
- if (ctx->Texture._TexGenEnabled && !ctx->VertexProgram.Enabled) {
- GLuint inputs = 0;
- GLuint outputs = 0;
-
- if (ctx->Texture._GenFlags & TEXGEN_OBJ_LINEAR)
- inputs |= VERT_BIT_POS;
-
- if (ctx->Texture._GenFlags & TEXGEN_NEED_EYE_COORD)
- inputs |= VERT_BIT_EYE;
-
- if (ctx->Texture._GenFlags & TEXGEN_NEED_NORMALS)
- inputs |= VERT_BIT_NORMAL;
-
- for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
- if (ctx->Texture._TexGenEnabled & ENABLE_TEXGEN(i))
- {
- outputs |= VERT_BIT_TEX(i);
-
- /* Need the original input in case it contains a Q coord:
- * (sigh)
- */
- inputs |= VERT_BIT_TEX(i);
-
- /* Something for Feedback? */
- }
-
- if (stage->privatePtr)
- stage->run = run_validate_texgen_stage;
- stage->active = 1;
- stage->inputs = inputs;
- stage->outputs = outputs;
- }
- }
-
-
-
-
- /* Called the first time stage->run() is invoked.
- */
- static GLboolean alloc_texgen_data( GLcontext *ctx,
- struct gl_pipeline_stage *stage )
- {
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- struct texgen_stage_data *store;
- GLuint i;
-
- stage->privatePtr = CALLOC(sizeof(*store));
- store = TEXGEN_STAGE_DATA(stage);
- if (!store)
- return GL_FALSE;
-
- for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
- _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 );
-
- store->tmp_f = (GLfloat (*)[3]) MALLOC(VB->Size * sizeof(GLfloat) * 3);
- store->tmp_m = (GLfloat *) MALLOC(VB->Size * sizeof(GLfloat));
-
- /* Now validate and run the stage.
- */
- stage->run = run_validate_texgen_stage;
- return stage->run( ctx, stage );
- }
-
-
- static void free_texgen_data( struct gl_pipeline_stage *stage )
-
- {
- struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage);
- GLuint i;
-
- if (store) {
- for (i = 0 ; i < MAX_TEXTURE_UNITS ; i++)
- if (store->texcoord[i].data)
- _mesa_vector4f_free( &store->texcoord[i] );
-
-
- if (store->tmp_f) FREE( store->tmp_f );
- if (store->tmp_m) FREE( store->tmp_m );
- FREE( store );
- stage->privatePtr = NULL;
- }
- }
-
-
-
- const struct gl_pipeline_stage _tnl_texgen_stage =
- {
- "texgen", /* name */
- _NEW_TEXTURE, /* when to call check() */
- _NEW_TEXTURE, /* when to invalidate stored data */
- GL_FALSE, /* active? */
- 0, /* inputs */
- 0, /* outputs */
- 0, /* changed_inputs */
- NULL, /* private data */
- free_texgen_data, /* destructor */
- check_texgen, /* check */
- alloc_texgen_data /* run -- initially set to alloc data */
- };
-