0,0 → 1,162 |
/* |
* 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. |
*/ |
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#include "glheader.h" |
#include "imports.h" |
#include "context.h" |
#include "depth.h" |
#include "enums.h" |
#include "macros.h" |
#include "mtypes.h" |
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/**********************************************************************/ |
/***** API Functions *****/ |
/**********************************************************************/ |
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void GLAPIENTRY |
_mesa_ClearDepth( GLclampd depth ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
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if (MESA_VERBOSE & VERBOSE_API) |
_mesa_debug(ctx, "glClearDepth(%f)\n", depth); |
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ctx->Depth.Clear = CLAMP( depth, 0.0, 1.0 ); |
} |
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void GLAPIENTRY |
_mesa_ClearDepthf( GLclampf depth ) |
{ |
_mesa_ClearDepth(depth); |
} |
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void GLAPIENTRY |
_mesa_DepthFunc( GLenum func ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
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if (MESA_VERBOSE & VERBOSE_API) |
_mesa_debug(ctx, "glDepthFunc %s\n", _mesa_lookup_enum_by_nr(func)); |
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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; |
} |
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if (ctx->Depth.Func == func) |
return; |
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FLUSH_VERTICES(ctx, _NEW_DEPTH); |
ctx->Depth.Func = func; |
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if (ctx->Driver.DepthFunc) |
ctx->Driver.DepthFunc( ctx, func ); |
} |
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void GLAPIENTRY |
_mesa_DepthMask( GLboolean flag ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
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if (MESA_VERBOSE & VERBOSE_API) |
_mesa_debug(ctx, "glDepthMask %d\n", flag); |
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/* |
* GL_TRUE indicates depth buffer writing is enabled (default) |
* GL_FALSE indicates depth buffer writing is disabled |
*/ |
if (ctx->Depth.Mask == flag) |
return; |
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FLUSH_VERTICES(ctx, _NEW_DEPTH); |
ctx->Depth.Mask = flag; |
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if (ctx->Driver.DepthMask) |
ctx->Driver.DepthMask( ctx, flag ); |
} |
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/** |
* Specified by the GL_EXT_depth_bounds_test extension. |
*/ |
void GLAPIENTRY |
_mesa_DepthBoundsEXT( GLclampd zmin, GLclampd zmax ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
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if (MESA_VERBOSE & VERBOSE_API) |
_mesa_debug(ctx, "glDepthBounds(%f, %f)\n", zmin, zmax); |
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if (zmin > zmax) { |
_mesa_error(ctx, GL_INVALID_VALUE, "glDepthBoundsEXT(zmin > zmax)"); |
return; |
} |
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zmin = CLAMP(zmin, 0.0, 1.0); |
zmax = CLAMP(zmax, 0.0, 1.0); |
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if (ctx->Depth.BoundsMin == zmin && ctx->Depth.BoundsMax == zmax) |
return; |
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FLUSH_VERTICES(ctx, _NEW_DEPTH); |
ctx->Depth.BoundsMin = (GLfloat) zmin; |
ctx->Depth.BoundsMax = (GLfloat) zmax; |
} |
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/**********************************************************************/ |
/***** Initialization *****/ |
/**********************************************************************/ |
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/** |
* 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; |
} |