From 683ef52e19576f6e1263bc7d25fc9475c519eade Mon Sep 17 00:00:00 2001 From: Marek Olšák Date: Tue, 10 Aug 2010 14:21:05 +0200 Subject: r300g: implement gl_FrontFacing --- src/gallium/drivers/r300/r300_state_derived.c | 43 +++++++++++++++++++++++---- 1 file changed, 37 insertions(+), 6 deletions(-) (limited to 'src/gallium/drivers/r300/r300_state_derived.c') diff --git a/src/gallium/drivers/r300/r300_state_derived.c b/src/gallium/drivers/r300/r300_state_derived.c index 1f36e7758f..39000477cb 100644 --- a/src/gallium/drivers/r300/r300_state_derived.c +++ b/src/gallium/drivers/r300/r300_state_derived.c @@ -46,6 +46,11 @@ enum r300_rs_swizzle { SWIZ_0001, }; +enum r300_rs_col_write_type { + WRITE_COLOR = 0, + WRITE_FACE +}; + static void r300_draw_emit_attrib(struct r300_context* r300, enum attrib_emit emit, enum interp_mode interp, @@ -203,8 +208,10 @@ static void r300_rs_col(struct r300_rs_block* rs, int id, int ptr, rs->inst[id] |= R300_RS_INST_COL_ID(id); } -static void r300_rs_col_write(struct r300_rs_block* rs, int id, int fp_offset) +static void r300_rs_col_write(struct r300_rs_block* rs, int id, int fp_offset, + enum r300_rs_col_write_type type) { + assert(type != WRITE_COLOR); rs->inst[id] |= R300_RS_INST_COL_CN_WRITE | R300_RS_INST_COL_ADDR(fp_offset); } @@ -252,10 +259,16 @@ static void r500_rs_col(struct r300_rs_block* rs, int id, int ptr, rs->inst[id] |= R500_RS_INST_COL_ID(id); } -static void r500_rs_col_write(struct r300_rs_block* rs, int id, int fp_offset) +static void r500_rs_col_write(struct r300_rs_block* rs, int id, int fp_offset, + enum r300_rs_col_write_type type) { - rs->inst[id] |= R500_RS_INST_COL_CN_WRITE | - R500_RS_INST_COL_ADDR(fp_offset); + if (type == WRITE_FACE) + rs->inst[id] |= R500_RS_INST_COL_CN_WRITE_BACKFACE | + R500_RS_INST_COL_ADDR(fp_offset); + else + rs->inst[id] |= R500_RS_INST_COL_CN_WRITE | + R500_RS_INST_COL_ADDR(fp_offset); + } static void r500_rs_tex(struct r300_rs_block* rs, int id, int ptr, @@ -305,7 +318,7 @@ static void r300_update_rs_block(struct r300_context *r300) struct r300_rs_block rs = {0}; int i, col_count = 0, tex_count = 0, fp_offset = 0, count, loc = 0, tex_ptr = 0; void (*rX00_rs_col)(struct r300_rs_block*, int, int, enum r300_rs_swizzle); - void (*rX00_rs_col_write)(struct r300_rs_block*, int, int); + void (*rX00_rs_col_write)(struct r300_rs_block*, int, int, enum r300_rs_col_write_type); void (*rX00_rs_tex)(struct r300_rs_block*, int, int, enum r300_rs_swizzle); void (*rX00_rs_tex_write)(struct r300_rs_block*, int, int); boolean any_bcolor_used = vs_outputs->bcolor[0] != ATTR_UNUSED || @@ -350,7 +363,7 @@ static void r300_update_rs_block(struct r300_context *r300) /* Write it to the FS input register if it's needed by the FS. */ if (fs_inputs->color[i] != ATTR_UNUSED) { - rX00_rs_col_write(&rs, col_count, fp_offset); + rX00_rs_col_write(&rs, col_count, fp_offset, WRITE_COLOR); fp_offset++; DBG(r300, DBG_RS, @@ -398,6 +411,24 @@ static void r300_update_rs_block(struct r300_context *r300) } } + /* gl_FrontFacing. + * Note that we can use either the two-sided color selection based on + * the front and back vertex shader colors, or gl_FrontFacing, + * but not both! It locks up otherwise. + * + * In Direct3D 9, the two-sided color selection can be used + * with shaders 2.0 only, while gl_FrontFacing can be used + * with shaders 3.0 only. The hardware apparently hasn't been designed + * to support both at the same time. */ + if (r300->screen->caps.is_r500 && fs_inputs->face != ATTR_UNUSED && + !(any_bcolor_used && r300->two_sided_color)) { + rX00_rs_col(&rs, col_count, col_count, SWIZ_XYZW); + rX00_rs_col_write(&rs, col_count, fp_offset, WRITE_FACE); + fp_offset++; + col_count++; + DBG(r300, DBG_RS, "r300: Rasterized FACE written to FS.\n"); + } + /* Rasterize texture coordinates. */ for (i = 0; i < ATTR_GENERIC_COUNT && tex_count < 8; i++) { bool sprite_coord = !!(r300->sprite_coord_enable & (1 << i)); -- cgit v1.2.3