mirror of
https://github.com/reactos/reactos.git
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159 lines
4.2 KiB
C
159 lines
4.2 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.1
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*
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* Copyright (C) 1999-2007 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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/**********************************************************************/
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/***** API Functions *****/
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/**********************************************************************/
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void GLAPIENTRY
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_mesa_ClearDepth( GLclampd depth )
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{
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glClearDepth(%f)\n", depth);
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depth = CLAMP( depth, 0.0, 1.0 );
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if (ctx->Depth.Clear == depth)
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return;
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FLUSH_VERTICES(ctx, _NEW_DEPTH);
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ctx->Depth.Clear = depth;
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if (ctx->Driver.ClearDepth)
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(*ctx->Driver.ClearDepth)( ctx, ctx->Depth.Clear );
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}
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void GLAPIENTRY
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_mesa_DepthFunc( GLenum func )
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{
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func));
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switch (func) {
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case GL_LESS: /* (default) pass if incoming z < stored z */
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case GL_GEQUAL:
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case GL_LEQUAL:
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case GL_GREATER:
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case GL_NOTEQUAL:
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case GL_EQUAL:
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case GL_ALWAYS:
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case GL_NEVER:
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break;
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default:
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_mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" );
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return;
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}
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if (ctx->Depth.Func == func)
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return;
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FLUSH_VERTICES(ctx, _NEW_DEPTH);
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ctx->Depth.Func = func;
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if (ctx->Driver.DepthFunc)
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ctx->Driver.DepthFunc( ctx, func );
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}
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void GLAPIENTRY
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_mesa_DepthMask( GLboolean flag )
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{
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glDepthMask %d\n", flag);
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/*
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* GL_TRUE indicates depth buffer writing is enabled (default)
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* GL_FALSE indicates depth buffer writing is disabled
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*/
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if (ctx->Depth.Mask == flag)
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return;
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FLUSH_VERTICES(ctx, _NEW_DEPTH);
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ctx->Depth.Mask = flag;
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if (ctx->Driver.DepthMask)
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ctx->Driver.DepthMask( ctx, flag );
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}
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/**
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* Specified by the GL_EXT_depth_bounds_test extension.
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*/
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void GLAPIENTRY
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_mesa_DepthBoundsEXT( GLclampd zmin, GLclampd zmax )
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{
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glDepthBounds(%f, %f)\n", zmin, zmax);
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if (zmin > zmax) {
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_mesa_error(ctx, GL_INVALID_VALUE, "glDepthBoundsEXT(zmin > zmax)");
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return;
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}
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zmin = CLAMP(zmin, 0.0, 1.0);
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zmax = CLAMP(zmax, 0.0, 1.0);
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if (ctx->Depth.BoundsMin == zmin && ctx->Depth.BoundsMax == zmax)
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return;
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FLUSH_VERTICES(ctx, _NEW_DEPTH);
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ctx->Depth.BoundsMin = (GLfloat) zmin;
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ctx->Depth.BoundsMax = (GLfloat) zmax;
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}
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/**********************************************************************/
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/***** Initialization *****/
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/**********************************************************************/
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/**
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* Initialize the depth buffer attribute group in the given context.
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*/
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void
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_mesa_init_depth(struct gl_context *ctx)
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{
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ctx->Depth.Test = GL_FALSE;
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ctx->Depth.Clear = 1.0;
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ctx->Depth.Func = GL_LESS;
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ctx->Depth.Mask = GL_TRUE;
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}
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