/* * Mesa 3-D graphics library * * 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 * 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. */ #include "glheader.h" #include "colormac.h" #include "context.h" #include "fog.h" #include "macros.h" #include "mtypes.h" void GLAPIENTRY _mesa_Fogf(GLenum pname, GLfloat param) { GLfloat fparam[4]; fparam[0] = param; fparam[1] = fparam[2] = fparam[3] = 0.0F; _mesa_Fogfv(pname, fparam); } void GLAPIENTRY _mesa_Fogi(GLenum pname, GLint param ) { GLfloat fparam[4]; fparam[0] = (GLfloat) param; fparam[1] = fparam[2] = fparam[3] = 0.0F; _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 */ ASSIGN_4V(p, 0.0F, 0.0F, 0.0F, 0.0F); } _mesa_Fogfv(pname, p); } /** * Update the gl_fog_attrib::_Scale field. */ static void update_fog_scale(struct gl_context *ctx) { if (ctx->Fog.End == ctx->Fog.Start) ctx->Fog._Scale = 1.0f; else ctx->Fog._Scale = 1.0f / (ctx->Fog.End - ctx->Fog.Start); } void GLAPIENTRY _mesa_Fogfv( GLenum pname, const GLfloat *params ) { GET_CURRENT_CONTEXT(ctx); GLenum m; 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->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: 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; 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; } 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; } if (ctx->Driver.Fogfv) { (*ctx->Driver.Fogfv)( ctx, pname, params ); } return; invalid_pname: _mesa_error( ctx, GL_INVALID_ENUM, "glFog" ); return; } /**********************************************************************/ /***** Initialization *****/ /**********************************************************************/ void _mesa_init_fog( struct gl_context * 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 ); 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._Scale = 1.0f; ctx->Fog.FogDistanceMode = GL_EYE_PLANE_ABSOLUTE_NV; }