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| <TITLE>Performance Tips</TITLE> |
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| <H1>Performance Tips</H1> |
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| <p> |
| Performance tips for software rendering: |
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| <ol> |
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| <li> Turn off smooth shading when you don't need it (glShadeModel) |
| <li> Turn off depth buffering when you don't need it. |
| <li> Turn off dithering when not needed. |
| <li> Use double buffering as it's often faster than single buffering |
| <li> Compile in the X Shared Memory extension option if it's supported |
| on your system by adding -DSHM to CFLAGS and -lXext to XLIBS for |
| your system in the Make-config file. |
| <li> Recompile Mesa with more optimization if possible. |
| <li> Try to maximize the amount of drawing done between glBegin/glEnd pairs. |
| <li> Use the MESA_BACK_BUFFER variable to find best performance in double |
| buffered mode. (X users only) |
| <li> Optimized polygon rasterizers are employed when: |
| rendering into back buffer which is an XImage |
| RGB mode, not grayscale, not monochrome |
| depth buffering is GL_LESS, or disabled |
| flat or smooth shading |
| dithered or non-dithered |
| no other rasterization operations enabled (blending, stencil, etc) |
| <li> Optimized line drawing is employed when: |
| rendering into back buffer which is an XImage |
| RGB mode, not grayscale, not monochrome |
| depth buffering is GL_LESS or disabled |
| flat shading |
| dithered or non-dithered |
| no other rasterization operations enabled (blending, stencil, etc) |
| <li> Textured polygons are fastest when: |
| using a 3-component (RGB), 2-D texture |
| minification and magnification filters are GL_NEAREST |
| texture coordinate wrap modes for S and T are GL_REPEAT |
| GL_DECAL environment mode |
| glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST ) |
| depth buffering is GL_LESS or disabled |
| <li> Lighting is fastest when: |
| Two-sided lighting is disabled |
| GL_LIGHT_MODEL_LOCAL_VIEWER is false |
| GL_COLOR_MATERIAL is disabled |
| No spot lights are used (all GL_SPOT_CUTOFFs are 180.0) |
| No local lights are used (all position W's are 0.0) |
| All material and light coefficients are >= zero |
| <li> XFree86 users: if you want to use 24-bit color try starting your |
| X server in 32-bit per pixel mode for better performance. That is, |
| start your X server with |
| startx -- -bpp 32 |
| instead of |
| startx -- -bpp 24 |
| <li> Try disabling dithering with the MESA_NO_DITHER environment variable. |
| If this env var is defined Mesa will disable dithering and the |
| command glEnable(GL_DITHER) will be ignored. |
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