| /* |
| Copyright (C) Intel Corp. 2006. All Rights Reserved. |
| Intel funded Tungsten Graphics to |
| develop this 3D driver. |
| |
| 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 (including the |
| next paragraph) 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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. |
| |
| **********************************************************************/ |
| /* |
| * Authors: |
| * Keith Whitwell <keithw@vmware.com> |
| */ |
| |
| |
| #ifndef BRW_UTIL_H |
| #define BRW_UTIL_H |
| |
| #include "brw_context.h" |
| #include "main/framebuffer.h" |
| |
| extern GLuint brw_translate_blend_factor( GLenum factor ); |
| extern GLuint brw_translate_blend_equation( GLenum mode ); |
| extern GLenum brw_fix_xRGB_alpha(GLenum function); |
| |
| static inline uint32_t |
| brw_get_line_width(struct brw_context *brw) |
| { |
| /* From the OpenGL 4.4 spec: |
| * |
| * "The actual width of non-antialiased lines is determined by rounding |
| * the supplied width to the nearest integer, then clamping it to the |
| * implementation-dependent maximum non-antialiased line width." |
| */ |
| float line_width = |
| CLAMP(!_mesa_is_multisample_enabled(&brw->ctx) && !brw->ctx.Line.SmoothFlag |
| ? roundf(brw->ctx.Line.Width) : brw->ctx.Line.Width, |
| 0.0f, brw->ctx.Const.MaxLineWidth); |
| uint32_t line_width_u3_7 = U_FIXED(line_width, 7); |
| |
| /* Line width of 0 is not allowed when MSAA enabled */ |
| if (_mesa_is_multisample_enabled(&brw->ctx)) { |
| if (line_width_u3_7 == 0) |
| line_width_u3_7 = 1; |
| } else if (brw->ctx.Line.SmoothFlag && line_width < 1.5f) { |
| /* For 1 pixel line thickness or less, the general |
| * anti-aliasing algorithm gives up, and a garbage line is |
| * generated. Setting a Line Width of 0.0 specifies the |
| * rasterization of the "thinnest" (one-pixel-wide), |
| * non-antialiased lines. |
| * |
| * Lines rendered with zero Line Width are rasterized using |
| * Grid Intersection Quantization rules as specified by |
| * bspec section 6.3.12.1 Zero-Width (Cosmetic) Line |
| * Rasterization. |
| */ |
| line_width_u3_7 = 0; |
| } |
| |
| return line_width_u3_7; |
| } |
| |
| #endif |