sp_quad_earlyz.c File Reference

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Functions
static void	earlyz_quad (struct quad_stage *qs, struct quad_header *quad)
	Quad early-z testing.
static void	earlyz_begin (struct quad_stage *qs)
static void	earlyz_destroy (struct quad_stage *qs)
struct quad_stage *	sp_quad_earlyz_stage (struct softpipe_context *softpipe)

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Function Documentation

static void earlyz_begin

(

struct quad_stage *

qs

)

[static]

Definition at line 63 of file sp_quad_earlyz.c.

References quad_stage::begin, and quad_stage::next.

{
   qs->next->begin( qs->next );
}

static void earlyz_destroy

(

struct quad_stage *

qs

)

[static]

Definition at line 70 of file sp_quad_earlyz.c.

References FREE.

{
   FREE( qs );
}

static void earlyz_quad	(	struct quad_stage *	qs,
		struct quad_header *	quad
	)			[static]

Quad early-z testing.

All this stage does is compute the quad's Z values (which is normally done by the shading stage). The next stage will do the actual depth test.

Definition at line 44 of file sp_quad_earlyz.c.

References tgsi_interp_coef::a0, tgsi_interp_coef::dadx, tgsi_interp_coef::dady, quad_header_output::depth, quad_header::input, quad_stage::next, quad_header::output, quad_header::posCoef, quad_stage::run, quad_header_input::x0, and quad_header_input::y0.

{
   const float fx = (float) quad->input.x0;
   const float fy = (float) quad->input.y0;
   const float dzdx = quad->posCoef->dadx[2];
   const float dzdy = quad->posCoef->dady[2];
   const float z0 = quad->posCoef->a0[2] + dzdx * fx + dzdy * fy;

   quad->output.depth[0] = z0;
   quad->output.depth[1] = z0 + dzdx;
   quad->output.depth[2] = z0 + dzdy;
   quad->output.depth[3] = z0 + dzdx + dzdy;

   qs->next->run( qs->next, quad );
}

struct quad_stage* sp_quad_earlyz_stage

(

struct softpipe_context *

softpipe

)

[read]

Definition at line 77 of file sp_quad_earlyz.c.

References quad_stage::begin, CALLOC_STRUCT, quad_stage::destroy, earlyz_begin(), earlyz_destroy(), earlyz_quad(), quad_stage::run, and quad_stage::softpipe.

{
   struct quad_stage *stage = CALLOC_STRUCT( quad_stage );

   stage->softpipe = softpipe;
   stage->begin = earlyz_begin;
   stage->run = earlyz_quad;
   stage->destroy = earlyz_destroy;

   return stage;
}

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