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-rw-r--r--src/mesa/swrast/s_fog.c226
-rw-r--r--src/mesa/swrast/s_fog.h33
-rw-r--r--src/mesa/swrast/s_span.c49
-rw-r--r--src/mesa/swrast/s_span.h5
4 files changed, 98 insertions, 215 deletions
diff --git a/src/mesa/swrast/s_fog.c b/src/mesa/swrast/s_fog.c
index caaefcb688f..0988ebb1a7d 100644
--- a/src/mesa/swrast/s_fog.c
+++ b/src/mesa/swrast/s_fog.c
@@ -1,4 +1,4 @@
-/* $Id: s_fog.c,v 1.21 2002/02/02 21:40:33 brianp Exp $ */
+/* $Id: s_fog.c,v 1.22 2002/02/17 17:30:58 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -33,6 +33,7 @@
#include "s_context.h"
#include "s_fog.h"
+#include "s_span.h"
@@ -62,7 +63,7 @@ _mesa_z_to_fogfactor(GLcontext *ctx, GLfloat z)
f = (GLfloat) exp(-(d * d * z * z));
return f;
default:
- _mesa_problem(ctx, "Bad fog mode in make_fog_coord");
+ _mesa_problem(ctx, "Bad fog mode in _mesa_z_to_fogfactor");
return 0.0;
}
}
@@ -70,127 +71,6 @@ _mesa_z_to_fogfactor(GLcontext *ctx, GLfloat z)
/**
- * Apply fog to a span of RGBA pixels.
- * Input: ctx -
- * span - where span->fog and span->fogStep have to be set.
- * red, green, blue, alpha - pixel colors
- * Output: red, green, blue, alpha - fogged pixel colors
- */
-void
-_mesa_fog_rgba_pixels( const GLcontext *ctx, struct sw_span *span,
- GLchan rgba[][4] )
-{
- GLuint i;
- GLfloat fog = span->fog, Dfog = span->fogStep;
- GLchan rFog, gFog, bFog;
-
- ASSERT(ctx->Fog.Enabled);
- ASSERT(span->interpMask & SPAN_FOG);
- ASSERT(span->arrayMask & SPAN_RGBA);
-
- UNCLAMPED_FLOAT_TO_CHAN(rFog, ctx->Fog.Color[RCOMP]);
- UNCLAMPED_FLOAT_TO_CHAN(gFog, ctx->Fog.Color[GCOMP]);
- UNCLAMPED_FLOAT_TO_CHAN(bFog, ctx->Fog.Color[BCOMP]);
-
- for (i = 0; i < span->end; i++) {
- const GLfloat one_min_fog = 1.0F - fog;
- rgba[i][RCOMP] = (GLchan) (fog * rgba[i][RCOMP] + one_min_fog * rFog);
- rgba[i][GCOMP] = (GLchan) (fog * rgba[i][GCOMP] + one_min_fog * gFog);
- rgba[i][BCOMP] = (GLchan) (fog * rgba[i][BCOMP] + one_min_fog * bFog);
- fog += Dfog;
- }
-}
-
-
-/**
- * Apply fog given in an array to RGBA pixels.
- * Input: ctx -
- * span -
- * fog - array of fog factors in [0,1]
- * red, green, blue, alpha - pixel colors
- * Output: red, green, blue, alpha - fogged pixel colors
- */
-void
-_mesa_fog_rgba_pixels_with_array( const GLcontext *ctx, struct sw_span *span,
- const GLfloat fog[], GLchan rgba[][4] )
-{
- GLuint i;
- GLchan rFog, gFog, bFog;
-
- ASSERT(fog != NULL);
- ASSERT(ctx->Fog.Enabled);
- ASSERT(span->arrayMask & SPAN_RGBA);
-
- UNCLAMPED_FLOAT_TO_CHAN(rFog, ctx->Fog.Color[RCOMP]);
- UNCLAMPED_FLOAT_TO_CHAN(gFog, ctx->Fog.Color[GCOMP]);
- UNCLAMPED_FLOAT_TO_CHAN(bFog, ctx->Fog.Color[BCOMP]);
-
- for (i = span->start; i < span->end; i++) {
- const GLfloat f = fog[i];
- const GLfloat g = 1.0F - f;
- rgba[i][RCOMP] = (GLchan) (f * rgba[i][RCOMP] + g * rFog);
- rgba[i][GCOMP] = (GLchan) (f * rgba[i][GCOMP] + g * gFog);
- rgba[i][BCOMP] = (GLchan) (f * rgba[i][BCOMP] + g * bFog);
- }
-}
-
-
-
-/**
- * Apply fog to a span of color index pixels.
- * Input: ctx -
- * span - where span->fog and span->fogStep have to be set.
- * index - pixel color indexes
- * Output: index - fogged pixel color indexes
- */
-void
-_mesa_fog_ci_pixels( const GLcontext *ctx, struct sw_span *span,
- GLuint index[] )
-{
- GLuint idx = (GLuint) ctx->Fog.Index;
- GLuint i;
- GLfloat fog = span->fog, Dfog = span->fogStep;
-
- ASSERT(ctx->Fog.Enabled);
- ASSERT(span->interpMask & SPAN_FOG);
- ASSERT(span->arrayMask & SPAN_INDEX);
-
- for (i = 0; i < span->end; i++) {
- const GLfloat f = CLAMP(fog, 0.0F, 1.0F);
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * idx);
- fog += Dfog;
- }
-}
-
-
-/**
- * Apply fog given in an array to a span of color index pixels.
- * Input: ctx -
- * span -
- * fog - array of fog factors in [0,1]
- * index - pixel color indexes
- * Output: index - fogged pixel color indexes
- */
-void
-_mesa_fog_ci_pixels_with_array( const GLcontext *ctx, struct sw_span *span,
- const GLfloat fog[], GLuint index[] )
-{
- GLuint idx = (GLuint) ctx->Fog.Index;
- GLuint i;
-
- ASSERT(fog != NULL);
- ASSERT(ctx->Fog.Enabled);
- ASSERT(span->arrayMask & SPAN_INDEX);
-
- for (i = span->start; i < span->end; i++) {
- const GLfloat f = CLAMP(fog[i], 0.0F, 1.0F);
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * idx);
- }
-}
-
-
-
-/**
* Calculate fog factors (in [0,1]) from window z values
* Input: n - number of pixels
* z - array of integer depth values
@@ -331,45 +211,99 @@ compute_fog_factors_from_z( const GLcontext *ctx,
}
+
/**
* Apply fog to a span of RGBA pixels.
- * Input: ctx -
- * span - where span->zArray has to be filled.
- * red, green, blue, alpha - pixel colors
- * Output: red, green, blue, alpha - fogged pixel colors
+ * The fog factors are either in the span->fogArray or stored as base/step.
+ * These are fog _factors_, not fog coords. Fog coords were converted to
+ * fog factors per vertex.
*/
void
-_mesa_depth_fog_rgba_pixels(const GLcontext *ctx, struct sw_span *span,
- GLchan rgba[][4])
+_mesa_fog_rgba_span( const GLcontext *ctx, struct sw_span *span )
{
- GLfloat fogFact[MAX_WIDTH];
+ const SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ const GLuint n = span->end;
+ GLchan (*rgba)[4] = (GLchan (*)[4]) span->color.rgba;
+ GLchan rFog, gFog, bFog;
ASSERT(ctx->Fog.Enabled);
- ASSERT(span->arrayMask & SPAN_Z);
- ASSERT(span->end <= MAX_WIDTH);
+ ASSERT((span->interpMask | span->arrayMask) & SPAN_FOG);
+ ASSERT(span->arrayMask & SPAN_RGBA);
- compute_fog_factors_from_z(ctx, span->end, span->zArray, fogFact );
- _mesa_fog_rgba_pixels_with_array( ctx, span, fogFact, rgba );
+ UNCLAMPED_FLOAT_TO_CHAN(rFog, ctx->Fog.Color[RCOMP]);
+ UNCLAMPED_FLOAT_TO_CHAN(gFog, ctx->Fog.Color[GCOMP]);
+ UNCLAMPED_FLOAT_TO_CHAN(bFog, ctx->Fog.Color[BCOMP]);
+
+ if (swrast->_PreferPixelFog) {
+ /* compute fog factor from each fragment's Z value */
+ if ((span->interpMask & SPAN_Z) && (span->arrayMask & SPAN_Z) == 0)
+ _mesa_span_interpolate_z(ctx, span);
+ compute_fog_factors_from_z(ctx, n, span->zArray, span->fogArray);
+ span->arrayMask |= SPAN_FOG;
+ }
+
+ if (span->arrayMask & SPAN_FOG) {
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ const GLfloat fog = span->fogArray[i];
+ const GLfloat oneMinusFog = 1.0F - fog;
+ rgba[i][RCOMP] = (GLchan) (fog * rgba[i][RCOMP] + oneMinusFog * rFog);
+ rgba[i][GCOMP] = (GLchan) (fog * rgba[i][GCOMP] + oneMinusFog * gFog);
+ rgba[i][BCOMP] = (GLchan) (fog * rgba[i][BCOMP] + oneMinusFog * bFog);
+ }
+ }
+ else {
+ GLfloat fog = span->fog, dFog = span->fogStep;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ const GLfloat oneMinusFog = 1.0F - fog;
+ rgba[i][RCOMP] = (GLchan) (fog * rgba[i][RCOMP] + oneMinusFog * rFog);
+ rgba[i][GCOMP] = (GLchan) (fog * rgba[i][GCOMP] + oneMinusFog * gFog);
+ rgba[i][BCOMP] = (GLchan) (fog * rgba[i][BCOMP] + oneMinusFog * bFog);
+ fog += dFog;
+ }
+ }
}
/**
- * Apply fog to a span of color index pixels.
- * Input: ctx -
- * span - where span->zArray has to be filled.
- * index - pixel color indexes
- * Output: index - fogged pixel color indexes
+ * As above, but color index mode.
*/
void
-_mesa_depth_fog_ci_pixels( const GLcontext *ctx, struct sw_span *span,
- GLuint index[] )
+_mesa_fog_ci_span( const GLcontext *ctx, struct sw_span *span )
{
- GLfloat fogFact[MAX_WIDTH];
+ const SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ const GLuint n = span->end;
+ GLuint *index = span->color.index;
ASSERT(ctx->Fog.Enabled);
- ASSERT(span->arrayMask & SPAN_Z);
- ASSERT(span->end <= MAX_WIDTH);
+ ASSERT(span->arrayMask & SPAN_INDEX);
+ ASSERT((span->interpMask | span->arrayMask) & SPAN_FOG);
+
+ if (swrast->_PreferPixelFog) {
+ /* compute fog factor from each fragment's Z value */
+ if ((span->interpMask & SPAN_Z) && (span->arrayMask & SPAN_Z) == 0)
+ _mesa_span_interpolate_z(ctx, span);
+ compute_fog_factors_from_z(ctx, n, span->zArray, span->fogArray);
+ span->arrayMask |= SPAN_FOG;
+ }
- compute_fog_factors_from_z(ctx, span->end, span->zArray, fogFact );
- _mesa_fog_ci_pixels_with_array( ctx, span, fogFact, index );
+ if (span->arrayMask & SPAN_FOG) {
+ const GLuint idx = (GLuint) ctx->Fog.Index;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ const GLfloat f = CLAMP(span->fogArray[i], 0.0F, 1.0F);
+ index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * idx);
+ }
+ }
+ else {
+ GLfloat fog = span->fog, dFog = span->fogStep;
+ const GLuint idx = (GLuint) ctx->Fog.Index;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ const GLfloat f = CLAMP(fog, 0.0F, 1.0F);
+ index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * idx);
+ fog += dFog;
+ }
+ }
}
diff --git a/src/mesa/swrast/s_fog.h b/src/mesa/swrast/s_fog.h
index e254f8dd51d..c7b234aee6e 100644
--- a/src/mesa/swrast/s_fog.h
+++ b/src/mesa/swrast/s_fog.h
@@ -1,10 +1,10 @@
-/* $Id: s_fog.h,v 1.8 2002/02/02 21:40:33 brianp Exp $ */
+/* $Id: s_fog.h,v 1.9 2002/02/17 17:30:58 brianp Exp $ */
/*
* Mesa 3-D graphics library
- * Version: 3.5
+ * Version: 4.1
*
- * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2002 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"),
@@ -36,34 +36,11 @@
extern GLfloat
_mesa_z_to_fogfactor(GLcontext *ctx, GLfloat z);
-
-extern void
-_mesa_fog_rgba_pixels( const GLcontext *ctx, struct sw_span *span,
- GLchan rgba[][4]);
extern void
-_mesa_fog_rgba_pixels_with_array( const GLcontext *ctx, struct sw_span *span,
- const GLfloat fog[], GLchan rgba[][4] );
-
+_mesa_fog_rgba_span( const GLcontext *ctx, struct sw_span *span );
extern void
-_mesa_fog_ci_pixels( const GLcontext *ctx, struct sw_span *span,
- GLuint indx[]);
-extern void
-_mesa_fog_ci_pixels_with_array( const GLcontext *ctx, struct sw_span *span,
- const GLfloat fog[], GLuint index[] );
+_mesa_fog_ci_span( const GLcontext *ctx, struct sw_span *span );
-extern void
-_mesa_win_fog_coords_from_z( const GLcontext *ctx,
- GLuint n,
- const GLdepth z[],
- GLfloat fogcoord[] );
-
-extern void
-_mesa_depth_fog_rgba_pixels( const GLcontext *ctx, struct sw_span *span,
- GLchan rgba[][4] );
-
-extern void
-_mesa_depth_fog_ci_pixels( const GLcontext *ctx, struct sw_span *span,
- GLuint index[] );
#endif
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index 4ed37c66040..90de11b86a3 100644
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -1,4 +1,4 @@
-/* $Id: s_span.c,v 1.35 2002/02/17 01:49:31 brianp Exp $ */
+/* $Id: s_span.c,v 1.36 2002/02/17 17:30:57 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -235,8 +235,8 @@ interpolate_specular(GLcontext *ctx, struct sw_span *span)
/* Fill in the span.zArray array from the interpolation values */
-static void
-interpolate_z(GLcontext *ctx, struct sw_span *span)
+void
+_mesa_span_interpolate_z( const GLcontext *ctx, struct sw_span *span )
{
const GLuint n = span->end;
GLuint i;
@@ -784,7 +784,7 @@ _mesa_write_index_span( GLcontext *ctx, struct sw_span *span,
/* Depth test and stencil */
if (ctx->Depth.Test || ctx->Stencil.Enabled) {
if (span->interpMask & SPAN_Z)
- interpolate_z(ctx, span);
+ _mesa_span_interpolate_z(ctx, span);
if (ctx->Stencil.Enabled) {
if (!_mesa_stencil_and_ztest_span(ctx, span)) {
@@ -819,15 +819,8 @@ _mesa_write_index_span( GLcontext *ctx, struct sw_span *span,
}
/* Fog */
- /* XXX try to simplify the fog code! */
if (ctx->Fog.Enabled) {
- if ((span->arrayMask & SPAN_FOG) && !swrast->_PreferPixelFog)
- _mesa_fog_ci_pixels_with_array( ctx, span, span->fogArray,
- span->color.index);
- else if ((span->interpMask & SPAN_FOG) && !swrast->_PreferPixelFog)
- _mesa_fog_ci_pixels( ctx, span, span->color.index);
- else
- _mesa_depth_fog_ci_pixels( ctx, span, span->color.index);
+ _mesa_fog_ci_span(ctx, span);
}
/* Antialias coverage application */
@@ -972,7 +965,7 @@ _mesa_write_rgba_span( GLcontext *ctx, struct sw_span *span,
/* Stencil and Z testing */
if (ctx->Stencil.Enabled || ctx->Depth.Test) {
if (span->interpMask & SPAN_Z)
- interpolate_z(ctx, span);
+ _mesa_span_interpolate_z(ctx, span);
if (ctx->Stencil.Enabled) {
if (!_mesa_stencil_and_ztest_span(ctx, span)) {
@@ -1011,20 +1004,8 @@ _mesa_write_rgba_span( GLcontext *ctx, struct sw_span *span,
}
/* Fog */
- /* XXX try to simplify the fog code! */
if (ctx->Fog.Enabled) {
- if ((span->arrayMask & SPAN_FOG) && !swrast->_PreferPixelFog) {
- _mesa_fog_rgba_pixels_with_array(ctx, span, span->fogArray,
- span->color.rgba);
- }
- else if ((span->interpMask & SPAN_FOG) && !swrast->_PreferPixelFog) {
- _mesa_fog_rgba_pixels(ctx, span, span->color.rgba);
- }
- else {
- if ((span->interpMask & SPAN_Z) && (span->arrayMask & SPAN_Z) == 0)
- interpolate_z(ctx, span);
- _mesa_depth_fog_rgba_pixels(ctx, span, span->color.rgba);
- }
+ _mesa_fog_rgba_span(ctx, span);
monoColor = GL_FALSE;
}
@@ -1213,7 +1194,7 @@ _mesa_write_texture_span( GLcontext *ctx, struct sw_span *span,
/* Stencil and Z testing */
if (ctx->Stencil.Enabled || ctx->Depth.Test) {
if (span->interpMask & SPAN_Z)
- interpolate_z(ctx, span);
+ _mesa_span_interpolate_z(ctx, span);
if (ctx->Stencil.Enabled) {
if (!_mesa_stencil_and_ztest_span(ctx, span)) {
@@ -1267,20 +1248,8 @@ _mesa_write_texture_span( GLcontext *ctx, struct sw_span *span,
}
/* Fog */
- /* XXX try to simplify the fog code! */
if (ctx->Fog.Enabled) {
- if ((span->arrayMask & SPAN_FOG) && !swrast->_PreferPixelFog) {
- _mesa_fog_rgba_pixels_with_array( ctx, span, span->fogArray,
- span->color.rgba);
- }
- else if ((span->interpMask & SPAN_FOG) && !swrast->_PreferPixelFog) {
- _mesa_fog_rgba_pixels( ctx, span, span->color.rgba );
- }
- else {
- if ((span->interpMask & SPAN_Z) && (span->arrayMask & SPAN_Z) == 0)
- interpolate_z(ctx, span);
- _mesa_depth_fog_rgba_pixels(ctx, span, span->color.rgba);
- }
+ _mesa_fog_rgba_span(ctx, span);
}
/* Antialias coverage application */
diff --git a/src/mesa/swrast/s_span.h b/src/mesa/swrast/s_span.h
index 0f09c031483..d9a05987267 100644
--- a/src/mesa/swrast/s_span.h
+++ b/src/mesa/swrast/s_span.h
@@ -1,4 +1,4 @@
-/* $Id: s_span.h,v 1.14 2002/01/28 03:42:28 brianp Exp $ */
+/* $Id: s_span.h,v 1.15 2002/02/17 17:30:58 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -37,6 +37,9 @@ extern void
_mesa_span_default_z( GLcontext *ctx, struct sw_span *span );
extern void
+_mesa_span_interpolate_z( const GLcontext *ctx, struct sw_span *span );
+
+extern void
_mesa_span_default_fog( GLcontext *ctx, struct sw_span *span );
extern void
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-11 14:45:08 +0000