-/* $Id: fog.c,v 1.21 2000/10/27 16:44:40 keithw Exp $ */
+/* $Id: fog.c,v 1.36 2002/10/24 23:57:20 brianp Exp $ */
/*
* Mesa 3-D graphics library
- * Version: 3.3
- *
- * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
- *
+ * Version: 3.5
+ *
+ * Copyright (C) 1999-2001 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
*/
-#ifdef PC_HEADER
-#include "all.h"
-#else
#include "glheader.h"
+#include "colormac.h"
#include "context.h"
#include "fog.h"
-#include "macros.h"
-#include "mmath.h"
-#include "types.h"
-#include "xform.h"
-#endif
+#include "mtypes.h"
}
-void
+void
_mesa_Fogfv( GLenum pname, const GLfloat *params )
{
GET_CURRENT_CONTEXT(ctx);
GLenum m;
-
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glFog");
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
switch (pname) {
case GL_FOG_MODE:
m = (GLenum) (GLint) *params;
- if (m==GL_LINEAR || m==GL_EXP || m==GL_EXP2) {
- ctx->Fog.Mode = m;
- }
- else {
- gl_error( ctx, GL_INVALID_ENUM, "glFog" );
+ switch (m) {
+ case GL_LINEAR:
+ case GL_EXP:
+ case GL_EXP2:
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
return;
}
+ if (ctx->Fog.Mode == m)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.Mode = m;
break;
case GL_FOG_DENSITY:
if (*params<0.0) {
- gl_error( ctx, GL_INVALID_VALUE, "glFog" );
+ _mesa_error( ctx, GL_INVALID_VALUE, "glFog" );
return;
}
- else {
- ctx->Fog.Density = *params;
- }
+ if (ctx->Fog.Density == *params)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.Density = *params;
break;
case GL_FOG_START:
+ if (ctx->Fog.Start == *params)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.Start = *params;
break;
case GL_FOG_END:
+ if (ctx->Fog.End == *params)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.End = *params;
break;
case GL_FOG_INDEX:
- ctx->Fog.Index = *params;
+ if (ctx->Fog.Index == *params)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.Index = *params;
break;
case GL_FOG_COLOR:
+ if (TEST_EQ_4V(ctx->Fog.Color, params))
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
ctx->Fog.Color[0] = params[0];
ctx->Fog.Color[1] = params[1];
ctx->Fog.Color[2] = params[2];
ctx->Fog.Color[3] = params[3];
break;
case GL_FOG_COORDINATE_SOURCE_EXT: {
- GLenum p = (GLenum)(GLint) *params;
- if (p == GL_FOG_COORDINATE_EXT || p == GL_FRAGMENT_DEPTH_EXT)
- ctx->Fog.FogCoordinateSource = p;
- else
- gl_error( ctx, GL_INVALID_ENUM, "glFog" );
+ GLenum p = (GLenum) (GLint) *params;
+ if (!ctx->Extensions.EXT_fog_coord ||
+ (p != GL_FOG_COORDINATE_EXT && p != GL_FRAGMENT_DEPTH_EXT)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glFog");
+ return;
+ }
+ if (ctx->Fog.FogCoordinateSource == p)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.FogCoordinateSource = p;
break;
}
default:
- gl_error( ctx, GL_INVALID_ENUM, "glFog" );
+ _mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
return;
}
if (ctx->Driver.Fogfv) {
(*ctx->Driver.Fogfv)( ctx, pname, params );
}
-
- ctx->NewState |= NEW_FOG;
}
-
-
-
-
-void
-_mesa_init_fog( void )
-{
-}
-
-static GLvector1f *get_fogcoord_ptr( GLcontext *ctx, GLvector1f *tmp )
-{
- struct vertex_buffer *VB = ctx->VB;
-
- if (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT) {
- if (!ctx->NeedEyeCoords) {
- GLfloat *m = ctx->ModelView.m;
- GLfloat plane[4];
-
- plane[0] = m[2];
- plane[1] = m[6];
- plane[2] = m[10];
- plane[3] = m[14];
-
- /* Full eye coords weren't required, just calculate the
- * eye Z values.
- */
- gl_dotprod_tab[0][VB->ObjPtr->size](&VB->Eye, 2,
- VB->ObjPtr, plane, 0 );
-
- tmp->data = &(VB->Eye.data[0][2]);
- tmp->start = VB->Eye.start+2;
- tmp->stride = VB->Eye.stride;
- return tmp;
- }
- else
- {
- if (VB->EyePtr->size < 2)
- gl_vector4f_clean_elem( &VB->Eye, VB->Count, 2 );
-
- tmp->data = &(VB->EyePtr->data[0][2]);
- tmp->start = VB->EyePtr->start+2;
- tmp->stride = VB->EyePtr->stride;
- return tmp;
- }
- } else
- return VB->FogCoordPtr;
-}
-
-
-/* Use lookup table & interpolation?
- */
-static void
-make_win_fog_coords( struct vertex_buffer *VB,
- GLvector1f *fogcoord)
-{
- const GLcontext *ctx = VB->ctx;
- GLfloat end = ctx->Fog.End;
- GLfloat *v = fogcoord->start;
- GLuint stride = fogcoord->stride;
- GLuint n = VB->Count - VB->Start;
- GLfloat *out;
- GLfloat d;
- GLuint i;
-
- VB->FogCoordPtr = VB->store.FogCoord;
- out = VB->FogCoordPtr->data + VB->Start;
-
- switch (ctx->Fog.Mode) {
- case GL_LINEAR:
- d = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
- for ( i = 0 ; i < n ; i++, STRIDE_F(v, stride)) {
- out[i] = (end - ABSF(*v)) * d;
- if (0) fprintf(stderr, "z %f out %f\n", *v, out[i]);
- }
- break;
- case GL_EXP:
- d = -ctx->Fog.Density;
- for ( i = 0 ; i < n ; i++, STRIDE_F(v,stride)) {
- out[i] = exp( d*ABSF(*v) );
- if (0) fprintf(stderr, "z %f out %f\n", *v, out[i]);
- }
- break;
- case GL_EXP2:
- d = -(ctx->Fog.Density*ctx->Fog.Density);
- for ( i = 0 ; i < n ; i++, STRIDE_F(v, stride)) {
- GLfloat z = *v;
- out[i] = exp( d*z*z );
- if (0) fprintf(stderr, "z %f out %f\n", *v, out[i]);
- }
- break;
- default:
- gl_problem(ctx, "Bad fog mode in make_fog_coord");
- return;
- }
-}
-
-
-void
-_mesa_make_win_fog_coords( struct vertex_buffer *VB )
-{
- GLvector1f tmp;
-
- make_win_fog_coords( VB, get_fogcoord_ptr( VB->ctx, &tmp ) );
-}
-
-
-
-/*
- * Apply fog to an array of RGBA pixels.
- * Input: n - number of pixels
- * fog - array of interpolated screen-space fog coordinates in [0..1]
- * red, green, blue, alpha - pixel colors
- * Output: red, green, blue, alpha - fogged pixel colors
- */
-void
-_mesa_fog_rgba_pixels( const GLcontext *ctx,
- GLuint n,
- const GLfixed fog[],
- GLubyte rgba[][4] )
-{
- GLfixed rFog = ctx->Fog.Color[0] * 255.0;
- GLfixed gFog = ctx->Fog.Color[1] * 255.0;
- GLfixed bFog = ctx->Fog.Color[2] * 255.0;
- GLuint i;
-
- for (i=0;i<n;i++) {
- GLfixed f = CLAMP(fog[i], 0, FIXED_ONE);
- GLfixed g = FIXED_ONE - f;
-/* fprintf(stderr, "f %d/%f g %d ONE %d\n", f, f/(float)FIXED_ONE, g, FIXED_ONE); */
- rgba[i][0] = (f*rgba[i][0] + g*rFog) >> FIXED_SHIFT;
- rgba[i][1] = (f*rgba[i][1] + g*gFog) >> FIXED_SHIFT;
- rgba[i][2] = (f*rgba[i][2] + g*bFog) >> FIXED_SHIFT;
- }
-}
-
-
-
-
-/*
- * Apply fog to an array of color index pixels.
- * Input: n - number of pixels
- * z - array of integer depth values
- * index - pixel color indexes
- * Output: index - fogged pixel color indexes
- */
-void
-_mesa_fog_ci_pixels( const GLcontext *ctx,
- GLuint n, const GLfixed fog[], GLuint index[] )
-{
- GLuint idx = ctx->Fog.Index;
- GLuint i;
-
- for (i=0;i<n;i++) {
- GLfixed f = FixedToFloat(CLAMP(fog[i], 0, FIXED_ONE));
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F-f) * idx);
- }
-}
-
-
-
-/*
- * Calculate fog coords from window z values
- * Input: n - number of pixels
- * z - array of integer depth values
- * red, green, blue, alpha - pixel colors
- * Output: red, green, blue, alpha - fogged pixel colors
- *
- * Use lookup table & interpolation?
- */
-void
-_mesa_win_fog_coords_from_z( const GLcontext *ctx,
- GLuint n,
- const GLdepth z[],
- GLfixed fogcoord[] )
-{
- GLfloat c = ctx->ProjectionMatrix.m[10];
- GLfloat d = ctx->ProjectionMatrix.m[14];
- GLuint i;
-
- GLfloat tz = ctx->Viewport.WindowMap.m[MAT_TZ];
- GLfloat szInv = 1.0F / ctx->Viewport.WindowMap.m[MAT_SZ];
-
- switch (ctx->Fog.Mode) {
- case GL_LINEAR:
- {
- GLfloat fogEnd = ctx->Fog.End;
- GLfloat fogScale = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = -d / (c+ndcz);
- if (eyez < 0.0) eyez = -eyez;
- fogcoord[i] = (fogEnd - eyez) * fogScale;
- }
- }
- break;
- case GL_EXP:
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = d / (c+ndcz);
- if (eyez < 0.0) eyez = -eyez;
- fogcoord[i] = exp( -ctx->Fog.Density * eyez );
- }
- break;
- case GL_EXP2:
- {
- GLfloat negDensitySquared = -ctx->Fog.Density * ctx->Fog.Density;
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = d / (c+ndcz);
- GLfloat tmp = negDensitySquared * eyez * eyez;
-#ifdef __alpha__
- if (tmp < FLT_MIN_10_EXP)
- tmp = FLT_MIN_10_EXP;
-#endif
- fogcoord[i] = exp( tmp );
- }
- }
- break;
- default:
- gl_problem(ctx, "Bad fog mode in _mesa_win_fog_coords_from_z");
- return;
- }
-}
-
-
-/*
- * Apply fog to an array of RGBA pixels.
- * Input: n - number of pixels
- * z - array of integer depth values
- * red, green, blue, alpha - pixel colors
- * Output: red, green, blue, alpha - fogged pixel colors
- */
-void
-_mesa_depth_fog_rgba_pixels( const GLcontext *ctx,
- GLuint n, const GLdepth z[], GLubyte rgba[][4] )
-{
- GLfixed fog[MAX_WIDTH];
- _mesa_win_fog_coords_from_z( ctx, n, z, fog );
- _mesa_fog_rgba_pixels( ctx, n, fog, rgba );
-}
-
-
-/*
- * Apply fog to an array of color index pixels.
- * Input: n - number of pixels
- * z - array of integer depth values
- * index - pixel color indexes
- * Output: index - fogged pixel color indexes
- */
-void
-_mesa_depth_fog_ci_pixels( const GLcontext *ctx,
- GLuint n, const GLdepth z[], GLuint index[] )
-{
- GLfixed fog[MAX_WIDTH];
- _mesa_win_fog_coords_from_z( ctx, n, z, fog );
- _mesa_fog_ci_pixels( ctx, n, fog, index );
-}
-
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