| /* |
| * Mesa 3-D graphics library |
| * Version: 5.1 |
| * |
| * 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. |
| */ |
| |
| |
| #include "glheader.h" |
| #include "colormac.h" |
| #include "context.h" |
| #include "fog.h" |
| #include "mtypes.h" |
| |
| |
| |
| void GLAPIENTRY |
| _mesa_Fogf(GLenum pname, GLfloat param) |
| { |
| _mesa_Fogfv(pname, ¶m); |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_Fogi(GLenum pname, GLint param ) |
| { |
| GLfloat fparam = (GLfloat) param; |
| _mesa_Fogfv(pname, &fparam); |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_Fogiv(GLenum pname, const GLint *params ) |
| { |
| GLfloat p[4]; |
| switch (pname) { |
| case GL_FOG_MODE: |
| case GL_FOG_DENSITY: |
| case GL_FOG_START: |
| case GL_FOG_END: |
| case GL_FOG_INDEX: |
| case GL_FOG_COORDINATE_SOURCE_EXT: |
| p[0] = (GLfloat) *params; |
| break; |
| case GL_FOG_COLOR: |
| p[0] = INT_TO_FLOAT( params[0] ); |
| p[1] = INT_TO_FLOAT( params[1] ); |
| p[2] = INT_TO_FLOAT( params[2] ); |
| p[3] = INT_TO_FLOAT( params[3] ); |
| break; |
| default: |
| /* Error will be caught later in _mesa_Fogfv */ |
| ; |
| } |
| _mesa_Fogfv(pname, p); |
| } |
| |
| |
| #define UPDATE_FOG_SCALE(ctx) do {\ |
| if (ctx->Fog.End == ctx->Fog.Start)\ |
| ctx->Fog._Scale = 1.0f;\ |
| else\ |
| ctx->Fog._Scale = 1.0f / (ctx->Fog.End - ctx->Fog.Start);\ |
| } while(0) |
| |
| |
| void GLAPIENTRY |
| _mesa_Fogfv( GLenum pname, const GLfloat *params ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| GLenum m; |
| ASSERT_OUTSIDE_BEGIN_END(ctx); |
| |
| switch (pname) { |
| case GL_FOG_MODE: |
| m = (GLenum) (GLint) *params; |
| 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) { |
| _mesa_error( ctx, GL_INVALID_VALUE, "glFog" ); |
| return; |
| } |
| 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; |
| UPDATE_FOG_SCALE(ctx); |
| break; |
| case GL_FOG_END: |
| if (ctx->Fog.End == *params) |
| return; |
| FLUSH_VERTICES(ctx, _NEW_FOG); |
| ctx->Fog.End = *params; |
| UPDATE_FOG_SCALE(ctx); |
| break; |
| case GL_FOG_INDEX: |
| 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] = 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; |
| case GL_FOG_COORDINATE_SOURCE_EXT: { |
| 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: |
| _mesa_error( ctx, GL_INVALID_ENUM, "glFog" ); |
| return; |
| } |
| |
| if (ctx->Driver.Fogfv) { |
| (*ctx->Driver.Fogfv)( ctx, pname, params ); |
| } |
| } |
| |
| |
| /**********************************************************************/ |
| /***** Initialization *****/ |
| /**********************************************************************/ |
| |
| void _mesa_init_fog( GLcontext * ctx ) |
| { |
| /* Fog group */ |
| ctx->Fog.Enabled = GL_FALSE; |
| ctx->Fog.Mode = GL_EXP; |
| ASSIGN_4V( ctx->Fog.Color, 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._Scale = 1.0f; |
| } |