via_tris.c

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

/*
 * Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved.
 * Copyright 2001-2003 S3 Graphics, Inc. All Rights Reserved.
 *
 * 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, sub license,
 * 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * VIA, S3 GRAPHICS, AND/OR ITS SUPPLIERS 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.
 */

#include <stdio.h>
#include <math.h>

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

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

#include "via_context.h"
#include "via_tris.h"
#include "via_state.h"
#include "via_span.h"
#include "via_ioctl.h"
#include "via_3d_reg.h"
#include "via_tex.h"

/***********************************************************************
 *                    Emit primitives as inline vertices               *
 ***********************************************************************/
#define LINE_FALLBACK (0)
#define POINT_FALLBACK (0)
#define TRI_FALLBACK (0)
#define ANY_FALLBACK_FLAGS (POINT_FALLBACK|LINE_FALLBACK|TRI_FALLBACK)
#define ANY_RASTER_FLAGS (DD_TRI_LIGHT_TWOSIDE|DD_TRI_OFFSET|DD_TRI_UNFILLED)


#if 0
#define COPY_DWORDS(vb, vertsize, v) 		\
do {						\
   via_sse_memcpy(vb, v, vertsize * 4);		\
   vb += vertsize;				\
} while (0)
#else
#if defined( USE_X86_ASM )
#define COPY_DWORDS(vb, vertsize, v)					\
    do {								\
        int j;								\
        int __tmp;							\
        __asm__ __volatile__("rep ; movsl"				\
                              : "=%c" (j), "=D" (vb), "=S" (__tmp)	\
                              : "0" (vertsize),				\
                                "D" ((long)vb),				\
                                "S" ((long)v));				\
    } while (0)
#else
#define COPY_DWORDS(vb, vertsize, v)		\
    do {					\
        int j;					\
        for (j = 0; j < vertsize; j++)		\
            vb[j] = ((GLuint *)v)[j];		\
        vb += vertsize;				\
    } while (0)
#endif
#endif

static void via_draw_triangle(struct via_context *vmesa,
			      viaVertexPtr v0,
			      viaVertexPtr v1,
			      viaVertexPtr v2)
{
   GLuint vertsize = vmesa->vertexSize;
   GLuint *vb = viaExtendPrimitive(vmesa, 3 * 4 * vertsize);

   COPY_DWORDS(vb, vertsize, v0);
   COPY_DWORDS(vb, vertsize, v1);
   COPY_DWORDS(vb, vertsize, v2);
}


static void via_draw_quad(struct via_context *vmesa,
			  viaVertexPtr v0,
			  viaVertexPtr v1,
			  viaVertexPtr v2,
			  viaVertexPtr v3)
{
   GLuint vertsize = vmesa->vertexSize;
   GLuint *vb = viaExtendPrimitive(vmesa, 6 * 4 * vertsize);

   COPY_DWORDS(vb, vertsize, v0);
   COPY_DWORDS(vb, vertsize, v1);
   COPY_DWORDS(vb, vertsize, v3);
   COPY_DWORDS(vb, vertsize, v1);
   COPY_DWORDS(vb, vertsize, v2);
   COPY_DWORDS(vb, vertsize, v3);
}

static void via_draw_line(struct via_context *vmesa,
			  viaVertexPtr v0,
			  viaVertexPtr v1)
{
   GLuint vertsize = vmesa->vertexSize;
   GLuint *vb = viaExtendPrimitive(vmesa, 2 * 4 * vertsize);
   COPY_DWORDS(vb, vertsize, v0);
   COPY_DWORDS(vb, vertsize, v1);
}


static void via_draw_point(struct via_context *vmesa,
			   viaVertexPtr v0)
{
   GLuint vertsize = vmesa->vertexSize;
   GLuint *vb = viaExtendPrimitive(vmesa, 4 * vertsize);
   COPY_DWORDS(vb, vertsize, v0);
}


/* Fallback drawing functions for the ptex hack.
 */
#define PTEX_VERTEX( tmp, vertex_size, v)	\
do {							\
   GLuint j;						\
   GLfloat rhw = 1.0 / v->f[vertex_size];		\
   for ( j = 0 ; j < vertex_size ; j++ )		\
      tmp.f[j] = v->f[j];				\
   tmp.f[3] *= v->f[vertex_size];			\
   tmp.f[vertex_size-2] *= rhw;				\
   tmp.f[vertex_size-1] *= rhw;				\
} while (0)

static void via_ptex_tri (struct via_context *vmesa,
			  viaVertexPtr v0,
			  viaVertexPtr v1,
			  viaVertexPtr v2)
{
   GLuint vertsize = vmesa->hwVertexSize;
   GLuint *vb = viaExtendPrimitive(vmesa, 3*4*vertsize);
   viaVertex tmp;

   PTEX_VERTEX(tmp, vertsize, v0); COPY_DWORDS(vb, vertsize, &tmp);
   PTEX_VERTEX(tmp, vertsize, v1); COPY_DWORDS(vb, vertsize, &tmp);
   PTEX_VERTEX(tmp, vertsize, v2); COPY_DWORDS(vb, vertsize, &tmp);
}

static void via_ptex_line (struct via_context *vmesa,
			   viaVertexPtr v0,
			   viaVertexPtr v1)
{
   GLuint vertsize = vmesa->hwVertexSize;
   GLuint *vb = viaExtendPrimitive(vmesa, 2*4*vertsize);
   viaVertex tmp;

   PTEX_VERTEX(tmp, vertsize, v0); COPY_DWORDS(vb, vertsize, &tmp);
   PTEX_VERTEX(tmp, vertsize, v1); COPY_DWORDS(vb, vertsize, &tmp);
}

static void via_ptex_point (struct via_context *vmesa,
			    viaVertexPtr v0)
{
   GLuint vertsize = vmesa->hwVertexSize;
   GLuint *vb = viaExtendPrimitive(vmesa, 1*4*vertsize);
   viaVertex tmp;

   PTEX_VERTEX(tmp, vertsize, v0); COPY_DWORDS(vb, vertsize, &tmp);
}





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

#define TRI(a, b, c)                                \
    do {                                            \
        if (DO_FALLBACK)                            \
            vmesa->drawTri(vmesa, a, b, c);         \
        else                                        \
            via_draw_triangle(vmesa, a, b, c);      \
    } while (0)

#define QUAD(a, b, c, d)                            \
    do {                                            \
        if (DO_FALLBACK) {                          \
            vmesa->drawTri(vmesa, a, b, d);         \
            vmesa->drawTri(vmesa, b, c, d);         \
        }                                           \
        else                                        \
            via_draw_quad(vmesa, a, b, c, d);       \
    } while (0)

#define LINE(v0, v1)                                \
    do {                                            \
        if (DO_FALLBACK)                            \
            vmesa->drawLine(vmesa, v0, v1);         \
        else                                        \
            via_draw_line(vmesa, v0, v1);           \
    } while (0)

#define POINT(v0)                                    \
    do {                                             \
        if (DO_FALLBACK)                             \
            vmesa->drawPoint(vmesa, v0);             \
        else                                         \
            via_draw_point(vmesa, v0);               \
    } while (0)


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

#define VIA_OFFSET_BIT         0x01
#define VIA_TWOSIDE_BIT        0x02
#define VIA_UNFILLED_BIT       0x04
#define VIA_FALLBACK_BIT       0x08
#define VIA_MAX_TRIFUNC        0x10


static struct {
    tnl_points_func          points;
    tnl_line_func            line;
    tnl_triangle_func        triangle;
    tnl_quad_func            quad;
} rast_tab[VIA_MAX_TRIFUNC + 1];


#define DO_FALLBACK (IND & VIA_FALLBACK_BIT)
#define DO_OFFSET   (IND & VIA_OFFSET_BIT)
#define DO_UNFILLED (IND & VIA_UNFILLED_BIT)
#define DO_TWOSIDE  (IND & VIA_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         1
#define HAVE_BACK_COLORS  0
#define HAVE_HW_FLATSHADE 1
#define VERTEX            viaVertex
#define TAB               rast_tab

/* Only used to pull back colors into vertices (ie, we know color is
 * floating point).
 */
#define VIA_COLOR(dst, src)                     \
    do {                                        \
        dst[0] = src[2];                        \
        dst[1] = src[1];                        \
        dst[2] = src[0];                        \
        dst[3] = src[3];                        \
    } while (0)

#define VIA_SPEC(dst, src)                      \
    do {                                        \
        dst[0] = src[2];                        \
        dst[1] = src[1];                        \
        dst[2] = src[0];                        \
    } while (0)


#define DEPTH_SCALE vmesa->polygon_offset_scale
#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->vertexSize * sizeof(int)))

#define VERT_SET_RGBA( v, c )  					\
do {								\
   via_color_t *color = (via_color_t *)&((v)->ui[coloroffset]);	\
   UNCLAMPED_FLOAT_TO_UBYTE(color->red, (c)[0]);		\
   UNCLAMPED_FLOAT_TO_UBYTE(color->green, (c)[1]);		\
   UNCLAMPED_FLOAT_TO_UBYTE(color->blue, (c)[2]);		\
   UNCLAMPED_FLOAT_TO_UBYTE(color->alpha, (c)[3]);		\
} while (0)

#define VERT_COPY_RGBA( v0, v1 ) v0->ui[coloroffset] = v1->ui[coloroffset]

#define VERT_SET_SPEC( v, c )					\
do {								\
   if (specoffset) {						\
     via_color_t *color = (via_color_t *)&((v)->ui[specoffset]);	\
     UNCLAMPED_FLOAT_TO_UBYTE(color->red, (c)[0]);		\
     UNCLAMPED_FLOAT_TO_UBYTE(color->green, (c)[1]);		\
     UNCLAMPED_FLOAT_TO_UBYTE(color->blue, (c)[2]);		\
   }								\
} while (0)
#define VERT_COPY_SPEC( v0, v1 )			\
do {							\
   if (specoffset) {					\
      v0->ub4[specoffset][0] = v1->ub4[specoffset][0];	\
      v0->ub4[specoffset][1] = v1->ub4[specoffset][1];	\
      v0->ub4[specoffset][2] = v1->ub4[specoffset][2];	\
   }							\
} while (0)


#define VERT_SAVE_RGBA( idx )    color[idx] = v[idx]->ui[coloroffset]
#define VERT_RESTORE_RGBA( idx ) v[idx]->ui[coloroffset] = color[idx]
#define VERT_SAVE_SPEC( idx )    if (specoffset) spec[idx] = v[idx]->ui[specoffset]
#define VERT_RESTORE_SPEC( idx ) if (specoffset) v[idx]->ui[specoffset] = spec[idx]


#define LOCAL_VARS(n)                                                   \
    struct via_context *vmesa = VIA_CONTEXT(ctx);                             \
    GLuint color[n], spec[n];                                           \
    GLuint coloroffset = vmesa->coloroffset;              \
    GLuint specoffset = vmesa->specoffset;                       \
    (void)color; (void)spec; (void)coloroffset; (void)specoffset;


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

static const GLenum hwPrim[GL_POLYGON + 2] = {
    GL_POINTS,
    GL_LINES,
    GL_LINES,
    GL_LINES,
    GL_TRIANGLES,
    GL_TRIANGLES,
    GL_TRIANGLES,
    GL_TRIANGLES,
    GL_TRIANGLES,
    GL_TRIANGLES,
    GL_POLYGON+1
};


#define RASTERIZE(x) viaRasterPrimitive( ctx, x, hwPrim[x] )
#define RENDER_PRIMITIVE vmesa->renderPrimitive
#define TAG(x) x
#define IND VIA_FALLBACK_BIT
#include "tnl_dd/t_dd_unfilled.h"
#undef IND
#undef RASTERIZE

/***********************************************************************
 *                      Generate GL render functions                   *
 ***********************************************************************/
#define RASTERIZE(x)

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

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

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

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

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

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

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

#define IND (VIA_TWOSIDE_BIT|VIA_OFFSET_BIT|VIA_UNFILLED_BIT)