| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 1999-2007 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 "imports.h" |
| #include "context.h" |
| #include "depth.h" |
| #include "enums.h" |
| #include "macros.h" |
| #include "mtypes.h" |
| |
| |
| /**********************************************************************/ |
| /***** API Functions *****/ |
| /**********************************************************************/ |
| |
| |
| |
| void GLAPIENTRY |
| _mesa_ClearDepth( GLclampd depth ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glClearDepth(%f)\n", depth); |
| |
| ctx->Depth.Clear = CLAMP( depth, 0.0, 1.0 ); |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_ClearDepthf( GLclampf depth ) |
| { |
| _mesa_ClearDepth(depth); |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_DepthFunc( GLenum func ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glDepthFunc %s\n", _mesa_enum_to_string(func)); |
| |
| if (ctx->Depth.Func == func) |
| return; |
| |
| 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; |
| } |
| |
| 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); |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _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); |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glDepthBounds(%f, %f)\n", zmin, zmax); |
| |
| 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(struct gl_context *ctx) |
| { |
| ctx->Depth.Test = GL_FALSE; |
| ctx->Depth.Clear = 1.0; |
| ctx->Depth.Func = GL_LESS; |
| ctx->Depth.Mask = GL_TRUE; |
| } |