1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2 <html lang="en"> 3 <head> 4 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 5 <title>Performance Tips</title> 6 <link rel="stylesheet" type="text/css" href="mesa.css"> 7 </head> 8 <body> 9 10 <div class="header"> 11 <h1>The Mesa 3D Graphics Library</h1> 12 </div> 13 14 <iframe src="contents.html"></iframe> 15 <div class="content"> 16 17 <h1>Performance Tips</h1> 18 19 <p> 20 Performance tips for software rendering: 21 </p> 22 <ol> 23 24 <li> Turn off smooth shading when you don't need it (glShadeModel) 25 <li> Turn off depth buffering when you don't need it. 26 <li> Turn off dithering when not needed. 27 <li> Use double buffering as it's often faster than single buffering 28 <li> Compile in the X Shared Memory extension option if it's supported 29 on your system by adding -DSHM to CFLAGS and -lXext to XLIBS for 30 your system in the Make-config file. 31 <li> Recompile Mesa with more optimization if possible. 32 <li> Try to maximize the amount of drawing done between glBegin/glEnd pairs. 33 <li> Use the MESA_BACK_BUFFER variable to find best performance in double 34 buffered mode. (X users only) 35 <li> Optimized polygon rasterizers are employed when: 36 rendering into back buffer which is an XImage 37 RGB mode, not grayscale, not monochrome 38 depth buffering is GL_LESS, or disabled 39 flat or smooth shading 40 dithered or non-dithered 41 no other rasterization operations enabled (blending, stencil, etc) 42 <li> Optimized line drawing is employed when: 43 rendering into back buffer which is an XImage 44 RGB mode, not grayscale, not monochrome 45 depth buffering is GL_LESS or disabled 46 flat shading 47 dithered or non-dithered 48 no other rasterization operations enabled (blending, stencil, etc) 49 <li> Textured polygons are fastest when: 50 using a 3-component (RGB), 2-D texture 51 minification and magnification filters are GL_NEAREST 52 texture coordinate wrap modes for S and T are GL_REPEAT 53 GL_DECAL environment mode 54 glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST ) 55 depth buffering is GL_LESS or disabled 56 <li> Lighting is fastest when: 57 Two-sided lighting is disabled 58 GL_LIGHT_MODEL_LOCAL_VIEWER is false 59 GL_COLOR_MATERIAL is disabled 60 No spot lights are used (all GL_SPOT_CUTOFFs are 180.0) 61 No local lights are used (all position W's are 0.0) 62 All material and light coefficients are >= zero 63 <li> XFree86 users: if you want to use 24-bit color try starting your 64 X server in 32-bit per pixel mode for better performance. That is, 65 start your X server with 66 startx -- -bpp 32 67 instead of 68 startx -- -bpp 24 69 <li> Try disabling dithering with the MESA_NO_DITHER environment variable. 70 If this env var is defined Mesa will disable dithering and the 71 command glEnable(GL_DITHER) will be ignored. 72 </ol> 73 74 </div> 75 </body> 76 </html> 77
