| /** |
| * \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 */ |
| } |
