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/** |
* \file points.c |
* Point operations. |
*/ |
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/* |
* Mesa 3-D graphics library |
* Version: 7.1 |
* |
* 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 |
* 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. |
*/ |
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#include "glheader.h" |
#include "context.h" |
#include "macros.h" |
#include "points.h" |
#include "mtypes.h" |
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/** |
* Set current point size. |
* \param size point diameter in pixels |
* \sa glPointSize(). |
*/ |
void GLAPIENTRY |
_mesa_PointSize( GLfloat size ) |
{ |
GET_CURRENT_CONTEXT(ctx); |
ASSERT_OUTSIDE_BEGIN_END(ctx); |
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if (size <= 0.0) { |
_mesa_error( ctx, GL_INVALID_VALUE, "glPointSize" ); |
return; |
} |
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if (ctx->Point.Size == size) |
return; |
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FLUSH_VERTICES(ctx, _NEW_POINT); |
ctx->Point.Size = size; |
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if (ctx->Driver.PointSize) |
ctx->Driver.PointSize(ctx, size); |
} |
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#if _HAVE_FULL_GL |
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void GLAPIENTRY |
_mesa_PointParameteri( GLenum pname, GLint param ) |
{ |
GLfloat p[3]; |
p[0] = (GLfloat) param; |
p[1] = p[2] = 0.0F; |
_mesa_PointParameterfv(pname, p); |
} |
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void GLAPIENTRY |
_mesa_PointParameteriv( GLenum pname, const GLint *params ) |
{ |
GLfloat p[3]; |
p[0] = (GLfloat) params[0]; |
if (pname == GL_DISTANCE_ATTENUATION_EXT) { |
p[1] = (GLfloat) params[1]; |
p[2] = (GLfloat) params[2]; |
} |
_mesa_PointParameterfv(pname, p); |
} |
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void GLAPIENTRY |
_mesa_PointParameterf( GLenum pname, GLfloat param) |
{ |
GLfloat p[3]; |
p[0] = param; |
p[1] = p[2] = 0.0F; |
_mesa_PointParameterfv(pname, p); |
} |
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void GLAPIENTRY |
_mesa_PointParameterfv( GLenum pname, const GLfloat *params) |
{ |
GET_CURRENT_CONTEXT(ctx); |
ASSERT_OUTSIDE_BEGIN_END(ctx); |
|
switch (pname) { |
case GL_DISTANCE_ATTENUATION_EXT: |
if (ctx->Extensions.EXT_point_parameters) { |
if (TEST_EQ_3V(ctx->Point.Params, params)) |
return; |
FLUSH_VERTICES(ctx, _NEW_POINT); |
COPY_3V(ctx->Point.Params, params); |
ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 || |
ctx->Point.Params[1] != 0.0 || |
ctx->Point.Params[2] != 0.0); |
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if (ctx->Point._Attenuated) |
ctx->_TriangleCaps |= DD_POINT_ATTEN; |
else |
ctx->_TriangleCaps &= ~DD_POINT_ATTEN; |
} |
else { |
_mesa_error(ctx, GL_INVALID_ENUM, |
"glPointParameterf[v]{EXT,ARB}(pname)"); |
return; |
} |
break; |
case GL_POINT_SIZE_MIN_EXT: |
if (ctx->Extensions.EXT_point_parameters) { |
if (params[0] < 0.0F) { |
_mesa_error( ctx, GL_INVALID_VALUE, |
"glPointParameterf[v]{EXT,ARB}(param)" ); |
return; |
} |
if (ctx->Point.MinSize == params[0]) |
return; |
FLUSH_VERTICES(ctx, _NEW_POINT); |
ctx->Point.MinSize = params[0]; |
} |
else { |
_mesa_error(ctx, GL_INVALID_ENUM, |
"glPointParameterf[v]{EXT,ARB}(pname)"); |
return; |
} |
break; |
case GL_POINT_SIZE_MAX_EXT: |
if (ctx->Extensions.EXT_point_parameters) { |
if (params[0] < 0.0F) { |
_mesa_error( ctx, GL_INVALID_VALUE, |
"glPointParameterf[v]{EXT,ARB}(param)" ); |
return; |
} |
if (ctx->Point.MaxSize == params[0]) |
return; |
FLUSH_VERTICES(ctx, _NEW_POINT); |
ctx->Point.MaxSize = params[0]; |
} |
else { |
_mesa_error(ctx, GL_INVALID_ENUM, |
"glPointParameterf[v]{EXT,ARB}(pname)"); |
return; |
} |
break; |
case GL_POINT_FADE_THRESHOLD_SIZE_EXT: |
if (ctx->Extensions.EXT_point_parameters) { |
if (params[0] < 0.0F) { |
_mesa_error( ctx, GL_INVALID_VALUE, |
"glPointParameterf[v]{EXT,ARB}(param)" ); |
return; |
} |
if (ctx->Point.Threshold == params[0]) |
return; |
FLUSH_VERTICES(ctx, _NEW_POINT); |
ctx->Point.Threshold = params[0]; |
} |
else { |
_mesa_error(ctx, GL_INVALID_ENUM, |
"glPointParameterf[v]{EXT,ARB}(pname)"); |
return; |
} |
break; |
case GL_POINT_SPRITE_R_MODE_NV: |
/* This is one area where ARB_point_sprite and NV_point_sprite |
* differ. In ARB_point_sprite the POINT_SPRITE_R_MODE is |
* always ZERO. NV_point_sprite adds the S and R modes. |
*/ |
if (ctx->Extensions.NV_point_sprite) { |
GLenum value = (GLenum) params[0]; |
if (value != GL_ZERO && value != GL_S && value != GL_R) { |
_mesa_error(ctx, GL_INVALID_VALUE, |
"glPointParameterf[v]{EXT,ARB}(param)"); |
return; |
} |
if (ctx->Point.SpriteRMode == value) |
return; |
FLUSH_VERTICES(ctx, _NEW_POINT); |
ctx->Point.SpriteRMode = value; |
} |
else { |
_mesa_error(ctx, GL_INVALID_ENUM, |
"glPointParameterf[v]{EXT,ARB}(pname)"); |
return; |
} |
break; |
case GL_POINT_SPRITE_COORD_ORIGIN: |
/* This is not completely correct. GL_POINT_SPRITE_COORD_ORIGIN was |
* added to point sprites when the extension was merged into OpenGL |
* 2.0. It is expected that an implementation supporting OpenGL 1.4 |
* and GL_ARB_point_sprite will generate an error here. |
*/ |
if (ctx->Extensions.ARB_point_sprite) { |
GLenum value = (GLenum) params[0]; |
if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) { |
_mesa_error(ctx, GL_INVALID_VALUE, |
"glPointParameterf[v]{EXT,ARB}(param)"); |
return; |
} |
if (ctx->Point.SpriteOrigin == value) |
return; |
FLUSH_VERTICES(ctx, _NEW_POINT); |
ctx->Point.SpriteOrigin = value; |
} |
else { |
_mesa_error(ctx, GL_INVALID_ENUM, |
"glPointParameterf[v]{EXT,ARB}(pname)"); |
return; |
} |
break; |
default: |
_mesa_error( ctx, GL_INVALID_ENUM, |
"glPointParameterf[v]{EXT,ARB}(pname)" ); |
return; |
} |
|
if (ctx->Driver.PointParameterfv) |
(*ctx->Driver.PointParameterfv)(ctx, pname, params); |
} |
#endif |
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/** |
* Initialize the context point state. |
* |
* \param ctx GL context. |
* |
* Initializes __struct gl_contextRec::Point and point related constants in |
* __struct gl_contextRec::Const. |
*/ |
void |
_mesa_init_point(struct gl_context *ctx) |
{ |
GLuint i; |
|
ctx->Point.SmoothFlag = GL_FALSE; |
ctx->Point.Size = 1.0; |
ctx->Point.Params[0] = 1.0; |
ctx->Point.Params[1] = 0.0; |
ctx->Point.Params[2] = 0.0; |
ctx->Point._Attenuated = GL_FALSE; |
ctx->Point.MinSize = 0.0; |
ctx->Point.MaxSize |
= MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA); |
ctx->Point.Threshold = 1.0; |
ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */ |
ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */ |
ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */ |
for (i = 0; i < Elements(ctx->Point.CoordReplace); i++) { |
ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */ |
} |
} |