diff options
Diffstat (limited to 'src/gallium')
| -rw-r--r-- | src/gallium/drivers/cell/ppu/cell_gen_fragment.c | 161 |
1 files changed, 78 insertions, 83 deletions
diff --git a/src/gallium/drivers/cell/ppu/cell_gen_fragment.c b/src/gallium/drivers/cell/ppu/cell_gen_fragment.c index 1837b4c79bd..3b166e446d6 100644 --- a/src/gallium/drivers/cell/ppu/cell_gen_fragment.c +++ b/src/gallium/drivers/cell/ppu/cell_gen_fragment.c @@ -971,87 +971,6 @@ gen_logicop(const struct pipe_blend_state *blend, } -static void -gen_colormask(uint colormask, - struct spe_function *f, - int fragRGBA_reg, int fbRGBA_reg) -{ - /* We've got four 32-bit RGBA packed pixels in each of - * fragRGBA_reg and fbRGBA_reg, not sets of floating-point - * reds, greens, blues, and alphas. - * */ - - /* The color mask operation can prevent any set of color - * components in the incoming fragment from being written to the frame - * buffer; we do this by replacing the masked components of the - * fragment with the frame buffer values. - * - * There are only 16 possibilities, with a unique mask for - * each of the possibilities. (Technically, there are only 15 - * possibilities, since we shouldn't be called for the one mask - * that does nothing, but the complete implementation is here - * anyway to avoid confusion.) - * - * We implement this via a constant static array which we'll index - * into to get the correct mask. - * - * We're dependent on the mask values being low-order bits, - * with particular values for each bit; so we start with a - * few assertions, which will fail if any of the values were - * to change. - */ - ASSERT(PIPE_MASK_R == 0x1); - ASSERT(PIPE_MASK_G == 0x2); - ASSERT(PIPE_MASK_B == 0x4); - ASSERT(PIPE_MASK_A == 0x8); - - /* Here's the list of all possible colormasks, indexed by the - * value of the combined mask specifier. - */ - static const unsigned int colormasks[16] = { - 0x00000000, /* 0: all colors masked */ - 0xff000000, /* 1: PIPE_MASK_R */ - 0x00ff0000, /* 2: PIPE_MASK_G */ - 0xffff0000, /* 3: PIPE_MASK_R | PIPE_MASK_G */ - 0x0000ff00, /* 4: PIPE_MASK_B */ - 0xff00ff00, /* 5: PIPE_MASK_R | PIPE_MASK_B */ - 0x00ffff00, /* 6: PIPE_MASK_G | PIPE_MASK_B */ - 0xffffff00, /* 7: PIPE_MASK_R | PIPE_MASK_G | PIPE_MASK_B */ - 0x000000ff, /* 8: PIPE_MASK_A */ - 0xff0000ff, /* 9: PIPE_MASK_R | PIPE_MASK_A */ - 0x00ff00ff, /* 10: PIPE_MASK_G | PIPE_MASK_A */ - 0xffff00ff, /* 11: PIPE_MASK_R | PIPE_MASK_G | PIPE_MASK_A */ - 0x0000ffff, /* 12: PIPE_MASK_B | PIPE_MASK_A */ - 0xff00ffff, /* 13: PIPE_MASK_R | PIPE_MASK_B | PIPE_MASK_A */ - 0x00ffffff, /* 14: PIPE_MASK_G | PIPE_MASK_B | PIPE_MASK_A */ - 0xffffffff /* 15: PIPE_MASK_R | PIPE_MASK_G | PIPE_MASK_B | PIPE_MASK_A */ - }; - - /* Get a temporary register to hold the mask */ - int colormask_reg = spe_allocate_available_register(f); - - /* Look up the desired mask directly and load it into the mask register. - * This will load the same mask into each of the four words in the - * mask register. - */ - spe_load_uint(f, colormask_reg, colormasks[colormask]); - - /* Use the mask register to select between the fragment color - * values and the frame buffer color values. Wherever the - * mask has a 0 bit, the current frame buffer color should override - * the fragment color. Wherever the mask has a 1 bit, the - * fragment color should persevere. The Select Bits (selb rt, rA, rB, rM) - * instruction will select bits from its first operand rA wherever the - * the mask bits rM are 0, and from its second operand rB wherever the - * mask bits rM are 1. That means that the frame buffer color is the - * first operand, and the fragment color the second. - */ - spe_selb(f, fragRGBA_reg, fbRGBA_reg, fragRGBA_reg, colormask_reg); - - /* Release the temporary register and we're done */ - spe_release_register(f, colormask_reg); -} - /** * Generate code to pack a quad of float colors into four 32-bit integers. * @@ -1118,8 +1037,85 @@ gen_pack_colors(struct spe_function *f, spe_release_register(f, ba_reg); } +static void +gen_colormask(struct spe_function *f, + uint colormask, + enum pipe_format color_format, + int fragRGBA_reg, int fbRGBA_reg) +{ + /* We've got four 32-bit RGBA packed pixels in each of + * fragRGBA_reg and fbRGBA_reg, not sets of floating-point + * reds, greens, blues, and alphas. Further, the pixels + * are packed according to the given color format, not + * necessarily RGBA... + */ + unsigned int r_mask; + unsigned int g_mask; + unsigned int b_mask; + unsigned int a_mask; + + /* Calculate exactly where the bits for any particular color + * end up, so we can mask them correctly. + */ + switch(color_format) { + case PIPE_FORMAT_A8R8G8B8_UNORM: + /* ARGB */ + a_mask = 0xff000000; + r_mask = 0x00ff0000; + g_mask = 0x0000ff00; + b_mask = 0x000000ff; + break; + case PIPE_FORMAT_B8G8R8A8_UNORM: + /* BGRA */ + b_mask = 0xff000000; + g_mask = 0x00ff0000; + r_mask = 0x0000ff00; + a_mask = 0x000000ff; + break; + default: + ASSERT(0); + } + /* For each R, G, B, and A component we're supposed to mask out, + * clear its bits. Then our mask operation later will work + * as expected. + */ + if (!(colormask & PIPE_MASK_R)) { + r_mask = 0; + } + if (!(colormask & PIPE_MASK_G)) { + g_mask = 0; + } + if (!(colormask & PIPE_MASK_B)) { + b_mask = 0; + } + if (!(colormask & PIPE_MASK_A)) { + a_mask = 0; + } + + /* Get a temporary register to hold the mask that will be applied to the fragment */ + int colormask_reg = spe_allocate_available_register(f); + /* The actual mask we're going to use is an OR of the remaining R, G, B, and A + * masks. Load the result value into our temporary register. + */ + spe_load_uint(f, colormask_reg, r_mask | g_mask | b_mask | a_mask); + + /* Use the mask register to select between the fragment color + * values and the frame buffer color values. Wherever the + * mask has a 0 bit, the current frame buffer color should override + * the fragment color. Wherever the mask has a 1 bit, the + * fragment color should persevere. The Select Bits (selb rt, rA, rB, rM) + * instruction will select bits from its first operand rA wherever the + * the mask bits rM are 0, and from its second operand rB wherever the + * mask bits rM are 1. That means that the frame buffer color is the + * first operand, and the fragment color the second. + */ + spe_selb(f, fragRGBA_reg, fbRGBA_reg, fragRGBA_reg, colormask_reg); + + /* Release the temporary register and we're done */ + spe_release_register(f, colormask_reg); +} /** * Generate SPE code to implement the fragment operations (alpha test, @@ -1383,7 +1379,7 @@ cell_gen_fragment_function(struct cell_context *cell, struct spe_function *f) } if (blend->colormask != PIPE_MASK_RGBA) { - gen_colormask(blend->colormask, f, rgba_reg, fbRGBA_reg); + gen_colormask(f, blend->colormask, color_format, rgba_reg, fbRGBA_reg); } @@ -1407,7 +1403,6 @@ cell_gen_fragment_function(struct cell_context *cell, struct spe_function *f) spe_bi(f, SPE_REG_RA, 0, 0); /* return from function call */ - spe_release_register(f, fbRGBA_reg); spe_release_register(f, fbZS_reg); spe_release_register(f, quad_offset_reg); |