/**
* \file points.c
* Point operations.
*/
/*
* 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 "context.h"
#include "macros.h"
#include "points.h"
#include "mtypes.h"
/**
* Set current point size.
* \param size point diameter in pixels
* \sa glPointSize().
*/
void GLAPIENTRY
_mesa_PointSize( GLfloat size )
{
GET_CURRENT_CONTEXT(ctx);
if (size <= 0.0F) {
_mesa_error( ctx, GL_INVALID_VALUE, "glPointSize" );
return;
}
if (ctx->Point.Size == size)
return;
FLUSH_VERTICES(ctx, _NEW_POINT);
ctx->Point.Size = size;
if (ctx->Driver.PointSize)
ctx->Driver.PointSize(ctx, size);
}
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);
}
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);
}
void GLAPIENTRY
_mesa_PointParameterf( GLenum pname, GLfloat param)
{
GLfloat p[3];
p[0] = param;
p[1] = p[2] = 0.0F;
_mesa_PointParameterfv(pname, p);
}
void GLAPIENTRY
_mesa_PointParameterfv( GLenum pname, const GLfloat *params)
{
GET_CURRENT_CONTEXT(ctx);
/* Drivers that support point sprites must also support point parameters.
* If point parameters aren't supported, then this function shouldn't even
* exist.
*/
assert(!(ctx->Extensions.ARB_point_sprite
|| ctx->Extensions.NV_point_sprite)
|| ctx->Extensions.EXT_point_parameters);
if (!ctx->Extensions.EXT_point_parameters) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"unsupported function called (unsupported extension)");
return;
}
switch (pname) {
case GL_DISTANCE_ATTENUATION_EXT:
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] != 1.0F ||
ctx->Point.Params[1] != 0.0F ||
ctx->Point.Params[2] != 0.0F);
break;
case GL_POINT_SIZE_MIN_EXT:
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];
break;
case GL_POINT_SIZE_MAX_EXT:
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];
break;
case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
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];
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 (_mesa_is_desktop_gl(ctx) && 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:
/* GL_POINT_SPRITE_COORD_ORIGIN was added to point sprites when the
* extension was merged into OpenGL 2.0.
*/
if ((ctx->API == API_OPENGL_COMPAT && ctx->Version >= 20)
|| ctx->API == API_OPENGL_CORE) {
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);
}
/**
* 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)
{
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;
/* Page 403 (page 423 of the PDF) of the OpenGL 3.0 spec says:
*
* "Non-sprite points (section 3.4) - Enable/Disable targets
* POINT_SMOOTH and POINT_SPRITE, and all associated state. Point
* rasterization is always performed as though POINT_SPRITE were
* enabled."
*
* In a core context, the state will default to true, and the setters and
* getters are disabled.
*/
ctx->Point.PointSprite = (ctx->API == API_OPENGL_CORE ||
ctx->API == API_OPENGLES2);
ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
ctx->Point.CoordReplace = 0; /* GL_ARB/NV_point_sprite */
}