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262 lines
8.1 KiB
C
262 lines
8.1 KiB
C
/**
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* \file points.c
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* Point operations.
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*/
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/*
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* Mesa 3-D graphics library
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* Version: 7.1
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*
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* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <precomp.h>
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/**
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* Set current point size.
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* \param size point diameter in pixels
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* \sa glPointSize().
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*/
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void GLAPIENTRY
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_mesa_PointSize( GLfloat size )
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{
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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if (size <= 0.0) {
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_mesa_error( ctx, GL_INVALID_VALUE, "glPointSize" );
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return;
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}
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if (ctx->Point.Size == size)
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return;
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FLUSH_VERTICES(ctx, _NEW_POINT);
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ctx->Point.Size = size;
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if (ctx->Driver.PointSize)
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ctx->Driver.PointSize(ctx, size);
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}
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#if _HAVE_FULL_GL
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void GLAPIENTRY
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_mesa_PointParameteri( GLenum pname, GLint param )
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{
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GLfloat p[3];
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p[0] = (GLfloat) param;
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p[1] = p[2] = 0.0F;
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_mesa_PointParameterfv(pname, p);
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}
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void GLAPIENTRY
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_mesa_PointParameteriv( GLenum pname, const GLint *params )
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{
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GLfloat p[3];
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p[0] = (GLfloat) params[0];
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if (pname == GL_DISTANCE_ATTENUATION_EXT) {
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p[1] = (GLfloat) params[1];
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p[2] = (GLfloat) params[2];
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}
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_mesa_PointParameterfv(pname, p);
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}
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void GLAPIENTRY
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_mesa_PointParameterf( GLenum pname, GLfloat param)
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{
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GLfloat p[3];
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p[0] = param;
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p[1] = p[2] = 0.0F;
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_mesa_PointParameterfv(pname, p);
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}
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void GLAPIENTRY
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_mesa_PointParameterfv( GLenum pname, const GLfloat *params)
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{
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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switch (pname) {
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case GL_DISTANCE_ATTENUATION_EXT:
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if (ctx->Extensions.EXT_point_parameters) {
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if (TEST_EQ_3V(ctx->Point.Params, params))
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return;
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FLUSH_VERTICES(ctx, _NEW_POINT);
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COPY_3V(ctx->Point.Params, params);
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ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
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ctx->Point.Params[1] != 0.0 ||
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ctx->Point.Params[2] != 0.0);
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if (ctx->Point._Attenuated)
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ctx->_TriangleCaps |= DD_POINT_ATTEN;
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else
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ctx->_TriangleCaps &= ~DD_POINT_ATTEN;
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}
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else {
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_mesa_error(ctx, GL_INVALID_ENUM,
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"glPointParameterf[v]{EXT,ARB}(pname)");
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return;
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}
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break;
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case GL_POINT_SIZE_MIN_EXT:
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if (ctx->Extensions.EXT_point_parameters) {
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if (params[0] < 0.0F) {
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_mesa_error( ctx, GL_INVALID_VALUE,
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"glPointParameterf[v]{EXT,ARB}(param)" );
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return;
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}
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if (ctx->Point.MinSize == params[0])
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return;
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FLUSH_VERTICES(ctx, _NEW_POINT);
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ctx->Point.MinSize = params[0];
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}
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else {
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_mesa_error(ctx, GL_INVALID_ENUM,
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"glPointParameterf[v]{EXT,ARB}(pname)");
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return;
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}
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break;
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case GL_POINT_SIZE_MAX_EXT:
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if (ctx->Extensions.EXT_point_parameters) {
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if (params[0] < 0.0F) {
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_mesa_error( ctx, GL_INVALID_VALUE,
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"glPointParameterf[v]{EXT,ARB}(param)" );
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return;
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}
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if (ctx->Point.MaxSize == params[0])
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return;
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FLUSH_VERTICES(ctx, _NEW_POINT);
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ctx->Point.MaxSize = params[0];
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}
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else {
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_mesa_error(ctx, GL_INVALID_ENUM,
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"glPointParameterf[v]{EXT,ARB}(pname)");
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return;
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}
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break;
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case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
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if (ctx->Extensions.EXT_point_parameters) {
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if (params[0] < 0.0F) {
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_mesa_error( ctx, GL_INVALID_VALUE,
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"glPointParameterf[v]{EXT,ARB}(param)" );
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return;
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}
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if (ctx->Point.Threshold == params[0])
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return;
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FLUSH_VERTICES(ctx, _NEW_POINT);
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ctx->Point.Threshold = params[0];
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}
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else {
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_mesa_error(ctx, GL_INVALID_ENUM,
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"glPointParameterf[v]{EXT,ARB}(pname)");
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return;
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}
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break;
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case GL_POINT_SPRITE_R_MODE_NV:
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/* This is one area where ARB_point_sprite and NV_point_sprite
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* differ. In ARB_point_sprite the POINT_SPRITE_R_MODE is
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* always ZERO. NV_point_sprite adds the S and R modes.
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*/
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if (ctx->Extensions.NV_point_sprite) {
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GLenum value = (GLenum) params[0];
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if (value != GL_ZERO && value != GL_S && value != GL_R) {
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_mesa_error(ctx, GL_INVALID_VALUE,
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"glPointParameterf[v]{EXT,ARB}(param)");
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return;
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}
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if (ctx->Point.SpriteRMode == value)
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return;
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FLUSH_VERTICES(ctx, _NEW_POINT);
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ctx->Point.SpriteRMode = value;
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}
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else {
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_mesa_error(ctx, GL_INVALID_ENUM,
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"glPointParameterf[v]{EXT,ARB}(pname)");
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return;
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}
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break;
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case GL_POINT_SPRITE_COORD_ORIGIN:
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/* This is not completely correct. GL_POINT_SPRITE_COORD_ORIGIN was
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* added to point sprites when the extension was merged into OpenGL
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* 2.0. It is expected that an implementation supporting OpenGL 1.4
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* and GL_ARB_point_sprite will generate an error here.
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*/
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if (ctx->Extensions.ARB_point_sprite) {
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GLenum value = (GLenum) params[0];
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if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
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_mesa_error(ctx, GL_INVALID_VALUE,
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"glPointParameterf[v]{EXT,ARB}(param)");
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return;
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}
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if (ctx->Point.SpriteOrigin == value)
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return;
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FLUSH_VERTICES(ctx, _NEW_POINT);
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ctx->Point.SpriteOrigin = value;
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}
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else {
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_mesa_error(ctx, GL_INVALID_ENUM,
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"glPointParameterf[v]{EXT,ARB}(pname)");
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return;
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}
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break;
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default:
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_mesa_error( ctx, GL_INVALID_ENUM,
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"glPointParameterf[v]{EXT,ARB}(pname)" );
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return;
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}
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if (ctx->Driver.PointParameterfv)
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(*ctx->Driver.PointParameterfv)(ctx, pname, params);
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}
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#endif
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/**
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* Initialize the context point state.
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*
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* \param ctx GL context.
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*
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* Initializes __struct gl_contextRec::Point and point related constants in
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* __struct gl_contextRec::Const.
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*/
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void
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_mesa_init_point(struct gl_context *ctx)
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{
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ctx->Point.SmoothFlag = GL_FALSE;
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ctx->Point.Size = 1.0;
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ctx->Point.Params[0] = 1.0;
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ctx->Point.Params[1] = 0.0;
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ctx->Point.Params[2] = 0.0;
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ctx->Point._Attenuated = GL_FALSE;
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ctx->Point.MinSize = 0.0;
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ctx->Point.MaxSize
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= MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
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ctx->Point.Threshold = 1.0;
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ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
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ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
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ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
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ctx->Point.CoordReplace = GL_FALSE; /* GL_ARB/NV_point_sprite */
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}
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