/** * \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 <= 0.0) { _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] != 1.0 || ctx->Point.Params[1] != 0.0 || ctx->Point.Params[2] != 0.0); 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) { 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; /* 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 */ for (i = 0; i < Elements(ctx->Point.CoordReplace); i++) { ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */ } }