From 79aeafd3ca3680c28f6d47a21a501334844f4475 Mon Sep 17 00:00:00 2001 From: Kristian Høgsberg Date: Thu, 25 Feb 2010 16:12:58 -0500 Subject: Drop fb, ffb and gamma dri drivers --- src/mesa/drivers/dri/ffb/ffb_fog.c | 73 -------------------------------------- 1 file changed, 73 deletions(-) delete mode 100644 src/mesa/drivers/dri/ffb/ffb_fog.c (limited to 'src/mesa/drivers/dri/ffb/ffb_fog.c') diff --git a/src/mesa/drivers/dri/ffb/ffb_fog.c b/src/mesa/drivers/dri/ffb/ffb_fog.c deleted file mode 100644 index e6eca2390e..0000000000 --- a/src/mesa/drivers/dri/ffb/ffb_fog.c +++ /dev/null @@ -1,73 +0,0 @@ - -/* FFB fog support: - * - * There are two levels of support for FOG in the Creator3D series. - * Both involve a depth cue unit and 1 or 4 slope factors and scales - * for varying the pixel intensity. - * - * Chips prior to FFB2 only have a single set of such settings, FFB2 - * and later have 4 settings. - * - * The basic depth cueing equation is: - * - * C_final = dcsf(z) * C_orig + (1 - dcsf(z)) * C_fog - * - * C_final -- The final color passed to blend unit or frame - * buffer (if blending is disabled). - * - * C_orig -- The color we start with, which comes either from - * the raster processor or cpu writes to the smart - * framebuffer aperture. - * - * C_fog -- This is the "fog" color, ie. the desired color - * at the deepest Z. - * - * dcsf(z) -- The depth cue scale as a function of Z. - * - * With pre-FFB2 chips there are four parameters to control the depth - * cue scaling. Here is a diagram: - * - * 1.0 ------------- - * | | | | - * | | | | - * Sfront XXXXX---+---+ - * | |X | | - * dcsf(z) | | X | | - * | | X| | - * Sback +---+---XXXXX - * | | | | - * 0.0 ------------- - * 0.0 Zf Zb 1.0 - * - * z - * Therefore: - * - * for Zf < z < Zb - * - * dcsf(z) = Sback + ((Sfront - Sback) / (Zf - Zb)) * (Zb - z) - * - * for z <= Zf - * - * dcsf(z) = Sfront - * - * for z >= Zb - * - * dcsf(z) = Sback - * - * With FFB2 and later, 3 more slope regions are provided, the first of - * them starts at the end of the region defined above and ends at a - * specified depth value, the next slop region starts there and ends - * at the next specified depth value, and so on. Each of the 3 slope - * regions also have scale and slope settings of their own. - * - * The C_fog color is programmed into the alpha blending unit color1 - * and color2 registers as follows: - * - * color1: -(C_fog) - * color2: C_fog - bg - * - * If alpha blending is disabled, the bg factor is zero. Note that - * the alpha blending color registers specify each of the RGB values - * as 9 bit 1:8 signed numbers in the range -1.00 to 0.ff inclusive. - * (ie. 0x100 == -1.00 and 0x0ff == +0.ff) - */ -- cgit v1.2.3