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205 lines
5.5 KiB
C
205 lines
5.5 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 5.1
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*
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* Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <precomp.h>
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void GLAPIENTRY
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_mesa_Fogf(GLenum pname, GLfloat param)
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{
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GLfloat fparam[4];
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fparam[0] = param;
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fparam[1] = fparam[2] = fparam[3] = 0.0F;
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_mesa_Fogfv(pname, fparam);
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}
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void GLAPIENTRY
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_mesa_Fogi(GLenum pname, GLint param )
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{
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GLfloat fparam[4];
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fparam[0] = (GLfloat) param;
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fparam[1] = fparam[2] = fparam[3] = 0.0F;
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_mesa_Fogfv(pname, fparam);
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}
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void GLAPIENTRY
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_mesa_Fogiv(GLenum pname, const GLint *params )
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{
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GLfloat p[4];
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switch (pname) {
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case GL_FOG_MODE:
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case GL_FOG_DENSITY:
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case GL_FOG_START:
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case GL_FOG_END:
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case GL_FOG_INDEX:
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case GL_FOG_COORDINATE_SOURCE_EXT:
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p[0] = (GLfloat) *params;
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break;
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case GL_FOG_COLOR:
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p[0] = INT_TO_FLOAT( params[0] );
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p[1] = INT_TO_FLOAT( params[1] );
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p[2] = INT_TO_FLOAT( params[2] );
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p[3] = INT_TO_FLOAT( params[3] );
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break;
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default:
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/* Error will be caught later in _mesa_Fogfv */
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ASSIGN_4V(p, 0.0F, 0.0F, 0.0F, 0.0F);
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}
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_mesa_Fogfv(pname, p);
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}
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/**
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* Update the gl_fog_attrib::_Scale field.
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*/
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static void
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update_fog_scale(struct gl_context *ctx)
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{
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if (ctx->Fog.End == ctx->Fog.Start)
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ctx->Fog._Scale = 1.0f;
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else
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ctx->Fog._Scale = 1.0f / (ctx->Fog.End - ctx->Fog.Start);
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}
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void GLAPIENTRY
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_mesa_Fogfv( GLenum pname, const GLfloat *params )
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{
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GET_CURRENT_CONTEXT(ctx);
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GLenum m;
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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switch (pname) {
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case GL_FOG_MODE:
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m = (GLenum) (GLint) *params;
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switch (m) {
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case GL_LINEAR:
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case GL_EXP:
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case GL_EXP2:
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break;
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default:
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_mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
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return;
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}
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if (ctx->Fog.Mode == m)
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return;
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FLUSH_VERTICES(ctx, _NEW_FOG);
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ctx->Fog.Mode = m;
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break;
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case GL_FOG_DENSITY:
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if (*params<0.0) {
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_mesa_error( ctx, GL_INVALID_VALUE, "glFog" );
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return;
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}
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if (ctx->Fog.Density == *params)
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return;
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FLUSH_VERTICES(ctx, _NEW_FOG);
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ctx->Fog.Density = *params;
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break;
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case GL_FOG_START:
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if (ctx->Fog.Start == *params)
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return;
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FLUSH_VERTICES(ctx, _NEW_FOG);
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ctx->Fog.Start = *params;
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update_fog_scale(ctx);
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break;
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case GL_FOG_END:
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if (ctx->Fog.End == *params)
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return;
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FLUSH_VERTICES(ctx, _NEW_FOG);
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ctx->Fog.End = *params;
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update_fog_scale(ctx);
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break;
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case GL_FOG_INDEX:
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if (ctx->Fog.Index == *params)
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return;
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FLUSH_VERTICES(ctx, _NEW_FOG);
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ctx->Fog.Index = *params;
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break;
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case GL_FOG_COLOR:
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if (TEST_EQ_4V(ctx->Fog.Color, params))
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return;
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FLUSH_VERTICES(ctx, _NEW_FOG);
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ctx->Fog.Color[0] = params[0];
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ctx->Fog.Color[1] = params[1];
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ctx->Fog.Color[2] = params[2];
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ctx->Fog.Color[3] = params[3];
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break;
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case GL_FOG_COORDINATE_SOURCE_EXT: {
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GLenum p = (GLenum) (GLint) *params;
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if (!ctx->Extensions.EXT_fog_coord ||
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(p != GL_FOG_COORDINATE_EXT && p != GL_FRAGMENT_DEPTH_EXT)) {
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_mesa_error(ctx, GL_INVALID_ENUM, "glFog");
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return;
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}
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if (ctx->Fog.FogCoordinateSource == p)
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return;
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FLUSH_VERTICES(ctx, _NEW_FOG);
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ctx->Fog.FogCoordinateSource = p;
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break;
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}
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case GL_FOG_DISTANCE_MODE_NV: {
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GLenum p = (GLenum) (GLint) *params;
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if (!ctx->Extensions.NV_fog_distance ||
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(p != GL_EYE_RADIAL_NV && p != GL_EYE_PLANE && p != GL_EYE_PLANE_ABSOLUTE_NV)) {
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_mesa_error(ctx, GL_INVALID_ENUM, "glFog");
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return;
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}
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if (ctx->Fog.FogDistanceMode == p)
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return;
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FLUSH_VERTICES(ctx, _NEW_FOG);
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ctx->Fog.FogDistanceMode = p;
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break;
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}
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default:
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_mesa_error( ctx, GL_INVALID_ENUM, "glFog" );
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return;
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}
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if (ctx->Driver.Fogfv) {
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(*ctx->Driver.Fogfv)( ctx, pname, params );
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}
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}
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/**********************************************************************/
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/***** Initialization *****/
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/**********************************************************************/
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void _mesa_init_fog( struct gl_context * ctx )
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{
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/* Fog group */
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ctx->Fog.Enabled = GL_FALSE;
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ctx->Fog.Mode = GL_EXP;
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ASSIGN_4V( ctx->Fog.Color, 0.0, 0.0, 0.0, 0.0 );
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ctx->Fog.Index = 0.0;
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ctx->Fog.Density = 1.0;
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ctx->Fog.Start = 0.0;
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ctx->Fog.End = 1.0;
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ctx->Fog.FogCoordinateSource = GL_FRAGMENT_DEPTH_EXT;
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ctx->Fog._Scale = 1.0f;
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ctx->Fog.FogDistanceMode = GL_EYE_PLANE_ABSOLUTE_NV;
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}
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