/* * 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: * Brian Paul * Keith Whitwell <keith@tungstengraphics.com> */ /* * Regarding GL_NV_texgen_reflection: * * Portions of this software may use or implement intellectual * property owned and licensed by NVIDIA Corporation. NVIDIA disclaims * any and all warranties with respect to such intellectual property, * including any use thereof or modifications thereto. */ #include "main/glheader.h" #include "main/colormac.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" /*********************************************************************** * Automatic texture coordinate generation (texgen) code. */ struct texgen_stage_data; typedef void (*texgen_func)( struct gl_context *ctx, struct texgen_stage_data *store, GLuint unit); struct texgen_stage_data { /* Per-texunit derived state. */ GLuint TexgenSize[MAX_TEXTURE_COORD_UNITS]; texgen_func TexgenFunc[MAX_TEXTURE_COORD_UNITS]; /* Temporary values used in texgen. */ GLfloat (*tmp_f)[3]; GLfloat *tmp_m; /* Buffered outputs of the stage. */ GLvector4f texcoord[MAX_TEXTURE_COORD_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 * INV_SQRTF(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 * INV_SQRTF(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] = { NULL, NULL, 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] = { NULL, NULL, build_f2, build_f3, build_f3 }; /* Special case texgen functions. */ static void texgen_reflection_map_nv( struct gl_context *ctx, struct texgen_stage_data *store, GLuint unit ) { struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit]; GLvector4f *out = &store->texcoord[unit]; build_f_tab[VB->EyePtr->size]( out->start, out->stride, VB->AttribPtr[_TNL_ATTRIB_NORMAL], VB->EyePtr ); out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_3; out->count = VB->Count; out->size = MAX2(in->size, 3); if (in->size == 4) _mesa_copy_tab[0x8]( out, in ); } static void texgen_normal_map_nv( struct gl_context *ctx, struct texgen_stage_data *store, GLuint unit ) { struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit]; GLvector4f *out = &store->texcoord[unit]; GLvector4f *normal = VB->AttribPtr[_TNL_ATTRIB_NORMAL]; 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]; } out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_3; out->count = count; out->size = MAX2(in->size, 3); if (in->size == 4) _mesa_copy_tab[0x8]( out, in ); } static void texgen_sphere_map( struct gl_context *ctx, struct texgen_stage_data *store, GLuint unit ) { struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + 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; (build_m_tab[VB->EyePtr->size])( store->tmp_f, store->tmp_m, VB->AttribPtr[_TNL_ATTRIB_NORMAL], VB->EyePtr ); out->size = MAX2(in->size,2); 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; } out->count = 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 ); } static void texgen( struct gl_context *ctx, struct texgen_stage_data *store, GLuint unit ) { TNLcontext *tnl = TNL_CONTEXT(ctx); struct vertex_buffer *VB = &tnl->vb; GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit]; GLvector4f *out = &store->texcoord[unit]; const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit]; const GLvector4f *obj = VB->AttribPtr[_TNL_ATTRIB_POS]; const GLvector4f *eye = VB->EyePtr; const GLvector4f *normal = VB->AttribPtr[_TNL_ATTRIB_NORMAL]; const GLfloat *m = store->tmp_m; const GLuint count = VB->Count; GLfloat (*texcoord)[4] = (GLfloat (*)[4])out->data; GLfloat (*f)[3] = store->tmp_f; GLuint copy; if (texUnit->_GenFlags & TEXGEN_NEED_M) { build_m_tab[eye->size]( store->tmp_f, store->tmp_m, normal, eye ); } else if (texUnit->_GenFlags & TEXGEN_NEED_F) { build_f_tab[eye->size]( (GLfloat *)store->tmp_f, 3, normal, eye ); } out->size = MAX2(in->size, store->TexgenSize[unit]); out->flags |= (in->flags & VEC_SIZE_FLAGS) | texUnit->TexGenEnabled; out->count = count; copy = (all_bits[in->size] & ~texUnit->TexGenEnabled); if (copy) _mesa_copy_tab[copy]( out, in ); if (texUnit->TexGenEnabled & S_BIT) { GLuint i; switch (texUnit->GenS.Mode) { case GL_OBJECT_LINEAR: _mesa_dotprod_tab[obj->size]( (GLfloat *)out->data, sizeof(out->data[0]), obj, texUnit->GenS.ObjectPlane ); break; case GL_EYE_LINEAR: _mesa_dotprod_tab[eye->size]( (GLfloat *)out->data, sizeof(out->data[0]), eye, texUnit->GenS.EyePlane ); break; case GL_SPHERE_MAP: for (i = 0; i < count; i++) texcoord[i][0] = f[i][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->GenT.Mode) { case GL_OBJECT_LINEAR: _mesa_dotprod_tab[obj->size]( &(out->data[0][1]), sizeof(out->data[0]), obj, texUnit->GenT.ObjectPlane ); break; case GL_EYE_LINEAR: _mesa_dotprod_tab[eye->size]( &(out->data[0][1]), sizeof(out->data[0]), eye, texUnit->GenT.EyePlane ); break; case GL_SPHERE_MAP: for (i = 0; i < count; i++) texcoord[i][1] = f[i][1] * m[i] + 0.5F; break; case GL_REFLECTION_MAP_NV: for (i=0;i<count;i++) texcoord[i][1] = f[i][1]; 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->GenR.Mode) { case GL_OBJECT_LINEAR: _mesa_dotprod_tab[obj->size]( &(out->data[0][2]), sizeof(out->data[0]), obj, texUnit->GenR.ObjectPlane ); break; case GL_EYE_LINEAR: _mesa_dotprod_tab[eye->size]( &(out->data[0][2]), sizeof(out->data[0]), eye, texUnit->GenR.EyePlane ); 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->GenQ.Mode) { case GL_OBJECT_LINEAR: _mesa_dotprod_tab[obj->size]( &(out->data[0][3]), sizeof(out->data[0]), obj, texUnit->GenQ.ObjectPlane ); break; case GL_EYE_LINEAR: _mesa_dotprod_tab[eye->size]( &(out->data[0][3]), sizeof(out->data[0]), eye, texUnit->GenQ.EyePlane ); break; default: _mesa_problem(ctx, "Bad Q texgen"); } } } static GLboolean run_texgen_stage( struct gl_context *ctx, struct tnl_pipeline_stage *stage ) { struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage); GLuint i; if (!ctx->Texture._TexGenEnabled || ctx->VertexProgram._Current) return GL_TRUE; for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) { struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i]; if (texUnit->TexGenEnabled) { store->TexgenFunc[i]( ctx, store, i ); VB->AttribPtr[VERT_ATTRIB_TEX0 + i] = &store->texcoord[i]; } } return GL_TRUE; } static void validate_texgen_stage( struct gl_context *ctx, struct tnl_pipeline_stage *stage ) { struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage); GLuint i; if (!ctx->Texture._TexGenEnabled || ctx->VertexProgram._Current) return; for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) { struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i]; if (texUnit->TexGenEnabled) { GLuint sz; if (texUnit->TexGenEnabled & Q_BIT) sz = 4; else if (texUnit->TexGenEnabled & R_BIT) sz = 3; else if (texUnit->TexGenEnabled & T_BIT) sz = 2; else sz = 1; store->TexgenSize[i] = sz; store->TexgenFunc[i] = texgen; /* general solution */ /* look for special texgen cases */ 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; } } } } /* Called the first time stage->run() is invoked. */ static GLboolean alloc_texgen_data( struct gl_context *ctx, struct tnl_pipeline_stage *stage ) { struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; struct texgen_stage_data *store; GLuint i; stage->privatePtr = calloc(1, sizeof(*store)); store = TEXGEN_STAGE_DATA(stage); if (!store) return GL_FALSE; for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 ); store->tmp_f = malloc(VB->Size * sizeof(GLfloat) * 3); store->tmp_m = malloc(VB->Size * sizeof(GLfloat)); return GL_TRUE; } static void free_texgen_data( struct tnl_pipeline_stage *stage ) { struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage); GLuint i; if (store) { for (i = 0 ; i < MAX_TEXTURE_COORD_UNITS ; i++) if (store->texcoord[i].data) _mesa_vector4f_free( &store->texcoord[i] ); free( store->tmp_f ); free( store->tmp_m ); free( store ); stage->privatePtr = NULL; } } const struct tnl_pipeline_stage _tnl_texgen_stage = { "texgen", /* name */ NULL, /* private data */ alloc_texgen_data, /* destructor */ free_texgen_data, /* destructor */ validate_texgen_stage, /* check */ run_texgen_stage /* run -- initially set to alloc data */ };