| /* |
| * Mesa 3-D graphics library |
| * Version: 6.3 |
| * |
| * Copyright (C) 1999-2005 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 "imports.h" |
| #include "context.h" |
| #include "depth.h" |
| #include "enums.h" |
| #include "hash.h" |
| #include "macros.h" |
| #include "mtypes.h" |
| |
| |
| /**********************************************************************/ |
| /***** API Functions *****/ |
| /**********************************************************************/ |
| |
| |
| |
| void GLAPIENTRY |
| _mesa_ClearDepth( GLclampd depth ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| ASSERT_OUTSIDE_BEGIN_END(ctx); |
| |
| depth = CLAMP( depth, 0.0, 1.0 ); |
| |
| if (ctx->Depth.Clear == depth) |
| return; |
| |
| FLUSH_VERTICES(ctx, _NEW_DEPTH); |
| ctx->Depth.Clear = depth; |
| if (ctx->Driver.ClearDepth) |
| (*ctx->Driver.ClearDepth)( ctx, ctx->Depth.Clear ); |
| } |
| |
| |
| |
| void GLAPIENTRY |
| _mesa_DepthFunc( GLenum func ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| ASSERT_OUTSIDE_BEGIN_END(ctx); |
| |
| if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE)) |
| _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func)); |
| |
| switch (func) { |
| case GL_LESS: /* (default) pass if incoming z < stored z */ |
| case GL_GEQUAL: |
| case GL_LEQUAL: |
| case GL_GREATER: |
| case GL_NOTEQUAL: |
| case GL_EQUAL: |
| case GL_ALWAYS: |
| case GL_NEVER: |
| break; |
| default: |
| _mesa_error( ctx, GL_INVALID_ENUM, "glDepth.Func" ); |
| return; |
| } |
| |
| if (ctx->Depth.Func == func) |
| return; |
| |
| FLUSH_VERTICES(ctx, _NEW_DEPTH); |
| ctx->Depth.Func = func; |
| |
| if (ctx->Driver.DepthFunc) |
| ctx->Driver.DepthFunc( ctx, func ); |
| } |
| |
| |
| |
| void GLAPIENTRY |
| _mesa_DepthMask( GLboolean flag ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| ASSERT_OUTSIDE_BEGIN_END(ctx); |
| |
| if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE)) |
| _mesa_debug(ctx, "glDepthMask %d\n", flag); |
| |
| /* |
| * GL_TRUE indicates depth buffer writing is enabled (default) |
| * GL_FALSE indicates depth buffer writing is disabled |
| */ |
| if (ctx->Depth.Mask == flag) |
| return; |
| |
| FLUSH_VERTICES(ctx, _NEW_DEPTH); |
| ctx->Depth.Mask = flag; |
| |
| if (ctx->Driver.DepthMask) |
| ctx->Driver.DepthMask( ctx, flag ); |
| } |
| |
| |
| |
| /** |
| * Specified by the GL_EXT_depth_bounds_test extension. |
| */ |
| void GLAPIENTRY |
| _mesa_DepthBoundsEXT( GLclampd zmin, GLclampd zmax ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| ASSERT_OUTSIDE_BEGIN_END(ctx); |
| |
| if (zmin > zmax) { |
| _mesa_error(ctx, GL_INVALID_VALUE, "glDepthBoundsEXT(zmin > zmax)"); |
| return; |
| } |
| |
| zmin = CLAMP(zmin, 0.0, 1.0); |
| zmax = CLAMP(zmax, 0.0, 1.0); |
| |
| if (ctx->Depth.BoundsMin == zmin && ctx->Depth.BoundsMax == zmax) |
| return; |
| |
| FLUSH_VERTICES(ctx, _NEW_DEPTH); |
| ctx->Depth.BoundsMin = (GLfloat) zmin; |
| ctx->Depth.BoundsMax = (GLfloat) zmax; |
| } |
| |
| |
| /**********************************************************************/ |
| /***** Initialization *****/ |
| /**********************************************************************/ |
| |
| |
| /** |
| * Initialize the depth buffer attribute group in the given context. |
| */ |
| void _mesa_init_depth( GLcontext * ctx ) |
| { |
| /* Depth buffer group */ |
| ctx->Depth.Test = GL_FALSE; |
| ctx->Depth.Clear = 1.0; |
| ctx->Depth.Func = GL_LESS; |
| ctx->Depth.Mask = GL_TRUE; |
| ctx->Depth.OcclusionTest = GL_FALSE; |
| |
| /* XXX this is now per-framebuffer state */ |
| #if 00 |
| /* Z buffer stuff */ |
| if (ctx->Visual.depthBits == 0) { |
| /* Special case. Even if we don't have a depth buffer we need |
| * good values for DepthMax for Z vertex transformation purposes |
| * and for per-fragment fog computation. |
| */ |
| ctx->DepthMax = (1 << 16) - 1; |
| ctx->DepthMaxF = (GLfloat) ctx->DepthMax; |
| } |
| else if (ctx->Visual.depthBits < 32) { |
| ctx->DepthMax = (1 << ctx->Visual.depthBits) - 1; |
| ctx->DepthMaxF = (GLfloat) ctx->DepthMax; |
| } |
| else { |
| /* Special case since shift values greater than or equal to the |
| * number of bits in the left hand expression's type are undefined. |
| */ |
| ctx->DepthMax = 0xffffffff; |
| ctx->DepthMaxF = (GLfloat) ctx->DepthMax; |
| } |
| ctx->MRD = 1.0; /* Minimum resolvable depth value, for polygon offset */ |
| #endif |
| } |