diff options
Diffstat (limited to 'mesalib/src/mesa/tnl/t_vb_lighttmp.h')
| -rw-r--r-- | mesalib/src/mesa/tnl/t_vb_lighttmp.h | 1283 |
1 files changed, 632 insertions, 651 deletions
diff --git a/mesalib/src/mesa/tnl/t_vb_lighttmp.h b/mesalib/src/mesa/tnl/t_vb_lighttmp.h index 63b817ab6..1041a24e7 100644 --- a/mesalib/src/mesa/tnl/t_vb_lighttmp.h +++ b/mesalib/src/mesa/tnl/t_vb_lighttmp.h @@ -1,651 +1,632 @@ -/*
- * Mesa 3-D graphics library
- * Version: 5.1
- *
- * Copyright (C) 1999-2003 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>
- */
-
-
-#if IDX & LIGHT_TWOSIDE
-# define NR_SIDES 2
-#else
-# define NR_SIDES 1
-#endif
-
-
-/* define TRACE to trace lighting code */
-/* #define TRACE 1 */
-
-/*
- * ctx is the current context
- * VB is the vertex buffer
- * stage is the lighting stage-private data
- * input is the vector of eye or object-space vertex coordinates
- */
-static void TAG(light_rgba_spec)( struct gl_context *ctx,
- struct vertex_buffer *VB,
- struct tnl_pipeline_stage *stage,
- GLvector4f *input )
-{
- struct light_stage_data *store = LIGHT_STAGE_DATA(stage);
- GLfloat (*base)[3] = ctx->Light._BaseColor;
- GLfloat sumA[2];
- GLuint j;
-
- const GLuint vstride = input->stride;
- const GLfloat *vertex = (GLfloat *)input->data;
- const GLuint nstride = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->stride;
- const GLfloat *normal = (GLfloat *)VB->AttribPtr[_TNL_ATTRIB_NORMAL]->data;
-
- GLfloat (*Fcolor)[4] = (GLfloat (*)[4]) store->LitColor[0].data;
- GLfloat (*Fspec)[4] = (GLfloat (*)[4]) store->LitSecondary[0].data;
-#if IDX & LIGHT_TWOSIDE
- GLfloat (*Bcolor)[4] = (GLfloat (*)[4]) store->LitColor[1].data;
- GLfloat (*Bspec)[4] = (GLfloat (*)[4]) store->LitSecondary[1].data;
-#endif
-
- const GLuint nr = VB->Count;
-
-#ifdef TRACE
- fprintf(stderr, "%s\n", __FUNCTION__ );
-#endif
-
- VB->AttribPtr[_TNL_ATTRIB_COLOR0] = &store->LitColor[0];
- VB->AttribPtr[_TNL_ATTRIB_COLOR1] = &store->LitSecondary[0];
- sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
-
-#if IDX & LIGHT_TWOSIDE
- VB->BackfaceColorPtr = &store->LitColor[1];
- VB->BackfaceSecondaryColorPtr = &store->LitSecondary[1];
- sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
-#endif
-
-
- store->LitColor[0].stride = 16;
- store->LitColor[1].stride = 16;
-
- for (j = 0; j < nr; j++,STRIDE_F(vertex,vstride),STRIDE_F(normal,nstride)) {
- GLfloat sum[2][3], spec[2][3];
- struct gl_light *light;
-
-#if IDX & LIGHT_MATERIAL
- update_materials( ctx, store );
- sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
-#if IDX & LIGHT_TWOSIDE
- sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
-#endif
-#endif
-
- COPY_3V(sum[0], base[0]);
- ZERO_3V(spec[0]);
-
-#if IDX & LIGHT_TWOSIDE
- COPY_3V(sum[1], base[1]);
- ZERO_3V(spec[1]);
-#endif
-
- /* Add contribution from each enabled light source */
- foreach (light, &ctx->Light.EnabledList) {
- GLfloat n_dot_h;
- GLfloat correction;
- GLint side;
- GLfloat contrib[3];
- GLfloat attenuation;
- GLfloat VP[3]; /* unit vector from vertex to light */
- GLfloat n_dot_VP; /* n dot VP */
- GLfloat *h;
-
- /* compute VP and attenuation */
- if (!(light->_Flags & LIGHT_POSITIONAL)) {
- /* directional light */
- COPY_3V(VP, light->_VP_inf_norm);
- attenuation = light->_VP_inf_spot_attenuation;
- }
- else {
- GLfloat d; /* distance from vertex to light */
-
- SUB_3V(VP, light->_Position, vertex);
-
- d = (GLfloat) LEN_3FV( VP );
-
- if (d > 1e-6) {
- GLfloat invd = 1.0F / d;
- SELF_SCALE_SCALAR_3V(VP, invd);
- }
-
- attenuation = 1.0F / (light->ConstantAttenuation + d *
- (light->LinearAttenuation + d *
- light->QuadraticAttenuation));
-
- /* spotlight attenuation */
- if (light->_Flags & LIGHT_SPOT) {
- GLfloat PV_dot_dir = - DOT3(VP, light->_NormSpotDirection);
-
- if (PV_dot_dir<light->_CosCutoff) {
- continue; /* this light makes no contribution */
- }
- else {
- GLdouble x = PV_dot_dir * (EXP_TABLE_SIZE-1);
- GLint k = (GLint) x;
- GLfloat spot = (GLfloat) (light->_SpotExpTable[k][0]
- + (x-k)*light->_SpotExpTable[k][1]);
- attenuation *= spot;
- }
- }
- }
-
- if (attenuation < 1e-3)
- continue; /* this light makes no contribution */
-
- /* Compute dot product or normal and vector from V to light pos */
- n_dot_VP = DOT3( normal, VP );
-
- /* Which side gets the diffuse & specular terms? */
- if (n_dot_VP < 0.0F) {
- ACC_SCALE_SCALAR_3V(sum[0], attenuation, light->_MatAmbient[0]);
-#if IDX & LIGHT_TWOSIDE
- side = 1;
- correction = -1;
- n_dot_VP = -n_dot_VP;
-#else
- continue;
-#endif
- }
- else {
-#if IDX & LIGHT_TWOSIDE
- ACC_SCALE_SCALAR_3V( sum[1], attenuation, light->_MatAmbient[1]);
-#endif
- side = 0;
- correction = 1;
- }
-
- /* diffuse term */
- COPY_3V(contrib, light->_MatAmbient[side]);
- ACC_SCALE_SCALAR_3V(contrib, n_dot_VP, light->_MatDiffuse[side]);
- ACC_SCALE_SCALAR_3V(sum[side], attenuation, contrib );
-
- /* specular term - cannibalize VP... */
- if (ctx->Light.Model.LocalViewer) {
- GLfloat v[3];
- COPY_3V(v, vertex);
- NORMALIZE_3FV(v);
- SUB_3V(VP, VP, v); /* h = VP + VPe */
- h = VP;
- NORMALIZE_3FV(h);
- }
- else if (light->_Flags & LIGHT_POSITIONAL) {
- h = VP;
- ACC_3V(h, ctx->_EyeZDir);
- NORMALIZE_3FV(h);
- }
- else {
- h = light->_h_inf_norm;
- }
-
- n_dot_h = correction * DOT3(normal, h);
-
- if (n_dot_h > 0.0F) {
- GLfloat spec_coef;
- struct gl_shine_tab *tab = ctx->_ShineTable[side];
- GET_SHINE_TAB_ENTRY( tab, n_dot_h, spec_coef );
-
- if (spec_coef > 1.0e-10) {
- spec_coef *= attenuation;
- ACC_SCALE_SCALAR_3V( spec[side], spec_coef,
- light->_MatSpecular[side]);
- }
- }
- } /*loop over lights*/
-
- COPY_3V( Fcolor[j], sum[0] );
- COPY_3V( Fspec[j], spec[0] );
- Fcolor[j][3] = sumA[0];
-
-#if IDX & LIGHT_TWOSIDE
- COPY_3V( Bcolor[j], sum[1] );
- COPY_3V( Bspec[j], spec[1] );
- Bcolor[j][3] = sumA[1];
-#endif
- }
-}
-
-
-static void TAG(light_rgba)( struct gl_context *ctx,
- struct vertex_buffer *VB,
- struct tnl_pipeline_stage *stage,
- GLvector4f *input )
-{
- struct light_stage_data *store = LIGHT_STAGE_DATA(stage);
- GLuint j;
-
- GLfloat (*base)[3] = ctx->Light._BaseColor;
- GLfloat sumA[2];
-
- const GLuint vstride = input->stride;
- const GLfloat *vertex = (GLfloat *) input->data;
- const GLuint nstride = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->stride;
- const GLfloat *normal = (GLfloat *)VB->AttribPtr[_TNL_ATTRIB_NORMAL]->data;
-
- GLfloat (*Fcolor)[4] = (GLfloat (*)[4]) store->LitColor[0].data;
-#if IDX & LIGHT_TWOSIDE
- GLfloat (*Bcolor)[4] = (GLfloat (*)[4]) store->LitColor[1].data;
-#endif
-
- const GLuint nr = VB->Count;
-
-#ifdef TRACE
- fprintf(stderr, "%s\n", __FUNCTION__ );
-#endif
-
- VB->AttribPtr[_TNL_ATTRIB_COLOR0] = &store->LitColor[0];
- sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
-
-#if IDX & LIGHT_TWOSIDE
- VB->BackfaceColorPtr = &store->LitColor[1];
- sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
-#endif
-
- store->LitColor[0].stride = 16;
- store->LitColor[1].stride = 16;
-
- for (j = 0; j < nr; j++,STRIDE_F(vertex,vstride),STRIDE_F(normal,nstride)) {
- GLfloat sum[2][3];
- struct gl_light *light;
-
-#if IDX & LIGHT_MATERIAL
- update_materials( ctx, store );
- sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
-#if IDX & LIGHT_TWOSIDE
- sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
-#endif
-#endif
-
- COPY_3V(sum[0], base[0]);
-
-#if IDX & LIGHT_TWOSIDE
- COPY_3V(sum[1], base[1]);
-#endif
-
- /* Add contribution from each enabled light source */
- foreach (light, &ctx->Light.EnabledList) {
-
- GLfloat n_dot_h;
- GLfloat correction;
- GLint side;
- GLfloat contrib[3];
- GLfloat attenuation = 1.0;
- GLfloat VP[3]; /* unit vector from vertex to light */
- GLfloat n_dot_VP; /* n dot VP */
- GLfloat *h;
-
- /* compute VP and attenuation */
- if (!(light->_Flags & LIGHT_POSITIONAL)) {
- /* directional light */
- COPY_3V(VP, light->_VP_inf_norm);
- attenuation = light->_VP_inf_spot_attenuation;
- }
- else {
- GLfloat d; /* distance from vertex to light */
-
-
- SUB_3V(VP, light->_Position, vertex);
-
- d = (GLfloat) LEN_3FV( VP );
-
- if ( d > 1e-6) {
- GLfloat invd = 1.0F / d;
- SELF_SCALE_SCALAR_3V(VP, invd);
- }
-
- attenuation = 1.0F / (light->ConstantAttenuation + d *
- (light->LinearAttenuation + d *
- light->QuadraticAttenuation));
-
- /* spotlight attenuation */
- if (light->_Flags & LIGHT_SPOT) {
- GLfloat PV_dot_dir = - DOT3(VP, light->_NormSpotDirection);
-
- if (PV_dot_dir<light->_CosCutoff) {
- continue; /* this light makes no contribution */
- }
- else {
- GLdouble x = PV_dot_dir * (EXP_TABLE_SIZE-1);
- GLint k = (GLint) x;
- GLfloat spot = (GLfloat) (light->_SpotExpTable[k][0]
- + (x-k)*light->_SpotExpTable[k][1]);
- attenuation *= spot;
- }
- }
- }
-
- if (attenuation < 1e-3)
- continue; /* this light makes no contribution */
-
- /* Compute dot product or normal and vector from V to light pos */
- n_dot_VP = DOT3( normal, VP );
-
- /* which side are we lighting? */
- if (n_dot_VP < 0.0F) {
- ACC_SCALE_SCALAR_3V(sum[0], attenuation, light->_MatAmbient[0]);
-#if IDX & LIGHT_TWOSIDE
- side = 1;
- correction = -1;
- n_dot_VP = -n_dot_VP;
-#else
- continue;
-#endif
- }
- else {
-#if IDX & LIGHT_TWOSIDE
- ACC_SCALE_SCALAR_3V( sum[1], attenuation, light->_MatAmbient[1]);
-#endif
- side = 0;
- correction = 1;
- }
-
- COPY_3V(contrib, light->_MatAmbient[side]);
-
- /* diffuse term */
- ACC_SCALE_SCALAR_3V(contrib, n_dot_VP, light->_MatDiffuse[side]);
-
- /* specular term - cannibalize VP... */
- {
- if (ctx->Light.Model.LocalViewer) {
- GLfloat v[3];
- COPY_3V(v, vertex);
- NORMALIZE_3FV(v);
- SUB_3V(VP, VP, v); /* h = VP + VPe */
- h = VP;
- NORMALIZE_3FV(h);
- }
- else if (light->_Flags & LIGHT_POSITIONAL) {
- h = VP;
- ACC_3V(h, ctx->_EyeZDir);
- NORMALIZE_3FV(h);
- }
- else {
- h = light->_h_inf_norm;
- }
-
- n_dot_h = correction * DOT3(normal, h);
-
- if (n_dot_h > 0.0F)
- {
- GLfloat spec_coef;
- struct gl_shine_tab *tab = ctx->_ShineTable[side];
-
- GET_SHINE_TAB_ENTRY( tab, n_dot_h, spec_coef );
-
- ACC_SCALE_SCALAR_3V( contrib, spec_coef,
- light->_MatSpecular[side]);
- }
- }
-
- ACC_SCALE_SCALAR_3V( sum[side], attenuation, contrib );
- }
-
- COPY_3V( Fcolor[j], sum[0] );
- Fcolor[j][3] = sumA[0];
-
-#if IDX & LIGHT_TWOSIDE
- COPY_3V( Bcolor[j], sum[1] );
- Bcolor[j][3] = sumA[1];
-#endif
- }
-}
-
-
-
-
-/* As below, but with just a single light.
- */
-static void TAG(light_fast_rgba_single)( struct gl_context *ctx,
- struct vertex_buffer *VB,
- struct tnl_pipeline_stage *stage,
- GLvector4f *input )
-
-{
- struct light_stage_data *store = LIGHT_STAGE_DATA(stage);
- const GLuint nstride = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->stride;
- const GLfloat *normal = (GLfloat *)VB->AttribPtr[_TNL_ATTRIB_NORMAL]->data;
- GLfloat (*Fcolor)[4] = (GLfloat (*)[4]) store->LitColor[0].data;
-#if IDX & LIGHT_TWOSIDE
- GLfloat (*Bcolor)[4] = (GLfloat (*)[4]) store->LitColor[1].data;
-#endif
- const struct gl_light *light = ctx->Light.EnabledList.next;
- GLuint j = 0;
- GLfloat base[2][4];
-#if IDX & LIGHT_MATERIAL
- const GLuint nr = VB->Count;
-#else
- const GLuint nr = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->count;
-#endif
-
-#ifdef TRACE
- fprintf(stderr, "%s\n", __FUNCTION__ );
-#endif
-
- (void) input; /* doesn't refer to Eye or Obj */
-
- VB->AttribPtr[_TNL_ATTRIB_COLOR0] = &store->LitColor[0];
-#if IDX & LIGHT_TWOSIDE
- VB->BackfaceColorPtr = &store->LitColor[1];
-#endif
-
- if (nr > 1) {
- store->LitColor[0].stride = 16;
- store->LitColor[1].stride = 16;
- }
- else {
- store->LitColor[0].stride = 0;
- store->LitColor[1].stride = 0;
- }
-
- for (j = 0; j < nr; j++, STRIDE_F(normal,nstride)) {
-
- GLfloat n_dot_VP;
-
-#if IDX & LIGHT_MATERIAL
- update_materials( ctx, store );
-#endif
-
- /* No attenuation, so incoporate _MatAmbient into base color.
- */
-#if !(IDX & LIGHT_MATERIAL)
- if ( j == 0 )
-#endif
- {
- COPY_3V(base[0], light->_MatAmbient[0]);
- ACC_3V(base[0], ctx->Light._BaseColor[0] );
- base[0][3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
-
-#if IDX & LIGHT_TWOSIDE
- COPY_3V(base[1], light->_MatAmbient[1]);
- ACC_3V(base[1], ctx->Light._BaseColor[1]);
- base[1][3] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
-#endif
- }
-
- n_dot_VP = DOT3(normal, light->_VP_inf_norm);
-
- if (n_dot_VP < 0.0F) {
-#if IDX & LIGHT_TWOSIDE
- GLfloat n_dot_h = -DOT3(normal, light->_h_inf_norm);
- GLfloat sum[3];
- COPY_3V(sum, base[1]);
- ACC_SCALE_SCALAR_3V(sum, -n_dot_VP, light->_MatDiffuse[1]);
- if (n_dot_h > 0.0F) {
- GLfloat spec;
- GET_SHINE_TAB_ENTRY( ctx->_ShineTable[1], n_dot_h, spec );
- ACC_SCALE_SCALAR_3V(sum, spec, light->_MatSpecular[1]);
- }
- COPY_3V(Bcolor[j], sum );
- Bcolor[j][3] = base[1][3];
-#endif
- COPY_4FV(Fcolor[j], base[0]);
- }
- else {
- GLfloat n_dot_h = DOT3(normal, light->_h_inf_norm);
- GLfloat sum[3];
- COPY_3V(sum, base[0]);
- ACC_SCALE_SCALAR_3V(sum, n_dot_VP, light->_MatDiffuse[0]);
- if (n_dot_h > 0.0F) {
- GLfloat spec;
- GET_SHINE_TAB_ENTRY( ctx->_ShineTable[0], n_dot_h, spec );
- ACC_SCALE_SCALAR_3V(sum, spec, light->_MatSpecular[0]);
-
- }
- COPY_3V(Fcolor[j], sum );
- Fcolor[j][3] = base[0][3];
-#if IDX & LIGHT_TWOSIDE
- COPY_4FV(Bcolor[j], base[1]);
-#endif
- }
- }
-}
-
-
-/* Light infinite lights
- */
-static void TAG(light_fast_rgba)( struct gl_context *ctx,
- struct vertex_buffer *VB,
- struct tnl_pipeline_stage *stage,
- GLvector4f *input )
-{
- struct light_stage_data *store = LIGHT_STAGE_DATA(stage);
- GLfloat sumA[2];
- const GLuint nstride = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->stride;
- const GLfloat *normal = (GLfloat *)VB->AttribPtr[_TNL_ATTRIB_NORMAL]->data;
- GLfloat (*Fcolor)[4] = (GLfloat (*)[4]) store->LitColor[0].data;
-#if IDX & LIGHT_TWOSIDE
- GLfloat (*Bcolor)[4] = (GLfloat (*)[4]) store->LitColor[1].data;
-#endif
- GLuint j = 0;
-#if IDX & LIGHT_MATERIAL
- const GLuint nr = VB->Count;
-#else
- const GLuint nr = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->count;
-#endif
- const struct gl_light *light;
-
-#ifdef TRACE
- fprintf(stderr, "%s %d\n", __FUNCTION__, nr );
-#endif
-
- (void) input;
-
- sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
- sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
-
- VB->AttribPtr[_TNL_ATTRIB_COLOR0] = &store->LitColor[0];
-#if IDX & LIGHT_TWOSIDE
- VB->BackfaceColorPtr = &store->LitColor[1];
-#endif
-
- if (nr > 1) {
- store->LitColor[0].stride = 16;
- store->LitColor[1].stride = 16;
- }
- else {
- store->LitColor[0].stride = 0;
- store->LitColor[1].stride = 0;
- }
-
- for (j = 0; j < nr; j++, STRIDE_F(normal,nstride)) {
-
- GLfloat sum[2][3];
-
-#if IDX & LIGHT_MATERIAL
- update_materials( ctx, store );
-
- sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
-#if IDX & LIGHT_TWOSIDE
- sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
-#endif
-#endif
-
-
- COPY_3V(sum[0], ctx->Light._BaseColor[0]);
-#if IDX & LIGHT_TWOSIDE
- COPY_3V(sum[1], ctx->Light._BaseColor[1]);
-#endif
-
- foreach (light, &ctx->Light.EnabledList) {
- GLfloat n_dot_h, n_dot_VP, spec;
-
- ACC_3V(sum[0], light->_MatAmbient[0]);
-#if IDX & LIGHT_TWOSIDE
- ACC_3V(sum[1], light->_MatAmbient[1]);
-#endif
-
- n_dot_VP = DOT3(normal, light->_VP_inf_norm);
-
- if (n_dot_VP > 0.0F) {
- ACC_SCALE_SCALAR_3V(sum[0], n_dot_VP, light->_MatDiffuse[0]);
- n_dot_h = DOT3(normal, light->_h_inf_norm);
- if (n_dot_h > 0.0F) {
- struct gl_shine_tab *tab = ctx->_ShineTable[0];
- GET_SHINE_TAB_ENTRY( tab, n_dot_h, spec );
- ACC_SCALE_SCALAR_3V( sum[0], spec, light->_MatSpecular[0]);
- }
- }
-#if IDX & LIGHT_TWOSIDE
- else {
- ACC_SCALE_SCALAR_3V(sum[1], -n_dot_VP, light->_MatDiffuse[1]);
- n_dot_h = -DOT3(normal, light->_h_inf_norm);
- if (n_dot_h > 0.0F) {
- struct gl_shine_tab *tab = ctx->_ShineTable[1];
- GET_SHINE_TAB_ENTRY( tab, n_dot_h, spec );
- ACC_SCALE_SCALAR_3V( sum[1], spec, light->_MatSpecular[1]);
- }
- }
-#endif
- }
-
- COPY_3V( Fcolor[j], sum[0] );
- Fcolor[j][3] = sumA[0];
-
-#if IDX & LIGHT_TWOSIDE
- COPY_3V( Bcolor[j], sum[1] );
- Bcolor[j][3] = sumA[1];
-#endif
- }
-}
-
-
-
-
-static void TAG(init_light_tab)( void )
-{
- _tnl_light_tab[IDX] = TAG(light_rgba);
- _tnl_light_fast_tab[IDX] = TAG(light_fast_rgba);
- _tnl_light_fast_single_tab[IDX] = TAG(light_fast_rgba_single);
- _tnl_light_spec_tab[IDX] = TAG(light_rgba_spec);
-}
-
-
-#undef TAG
-#undef IDX
-#undef NR_SIDES
+/* + * Mesa 3-D graphics library + * Version: 5.1 + * + * Copyright (C) 1999-2003 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> + */ + + +#if IDX & LIGHT_TWOSIDE +# define NR_SIDES 2 +#else +# define NR_SIDES 1 +#endif + + +/* define TRACE to trace lighting code */ +/* #define TRACE 1 */ + +/* + * ctx is the current context + * VB is the vertex buffer + * stage is the lighting stage-private data + * input is the vector of eye or object-space vertex coordinates + */ +static void TAG(light_rgba_spec)( struct gl_context *ctx, + struct vertex_buffer *VB, + struct tnl_pipeline_stage *stage, + GLvector4f *input ) +{ + struct light_stage_data *store = LIGHT_STAGE_DATA(stage); + GLfloat (*base)[3] = ctx->Light._BaseColor; + GLfloat sumA[2]; + GLuint j; + + const GLuint vstride = input->stride; + const GLfloat *vertex = (GLfloat *)input->data; + const GLuint nstride = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->stride; + const GLfloat *normal = (GLfloat *)VB->AttribPtr[_TNL_ATTRIB_NORMAL]->data; + + GLfloat (*Fcolor)[4] = (GLfloat (*)[4]) store->LitColor[0].data; + GLfloat (*Fspec)[4] = (GLfloat (*)[4]) store->LitSecondary[0].data; +#if IDX & LIGHT_TWOSIDE + GLfloat (*Bcolor)[4] = (GLfloat (*)[4]) store->LitColor[1].data; + GLfloat (*Bspec)[4] = (GLfloat (*)[4]) store->LitSecondary[1].data; +#endif + + const GLuint nr = VB->Count; + +#ifdef TRACE + fprintf(stderr, "%s\n", __FUNCTION__ ); +#endif + + VB->AttribPtr[_TNL_ATTRIB_COLOR0] = &store->LitColor[0]; + VB->AttribPtr[_TNL_ATTRIB_COLOR1] = &store->LitSecondary[0]; + sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3]; + +#if IDX & LIGHT_TWOSIDE + VB->BackfaceColorPtr = &store->LitColor[1]; + VB->BackfaceSecondaryColorPtr = &store->LitSecondary[1]; + sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3]; +#endif + + + store->LitColor[0].stride = 16; + store->LitColor[1].stride = 16; + + for (j = 0; j < nr; j++,STRIDE_F(vertex,vstride),STRIDE_F(normal,nstride)) { + GLfloat sum[2][3], spec[2][3]; + struct gl_light *light; + +#if IDX & LIGHT_MATERIAL + update_materials( ctx, store ); + sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3]; +#if IDX & LIGHT_TWOSIDE + sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3]; +#endif +#endif + + COPY_3V(sum[0], base[0]); + ZERO_3V(spec[0]); + +#if IDX & LIGHT_TWOSIDE + COPY_3V(sum[1], base[1]); + ZERO_3V(spec[1]); +#endif + + /* Add contribution from each enabled light source */ + foreach (light, &ctx->Light.EnabledList) { + GLfloat n_dot_h; + GLfloat correction; + GLint side; + GLfloat contrib[3]; + GLfloat attenuation; + GLfloat VP[3]; /* unit vector from vertex to light */ + GLfloat n_dot_VP; /* n dot VP */ + GLfloat *h; + + /* compute VP and attenuation */ + if (!(light->_Flags & LIGHT_POSITIONAL)) { + /* directional light */ + COPY_3V(VP, light->_VP_inf_norm); + attenuation = light->_VP_inf_spot_attenuation; + } + else { + GLfloat d; /* distance from vertex to light */ + + SUB_3V(VP, light->_Position, vertex); + + d = (GLfloat) LEN_3FV( VP ); + + if (d > 1e-6) { + GLfloat invd = 1.0F / d; + SELF_SCALE_SCALAR_3V(VP, invd); + } + + attenuation = 1.0F / (light->ConstantAttenuation + d * + (light->LinearAttenuation + d * + light->QuadraticAttenuation)); + + /* spotlight attenuation */ + if (light->_Flags & LIGHT_SPOT) { + GLfloat PV_dot_dir = - DOT3(VP, light->_NormSpotDirection); + + if (PV_dot_dir<light->_CosCutoff) { + continue; /* this light makes no contribution */ + } + else { + GLfloat spot = powf(PV_dot_dir, light->SpotExponent); + attenuation *= spot; + } + } + } + + if (attenuation < 1e-3) + continue; /* this light makes no contribution */ + + /* Compute dot product or normal and vector from V to light pos */ + n_dot_VP = DOT3( normal, VP ); + + /* Which side gets the diffuse & specular terms? */ + if (n_dot_VP < 0.0F) { + ACC_SCALE_SCALAR_3V(sum[0], attenuation, light->_MatAmbient[0]); +#if IDX & LIGHT_TWOSIDE + side = 1; + correction = -1; + n_dot_VP = -n_dot_VP; +#else + continue; +#endif + } + else { +#if IDX & LIGHT_TWOSIDE + ACC_SCALE_SCALAR_3V( sum[1], attenuation, light->_MatAmbient[1]); +#endif + side = 0; + correction = 1; + } + + /* diffuse term */ + COPY_3V(contrib, light->_MatAmbient[side]); + ACC_SCALE_SCALAR_3V(contrib, n_dot_VP, light->_MatDiffuse[side]); + ACC_SCALE_SCALAR_3V(sum[side], attenuation, contrib ); + + /* specular term - cannibalize VP... */ + if (ctx->Light.Model.LocalViewer) { + GLfloat v[3]; + COPY_3V(v, vertex); + NORMALIZE_3FV(v); + SUB_3V(VP, VP, v); /* h = VP + VPe */ + h = VP; + NORMALIZE_3FV(h); + } + else if (light->_Flags & LIGHT_POSITIONAL) { + h = VP; + ACC_3V(h, ctx->_EyeZDir); + NORMALIZE_3FV(h); + } + else { + h = light->_h_inf_norm; + } + + n_dot_h = correction * DOT3(normal, h); + + if (n_dot_h > 0.0F) { + GLfloat spec_coef = _mesa_lookup_shininess(ctx, side, n_dot_h); + if (spec_coef > 1.0e-10) { + spec_coef *= attenuation; + ACC_SCALE_SCALAR_3V( spec[side], spec_coef, + light->_MatSpecular[side]); + } + } + } /*loop over lights*/ + + COPY_3V( Fcolor[j], sum[0] ); + COPY_3V( Fspec[j], spec[0] ); + Fcolor[j][3] = sumA[0]; + +#if IDX & LIGHT_TWOSIDE + COPY_3V( Bcolor[j], sum[1] ); + COPY_3V( Bspec[j], spec[1] ); + Bcolor[j][3] = sumA[1]; +#endif + } +} + + +static void TAG(light_rgba)( struct gl_context *ctx, + struct vertex_buffer *VB, + struct tnl_pipeline_stage *stage, + GLvector4f *input ) +{ + struct light_stage_data *store = LIGHT_STAGE_DATA(stage); + GLuint j; + + GLfloat (*base)[3] = ctx->Light._BaseColor; + GLfloat sumA[2]; + + const GLuint vstride = input->stride; + const GLfloat *vertex = (GLfloat *) input->data; + const GLuint nstride = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->stride; + const GLfloat *normal = (GLfloat *)VB->AttribPtr[_TNL_ATTRIB_NORMAL]->data; + + GLfloat (*Fcolor)[4] = (GLfloat (*)[4]) store->LitColor[0].data; +#if IDX & LIGHT_TWOSIDE + GLfloat (*Bcolor)[4] = (GLfloat (*)[4]) store->LitColor[1].data; +#endif + + const GLuint nr = VB->Count; + +#ifdef TRACE + fprintf(stderr, "%s\n", __FUNCTION__ ); +#endif + + VB->AttribPtr[_TNL_ATTRIB_COLOR0] = &store->LitColor[0]; + sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3]; + +#if IDX & LIGHT_TWOSIDE + VB->BackfaceColorPtr = &store->LitColor[1]; + sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3]; +#endif + + store->LitColor[0].stride = 16; + store->LitColor[1].stride = 16; + + for (j = 0; j < nr; j++,STRIDE_F(vertex,vstride),STRIDE_F(normal,nstride)) { + GLfloat sum[2][3]; + struct gl_light *light; + +#if IDX & LIGHT_MATERIAL + update_materials( ctx, store ); + sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3]; +#if IDX & LIGHT_TWOSIDE + sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3]; +#endif +#endif + + COPY_3V(sum[0], base[0]); + +#if IDX & LIGHT_TWOSIDE + COPY_3V(sum[1], base[1]); +#endif + + /* Add contribution from each enabled light source */ + foreach (light, &ctx->Light.EnabledList) { + + GLfloat n_dot_h; + GLfloat correction; + GLint side; + GLfloat contrib[3]; + GLfloat attenuation = 1.0; + GLfloat VP[3]; /* unit vector from vertex to light */ + GLfloat n_dot_VP; /* n dot VP */ + GLfloat *h; + + /* compute VP and attenuation */ + if (!(light->_Flags & LIGHT_POSITIONAL)) { + /* directional light */ + COPY_3V(VP, light->_VP_inf_norm); + attenuation = light->_VP_inf_spot_attenuation; + } + else { + GLfloat d; /* distance from vertex to light */ + + + SUB_3V(VP, light->_Position, vertex); + + d = (GLfloat) LEN_3FV( VP ); + + if ( d > 1e-6) { + GLfloat invd = 1.0F / d; + SELF_SCALE_SCALAR_3V(VP, invd); + } + + attenuation = 1.0F / (light->ConstantAttenuation + d * + (light->LinearAttenuation + d * + light->QuadraticAttenuation)); + + /* spotlight attenuation */ + if (light->_Flags & LIGHT_SPOT) { + GLfloat PV_dot_dir = - DOT3(VP, light->_NormSpotDirection); + + if (PV_dot_dir<light->_CosCutoff) { + continue; /* this light makes no contribution */ + } + else { + GLfloat spot = powf(PV_dot_dir, light->SpotExponent); + attenuation *= spot; + } + } + } + + if (attenuation < 1e-3) + continue; /* this light makes no contribution */ + + /* Compute dot product or normal and vector from V to light pos */ + n_dot_VP = DOT3( normal, VP ); + + /* which side are we lighting? */ + if (n_dot_VP < 0.0F) { + ACC_SCALE_SCALAR_3V(sum[0], attenuation, light->_MatAmbient[0]); +#if IDX & LIGHT_TWOSIDE + side = 1; + correction = -1; + n_dot_VP = -n_dot_VP; +#else + continue; +#endif + } + else { +#if IDX & LIGHT_TWOSIDE + ACC_SCALE_SCALAR_3V( sum[1], attenuation, light->_MatAmbient[1]); +#endif + side = 0; + correction = 1; + } + + COPY_3V(contrib, light->_MatAmbient[side]); + + /* diffuse term */ + ACC_SCALE_SCALAR_3V(contrib, n_dot_VP, light->_MatDiffuse[side]); + + /* specular term - cannibalize VP... */ + { + if (ctx->Light.Model.LocalViewer) { + GLfloat v[3]; + COPY_3V(v, vertex); + NORMALIZE_3FV(v); + SUB_3V(VP, VP, v); /* h = VP + VPe */ + h = VP; + NORMALIZE_3FV(h); + } + else if (light->_Flags & LIGHT_POSITIONAL) { + h = VP; + ACC_3V(h, ctx->_EyeZDir); + NORMALIZE_3FV(h); + } + else { + h = light->_h_inf_norm; + } + + n_dot_h = correction * DOT3(normal, h); + + if (n_dot_h > 0.0F) { + GLfloat spec_coef = _mesa_lookup_shininess(ctx, side, n_dot_h); + ACC_SCALE_SCALAR_3V( contrib, spec_coef, + light->_MatSpecular[side]); + } + } + + ACC_SCALE_SCALAR_3V( sum[side], attenuation, contrib ); + } + + COPY_3V( Fcolor[j], sum[0] ); + Fcolor[j][3] = sumA[0]; + +#if IDX & LIGHT_TWOSIDE + COPY_3V( Bcolor[j], sum[1] ); + Bcolor[j][3] = sumA[1]; +#endif + } +} + + + + +/* As below, but with just a single light. + */ +static void TAG(light_fast_rgba_single)( struct gl_context *ctx, + struct vertex_buffer *VB, + struct tnl_pipeline_stage *stage, + GLvector4f *input ) + +{ + struct light_stage_data *store = LIGHT_STAGE_DATA(stage); + const GLuint nstride = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->stride; + const GLfloat *normal = (GLfloat *)VB->AttribPtr[_TNL_ATTRIB_NORMAL]->data; + GLfloat (*Fcolor)[4] = (GLfloat (*)[4]) store->LitColor[0].data; +#if IDX & LIGHT_TWOSIDE + GLfloat (*Bcolor)[4] = (GLfloat (*)[4]) store->LitColor[1].data; +#endif + const struct gl_light *light = ctx->Light.EnabledList.next; + GLuint j = 0; + GLfloat base[2][4]; +#if IDX & LIGHT_MATERIAL + const GLuint nr = VB->Count; +#else + const GLuint nr = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->count; +#endif + +#ifdef TRACE + fprintf(stderr, "%s\n", __FUNCTION__ ); +#endif + + (void) input; /* doesn't refer to Eye or Obj */ + + VB->AttribPtr[_TNL_ATTRIB_COLOR0] = &store->LitColor[0]; +#if IDX & LIGHT_TWOSIDE + VB->BackfaceColorPtr = &store->LitColor[1]; +#endif + + if (nr > 1) { + store->LitColor[0].stride = 16; + store->LitColor[1].stride = 16; + } + else { + store->LitColor[0].stride = 0; + store->LitColor[1].stride = 0; + } + + for (j = 0; j < nr; j++, STRIDE_F(normal,nstride)) { + + GLfloat n_dot_VP; + +#if IDX & LIGHT_MATERIAL + update_materials( ctx, store ); +#endif + + /* No attenuation, so incoporate _MatAmbient into base color. + */ +#if !(IDX & LIGHT_MATERIAL) + if ( j == 0 ) +#endif + { + COPY_3V(base[0], light->_MatAmbient[0]); + ACC_3V(base[0], ctx->Light._BaseColor[0] ); + base[0][3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3]; + +#if IDX & LIGHT_TWOSIDE + COPY_3V(base[1], light->_MatAmbient[1]); + ACC_3V(base[1], ctx->Light._BaseColor[1]); + base[1][3] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3]; +#endif + } + + n_dot_VP = DOT3(normal, light->_VP_inf_norm); + + if (n_dot_VP < 0.0F) { +#if IDX & LIGHT_TWOSIDE + GLfloat n_dot_h = -DOT3(normal, light->_h_inf_norm); + GLfloat sum[3]; + COPY_3V(sum, base[1]); + ACC_SCALE_SCALAR_3V(sum, -n_dot_VP, light->_MatDiffuse[1]); + if (n_dot_h > 0.0F) { + GLfloat spec = _mesa_lookup_shininess(ctx, 1, n_dot_h); + ACC_SCALE_SCALAR_3V(sum, spec, light->_MatSpecular[1]); + } + COPY_3V(Bcolor[j], sum ); + Bcolor[j][3] = base[1][3]; +#endif + COPY_4FV(Fcolor[j], base[0]); + } + else { + GLfloat n_dot_h = DOT3(normal, light->_h_inf_norm); + GLfloat sum[3]; + COPY_3V(sum, base[0]); + ACC_SCALE_SCALAR_3V(sum, n_dot_VP, light->_MatDiffuse[0]); + if (n_dot_h > 0.0F) { + GLfloat spec = _mesa_lookup_shininess(ctx, 0, n_dot_h); + ACC_SCALE_SCALAR_3V(sum, spec, light->_MatSpecular[0]); + } + COPY_3V(Fcolor[j], sum ); + Fcolor[j][3] = base[0][3]; +#if IDX & LIGHT_TWOSIDE + COPY_4FV(Bcolor[j], base[1]); +#endif + } + } +} + + +/* Light infinite lights + */ +static void TAG(light_fast_rgba)( struct gl_context *ctx, + struct vertex_buffer *VB, + struct tnl_pipeline_stage *stage, + GLvector4f *input ) +{ + struct light_stage_data *store = LIGHT_STAGE_DATA(stage); + GLfloat sumA[2]; + const GLuint nstride = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->stride; + const GLfloat *normal = (GLfloat *)VB->AttribPtr[_TNL_ATTRIB_NORMAL]->data; + GLfloat (*Fcolor)[4] = (GLfloat (*)[4]) store->LitColor[0].data; +#if IDX & LIGHT_TWOSIDE + GLfloat (*Bcolor)[4] = (GLfloat (*)[4]) store->LitColor[1].data; +#endif + GLuint j = 0; +#if IDX & LIGHT_MATERIAL + const GLuint nr = VB->Count; +#else + const GLuint nr = VB->AttribPtr[_TNL_ATTRIB_NORMAL]->count; +#endif + const struct gl_light *light; + +#ifdef TRACE + fprintf(stderr, "%s %d\n", __FUNCTION__, nr ); +#endif + + (void) input; + + sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3]; + sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3]; + + VB->AttribPtr[_TNL_ATTRIB_COLOR0] = &store->LitColor[0]; +#if IDX & LIGHT_TWOSIDE + VB->BackfaceColorPtr = &store->LitColor[1]; +#endif + + if (nr > 1) { + store->LitColor[0].stride = 16; + store->LitColor[1].stride = 16; + } + else { + store->LitColor[0].stride = 0; + store->LitColor[1].stride = 0; + } + + for (j = 0; j < nr; j++, STRIDE_F(normal,nstride)) { + + GLfloat sum[2][3]; + +#if IDX & LIGHT_MATERIAL + update_materials( ctx, store ); + + sumA[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3]; +#if IDX & LIGHT_TWOSIDE + sumA[1] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3]; +#endif +#endif + + + COPY_3V(sum[0], ctx->Light._BaseColor[0]); +#if IDX & LIGHT_TWOSIDE + COPY_3V(sum[1], ctx->Light._BaseColor[1]); +#endif + + foreach (light, &ctx->Light.EnabledList) { + GLfloat n_dot_h, n_dot_VP, spec; + + ACC_3V(sum[0], light->_MatAmbient[0]); +#if IDX & LIGHT_TWOSIDE + ACC_3V(sum[1], light->_MatAmbient[1]); +#endif + + n_dot_VP = DOT3(normal, light->_VP_inf_norm); + + if (n_dot_VP > 0.0F) { + ACC_SCALE_SCALAR_3V(sum[0], n_dot_VP, light->_MatDiffuse[0]); + n_dot_h = DOT3(normal, light->_h_inf_norm); + if (n_dot_h > 0.0F) { + spec = _mesa_lookup_shininess(ctx, 0, n_dot_h); + ACC_SCALE_SCALAR_3V( sum[0], spec, light->_MatSpecular[0]); + } + } +#if IDX & LIGHT_TWOSIDE + else { + ACC_SCALE_SCALAR_3V(sum[1], -n_dot_VP, light->_MatDiffuse[1]); + n_dot_h = -DOT3(normal, light->_h_inf_norm); + if (n_dot_h > 0.0F) { + spec = _mesa_lookup_shininess(ctx, 1, n_dot_h); + ACC_SCALE_SCALAR_3V( sum[1], spec, light->_MatSpecular[1]); + } + } +#endif + } + + COPY_3V( Fcolor[j], sum[0] ); + Fcolor[j][3] = sumA[0]; + +#if IDX & LIGHT_TWOSIDE + COPY_3V( Bcolor[j], sum[1] ); + Bcolor[j][3] = sumA[1]; +#endif + } +} + + + + +static void TAG(init_light_tab)( void ) +{ + _tnl_light_tab[IDX] = TAG(light_rgba); + _tnl_light_fast_tab[IDX] = TAG(light_fast_rgba); + _tnl_light_fast_single_tab[IDX] = TAG(light_fast_rgba_single); + _tnl_light_spec_tab[IDX] = TAG(light_rgba_spec); +} + + +#undef TAG +#undef IDX +#undef NR_SIDES |