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/** |
* \file polygon.c |
* Polygon operations. |
*/ |
|
/* |
* Mesa 3-D graphics library |
* |
* Copyright (C) 1999-2006 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 "image.h" |
#include "enums.h" |
#include "pack.h" |
#include "pbo.h" |
#include "polygon.h" |
#include "mtypes.h" |
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/** |
* Specify whether to cull front- or back-facing facets. |
* |
* \param mode culling mode. |
* |
* \sa glCullFace(). |
* |
* Verifies the parameter and updates gl_polygon_attrib::CullFaceMode. On |
* change, flushes the vertices and notifies the driver via |
* the dd_function_table::CullFace callback. |
*/ |
void GLAPIENTRY |
_mesa_CullFace( GLenum mode ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (MESA_VERBOSE&VERBOSE_API) |
_mesa_debug(ctx, "glCullFace %s\n", _mesa_lookup_enum_by_nr(mode)); |
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if (mode!=GL_FRONT && mode!=GL_BACK && mode!=GL_FRONT_AND_BACK) { |
_mesa_error( ctx, GL_INVALID_ENUM, "glCullFace" ); |
return; |
} |
|
if (ctx->Polygon.CullFaceMode == mode) |
return; |
|
FLUSH_VERTICES(ctx, _NEW_POLYGON); |
ctx->Polygon.CullFaceMode = mode; |
|
if (ctx->Driver.CullFace) |
ctx->Driver.CullFace( ctx, mode ); |
} |
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/** |
* Define front- and back-facing |
* |
* \param mode orientation of front-facing polygons. |
* |
* \sa glFrontFace(). |
* |
* Verifies the parameter and updates gl_polygon_attrib::FrontFace. On change |
* flushes the vertices and notifies the driver via |
* the dd_function_table::FrontFace callback. |
*/ |
void GLAPIENTRY |
_mesa_FrontFace( GLenum mode ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (MESA_VERBOSE&VERBOSE_API) |
_mesa_debug(ctx, "glFrontFace %s\n", _mesa_lookup_enum_by_nr(mode)); |
|
if (mode!=GL_CW && mode!=GL_CCW) { |
_mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" ); |
return; |
} |
|
if (ctx->Polygon.FrontFace == mode) |
return; |
|
FLUSH_VERTICES(ctx, _NEW_POLYGON); |
ctx->Polygon.FrontFace = mode; |
|
ctx->Polygon._FrontBit = (GLboolean) (mode == GL_CW); |
|
if (ctx->Driver.FrontFace) |
ctx->Driver.FrontFace( ctx, mode ); |
} |
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/** |
* Set the polygon rasterization mode. |
* |
* \param face the polygons which \p mode applies to. |
* \param mode how polygons should be rasterized. |
* |
* \sa glPolygonMode(). |
* |
* Verifies the parameters and updates gl_polygon_attrib::FrontMode and |
* gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the |
* driver via the dd_function_table::PolygonMode callback. |
*/ |
void GLAPIENTRY |
_mesa_PolygonMode( GLenum face, GLenum mode ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (MESA_VERBOSE&VERBOSE_API) |
_mesa_debug(ctx, "glPolygonMode %s %s\n", |
_mesa_lookup_enum_by_nr(face), |
_mesa_lookup_enum_by_nr(mode)); |
|
if (mode!=GL_POINT && mode!=GL_LINE && mode!=GL_FILL) { |
_mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(mode)" ); |
return; |
} |
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switch (face) { |
case GL_FRONT: |
if (ctx->API == API_OPENGL_CORE) { |
_mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" ); |
return; |
} |
if (ctx->Polygon.FrontMode == mode) |
return; |
FLUSH_VERTICES(ctx, _NEW_POLYGON); |
ctx->Polygon.FrontMode = mode; |
break; |
case GL_FRONT_AND_BACK: |
if (ctx->Polygon.FrontMode == mode && |
ctx->Polygon.BackMode == mode) |
return; |
FLUSH_VERTICES(ctx, _NEW_POLYGON); |
ctx->Polygon.FrontMode = mode; |
ctx->Polygon.BackMode = mode; |
break; |
case GL_BACK: |
if (ctx->API == API_OPENGL_CORE) { |
_mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" ); |
return; |
} |
if (ctx->Polygon.BackMode == mode) |
return; |
FLUSH_VERTICES(ctx, _NEW_POLYGON); |
ctx->Polygon.BackMode = mode; |
break; |
default: |
_mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" ); |
return; |
} |
|
if (ctx->Driver.PolygonMode) |
ctx->Driver.PolygonMode(ctx, face, mode); |
} |
|
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/** |
* This routine updates the ctx->Polygon.Stipple state. |
* If we're getting the stipple data from a PBO, we map the buffer |
* in order to access the data. |
* In any case, we obey the current pixel unpacking parameters when fetching |
* the stipple data. |
* |
* In the future, this routine should be used as a fallback, called via |
* ctx->Driver.PolygonStipple(). We'll have to update all the DRI drivers |
* too. |
*/ |
void |
_mesa_polygon_stipple(struct gl_context *ctx, const GLubyte *pattern) |
{ |
pattern = _mesa_map_validate_pbo_source(ctx, 2, |
&ctx->Unpack, 32, 32, 1, |
GL_COLOR_INDEX, GL_BITMAP, |
INT_MAX, pattern, |
"glPolygonStipple"); |
if (!pattern) |
return; |
|
_mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack); |
|
_mesa_unmap_pbo_source(ctx, &ctx->Unpack); |
} |
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/** |
* Called by glPolygonStipple. |
*/ |
void GLAPIENTRY |
_mesa_PolygonStipple( const GLubyte *pattern ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (MESA_VERBOSE&VERBOSE_API) |
_mesa_debug(ctx, "glPolygonStipple\n"); |
|
FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE); |
|
_mesa_polygon_stipple(ctx, pattern); |
|
if (ctx->Driver.PolygonStipple) |
ctx->Driver.PolygonStipple(ctx, pattern); |
} |
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/** |
* Called by glPolygonStipple. |
*/ |
void GLAPIENTRY |
_mesa_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (MESA_VERBOSE&VERBOSE_API) |
_mesa_debug(ctx, "glGetPolygonStipple\n"); |
|
dest = _mesa_map_validate_pbo_dest(ctx, 2, |
&ctx->Pack, 32, 32, 1, |
GL_COLOR_INDEX, GL_BITMAP, |
bufSize, dest, "glGetPolygonStipple"); |
if (!dest) |
return; |
|
_mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack); |
|
_mesa_unmap_pbo_dest(ctx, &ctx->Pack); |
} |
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void GLAPIENTRY |
_mesa_GetPolygonStipple( GLubyte *dest ) |
{ |
_mesa_GetnPolygonStippleARB(INT_MAX, dest); |
} |
|
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void GLAPIENTRY |
_mesa_PolygonOffset( GLfloat factor, GLfloat units ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
|
if (MESA_VERBOSE&VERBOSE_API) |
_mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units); |
|
if (ctx->Polygon.OffsetFactor == factor && |
ctx->Polygon.OffsetUnits == units) |
return; |
|
FLUSH_VERTICES(ctx, _NEW_POLYGON); |
ctx->Polygon.OffsetFactor = factor; |
ctx->Polygon.OffsetUnits = units; |
|
if (ctx->Driver.PolygonOffset) |
ctx->Driver.PolygonOffset( ctx, factor, units ); |
} |
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void GLAPIENTRY |
_mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
/* XXX mult by DepthMaxF here??? */ |
_mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF ); |
} |
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/**********************************************************************/ |
/** \name Initialization */ |
/*@{*/ |
|
/** |
* Initialize the context polygon state. |
* |
* \param ctx GL context. |
* |
* Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple |
* attribute groups. |
*/ |
void _mesa_init_polygon( struct gl_context * ctx ) |
{ |
/* Polygon group */ |
ctx->Polygon.CullFlag = GL_FALSE; |
ctx->Polygon.CullFaceMode = GL_BACK; |
ctx->Polygon.FrontFace = GL_CCW; |
ctx->Polygon._FrontBit = 0; |
ctx->Polygon.FrontMode = GL_FILL; |
ctx->Polygon.BackMode = GL_FILL; |
ctx->Polygon.SmoothFlag = GL_FALSE; |
ctx->Polygon.StippleFlag = GL_FALSE; |
ctx->Polygon.OffsetFactor = 0.0F; |
ctx->Polygon.OffsetUnits = 0.0F; |
ctx->Polygon.OffsetPoint = GL_FALSE; |
ctx->Polygon.OffsetLine = GL_FALSE; |
ctx->Polygon.OffsetFill = GL_FALSE; |
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/* Polygon Stipple group */ |
memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) ); |
} |
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/*@}*/ |