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optimized lambda calculation (Klaus Niederkrueger)

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This commit is contained in:
Brian Paul 2001-03-03 00:37:27 +00:00
parent 85312e6db1
commit 19bbfc6263
2 changed files with 218 additions and 203 deletions
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351
src/mesa/swrast/s_triangle.c
View file

@ -1,4 +1,4 @@
/* $Id: s_triangle.c,v 1.13 2001/02/16 18:14:41 keithw Exp $ */
/* $Id: s_triangle.c,v 1.14 2001/03/03 00:37:27 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -388,10 +388,10 @@ static void affine_textured_triangle( GLcontext *ctx,
} \
if (envmode == GL_BLEND || envmode == GL_ADD) { \
/* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \
er = FloatToFixed(unit->EnvColor[0]); \
eg = FloatToFixed(unit->EnvColor[1]); \
eb = FloatToFixed(unit->EnvColor[2]); \
ea = FloatToFixed(unit->EnvColor[3]); \
er = FloatToFixed(unit->EnvColor[RCOMP]); \
eg = FloatToFixed(unit->EnvColor[GCOMP]); \
eb = FloatToFixed(unit->EnvColor[BCOMP]); \
ea = FloatToFixed(unit->EnvColor[ACOMP]); \
} \
switch (format) { \
case GL_ALPHA: \
@ -423,9 +423,9 @@ static void affine_textured_triangle( GLcontext *ctx,
*/
#define NEAREST_RGB \
tr = tex00[0]; \
tg = tex00[1]; \
tb = tex00[2]; \
tr = tex00[RCOMP]; \
tg = tex00[GCOMP]; \
tb = tex00[BCOMP]; \
ta = 0xff
#define LINEAR_RGB \
@ -438,10 +438,10 @@ static void affine_textured_triangle( GLcontext *ctx,
ta = 0xff
#define NEAREST_RGBA \
tr = tex00[0]; \
tg = tex00[1]; \
tb = tex00[2]; \
ta = tex00[3]
tr = tex00[RCOMP]; \
tg = tex00[GCOMP]; \
tb = tex00[BCOMP]; \
ta = tex00[ACOMP]
#define LINEAR_RGBA \
tr = (ti * (si * tex00[0] + sf * tex01[0]) + \
@ -454,34 +454,34 @@ static void affine_textured_triangle( GLcontext *ctx,
tf * (si * tex10[3] + sf * tex11[3])) >> 2 * FIXED_SHIFT
#define MODULATE \
dest[0] = ffr * (tr + 1) >> (FIXED_SHIFT + 8); \
dest[1] = ffg * (tg + 1) >> (FIXED_SHIFT + 8); \
dest[2] = ffb * (tb + 1) >> (FIXED_SHIFT + 8); \
dest[3] = ffa * (ta + 1) >> (FIXED_SHIFT + 8)
dest[RCOMP] = ffr * (tr + 1) >> (FIXED_SHIFT + 8); \
dest[GCOMP] = ffg * (tg + 1) >> (FIXED_SHIFT + 8); \
dest[BCOMP] = ffb * (tb + 1) >> (FIXED_SHIFT + 8); \
dest[ACOMP] = ffa * (ta + 1) >> (FIXED_SHIFT + 8)
#define DECAL \
dest[0] = ((0xff - ta) * ffr + ((ta + 1) * tr << FIXED_SHIFT)) >> (FIXED_SHIFT + 8); \
dest[1] = ((0xff - ta) * ffg + ((ta + 1) * tg << FIXED_SHIFT)) >> (FIXED_SHIFT + 8); \
dest[2] = ((0xff - ta) * ffb + ((ta + 1) * tb << FIXED_SHIFT)) >> (FIXED_SHIFT + 8); \
dest[3] = FixedToInt(ffa)
dest[RCOMP] = ((0xff - ta) * ffr + ((ta + 1) * tr << FIXED_SHIFT)) >> (FIXED_SHIFT + 8); \
dest[GCOMP] = ((0xff - ta) * ffg + ((ta + 1) * tg << FIXED_SHIFT)) >> (FIXED_SHIFT + 8); \
dest[BCOMP] = ((0xff - ta) * ffb + ((ta + 1) * tb << FIXED_SHIFT)) >> (FIXED_SHIFT + 8); \
dest[ACOMP] = FixedToInt(ffa)
#define BLEND \
dest[0] = ((0xff - tr) * ffr + (tr + 1) * er) >> (FIXED_SHIFT + 8); \
dest[1] = ((0xff - tg) * ffg + (tg + 1) * eg) >> (FIXED_SHIFT + 8); \
dest[2] = ((0xff - tb) * ffb + (tb + 1) * eb) >> (FIXED_SHIFT + 8); \
dest[3] = ffa * (ta + 1) >> (FIXED_SHIFT + 8)
dest[RCOMP] = ((0xff - tr) * ffr + (tr + 1) * er) >> (FIXED_SHIFT + 8); \
dest[GCOMP] = ((0xff - tg) * ffg + (tg + 1) * eg) >> (FIXED_SHIFT + 8); \
dest[BCOMP] = ((0xff - tb) * ffb + (tb + 1) * eb) >> (FIXED_SHIFT + 8); \
dest[ACOMP] = ffa * (ta + 1) >> (FIXED_SHIFT + 8)
#define REPLACE \
dest[0] = tr; \
dest[1] = tg; \
dest[2] = tb; \
dest[3] = ta
dest[RCOMP] = tr; \
dest[GCOMP] = tg; \
dest[BCOMP] = tb; \
dest[ACOMP] = ta
#define ADD \
dest[0] = ((ffr << 8) + (tr + 1) * er) >> (FIXED_SHIFT + 8); \
dest[1] = ((ffg << 8) + (tg + 1) * eg) >> (FIXED_SHIFT + 8); \
dest[2] = ((ffb << 8) + (tb + 1) * eb) >> (FIXED_SHIFT + 8); \
dest[3] = ffa * (ta + 1) >> (FIXED_SHIFT + 8)
dest[RCOMP] = ((ffr << 8) + (tr + 1) * er) >> (FIXED_SHIFT + 8); \
dest[GCOMP] = ((ffg << 8) + (tg + 1) * eg) >> (FIXED_SHIFT + 8); \
dest[BCOMP] = ((ffb << 8) + (tb + 1) * eb) >> (FIXED_SHIFT + 8); \
dest[ACOMP] = ffa * (ta + 1) >> (FIXED_SHIFT + 8)
/* shortcuts */
@ -713,10 +713,10 @@ static void near_persp_textured_triangle(GLcontext *ctx,
return; \
} \
if (envmode == GL_BLEND || envmode == GL_ADD) { \
er = FloatToFixed(unit->EnvColor[0]); \
eg = FloatToFixed(unit->EnvColor[1]); \
eb = FloatToFixed(unit->EnvColor[2]); \
ea = FloatToFixed(unit->EnvColor[3]); \
er = FloatToFixed(unit->EnvColor[RCOMP]); \
eg = FloatToFixed(unit->EnvColor[GCOMP]); \
eb = FloatToFixed(unit->EnvColor[BCOMP]); \
ea = FloatToFixed(unit->EnvColor[ACOMP]); \
} \
sscale = twidth; \
tscale = theight; \
@ -728,7 +728,7 @@ static void near_persp_textured_triangle(GLcontext *ctx,
GLint s = (int)(SS * invQ + BIAS) & smask; \
GLint t = (int)(TT * invQ + BIAS) & tmask; \
GLint pos = COMP * ((t << twidth_log2) + s); \
GLchan *tex00 = texture + pos; \
const GLchan *tex00 = texture + pos; \
zspan[i] = FixedToDepth(ffz); \
fogspan[i] = fffog / 256; \
DO_TEX; \
@ -1444,10 +1444,10 @@ static void lin_persp_textured_triangle( GLcontext *ctx,
return; \
} \
if (envmode == GL_BLEND || envmode == GL_ADD) { \
er = FloatToFixed(unit->EnvColor[0]); \
eg = FloatToFixed(unit->EnvColor[1]); \
eb = FloatToFixed(unit->EnvColor[2]); \
ea = FloatToFixed(unit->EnvColor[3]); \
er = FloatToFixed(unit->EnvColor[RCOMP]); \
eg = FloatToFixed(unit->EnvColor[GCOMP]); \
eb = FloatToFixed(unit->EnvColor[BCOMP]); \
ea = FloatToFixed(unit->EnvColor[ACOMP]); \
} \
switch (format) { \
case GL_ALPHA: \
@ -1603,10 +1603,10 @@ static void general_textured_triangle( GLcontext *ctx,
GLboolean flat_shade = (ctx->Light.ShadeModel==GL_FLAT); \
GLint r, g, b, a; \
if (flat_shade) { \
r = v2->color[0]; \
g = v2->color[1]; \
b = v2->color[2]; \
a = v2->color[3]; \
r = v2->color[RCOMP]; \
g = v2->color[GCOMP]; \
b = v2->color[BCOMP]; \
a = v2->color[ACOMP]; \
}
#define INNER_LOOP( LEFT, RIGHT, Y ) \
{ \
@ -1698,13 +1698,13 @@ static void general_textured_spec_triangle1( GLcontext *ctx,
GLboolean flat_shade = (ctx->Light.ShadeModel==GL_FLAT); \
GLint r, g, b, a, sr, sg, sb; \
if (flat_shade) { \
r = v2->color[0]; \
g = v2->color[1]; \
b = v2->color[2]; \
a = v2->color[3]; \
sr = v2->specular[0]; \
sg = v2->specular[1]; \
sb = v2->specular[2]; \
r = v2->color[RCOMP]; \
g = v2->color[GCOMP]; \
b = v2->color[BCOMP]; \
a = v2->color[ACOMP]; \
sr = v2->specular[RCOMP]; \
sg = v2->specular[GCOMP]; \
sb = v2->specular[BCOMP]; \
}
#define INNER_LOOP( LEFT, RIGHT, Y ) \
{ \
@ -1777,26 +1777,6 @@ static void general_textured_spec_triangle1( GLcontext *ctx,
}
/*
* Compute the lambda value for a fragment. (texture level of detail)
*/
static INLINE GLfloat
compute_lambda( GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy,
GLfloat invQ, GLfloat width, GLfloat height )
{
GLfloat dudx = dsdx * invQ * width;
GLfloat dudy = dsdy * invQ * width;
GLfloat dvdx = dtdx * invQ * height;
GLfloat dvdy = dtdy * invQ * height;
GLfloat r1 = dudx * dudx + dudy * dudy;
GLfloat r2 = dvdx * dvdx + dvdy * dvdy;
GLfloat rho2 = r1 + r2; /* used to be: rho2 = MAX2(r1,r2); */
/* return log base 2 of rho */
return log(rho2) * 1.442695 * 0.5; /* 1.442695 = 1/log(2) */
}
/*
* Render a smooth-shaded, textured, RGBA triangle.
* Interpolate S,T,U with perspective correction and compute lambda for
@ -1828,10 +1808,10 @@ static void lambda_textured_triangle1( GLcontext *ctx,
const GLboolean flat_shade = (ctx->Light.ShadeModel==GL_FLAT); \
GLint r, g, b, a; \
if (flat_shade) { \
r = v2->color[0]; \
g = v2->color[1]; \
b = v2->color[2]; \
a = v2->color[3]; \
r = v2->color[RCOMP]; \
g = v2->color[GCOMP]; \
b = v2->color[BCOMP]; \
a = v2->color[ACOMP]; \
}
#define INNER_LOOP( LEFT, RIGHT, Y ) \
@ -1855,7 +1835,7 @@ static void lambda_textured_triangle1( GLcontext *ctx,
s[i] = ss*invQ; \
t[i] = tt*invQ; \
u[i] = uu*invQ; \
lambda[i] = COMPUTE_LAMBDA(invQ); \
COMPUTE_LAMBDA(lambda[i], invQ); \
ffz += fdzdx; \
fffog += fdfogdx; \
ss += dsdx; \
@ -1876,7 +1856,7 @@ static void lambda_textured_triangle1( GLcontext *ctx,
s[i] = ss*invQ; \
t[i] = tt*invQ; \
u[i] = uu*invQ; \
lambda[i] = COMPUTE_LAMBDA(invQ); \
COMPUTE_LAMBDA(lambda[i], invQ); \
ffz += fdzdx; \
fffog += fdfogdx; \
ffr += fdrdx; \
@ -1932,13 +1912,13 @@ static void lambda_textured_spec_triangle1( GLcontext *ctx,
const GLboolean flat_shade = (ctx->Light.ShadeModel==GL_FLAT); \
GLint r, g, b, a, sr, sg, sb; \
if (flat_shade) { \
r = v2->color[0]; \
g = v2->color[1]; \
b = v2->color[2]; \
a = v2->color[3]; \
sr = v2->specular[0]; \
sg = v2->specular[1]; \
sb = v2->specular[2]; \
r = v2->color[RCOMP]; \
g = v2->color[GCOMP]; \
b = v2->color[BCOMP]; \
a = v2->color[ACOMP]; \
sr = v2->specular[RCOMP]; \
sg = v2->specular[GCOMP]; \
sb = v2->specular[BCOMP]; \
}
#define INNER_LOOP( LEFT, RIGHT, Y ) \
@ -1966,7 +1946,7 @@ static void lambda_textured_spec_triangle1( GLcontext *ctx,
s[i] = ss*invQ; \
t[i] = tt*invQ; \
u[i] = uu*invQ; \
lambda[i] = COMPUTE_LAMBDA(invQ); \
COMPUTE_LAMBDA(lambda[i], invQ); \
fffog += fdfogdx; \
ffz += fdzdx; \
ss += dsdx; \
@ -1990,7 +1970,7 @@ static void lambda_textured_spec_triangle1( GLcontext *ctx,
s[i] = ss*invQ; \
t[i] = tt*invQ; \
u[i] = uu*invQ; \
lambda[i] = COMPUTE_LAMBDA(invQ); \
COMPUTE_LAMBDA(lambda[i], invQ); \
fffog += fdfogdx; \
ffz += fdzdx; \
ffr += fdrdx; \
@ -2036,112 +2016,109 @@ lambda_multitextured_triangle1( GLcontext *ctx,
#define INTERP_RGB 1
#define INTERP_ALPHA 1
#define INTERP_MULTITEX 1
#define INTERP_MULTILAMBDA 1
#define SETUP_CODE \
GLchan rgba[MAX_WIDTH][4]; \
const GLboolean flat_shade = (ctx->Light.ShadeModel==GL_FLAT); \
GLfloat twidth[MAX_TEXTURE_UNITS], theight[MAX_TEXTURE_UNITS]; \
GLint r, g, b, a; \
if (flat_shade) { \
r = v2->color[0]; \
g = v2->color[1]; \
b = v2->color[2]; \
a = v2->color[3]; \
} \
{ \
GLuint unit; \
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) { \
if (ctx->Texture.Unit[unit]._ReallyEnabled) { \
#define SETUP_CODE \
GLchan rgba[MAX_WIDTH][4]; \
const GLboolean flat_shade = (ctx->Light.ShadeModel==GL_FLAT); \
GLfloat twidth[MAX_TEXTURE_UNITS], theight[MAX_TEXTURE_UNITS]; \
GLint r, g, b, a; \
if (flat_shade) { \
r = v2->color[0]; \
g = v2->color[1]; \
b = v2->color[2]; \
a = v2->color[3]; \
} \
{ \
GLuint unit; \
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) { \
if (ctx->Texture.Unit[unit]._ReallyEnabled) { \
const struct gl_texture_object *obj = ctx->Texture.Unit[unit]._Current; \
const GLint baseLevel = obj->BaseLevel; \
const struct gl_texture_image *texImage = obj->Image[baseLevel]; \
twidth[unit] = (GLfloat) texImage->Width; \
theight[unit] = (GLfloat) texImage->Height; \
} \
} \
const GLint baseLevel = obj->BaseLevel; \
const struct gl_texture_image *texImage = obj->Image[baseLevel];\
twidth[unit] = (GLfloat) texImage->Width; \
theight[unit] = (GLfloat) texImage->Height; \
} \
} \
}
#define INNER_LOOP( LEFT, RIGHT, Y ) \
{ \
GLint i; \
const GLint n = RIGHT-LEFT; \
GLdepth zspan[MAX_WIDTH]; \
GLfixed fogspan[MAX_WIDTH]; \
GLfloat lambda[MAX_TEXTURE_UNITS][MAX_WIDTH]; \
if (n > 0) { \
if (flat_shade) { \
for (i=0;i<n;i++) { \
zspan[i] = FixedToDepth(ffz); \
fogspan[i] = fffog / 256; \
fffog += fdfogdx; \
ffz += fdzdx; \
rgba[i][RCOMP] = r; \
rgba[i][GCOMP] = g; \
rgba[i][BCOMP] = b; \
rgba[i][ACOMP] = a; \
{ \
GLuint unit; \
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) { \
if (ctx->Texture.Unit[unit]._ReallyEnabled) { \
GLdouble invQ = 1.0 / vv[unit]; \
s[unit][i] = ss[unit] * invQ; \
t[unit][i] = tt[unit] * invQ; \
u[unit][i] = uu[unit] * invQ; \
lambda[unit][i] = compute_lambda(dsdx[unit], dsdy[unit],\
dtdx[unit], dtdy[unit], invQ, \
twidth[unit], theight[unit] ); \
ss[unit] += dsdx[unit]; \
tt[unit] += dtdx[unit]; \
uu[unit] += dudx[unit]; \
vv[unit] += dvdx[unit]; \
} \
} \
} \
} \
} \
else { /* smooth shade */ \
for (i=0;i<n;i++) { \
zspan[i] = FixedToDepth(ffz); \
fogspan[i] = fffog / 256; \
ffz += fdzdx; \
fffog += fdfogdx; \
rgba[i][RCOMP] = FixedToInt(ffr); \
rgba[i][GCOMP] = FixedToInt(ffg); \
rgba[i][BCOMP] = FixedToInt(ffb); \
rgba[i][ACOMP] = FixedToInt(ffa); \
ffr += fdrdx; \
ffg += fdgdx; \
ffb += fdbdx; \
ffa += fdadx; \
{ \
GLuint unit; \
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) { \
if (ctx->Texture.Unit[unit]._ReallyEnabled) { \
GLdouble invQ = 1.0 / vv[unit]; \
s[unit][i] = ss[unit] * invQ; \
t[unit][i] = tt[unit] * invQ; \
u[unit][i] = uu[unit] * invQ; \
lambda[unit][i] = compute_lambda(dsdx[unit], dsdy[unit],\
dtdx[unit], dtdy[unit], invQ, \
twidth[unit], theight[unit] ); \
ss[unit] += dsdx[unit]; \
tt[unit] += dtdx[unit]; \
uu[unit] += dudx[unit]; \
vv[unit] += dvdx[unit]; \
} \
} \
} \
} \
} \
gl_write_multitexture_span( ctx, n, LEFT, Y, zspan, fogspan, \
(const GLfloat (*)[MAX_WIDTH]) s, \
(const GLfloat (*)[MAX_WIDTH]) t, \
(const GLfloat (*)[MAX_WIDTH]) u, \
(GLfloat (*)[MAX_WIDTH]) lambda, \
rgba, NULL, GL_POLYGON ); \
} \
#define INNER_LOOP( LEFT, RIGHT, Y ) \
{ \
GLint i; \
const GLint n = RIGHT-LEFT; \
GLdepth zspan[MAX_WIDTH]; \
GLfixed fogspan[MAX_WIDTH]; \
GLfloat lambda[MAX_TEXTURE_UNITS][MAX_WIDTH]; \
if (n > 0) { \
if (flat_shade) { \
for (i=0;i<n;i++) { \
zspan[i] = FixedToDepth(ffz); \
fogspan[i] = fffog / 256; \
fffog += fdfogdx; \
ffz += fdzdx; \
rgba[i][RCOMP] = r; \
rgba[i][GCOMP] = g; \
rgba[i][BCOMP] = b; \
rgba[i][ACOMP] = a; \
{ \
GLuint unit; \
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {\
if (ctx->Texture.Unit[unit]._ReallyEnabled) { \
GLdouble invQ = 1.0 / vv[unit]; \
s[unit][i] = ss[unit] * invQ; \
t[unit][i] = tt[unit] * invQ; \
u[unit][i] = uu[unit] * invQ; \
COMPUTE_MULTILAMBDA(lambda[unit][i], invQ, unit);\
ss[unit] += dsdx[unit]; \
tt[unit] += dtdx[unit]; \
uu[unit] += dudx[unit]; \
vv[unit] += dvdx[unit]; \
} \
} \
} \
} \
} \
else { /* smooth shade */ \
for (i=0;i<n;i++) { \
zspan[i] = FixedToDepth(ffz); \
fogspan[i] = fffog / 256; \
ffz += fdzdx; \
fffog += fdfogdx; \
rgba[i][RCOMP] = FixedToInt(ffr); \
rgba[i][GCOMP] = FixedToInt(ffg); \
rgba[i][BCOMP] = FixedToInt(ffb); \
rgba[i][ACOMP] = FixedToInt(ffa); \
ffr += fdrdx; \
ffg += fdgdx; \
ffb += fdbdx; \
ffa += fdadx; \
{ \
GLuint unit; \
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {\
if (ctx->Texture.Unit[unit]._ReallyEnabled) { \
GLdouble invQ = 1.0 / vv[unit]; \
s[unit][i] = ss[unit] * invQ; \
t[unit][i] = tt[unit] * invQ; \
u[unit][i] = uu[unit] * invQ; \
COMPUTE_MULTILAMBDA(lambda[unit][i], invQ, unit); \
ss[unit] += dsdx[unit]; \
tt[unit] += dtdx[unit]; \
uu[unit] += dudx[unit]; \
vv[unit] += dvdx[unit]; \
} \
} \
} \
} \
} \
gl_write_multitexture_span( ctx, n, LEFT, Y, zspan, fogspan, \
(const GLfloat (*)[MAX_WIDTH]) s, \
(const GLfloat (*)[MAX_WIDTH]) t, \
(const GLfloat (*)[MAX_WIDTH]) u, \
(GLfloat (*)[MAX_WIDTH]) lambda, \
rgba, NULL, GL_POLYGON ); \
} \
}
#include "s_tritemp.h"
}

70
src/mesa/swrast/s_tritemp.h
View file

@ -1,4 +1,4 @@
/* $Id: s_tritemp.h,v 1.10 2001/02/12 17:02:00 brianp Exp $ */
/* $Id: s_tritemp.h,v 1.11 2001/03/03 00:37:27 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -39,11 +39,13 @@
* INTERP_INDEX - if defined, interpolate color index values
* INTERP_INT_TEX - if defined, interpolate integer ST texcoords
* (fast, simple 2-D texture mapping)
* INTERP_LAMBDA - if defined, the lambda value is computed at every
* pixel, to apply MIPMAPPING, and min/maxification
* INTERP_TEX - if defined, interpolate set 0 float STRQ texcoords
* NOTE: OpenGL STRQ = Mesa STUV (R was taken for red)
* INTERP_MULTITEX - if defined, interpolate N units of STRQ texcoords
* INTERP_LAMBDA - if defined, the lambda value is computed at every
* pixel, to apply MIPMAPPING, and min/maxification
* INTERP_MULTILAMBDA - like above but for multitexturing, i.e.
* a lambda value for every texture unit
*
* When one can directly address pixels in the color buffer the following
* macros can be defined and used to compute pixel addresses during
@ -285,14 +287,21 @@
GLfloat dudx[MAX_TEXTURE_UNITS], dudy[MAX_TEXTURE_UNITS];
GLfloat dvdx[MAX_TEXTURE_UNITS], dvdy[MAX_TEXTURE_UNITS];
#endif
#ifdef INTERP_LAMBDA
#ifdef INTERP_LAMBDA
#ifndef INTERP_TEX
#error "Mipmapping without texturing doesn't make sense."
#endif
GLfloat lambda_nominator;
#endif /* INTERP_LAMBDA */
#ifdef INTERP_MULTILAMBDA
#ifndef INTERP_MULTITEX
#error "Multi-Mipmapping without multi-texturing doesn't make sense."
#endif
GLfloat lambda_nominator[MAX_TEXTURE_UNITS];
#endif /* INTERP_MULTILAMBDA */
/*
* Execute user-supplied setup code
@ -974,20 +983,47 @@
* which saves some computation time.
*/
{
GLfloat dudx = dsdx /* * invQ*/ * twidth;
GLfloat dudy = dsdy /* * invQ*/ * twidth;
GLfloat dvdx = dtdx /* * invQ*/ * theight;
GLfloat dvdy = dtdy /* * invQ*/ * theight;
GLfloat r1 = dudx * dudx + dudy * dudy;
GLfloat r2 = dvdx * dvdx + dvdy * dvdy;
GLfloat rho2 = r1 + r2; /* used to be: rho2 = MAX2(r1,r2); */
lambda_nominator = rho2;
GLfloat dudx = dsdx /* * invQ*/ * twidth;
GLfloat dudy = dsdy /* * invQ*/ * twidth;
GLfloat dvdx = dtdx /* * invQ*/ * theight;
GLfloat dvdy = dtdy /* * invQ*/ * theight;
GLfloat r1 = dudx * dudx + dudy * dudy;
GLfloat r2 = dvdx * dvdx + dvdy * dvdy;
GLfloat rho2 = r1 + r2; /* was: rho2 = MAX2(r1,r2); */
lambda_nominator = rho2;
}
/* return log base 2 of sqrt(rho) */
#define COMPUTE_LAMBDA(X) log( lambda_nominator * (X)*(X) ) * 1.442695F * 0.5F /* 1.442695 = 1/log(2) */
/* set DEST to log_(base 2) of sqrt(rho) */
/* 1.442695 = 1/log(2) */
#define COMPUTE_LAMBDA(DEST, X) \
DEST = log( lambda_nominator * (X)*(X) ) * 1.442695F * 0.5F
#endif
#ifdef INTERP_MULTILAMBDA
/*
* Read the comment for INTERP_LAMBDA, but apply to each texture unit
*/
{
GLuint unit;
for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
if (ctx->Texture.Unit[unit]._ReallyEnabled) {
GLfloat dudx = dsdx[unit] /* * invQ*/ * twidth[unit];
GLfloat dudy = dsdy[unit] /* * invQ*/ * twidth[unit];
GLfloat dvdx = dtdx[unit] /* * invQ*/ * theight[unit];
GLfloat dvdy = dtdy[unit] /* * invQ*/ * theight[unit];
GLfloat r1 = dudx * dudx + dudy * dudy;
GLfloat r2 = dvdx * dvdx + dvdy * dvdy;
GLfloat rho2 = r1 + r2; /* used to be: rho2 = MAX2(r1,r2); */
lambda_nominator[unit] = rho2;
}
}
}
/* set DEST to log_(base 2) of sqrt(rho) */
#define COMPUTE_MULTILAMBDA(DEST, X, unit) \
DEST = log( lambda_nominator[unit] * (X)*(X) ) * 1.442695F * 0.5F
#endif
INNER_LOOP( left, right, iy );
/*
@ -1117,11 +1153,13 @@
#undef INTERP_SPEC
#undef INTERP_ALPHA
#undef INTERP_INDEX
#undef INTERP_LAMBDA
#undef COMPUTE_LAMBDA
#undef INTERP_INT_TEX
#undef INTERP_TEX
#undef INTERP_MULTITEX
#undef INTERP_LAMBDA
#undef COMPUTE_LAMBDA
#undef INTERP_MULTILAMBDA
#undef COMPUTE_MULTILAMBDA
#undef S_SCALE
#undef T_SCALE