ffb_tris.c

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

/* $XFree86: xc/lib/GL/mesa/src/drv/ffb/ffb_tris.c,v 1.3 2002/10/30 12:51:28 alanh Exp $
 *
 * GLX Hardware Device Driver for Sun Creator/Creator3D
 * Copyright (C) 2000, 2001 David S. Miller
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * DAVID MILLER, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *
 *    David S. Miller <[e-mail]>
 */

#include "glheader.h"
#include "mtypes.h"
#include "macros.h"
#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "swrast/s_context.h"
#include "tnl/t_context.h"
#include "tnl/t_pipeline.h"

#include "ffb_context.h"
#include "ffb_tris.h"
#include "ffb_lines.h"
#include "ffb_lock.h"
#include "ffb_points.h"
#include "ffb_state.h"
#include "ffb_vb.h"

#undef TRI_DEBUG
#undef FFB_RENDER_TRACE
#undef STATE_TRACE

#ifdef TRI_DEBUG
static void ffb_print_vertex(const ffb_vertex *v)
{
	fprintf(stderr, "Vertex @(%p): "
		"X[%f] Y[%f] Z[%f]\n",
		v, v->x, v->y, v->z);
	fprintf(stderr, "Vertex @(%p): "
		"A[%f] R[%f] G[%f] B[%f]\n",
		v,
		v->color[0].alpha,
		v->color[0].red,
		v->color[0].green,
		v->color[0].blue);
}
#define FFB_DUMP_VERTEX(V)	ffb_print_vertex(V)
#else
#define FFB_DUMP_VERTEX(V)	do { } while(0)
#endif

#define FFB_ALPHA_BIT		0x01
#define FFB_FLAT_BIT		0x02
#define FFB_TRI_CULL_BIT	0x04
#define MAX_FFB_RENDER_FUNCS	0x08

/***********************************************************************
 *         Build low-level triangle/quad rasterize functions           *
 ***********************************************************************/

#define FFB_TRI_FLAT_BIT	0x01
#define FFB_TRI_ALPHA_BIT	0x02
/*#define FFB_TRI_CULL_BIT	0x04*/

static ffb_tri_func ffb_tri_tab[0x8];
static ffb_quad_func ffb_quad_tab[0x8];

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

#define IND (FFB_TRI_FLAT_BIT)
#define TAG(x) x##_flat
#include "ffb_tritmp.h"

#define IND (FFB_TRI_CULL_BIT)
#define TAG(x) x##_cull
#include "ffb_tritmp.h"

#define IND (FFB_TRI_CULL_BIT|FFB_TRI_FLAT_BIT)
#define TAG(x) x##_cull_flat
#include "ffb_tritmp.h"

#define IND (FFB_TRI_ALPHA_BIT)
#define TAG(x) x##_alpha
#include "ffb_tritmp.h"

#define IND (FFB_TRI_ALPHA_BIT|FFB_TRI_FLAT_BIT)
#define TAG(x) x##_alpha_flat
#include "ffb_tritmp.h"

#define IND (FFB_TRI_ALPHA_BIT|FFB_TRI_CULL_BIT)
#define TAG(x) x##_alpha_cull
#include "ffb_tritmp.h"

#define IND (FFB_TRI_ALPHA_BIT|FFB_TRI_CULL_BIT|FFB_TRI_FLAT_BIT)
#define TAG(x) x##_alpha_cull_flat
#include "ffb_tritmp.h"

static void init_tri_tab(void)
{
	ffb_init();
	ffb_init_flat();
	ffb_init_cull();
	ffb_init_cull_flat();
	ffb_init_alpha();
	ffb_init_alpha_flat();
	ffb_init_alpha_cull();
	ffb_init_alpha_cull_flat();
}

/* Build a SWvertex from a hardware vertex. */
static void ffb_translate_vertex(GLcontext *ctx, const ffb_vertex *src,
				 SWvertex *dst)
{
	ffbContextPtr fmesa = FFB_CONTEXT(ctx);
	GLfloat *m = ctx->Viewport._WindowMap.m;
	const GLfloat sx = m[0];
	const GLfloat sy = m[5];
	const GLfloat sz = m[10];
	const GLfloat tx = m[12];
	const GLfloat ty = m[13];
	const GLfloat tz = m[14];

	dst->attrib[FRAG_ATTRIB_WPOS][0] = sx * src->x + tx;
	dst->attrib[FRAG_ATTRIB_WPOS][1] = sy * src->y + ty;
	dst->attrib[FRAG_ATTRIB_WPOS][2] = sz * src->z + tz;
	dst->attrib[FRAG_ATTRIB_WPOS][3] = 1.0;
      
	dst->color[0] = FFB_UBYTE_FROM_COLOR(src->color[0].red);
	dst->color[1] = FFB_UBYTE_FROM_COLOR(src->color[0].green);
	dst->color[2] = FFB_UBYTE_FROM_COLOR(src->color[0].blue);
	dst->color[3] = FFB_UBYTE_FROM_COLOR(src->color[0].alpha);
}

/***********************************************************************
 *          Build fallback triangle/quad rasterize functions           *
 ***********************************************************************/

static void ffb_fallback_triangle(GLcontext *ctx, ffb_vertex *v0,
				  ffb_vertex *v1, ffb_vertex *v2)
{
	SWvertex v[3];

	ffb_translate_vertex(ctx, v0, &v[0]);
	ffb_translate_vertex(ctx, v1, &v[1]);
	ffb_translate_vertex(ctx, v2, &v[2]);

	_swrast_Triangle(ctx, &v[0], &v[1], &v[2]);
}

static void ffb_fallback_quad(GLcontext *ctx,
			      ffb_vertex *v0, ffb_vertex *v1, 
			      ffb_vertex *v2, ffb_vertex *v3)
{
	SWvertex v[4];

	ffb_translate_vertex(ctx, v0, &v[0]);
	ffb_translate_vertex(ctx, v1, &v[1]);
	ffb_translate_vertex(ctx, v2, &v[2]);
	ffb_translate_vertex(ctx, v3, &v[3]);

	_swrast_Quad(ctx, &v[0], &v[1], &v[2], &v[3]);
}

void ffb_fallback_line(GLcontext *ctx, ffb_vertex *v0, ffb_vertex *v1)
{
	SWvertex v[2];

	ffb_translate_vertex(ctx, v0, &v[0]);
	ffb_translate_vertex(ctx, v1, &v[1]);

	_swrast_Line(ctx, &v[0], &v[1]);
}

void ffb_fallback_point(GLcontext *ctx, ffb_vertex *v0)
{
	SWvertex v[1];

	ffb_translate_vertex(ctx, v0, &v[0]);

	_swrast_Point(ctx, &v[0]);
}

/***********************************************************************
 *             Rasterization functions for culled tris/quads           *
 ***********************************************************************/

static void ffb_nodraw_triangle(GLcontext *ctx, ffb_vertex *v0,
				ffb_vertex *v1, ffb_vertex *v2)
{
	(void) (ctx && v0 && v1 && v2);
}

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

static void ffb_update_cullsign(GLcontext *ctx)
{
	GLfloat backface_sign = 1;

	switch (ctx->Polygon.CullFaceMode) {
	case GL_BACK:
		if (ctx->Polygon.FrontFace==GL_CCW)
			backface_sign = -1;
		break;

	case GL_FRONT:
		if (ctx->Polygon.FrontFace!=GL_CCW)
			backface_sign = -1;
		break;

	default:
		break;
	};

	FFB_CONTEXT(ctx)->backface_sign = backface_sign;
}

/***********************************************************************
 *               Choose triangle/quad rasterize functions              *
 ***********************************************************************/

void ffbChooseTriangleState(GLcontext *ctx)
{
	ffbContextPtr fmesa = FFB_CONTEXT(ctx);
	GLuint flags = ctx->_TriangleCaps;
	GLuint ind = 0;

	if (flags & DD_TRI_SMOOTH) {
		fmesa->draw_tri = ffb_fallback_triangle;
		fmesa->draw_quad = ffb_fallback_quad;
		return;
	}

	if (flags & DD_FLATSHADE)
		ind |= FFB_TRI_FLAT_BIT;

	if (ctx->Polygon.CullFlag) {
		if (ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
			fmesa->draw_tri = ffb_nodraw_triangle;
			fmesa->draw_quad = ffb_nodraw_quad;
			return;
		}

		ind |= FFB_TRI_CULL_BIT;
		ffb_update_cullsign(ctx);
	} else
		FFB_CONTEXT(ctx)->backface_sign = 0;
		
	/* If blending or the alpha test is enabled we need to
	 * provide alpha components to the chip, else we can
	 * do without it and thus feed vertex data to the chip
	 * more efficiently.
	 */
	if (ctx->Color.BlendEnabled || ctx->Color.AlphaEnabled)
		ind |= FFB_TRI_ALPHA_BIT;

	fmesa->draw_tri = ffb_tri_tab[ind];
	fmesa->draw_quad = ffb_quad_tab[ind];
}

static const GLenum reduced_prim[GL_POLYGON+1] = {
   GL_POINTS,
   GL_LINES,
   GL_LINES,
   GL_LINES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES
};

static void ffbRenderPrimitive(GLcontext *ctx, GLenum prim);
static void ffbRasterPrimitive(GLcontext *ctx, GLenum rprim);

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

#define FFB_OFFSET_BIT  	0x01
#define FFB_TWOSIDE_BIT 	0x02
#define FFB_UNFILLED_BIT	0x04
#define FFB_MAX_TRIFUNC 	0x08

static struct {
	tnl_triangle_func triangle;
	tnl_quad_func quad;
} rast_tab[FFB_MAX_TRIFUNC];

#define DO_OFFSET   (IND & FFB_OFFSET_BIT)
#define DO_UNFILLED (IND & FFB_UNFILLED_BIT)
#define DO_TWOSIDE  (IND & FFB_TWOSIDE_BIT)
#define DO_FLAT      0
#define DO_QUAD      1
#define DO_FULL_QUAD 1
#define DO_TRI       1
#define DO_LINE      0
#define DO_POINTS    0

#define QUAD( a, b, c, d ) fmesa->draw_quad( ctx, a, b, c, d )
#define TRI( a, b, c )     fmesa->draw_tri( ctx, a, b, c )
#define LINE( a, b )       fmesa->draw_line( ctx, a, b )
#define POINT( a )         fmesa->draw_point( ctx, a )

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

#define UNFILLED_TRI      unfilled_tri
#define UNFILLED_QUAD     unfilled_quad
#define DEPTH_SCALE       (fmesa->depth_scale)
#define VERT_X(_v)        (_v->x)
#define VERT_Y(_v)        (_v->y)
#define VERT_Z(_v)	  (_v->z)
#define AREA_IS_CCW( a )  (a < fmesa->ffb_zero)
#define GET_VERTEX(e)     (&fmesa->verts[e])
#define INSANE_VERTICES
#define VERT_SET_Z(v,val) ((v)->z = (val))
#define VERT_Z_ADD(v,val) ((v)->z += (val))

#define VERT_COPY_RGBA1( _v )     _v->color[0] = _v->color[1]
#define VERT_COPY_RGBA( v0, v1 )  v0->color[0] = v1->color[0] 
#define VERT_SAVE_RGBA( idx )     color[idx] = v[idx]->color[0]
#define VERT_RESTORE_RGBA( idx )  v[idx]->color[0] = color[idx]   

#define LOCAL_VARS(n)				\
   ffbContextPtr fmesa = FFB_CONTEXT(ctx);	\
   __DRIdrawablePrivate *dPriv = fmesa->driDrawable; \
   ffb_color color[n];				\
   (void) color; (void) dPriv;

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

#define RASTERIZE(x) if (fmesa->raster_primitive != reduced_prim[x]) \
                        ffbRasterPrimitive( ctx, reduced_prim[x] )
#define RENDER_PRIMITIVE fmesa->render_primitive
#define TAG(x) x
#include "tnl_dd/t_dd_unfilled.h"

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

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

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

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

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

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

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

#define IND (FFB_TWOSIDE_BIT|FFB_UNFILLED_BIT)
#define TAG(x) x##_twoside_unfilled
#include "tnl_dd/t_dd_tritmp.h"

#define IND (FFB_TWOSIDE_BIT|FFB_OFFSET_BIT|FFB_UNFILLED_BIT)
#define TAG(x) x##_twoside_offset_unfilled
#include "tnl_dd/t_dd_tritmp.h"

static void init_rast_tab( void )
{
   init();
   init_offset();
   init_twoside();
   init_twoside_offset();
   init_unfilled();
   init_offset_unfilled();
   init_twoside_unfilled();
   init_twoside_offset_unfilled();
}

/**********************************************************************/
/*                   Render clipped primitives                        */
/**********************************************************************/

static void ffbRenderClippedPolygon(GLcontext *ctx, const GLuint *elts, GLuint n)
{
	ffbContextPtr fmesa = FFB_CONTEXT(ctx);
	TNLcontext *tnl = TNL_CONTEXT(ctx);
	struct vertex_buffer *VB = &tnl->vb;
	GLuint prim = fmesa->render_primitive;

	/* Render the new vertices as an unclipped polygon. */
	{
		GLuint *tmp = VB->Elts;
		VB->Elts = (GLuint *)elts;
		tnl->Driver.Render.PrimTabElts[GL_POLYGON](ctx, 0, n, PRIM_BEGIN|PRIM_END);
		VB->Elts = tmp;
	}

	/* Restore the render primitive. */
	if (prim != GL_POLYGON)
		tnl->Driver.Render.PrimitiveNotify(ctx, prim);
}

static void ffbRenderClippedLine(GLcontext *ctx, GLuint ii, GLuint jj)
{
	TNLcontext *tnl = TNL_CONTEXT(ctx);
	tnl->Driver.Render.Line(ctx, ii, jj);
}

/**********************************************************************/
/*               Render unclipped begin/end objects                   */
/**********************************************************************/

static void ffb_vb_noop(GLcontext *ctx, GLuint start, GLuint count, GLuint flags)
{
	(void)(ctx && start && count && flags);
}

#define ELT(x)	x

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

#define IND	(FFB_FLAT_BIT)
#define TAG(x)	x##_flat
#include "ffb_rendertmp.h"

#define IND	(FFB_ALPHA_BIT)
#define TAG(x)	x##_alpha
#include "ffb_rendertmp.h"

#define IND	(FFB_FLAT_BIT | FFB_ALPHA_BIT)
#define TAG(x)	x##_flat_alpha
#include "ffb_rendertmp.h"

#define IND	(FFB_TRI_CULL_BIT)