s3v_tris.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/*
 * Author: Max Lingua <[e-mail]>
 */

#include <stdio.h>
#include <stdlib.h>

#include <sys/ioctl.h>

#include "s3v_context.h"
#include "s3v_vb.h"
#include "s3v_tris.h"

#include "glheader.h"
#include "mtypes.h"
#include "macros.h"
#include "colormac.h"

#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "tnl/tnl.h"
#include "tnl/t_context.h"
#include "tnl/t_pipeline.h"


/***********************************************************************
 *                   Build hardware rasterization functions            *
 ***********************************************************************/

#define DO_TRI			1
#define HAVE_RGBA		1
#define HAVE_SPEC		0
#define HAVE_BACK_COLORS	0
#define HAVE_HW_FLATSHADE	1
#define VERTEX			s3vVertex
#define TAB			rast_tab

#define VERT_SET_RGBA( v, c ) \
do { \
	UNCLAMPED_FLOAT_TO_RGBA_CHAN( v->ub4[4], c); \
/*	*(v->ub4[4]) = c; \ */ \
} while (0)
#define VERT_COPY_RGBA( v0, v1 ) v0->ui[4] = v1->ui[4]
/*
#define VERT_COPY_RGBA1( v0, v1 ) v0->ui[4] = v1->ui[4]
*/
#define VERT_SAVE_RGBA( idx )    color[idx] = v[idx]->ui[4]
#define VERT_RESTORE_RGBA( idx ) v[idx]->ui[4] = color[idx]

#define S3V_OFFSET_BIT  	0x01
#define S3V_TWOSIDE_BIT 	0x02
#define S3V_UNFILLED_BIT        0x04
#define S3V_FALLBACK_BIT        0x08
#define S3V_MAX_TRIFUNC 	0x10


static struct {
	tnl_points_func		points;
	tnl_line_func		line;
	tnl_triangle_func	triangle;
	tnl_quad_func		quad;
} rast_tab[S3V_MAX_TRIFUNC];

#define S3V_RAST_CULL_BIT	0x01
#define S3V_RAST_FLAT_BIT	0x02
#define S3V_RAST_TEX_BIT	0x04

static s3v_point_func s3v_point_tab[0x8];
static s3v_line_func s3v_line_tab[0x8];
static s3v_tri_func s3v_tri_tab[0x8];
static s3v_quad_func s3v_quad_tab[0x8];

#define IND (0)
#define TAG(x) x
#include "s3v_tritmp.h"

#define IND (S3V_RAST_CULL_BIT)
#define TAG(x) x##_cull
#include "s3v_tritmp.h"

#define IND (S3V_RAST_FLAT_BIT)
#define TAG(x) x##_flat
#include "s3v_tritmp.h"

#define IND (S3V_RAST_CULL_BIT|S3V_RAST_FLAT_BIT)
#define TAG(x) x##_cull_flat
#include "s3v_tritmp.h"

#define IND (S3V_RAST_TEX_BIT)
#define TAG(x) x##_tex
#include "s3v_tritmp.h"

#define IND (S3V_RAST_CULL_BIT|S3V_RAST_TEX_BIT)
#define TAG(x) x##_cull_tex
#include "s3v_tritmp.h"

#define IND (S3V_RAST_FLAT_BIT|S3V_RAST_TEX_BIT)
#define TAG(x) x##_flat_tex
#include "s3v_tritmp.h"

#define IND (S3V_RAST_CULL_BIT|S3V_RAST_FLAT_BIT|S3V_RAST_TEX_BIT)
#define TAG(x) x##_cull_flat_tex
#include "s3v_tritmp.h"

static void init_rast_tab( void )
{
	DEBUG(("*** init_rast_tab ***\n"));

	s3v_init();
	s3v_init_cull();
	s3v_init_flat();
	s3v_init_cull_flat();
	s3v_init_tex();
	s3v_init_cull_tex();
	s3v_init_flat_tex();
	s3v_init_cull_flat_tex();
}

/***********************************************************************
 *                    Rasterization fallback helpers                   *
 ***********************************************************************/


/* This code is hit only when a mix of accelerated and unaccelerated
 * primitives are being drawn, and only for the unaccelerated
 * primitives.  
 */

#if 0
static void 
s3v_fallback_quad( s3vContextPtr vmesa, 
		    const s3vVertex *v0, 
		    const s3vVertex *v1, 
		    const s3vVertex *v2, 
		    const s3vVertex *v3 )
{
   GLcontext *ctx = vmesa->glCtx;
   SWvertex v[4];
   s3v_translate_vertex( ctx, v0, &v[0] );
   s3v_translate_vertex( ctx, v1, &v[1] );
   s3v_translate_vertex( ctx, v2, &v[2] );
   s3v_translate_vertex( ctx, v3, &v[3] );
   DEBUG(("s3v_fallback_quad\n"));
/*   _swrast_Quad( ctx, &v[0], &v[1], &v[2], &v[3] ); */
}

static void 
s3v_fallback_tri( s3vContextPtr vmesa, 
		    const s3vVertex *v0, 
		    const s3vVertex *v1, 
		    const s3vVertex *v2 )
{
   GLcontext *ctx = vmesa->glCtx;
   SWvertex v[3];
   s3v_translate_vertex( ctx, v0, &v[0] );
   s3v_translate_vertex( ctx, v1, &v[1] );
   s3v_translate_vertex( ctx, v2, &v[2] );
   DEBUG(("s3v_fallback_tri\n"));
/*   _swrast_Triangle( ctx, &v[0], &v[1], &v[2] ); */
}

static void
s3v_fallback_line( s3vContextPtr vmesa,
		     const s3vVertex *v0,
		     const s3vVertex *v1 )
{
   GLcontext *ctx = vmesa->glCtx;
   SWvertex v[2];
   s3v_translate_vertex( ctx, v0, &v[0] );
   s3v_translate_vertex( ctx, v1, &v[1] );
   DEBUG(("s3v_fallback_line\n"));
   _swrast_Line( ctx, &v[0], &v[1] );
}

/*
static void 
s3v_fallback_point( s3vContextPtr vmesa, 
		      const s3vVertex *v0 )
{
   GLcontext *ctx = vmesa->glCtx;
   SWvertex v[1];
   s3v_translate_vertex( ctx, v0, &v[0] );
   _swrast_Point( ctx, &v[0] );
}
*/
#endif

/***********************************************************************
 *                    Choose rasterization functions                   *
 ***********************************************************************/

#define _S3V_NEW_RASTER_STATE 	(_NEW_FOG | \
				 _NEW_TEXTURE | \
				 _DD_NEW_TRI_SMOOTH | \
				 _DD_NEW_LINE_SMOOTH | \
				 _DD_NEW_POINT_SMOOTH | \
				 _DD_NEW_TRI_STIPPLE | \
				 _DD_NEW_LINE_STIPPLE)

#define LINE_FALLBACK (0)
#define TRI_FALLBACK (0)

static void s3v_nodraw_triangle(GLcontext *ctx, s3vVertex *v0,
                                s3vVertex *v1, s3vVertex *v2)
{
	(void) (ctx && v0 && v1 && v2);
}

static void s3v_nodraw_quad(GLcontext *ctx,
                            s3vVertex *v0, s3vVertex *v1,
                            s3vVertex *v2, s3vVertex *v3)
{
	(void) (ctx && v0 && v1 && v2 && v3);
}

void s3vChooseRasterState(GLcontext *ctx);

void s3vChooseRasterState(GLcontext *ctx)
{
	s3vContextPtr vmesa = S3V_CONTEXT(ctx);
	GLuint flags = ctx->_TriangleCaps;
	GLuint ind = 0;

	DEBUG(("*** s3vChooseRasterState ***\n"));

	if (ctx->Polygon.CullFlag) {
		if (ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
			vmesa->draw_tri = (s3v_tri_func)s3v_nodraw_triangle;
			vmesa->draw_quad = (s3v_quad_func)s3v_nodraw_quad;
			return;
		}
		ind |= S3V_RAST_CULL_BIT;
		/* s3v_update_cullsign(ctx); */
	} /* else vmesa->backface_sign = 0; */

	if ( flags & DD_FLATSHADE )
		ind |= S3V_RAST_FLAT_BIT;

	if ( ctx->Texture.Unit[0]._ReallyEnabled ) {
		ind |= S3V_RAST_TEX_BIT;
	}

	DEBUG(("ind = %i\n", ind));

	vmesa->draw_line = s3v_line_tab[ind];
	vmesa->draw_tri = s3v_tri_tab[ind];
	vmesa->draw_quad = s3v_quad_tab[ind];
	vmesa->draw_point = s3v_point_tab[ind];

#if 0
	/* Hook in fallbacks for specific primitives.  CURRENTLY DISABLED
	 */
	
	if (flags & LINE_FALLBACK) 
		vmesa->draw_line = s3v_fallback_line;
	 
	if (flags & TRI_FALLBACK) {
		DEBUG(("TRI_FALLBACK\n"));
		vmesa->draw_tri = s3v_fallback_tri;
		vmesa->draw_quad = s3v_fallback_quad;
	}
#endif
}




/***********************************************************************
 *          Macros for t_dd_tritmp.h to draw basic primitives          *
 ***********************************************************************/

#define TRI( v0, v1, v2 ) \
do { \
	/*
	if (DO_FALLBACK) \
		vmesa->draw_tri( vmesa, v0, v1, v2 ); \
	else */ \
   	DEBUG(("TRI: max was here\n")); /* \
	s3v_draw_tex_triangle( vmesa, v0, v1, v2 ); */ \
	vmesa->draw_tri( vmesa, v0, v1, v2 ); \
} while (0)

#define QUAD( v0, v1, v2, v3 ) \
do { \
	DEBUG(("QUAD: max was here\n")); \
	vmesa->draw_quad( vmesa, v0, v1, v2, v3 ); \
} while (0)

#define LINE( v0, v1 ) \
do { \
	DEBUG(("LINE: max was here\n")); \
	vmesa->draw_line( vmesa, v0, v1 ); \
} while (0)

#define POINT( v0 ) \
do { \
	vmesa->draw_point( vmesa, v0 ); \
} while (0)


/***********************************************************************
 *              Build render functions from dd templates               *
 ***********************************************************************/

/*
#define S3V_OFFSET_BIT 	0x01
#define S3V_TWOSIDE_BIT	0x02
#define S3V_UNFILLED_BIT	0x04
#define S3V_FALLBACK_BIT	0x08
#define S3V_MAX_TRIFUNC	0x10


static struct {
   points_func		points;
   line_func		line;
   triangle_func	triangle;
   quad_func		quad;
} rast_tab[S3V_MAX_TRIFUNC];
*/

#define DO_FALLBACK  (IND & S3V_FALLBACK_BIT)
#define DO_OFFSET    (IND & S3V_OFFSET_BIT)
#define DO_UNFILLED  (IND & S3V_UNFILLED_BIT)
#define DO_TWOSIDE   (IND & S3V_TWOSIDE_BIT)
#define DO_FLAT      0
#define DO_TRI       1
#define DO_QUAD      1
#define DO_LINE      1
#define DO_POINTS    1
#define DO_FULL_QUAD 1

#define HAVE_RGBA         1
#define HAVE_SPEC         0
#define HAVE_BACK_COLORS  0
#define HAVE_HW_FLATSHADE 1
#define VERTEX            s3vVertex
#define TAB               rast_tab

#define DEPTH_SCALE 1.0
#define UNFILLED_TRI unfilled_tri
#define UNFILLED_QUAD unfilled_quad
#define VERT_X(_v) _v->v.x
#define VERT_Y(_v) _v->v.y
#define VERT_Z(_v) _v->v.z
#define AREA_IS_CCW( a ) (a > 0)
#define GET_VERTEX(e) (vmesa->verts + (e<<vmesa->vertex_stride_shift))

#if 0
#define VERT_SET_RGBA( v, c ) \
do { \
/*    UNCLAMPED_FLOAT_TO_RGBA_CHAN( v->ub4[4], c) */ \
} while (0)

#define VERT_COPY_RGBA( v0, v1 ) v0->ui[4] = v1->ui[4]
/*
#define VERT_COPY_RGBA1( v0, v1 ) v0->ui[4] = v1->ui[4]
*/
#define VERT_SAVE_RGBA( idx )    color[idx] = v[idx]->ui[4]
#define VERT_RESTORE_RGBA( idx ) v[idx]->ui[4] = color[idx]   
#endif

#define LOCAL_VARS(n) \
	s3vContextPtr vmesa = S3V_CONTEXT(ctx); \
	GLuint color[n]; \
	(void) color;


/***********************************************************************
 *                Helpers for rendering unfilled primitives            *
 ***********************************************************************/

static const GLuint hw_prim[GL_POLYGON+1] = {
	PrimType_Points,
	PrimType_Lines,
	PrimType_Lines,
	PrimType_Lines,
	PrimType_Triangles,
	PrimType_Triangles,
	PrimType_Triangles,
	PrimType_Triangles,
	PrimType_Triangles,
	PrimType_Triangles
};

static void s3vResetLineStipple( GLcontext *ctx );
static void s3vRasterPrimitive( GLcontext *ctx, GLuint hwprim );
static void s3vRenderPrimitive( GLcontext *ctx, GLenum prim );
/*
extern static void s3v_lines_emit(GLcontext *ctx, GLuint start, GLuint end);
extern static void s3v_tris_emit(GLcontext *ctx, GLuint start, GLuint end);
*/
#define RASTERIZE(x) if (vmesa->hw_primitive != hw_prim[x]) \
                        s3vRasterPrimitive( ctx, hw_prim[x] )
#define RENDER_PRIMITIVE vmesa->render_primitive
#define TAG(x) x
#define IND S3V_FALLBACK_BIT
#include "tnl_dd/t_dd_unfilled.h"
#undef IND

/***********************************************************************
 *                      Generate GL render functions                   *
 ***********************************************************************/

#define IND (0)
#define TAG(x) x
#include "tnl_dd/t_dd_tritmp.h"

#define IND (S3V_OFFSET_BIT)
#define TAG(x) x##_offset
#include "tnl_dd/t_dd_tritmp.h"

#define IND (S3V_TWOSIDE_BIT)
#define TAG(x) x##_twoside
#include "tnl_dd/t_dd_tritmp.h"

#define IND (S3V_TWOSIDE_BIT|S3V_OFFSET_BIT)
#define TAG(x) x##_twoside_offset
#include "tnl_dd/t_dd_tritmp.h"

#define IND (S3V_UNFILLED_BIT)
#define TAG(x) x##_unfilled
#include "tnl_dd/t_dd_tritmp.h"

#define IND (S3V_OFFSET_BIT|S3V_UNFILLED_BIT)
#define TAG(x) x##_offset_unfilled
#include "tnl_dd/t_dd_tritmp.h"