From afaa53040bd01ca86762e7d7b1a5a65810767921 Mon Sep 17 00:00:00 2001 From: Robert Ellison Date: Fri, 3 Oct 2008 18:00:43 -0600 Subject: CELL: changes to generate SPU code for stenciling This set of code changes are for stencil code generation support. Both one-sided and two-sided stenciling are supported. In addition to the raw code generation changes, these changes had to be made elsewhere in the system: - Added new "register set" feature to the SPE assembly generation. A "register set" is a way to allocate multiple registers and free them all at the same time, delegating register allocation management to the spe_function unit. It's quite useful in complex register allocation schemes (like stenciling). - Added and improved SPE macro calculations. These are operations between registers and unsigned integer immediates. In many cases, the calculation can be performed with a single instruction; the macros will generate the single instruction if possible, or generate a register load and register-to-register operation if not. These macro functions are: spe_load_uint() (which has new ways to load a value in a single instruction), spe_and_uint(), spe_xor_uint(), spe_compare_equal_uint(), and spe_compare_greater_uint(). - Added facing to fragment generation. While rendering, the rasterizer needs to be able to determine front- and back-facing fragments, in order to correctly apply two-sided stencil. That requires these changes: - Added front_winding field to the cell_command_render block, so that the state tracker could communicate to the rasterizer what it considered to be the front-facing direction. - Added fragment facing as an input to the fragment function. - Calculated facing is passed during emit_quad(). --- src/gallium/drivers/cell/common.h | 1 + 1 file changed, 1 insertion(+) (limited to 'src/gallium/drivers/cell/common.h') diff --git a/src/gallium/drivers/cell/common.h b/src/gallium/drivers/cell/common.h index 99329fd8e22..c223bc17449 100644 --- a/src/gallium/drivers/cell/common.h +++ b/src/gallium/drivers/cell/common.h @@ -227,6 +227,7 @@ struct cell_command_render float xmin, ymin, xmax, ymax; /* XXX another dummy field */ uint min_index; boolean inline_verts; + uint front_winding; /* the rasterizer needs to be able to determine facing to apply front/back-facing stencil */ }; -- cgit v1.2.3