-/* $Id: fog.c,v 1.17 2000/07/07 14:59:32 keithw Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 3.3
- *
- * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
- *
+ *
+ * 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.
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
-#ifdef PC_HEADER
-#include "all.h"
-#else
#include "glheader.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 GLAPIENTRY
_mesa_Fogf(GLenum pname, GLfloat param)
{
- _mesa_Fogfv(pname, ¶m);
+ GLfloat fparam[4];
+ fparam[0] = param;
+ fparam[1] = fparam[2] = fparam[3] = 0.0F;
+ _mesa_Fogfv(pname, fparam);
}
-void
+void GLAPIENTRY
_mesa_Fogi(GLenum pname, GLint param )
{
- GLfloat fparam = (GLfloat) param;
- _mesa_Fogfv(pname, &fparam);
+ GLfloat fparam[4];
+ fparam[0] = (GLfloat) param;
+ fparam[1] = fparam[2] = fparam[3] = 0.0F;
+ _mesa_Fogfv(pname, fparam);
}
-void
+void GLAPIENTRY
_mesa_Fogiv(GLenum pname, const GLint *params )
{
GLfloat p[4];
case GL_FOG_START:
case GL_FOG_END:
case GL_FOG_INDEX:
+ case GL_FOG_COORDINATE_SOURCE_EXT:
+ case GL_FOG_DISTANCE_MODE_NV:
p[0] = (GLfloat) *params;
break;
case GL_FOG_COLOR:
break;
default:
/* Error will be caught later in _mesa_Fogfv */
- ;
+ ASSIGN_4V(p, 0.0F, 0.0F, 0.0F, 0.0F);
}
_mesa_Fogfv(pname, p);
}
-void
+void GLAPIENTRY
_mesa_Fogfv( GLenum pname, const GLfloat *params )
{
GET_CURRENT_CONTEXT(ctx);
GLenum m;
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glFog");
-
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:
+ ctx->Fog._PackedMode = FOG_LINEAR;
+ break;
+ case GL_EXP:
+ ctx->Fog._PackedMode = FOG_EXP;
+ break;
+ case GL_EXP2:
+ ctx->Fog._PackedMode = FOG_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;
+ ctx->Fog._PackedEnabledMode = ctx->Fog.Enabled ?
+ ctx->Fog._PackedMode : FOG_NONE;
break;
case GL_FOG_DENSITY:
- if (*params<0.0) {
- gl_error( ctx, GL_INVALID_VALUE, "glFog" );
+ if (*params<0.0F) {
+ _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:
- ctx->Fog.Start = *params;
- break;
+ if (ctx->Fog.Start == *params)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.Start = *params;
+ break;
case GL_FOG_END:
- ctx->Fog.End = *params;
- break;
+ 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->API != API_OPENGL_COMPAT)
+ goto invalid_pname;
+ if (ctx->Fog.Index == *params)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.Index = *params;
break;
case GL_FOG_COLOR:
- ctx->Fog.Color[0] = params[0];
- ctx->Fog.Color[1] = params[1];
- ctx->Fog.Color[2] = params[2];
- ctx->Fog.Color[3] = params[3];
+ if (TEST_EQ_4V(ctx->Fog.Color, params))
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.ColorUnclamped[0] = params[0];
+ ctx->Fog.ColorUnclamped[1] = params[1];
+ ctx->Fog.ColorUnclamped[2] = params[2];
+ ctx->Fog.ColorUnclamped[3] = params[3];
+ ctx->Fog.Color[0] = CLAMP(params[0], 0.0F, 1.0F);
+ ctx->Fog.Color[1] = CLAMP(params[1], 0.0F, 1.0F);
+ ctx->Fog.Color[2] = CLAMP(params[2], 0.0F, 1.0F);
+ ctx->Fog.Color[3] = CLAMP(params[3], 0.0F, 1.0F);
break;
- default:
- gl_error( ctx, GL_INVALID_ENUM, "glFog" );
- return;
- }
-
- if (ctx->Driver.Fogfv) {
- (*ctx->Driver.Fogfv)( ctx, pname, params );
- }
-
- ctx->NewState |= NEW_FOG;
-}
-
-
-typedef void (*fog_func)( struct vertex_buffer *VB, GLuint side,
- GLubyte flag );
-
-typedef void (*fog_coord_func)( struct vertex_buffer *VB,
- const GLvector4f *from,
- GLubyte flag );
-
-static fog_func fog_ci_tab[2];
-static fog_func fog_rgba_tab[2];
-static fog_coord_func make_fog_coord_tab[2];
-
-/*
- * Compute the fogged color for an array of vertices.
- * Input: n - number of vertices
- * v - array of vertices
- * color - the original vertex colors
- * Output: color - the fogged colors
- *
- */
-#define TAG(x) x##_raw
-#define CULLCHECK
-#define IDX 0
-#include "fog_tmp.h"
-
-#define TAG(x) x##_masked
-#define CULLCHECK if (cullmask[i]&flag)
-#define IDX 1
-#include "fog_tmp.h"
-
-
-void
-_mesa_init_fog( void )
-{
- init_fog_tab_masked();
- init_fog_tab_raw();
-}
-
-
-/*
- * Compute fog for the vertices in the vertex buffer.
- */
-void
-_mesa_fog_vertices( struct vertex_buffer *VB )
-{
- GLcontext *ctx = VB->ctx;
- GLuint i = VB->CullMode & 1;
-
- if (ctx->Visual->RGBAflag) {
- /* Fog RGB colors */
- if (ctx->TriangleCaps & DD_TRI_LIGHT_TWOSIDE) {
- fog_rgba_tab[i]( VB, 0, VERT_FACE_FRONT );
- fog_rgba_tab[i]( VB, 1, VERT_FACE_REAR );
- } else {
- fog_rgba_tab[i]( VB, 0, VERT_FACE_FRONT|VERT_FACE_REAR );
+ case GL_FOG_COORDINATE_SOURCE_EXT: {
+ GLenum p = (GLenum) (GLint) *params;
+ if (ctx->API != API_OPENGL_COMPAT ||
+ (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;
}
- }
- else {
- /* Fog color indexes */
- if (ctx->TriangleCaps & DD_TRI_LIGHT_TWOSIDE) {
- fog_ci_tab[i]( VB, 0, VERT_FACE_FRONT );
- fog_ci_tab[i]( VB, 1, VERT_FACE_REAR );
- } else {
- fog_ci_tab[i]( VB, 0, VERT_FACE_FRONT|VERT_FACE_REAR );
+ case GL_FOG_DISTANCE_MODE_NV: {
+ GLenum p = (GLenum) (GLint) *params;
+ if (ctx->API != API_OPENGL_COMPAT || !ctx->Extensions.NV_fog_distance ||
+ (p != GL_EYE_RADIAL_NV && p != GL_EYE_PLANE && p != GL_EYE_PLANE_ABSOLUTE_NV)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glFog");
+ return;
+ }
+ if (ctx->Fog.FogDistanceMode == p)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_FOG);
+ ctx->Fog.FogDistanceMode = p;
+ break;
}
+ default:
+ goto invalid_pname;
}
-}
-
-
-static void check_fog_coords( GLcontext *ctx, struct gl_pipeline_stage *d )
-{
- d->type = 0;
-
- if (ctx->FogMode==FOG_FRAGMENT)
- {
- d->type = PIPE_IMMEDIATE|PIPE_PRECALC;
- d->inputs = VERT_OBJ_ANY;
- d->outputs = VERT_FOG_COORD;
- }
-}
-
-static void gl_make_fog_coords( struct vertex_buffer *VB )
-{
- GLcontext *ctx = VB->ctx;
-
- /* If full eye coords weren't required, just calculate the eye Z
- * values.
- */
- 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];
-
- gl_dotprod_tab[0][VB->ObjPtr->size](&VB->Eye,
- 2, /* fill z coordinates */
- VB->ObjPtr,
- plane,
- 0 );
-
- make_fog_coord_tab[0]( VB, &VB->Eye, 0 );
- }
- else
- {
- make_fog_coord_tab[0]( VB, VB->EyePtr, 0 );
+ if (ctx->Driver.Fogfv) {
+ ctx->Driver.Fogfv( ctx, pname, params );
}
-}
-
-
-/* Drivers that want fog coordinates in VB->Spec[0] alpha, can substitute this
- * stage for the default PIPE_OP_FOG pipeline stage.
- */
-struct gl_pipeline_stage gl_fog_coord_stage = {
- "build fog coordinates",
- PIPE_OP_FOG,
- PIPE_PRECALC|PIPE_IMMEDIATE,
- 0,
- NEW_FOG,
- NEW_LIGHTING|NEW_RASTER_OPS|NEW_FOG|NEW_MODELVIEW,
- 0, 0,
- 0, 0, 0,
- check_fog_coords,
- gl_make_fog_coords
-};
-
-
-
-
-
-/*
- * 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_fog_rgba_pixels( const GLcontext *ctx,
- GLuint n, const GLdepth z[], GLubyte rgba[][4] )
-{
- GLfloat c = ctx->ProjectionMatrix.m[10];
- GLfloat d = ctx->ProjectionMatrix.m[14];
- GLuint i;
-
- GLfloat rFog = ctx->Fog.Color[0] * 255.0F;
- GLfloat gFog = ctx->Fog.Color[1] * 255.0F;
- GLfloat bFog = ctx->Fog.Color[2] * 255.0F;
- GLfloat tz = ctx->Viewport.WindowMap.m[MAT_TZ];
- GLfloat szInv = 1.0F / ctx->Viewport.WindowMap.m[MAT_SZ];
+ return;
- 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);
- GLfloat f, g;
- if (eyez < 0.0) eyez = -eyez;
- f = (fogEnd - eyez) * fogScale;
- f = CLAMP( f, 0.0F, 1.0F );
- g = 1.0F - f;
- rgba[i][RCOMP] = (GLint) (f * rgba[i][RCOMP] + g * rFog);
- rgba[i][GCOMP] = (GLint) (f * rgba[i][GCOMP] + g * gFog);
- rgba[i][BCOMP] = (GLint) (f * rgba[i][BCOMP] + g * bFog);
- }
- }
- break;
- case GL_EXP:
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = d / (c+ndcz);
- GLfloat f, g;
- if (eyez < 0.0)
- eyez = -eyez;
- f = exp( -ctx->Fog.Density * eyez );
- g = 1.0F - f;
- rgba[i][RCOMP] = (GLint) (f * rgba[i][RCOMP] + g * rFog);
- rgba[i][GCOMP] = (GLint) (f * rgba[i][GCOMP] + g * gFog);
- rgba[i][BCOMP] = (GLint) (f * rgba[i][BCOMP] + g * bFog);
- }
- 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 f, g;
- GLfloat tmp = negDensitySquared * eyez * eyez;
-#ifdef __alpha__
- /* XXX this underflow check may be needed for other systems */
- if (tmp < FLT_MIN_10_EXP)
- f = exp( FLT_MIN_10_EXP );
- else
-#endif
- f = exp( tmp );
- g = 1.0F - f;
- rgba[i][RCOMP] = (GLint) (f * rgba[i][RCOMP] + g * rFog);
- rgba[i][GCOMP] = (GLint) (f * rgba[i][GCOMP] + g * gFog);
- rgba[i][BCOMP] = (GLint) (f * rgba[i][BCOMP] + g * bFog);
- }
- }
- break;
- default:
- gl_problem(ctx, "Bad fog mode in _mesa_fog_rgba_pixels");
- return;
- }
+invalid_pname:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
+ return;
}
+/**********************************************************************/
+/***** Initialization *****/
+/**********************************************************************/
-
-/*
- * 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 GLdepth z[], GLuint index[] )
+void _mesa_init_fog( struct gl_context * ctx )
{
- 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);
- GLfloat f;
- if (eyez < 0.0) eyez = -eyez;
- f = (fogEnd - eyez) * fogScale;
- f = CLAMP( f, 0.0F, 1.0F );
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F-f) * ctx->Fog.Index);
- }
- }
- break;
- case GL_EXP:
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = -d / (c+ndcz);
- GLfloat f;
- if (eyez < 0.0)
- eyez = -eyez;
- f = exp( -ctx->Fog.Density * eyez );
- f = CLAMP( f, 0.0F, 1.0F );
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F-f) * ctx->Fog.Index);
- }
- 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, f;
- if (eyez < 0.0)
- eyez = -eyez;
- tmp = negDensitySquared * eyez * eyez;
-#ifdef __alpha__
- /* XXX this underflow check may be needed for other systems */
- if (tmp < FLT_MIN_10_EXP)
- f = exp( FLT_MIN_10_EXP );
- else
-#endif
- f = exp( tmp );
- f = CLAMP( f, 0.0F, 1.0F );
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F-f) * ctx->Fog.Index);
- }
- }
- break;
- default:
- gl_problem(ctx, "Bad fog mode in _mesa_fog_ci_pixels");
- return;
- }
+ /* Fog group */
+ ctx->Fog.Enabled = GL_FALSE;
+ ctx->Fog.Mode = GL_EXP;
+ ctx->Fog._PackedMode = FOG_EXP;
+ ctx->Fog._PackedEnabledMode = FOG_NONE;
+ ASSIGN_4V( ctx->Fog.Color, 0.0, 0.0, 0.0, 0.0 );
+ ASSIGN_4V( ctx->Fog.ColorUnclamped, 0.0, 0.0, 0.0, 0.0 );
+ ctx->Fog.Index = 0.0;
+ ctx->Fog.Density = 1.0;
+ ctx->Fog.Start = 0.0;
+ ctx->Fog.End = 1.0;
+ ctx->Fog.ColorSumEnabled = GL_FALSE;
+ ctx->Fog.FogCoordinateSource = GL_FRAGMENT_DEPTH_EXT;
+ ctx->Fog.FogDistanceMode = GL_EYE_PLANE_ABSOLUTE_NV;
}
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