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-rw-r--r--src/mesa/tnl/t_context.c21
-rw-r--r--src/mesa/tnl/t_context.h18
-rw-r--r--src/mesa/tnl/t_vb_light.c134
-rw-r--r--src/mesa/tnl/t_vb_lighttmp.h12
-rw-r--r--src/mesa/tnl/tnl.h3
5 files changed, 179 insertions, 9 deletions
diff --git a/src/mesa/tnl/t_context.c b/src/mesa/tnl/t_context.c
index 1ded44ccffb..ede1d742835 100644
--- a/src/mesa/tnl/t_context.c
+++ b/src/mesa/tnl/t_context.c
@@ -46,6 +46,7 @@ GLboolean
_tnl_CreateContext( struct gl_context *ctx )
{
TNLcontext *tnl;
+ GLuint i;
/* Create the TNLcontext structure
*/
@@ -76,10 +77,21 @@ _tnl_CreateContext( struct gl_context *ctx )
*/
tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
- tnl->Driver.NotifyMaterialChange = _mesa_validate_all_lighting_tables;
+ tnl->Driver.NotifyMaterialChange = _tnl_validate_shine_tables;
tnl->nr_blocks = 0;
+ /* Lighting miscellaneous */
+ tnl->_ShineTabList = MALLOC_STRUCT( tnl_shine_tab );
+ make_empty_list( tnl->_ShineTabList );
+ /* Allocate 10 (arbitrary) shininess lookup tables */
+ for (i = 0 ; i < 10 ; i++) {
+ struct tnl_shine_tab *s = MALLOC_STRUCT( tnl_shine_tab );
+ s->shininess = -1;
+ s->refcount = 0;
+ insert_at_tail( tnl->_ShineTabList, s );
+ }
+
/* plug in the VBO drawing function */
vbo_set_draw_func(ctx, _tnl_vbo_draw_prims);
@@ -93,8 +105,15 @@ _tnl_CreateContext( struct gl_context *ctx )
void
_tnl_DestroyContext( struct gl_context *ctx )
{
+ struct tnl_shine_tab *s, *tmps;
TNLcontext *tnl = TNL_CONTEXT(ctx);
+ /* Free lighting shininess exponentiation table */
+ foreach_s( s, tmps, tnl->_ShineTabList ) {
+ free( s );
+ }
+ free( tnl->_ShineTabList );
+
_tnl_destroy_pipeline( ctx );
FREE(tnl);
diff --git a/src/mesa/tnl/t_context.h b/src/mesa/tnl/t_context.h
index c5a902082b8..8f18ddeb17a 100644
--- a/src/mesa/tnl/t_context.h
+++ b/src/mesa/tnl/t_context.h
@@ -384,6 +384,20 @@ struct tnl_clipspace
};
+#define SHINE_TABLE_SIZE 256 /**< Material shininess lookup table sizes */
+
+/**
+ * Material shininess lookup table.
+ */
+struct tnl_shine_tab
+{
+ struct tnl_shine_tab *next, *prev;
+ GLfloat tab[SHINE_TABLE_SIZE+1];
+ GLfloat shininess;
+ GLuint refcount;
+};
+
+
struct tnl_device_driver
{
/***
@@ -518,6 +532,10 @@ typedef struct
GLuint nr_blocks;
GLuint CurInstance;
+
+ struct tnl_shine_tab *_ShineTable[2]; /**< Active shine tables */
+ struct tnl_shine_tab *_ShineTabList; /**< MRU list of inactive shine tables */
+ /**@}*/
} TNLcontext;
diff --git a/src/mesa/tnl/t_vb_light.c b/src/mesa/tnl/t_vb_light.c
index 3acedf6e577..39467fac731 100644
--- a/src/mesa/tnl/t_vb_light.c
+++ b/src/mesa/tnl/t_vb_light.c
@@ -36,6 +36,7 @@
#include "t_context.h"
#include "t_pipeline.h"
+#include "tnl.h"
#define LIGHT_TWOSIDE 0x1
#define LIGHT_MATERIAL 0x2
@@ -76,6 +77,114 @@ struct light_stage_data {
+/**********************************************************************/
+/***** Lighting computation *****/
+/**********************************************************************/
+
+
+/*
+ * Notes:
+ * When two-sided lighting is enabled we compute the color (or index)
+ * for both the front and back side of the primitive. Then, when the
+ * orientation of the facet is later learned, we can determine which
+ * color (or index) to use for rendering.
+ *
+ * KW: We now know orientation in advance and only shade for
+ * the side or sides which are actually required.
+ *
+ * Variables:
+ * n = normal vector
+ * V = vertex position
+ * P = light source position
+ * Pe = (0,0,0,1)
+ *
+ * Precomputed:
+ * IF P[3]==0 THEN
+ * // light at infinity
+ * IF local_viewer THEN
+ * _VP_inf_norm = unit vector from V to P // Precompute
+ * ELSE
+ * // eye at infinity
+ * _h_inf_norm = Normalize( VP + <0,0,1> ) // Precompute
+ * ENDIF
+ * ENDIF
+ *
+ * Functions:
+ * Normalize( v ) = normalized vector v
+ * Magnitude( v ) = length of vector v
+ */
+
+
+
+static void
+validate_shine_table( struct gl_context *ctx, GLuint side, GLfloat shininess )
+{
+ TNLcontext *tnl = TNL_CONTEXT(ctx);
+ struct tnl_shine_tab *list = tnl->_ShineTabList;
+ struct tnl_shine_tab *s;
+
+ ASSERT(side < 2);
+
+ foreach(s, list)
+ if ( s->shininess == shininess )
+ break;
+
+ if (s == list) {
+ GLint j;
+ GLfloat *m;
+
+ foreach(s, list)
+ if (s->refcount == 0)
+ break;
+
+ m = s->tab;
+ m[0] = 0.0;
+ if (shininess == 0.0) {
+ for (j = 1 ; j <= SHINE_TABLE_SIZE ; j++)
+ m[j] = 1.0;
+ }
+ else {
+ for (j = 1 ; j < SHINE_TABLE_SIZE ; j++) {
+ GLdouble t, x = j / (GLfloat) (SHINE_TABLE_SIZE - 1);
+ if (x < 0.005) /* underflow check */
+ x = 0.005;
+ t = pow(x, shininess);
+ if (t > 1e-20)
+ m[j] = (GLfloat) t;
+ else
+ m[j] = 0.0;
+ }
+ m[SHINE_TABLE_SIZE] = 1.0;
+ }
+
+ s->shininess = shininess;
+ }
+
+ if (tnl->_ShineTable[side])
+ tnl->_ShineTable[side]->refcount--;
+
+ tnl->_ShineTable[side] = s;
+ move_to_tail( list, s );
+ s->refcount++;
+}
+
+
+void
+_tnl_validate_shine_tables( struct gl_context *ctx )
+{
+ TNLcontext *tnl = TNL_CONTEXT(ctx);
+ GLfloat shininess;
+
+ shininess = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SHININESS][0];
+ if (!tnl->_ShineTable[0] || tnl->_ShineTable[0]->shininess != shininess)
+ validate_shine_table( ctx, 0, shininess );
+
+ shininess = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SHININESS][0];
+ if (!tnl->_ShineTable[1] || tnl->_ShineTable[1]->shininess != shininess)
+ validate_shine_table( ctx, 1, shininess );
+}
+
+
/**
* In the case of colormaterial, the effected material attributes
* should already have been bound to point to the incoming color data,
@@ -101,7 +210,7 @@ update_materials(struct gl_context *ctx, struct light_stage_data *store)
/* XXX we should only call this if we're tracking/changing the specular
* exponent.
*/
- _mesa_validate_all_lighting_tables( ctx );
+ _tnl_validate_shine_tables( ctx );
}
@@ -149,11 +258,32 @@ prepare_materials(struct gl_context *ctx,
/* FIXME: Is this already done?
*/
_mesa_update_material( ctx, ~0 );
- _mesa_validate_all_lighting_tables( ctx );
+
+ _tnl_validate_shine_tables( ctx );
return store->mat_count;
}
+/*
+ * Compute dp ^ SpecularExponent.
+ * Lerp between adjacent values in the f(x) lookup table, giving a
+ * continuous function, with adequate overall accuracy. (Though still
+ * pretty good compared to a straight lookup).
+ */
+static inline GLfloat
+lookup_shininess(const struct gl_context *ctx, GLuint face, GLfloat dp)
+{
+ TNLcontext *tnl = TNL_CONTEXT(ctx);
+ const struct tnl_shine_tab *tab = tnl->_ShineTable[face];
+ float f = dp * (SHINE_TABLE_SIZE - 1);
+ int k = (int) f;
+ if (k < 0 /* gcc may cast an overflow float value to negative int value */
+ || k > SHINE_TABLE_SIZE - 2)
+ return powf(dp, tab->shininess);
+ else
+ return tab->tab[k] + (f - k) * (tab->tab[k+1] - tab->tab[k]);
+}
+
/* Tables for all the shading functions.
*/
static light_func _tnl_light_tab[MAX_LIGHT_FUNC];
diff --git a/src/mesa/tnl/t_vb_lighttmp.h b/src/mesa/tnl/t_vb_lighttmp.h
index 1041a24e761..1944e5ddc6d 100644
--- a/src/mesa/tnl/t_vb_lighttmp.h
+++ b/src/mesa/tnl/t_vb_lighttmp.h
@@ -204,7 +204,7 @@ static void TAG(light_rgba_spec)( struct gl_context *ctx,
n_dot_h = correction * DOT3(normal, h);
if (n_dot_h > 0.0F) {
- GLfloat spec_coef = _mesa_lookup_shininess(ctx, side, n_dot_h);
+ GLfloat spec_coef = lookup_shininess(ctx, side, n_dot_h);
if (spec_coef > 1.0e-10) {
spec_coef *= attenuation;
ACC_SCALE_SCALAR_3V( spec[side], spec_coef,
@@ -383,7 +383,7 @@ static void TAG(light_rgba)( struct gl_context *ctx,
n_dot_h = correction * DOT3(normal, h);
if (n_dot_h > 0.0F) {
- GLfloat spec_coef = _mesa_lookup_shininess(ctx, side, n_dot_h);
+ GLfloat spec_coef = lookup_shininess(ctx, side, n_dot_h);
ACC_SCALE_SCALAR_3V( contrib, spec_coef,
light->_MatSpecular[side]);
}
@@ -483,7 +483,7 @@ static void TAG(light_fast_rgba_single)( struct gl_context *ctx,
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);
+ GLfloat spec = lookup_shininess(ctx, 1, n_dot_h);
ACC_SCALE_SCALAR_3V(sum, spec, light->_MatSpecular[1]);
}
COPY_3V(Bcolor[j], sum );
@@ -497,7 +497,7 @@ static void TAG(light_fast_rgba_single)( struct gl_context *ctx,
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);
+ GLfloat spec = lookup_shininess(ctx, 0, n_dot_h);
ACC_SCALE_SCALAR_3V(sum, spec, light->_MatSpecular[0]);
}
COPY_3V(Fcolor[j], sum );
@@ -589,7 +589,7 @@ static void TAG(light_fast_rgba)( struct gl_context *ctx,
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);
+ spec = lookup_shininess(ctx, 0, n_dot_h);
ACC_SCALE_SCALAR_3V( sum[0], spec, light->_MatSpecular[0]);
}
}
@@ -598,7 +598,7 @@ static void TAG(light_fast_rgba)( struct gl_context *ctx,
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);
+ spec = lookup_shininess(ctx, 1, n_dot_h);
ACC_SCALE_SCALAR_3V( sum[1], spec, light->_MatSpecular[1]);
}
}
diff --git a/src/mesa/tnl/tnl.h b/src/mesa/tnl/tnl.h
index d3889811e21..434bd7fcd95 100644
--- a/src/mesa/tnl/tnl.h
+++ b/src/mesa/tnl/tnl.h
@@ -101,4 +101,7 @@ _mesa_load_tracked_matrices(struct gl_context *ctx);
extern void
_tnl_RasterPos(struct gl_context *ctx, const GLfloat vObj[4]);
+extern void
+_tnl_validate_shine_tables( struct gl_context *ctx );
+
#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 22:32:42 +0000