1 /* 2 Copyright (C) Intel Corp. 2006. All Rights Reserved. 3 Intel funded Tungsten Graphics to 4 develop this 3D driver. 5 6 Permission is hereby granted, free of charge, to any person obtaining 7 a copy of this software and associated documentation files (the 8 "Software"), to deal in the Software without restriction, including 9 without limitation the rights to use, copy, modify, merge, publish, 10 distribute, sublicense, and/or sell copies of the Software, and to 11 permit persons to whom the Software is furnished to do so, subject to 12 the following conditions: 13 14 The above copyright notice and this permission notice (including the 15 next paragraph) shall be included in all copies or substantial 16 portions of the Software. 17 18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 26 **********************************************************************/ 27 /* 28 * Authors: 29 * Keith Whitwell <keithw (at) vmware.com> 30 */ 31 32 33 #ifndef BRW_UTIL_H 34 #define BRW_UTIL_H 35 36 #include "brw_context.h" 37 #include "main/framebuffer.h" 38 39 extern GLuint brw_translate_blend_factor( GLenum factor ); 40 extern GLuint brw_translate_blend_equation( GLenum mode ); 41 42 static inline float 43 brw_get_line_width(struct brw_context *brw) 44 { 45 /* From the OpenGL 4.4 spec: 46 * 47 * "The actual width of non-antialiased lines is determined by rounding 48 * the supplied width to the nearest integer, then clamping it to the 49 * implementation-dependent maximum non-antialiased line width." 50 */ 51 float line_width = 52 CLAMP(!_mesa_is_multisample_enabled(&brw->ctx) && !brw->ctx.Line.SmoothFlag 53 ? roundf(brw->ctx.Line.Width) : brw->ctx.Line.Width, 54 0.125f, brw->ctx.Const.MaxLineWidth); 55 56 if (!_mesa_is_multisample_enabled(&brw->ctx) && brw->ctx.Line.SmoothFlag && line_width < 1.5f) { 57 /* For 1 pixel line thickness or less, the general 58 * anti-aliasing algorithm gives up, and a garbage line is 59 * generated. Setting a Line Width of 0.0 specifies the 60 * rasterization of the "thinnest" (one-pixel-wide), 61 * non-antialiased lines. 62 * 63 * Lines rendered with zero Line Width are rasterized using 64 * Grid Intersection Quantization rules as specified by 65 * bspec section 6.3.12.1 Zero-Width (Cosmetic) Line 66 * Rasterization. 67 */ 68 line_width = 0.0f; 69 } 70 71 return line_width; 72 } 73 74 #endif 75
