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/* $Id: t_vb_render.c,v 1.1 2003-02-28 11:48:07 pj Exp $ */
/*
* Mesa 3-D graphics library
* Version: 4.0.1
*
* Copyright (C) 1999-2001 Brian Paul 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, 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
* BRIAN PAUL 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.
*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
/*
* Render whole vertex buffers, including projection of vertices from
* clip space and clipping of primitives.
*
* This file makes calls to project vertices and to the point, line
* and triangle rasterizers via the function pointers:
*
* context->Driver.Render.*
*
*/
#include "glheader.h"
#include "context.h"
#include "enums.h"
#include "macros.h"
#include "imports.h"
#include "mtypes.h"
#include "mmath.h"
#include "math/m_matrix.h"
#include "math/m_xform.h"
#include "t_pipeline.h"
/**********************************************************************/
/* Clip single primitives */
/**********************************************************************/
#if defined(USE_IEEE)
#define NEGATIVE(x) (GET_FLOAT_BITS(x) & (1<<31))
#define DIFFERENT_SIGNS(x,y) ((GET_FLOAT_BITS(x) ^ GET_FLOAT_BITS(y)) & (1<<31))
#else
#define NEGATIVE(x) (x < 0)
#define DIFFERENT_SIGNS(x,y) (x * y <= 0 && x - y != 0)
/* Could just use (x*y<0) except for the flatshading requirements.
* Maybe there's a better way?
*/
#endif
#define W(i) coord[i][3]
#define Z(i) coord[i][2]
#define Y(i) coord[i][1]
#define X(i) coord[i][0]
#define SIZE 4
#define TAG(x) x##_4
#include "t_vb_cliptmp.h"
/**********************************************************************/
/* Clip and render whole begin/end objects */
/**********************************************************************/
#define NEED_EDGEFLAG_SETUP (ctx->_TriangleCaps & DD_TRI_UNFILLED)
#define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
#define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
/* Vertices, with the possibility of clipping.
*/
#define RENDER_POINTS( start, count ) \
tnl->Driver.Render.Points( ctx, start, count )
#define RENDER_LINE( v1, v2 ) \
do { \
GLubyte c1 = mask[v1], c2 = mask[v2]; \
GLubyte ormask = c1|c2; \
if (!ormask) \
LineFunc( ctx, v1, v2 ); \
else if (!(c1 & c2 & 0x3f)) \
clip_line_4( ctx, v1, v2, ormask ); \
} while (0)
#define RENDER_TRI( v1, v2, v3 ) \
do { \
GLubyte c1 = mask[v1], c2 = mask[v2], c3 = mask[v3]; \
GLubyte ormask = c1|c2|c3; \
if (!ormask) \
TriangleFunc( ctx, v1, v2, v3 ); \
else if (!(c1 & c2 & c3 & 0x3f)) \
clip_tri_4( ctx, v1, v2, v3, ormask ); \
} while (0)
#define RENDER_QUAD( v1, v2, v3, v4 ) \
do { \
GLubyte c1 = mask[v1], c2 = mask[v2]; \
GLubyte c3 = mask[v3], c4 = mask[v4]; \
GLubyte ormask = c1|c2|c3|c4; \
if (!ormask) \
QuadFunc( ctx, v1, v2, v3, v4 ); \
else if (!(c1 & c2 & c3 & c4 & 0x3f)) \
clip_quad_4( ctx, v1, v2, v3, v4, ormask ); \
} while (0)
#define LOCAL_VARS \
TNLcontext *tnl = TNL_CONTEXT(ctx); \
struct vertex_buffer *VB = &tnl->vb; \
const GLuint * const elt = VB->Elts; \
const GLubyte *mask = VB->ClipMask; \
const GLuint sz = VB->ClipPtr->size; \
const line_func LineFunc = tnl->Driver.Render.Line; \
const triangle_func TriangleFunc = tnl->Driver.Render.Triangle; \
const quad_func QuadFunc = tnl->Driver.Render.Quad; \
const GLboolean stipple = ctx->Line.StippleFlag; \
(void) (LineFunc && TriangleFunc && QuadFunc); \
(void) elt; (void) mask; (void) sz; (void) stipple;
#define TAG(x) clip_##x##_verts
#define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )
#define RESET_STIPPLE if (stipple) tnl->Driver.Render.ResetLineStipple( ctx )
#define RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE
#define PRESERVE_VB_DEFS
#include "t_vb_rendertmp.h"
/* Elts, with the possibility of clipping.
*/
#undef ELT
#undef TAG
#define ELT(x) elt[x]
#define TAG(x) clip_##x##_elts
#include "t_vb_rendertmp.h"
/* TODO: do this for all primitives, verts and elts:
*/
static void clip_elt_triangles( GLcontext *ctx,
GLuint start,
GLuint count,
GLuint flags )
{
TNLcontext *tnl = TNL_CONTEXT(ctx);
render_func render_tris = tnl->Driver.Render.PrimTabElts[GL_TRIANGLES];
struct vertex_buffer *VB = &tnl->vb;
const GLuint * const elt = VB->Elts;
GLubyte *mask = VB->ClipMask;
GLuint last = count-2;
GLuint j;
(void) flags;
tnl->Driver.Render.PrimitiveNotify( ctx, GL_TRIANGLES );
for (j=start; j < last; j+=3 ) {
GLubyte c1 = mask[elt[j]];
GLubyte c2 = mask[elt[j+1]];
GLubyte c3 = mask[elt[j+2]];
GLubyte ormask = c1|c2|c3;
if (ormask) {
if (start < j)
render_tris( ctx, start, j, 0 );
if (!(c1&c2&c3&0x3f))
clip_tri_4( ctx, elt[j], elt[j+1], elt[j+2], ormask );
start = j+3;
}
}
if (start < j)
render_tris( ctx, start, j, 0 );
}
/**********************************************************************/
/* Render whole begin/end objects */
/**********************************************************************/
#define NEED_EDGEFLAG_SETUP (ctx->_TriangleCaps & DD_TRI_UNFILLED)
#define EDGEFLAG_GET(idx) VB->EdgeFlag[idx]
#define EDGEFLAG_SET(idx, val) VB->EdgeFlag[idx] = val
/* Vertices, no clipping.
*/
#define RENDER_POINTS( start, count ) \
tnl->Driver.Render.Points( ctx, start, count )
#define RENDER_LINE( v1, v2 ) \
LineFunc( ctx, v1, v2 )
#define RENDER_TRI( v1, v2, v3 ) \
TriangleFunc( ctx, v1, v2, v3 )
#define RENDER_QUAD( v1, v2, v3, v4 ) \
QuadFunc( ctx, v1, v2, v3, v4 )
#define TAG(x) _tnl_##x##_verts
#define LOCAL_VARS \
TNLcontext *tnl = TNL_CONTEXT(ctx); \
struct vertex_buffer *VB = &tnl->vb; \
const GLuint * const elt = VB->Elts; \
const line_func LineFunc = tnl->Driver.Render.Line; \
const triangle_func TriangleFunc = tnl->Driver.Render.Triangle; \
const quad_func QuadFunc = tnl->Driver.Render.Quad; \
const GLboolean stipple = ctx->Line.StippleFlag; \
(void) (LineFunc && TriangleFunc && QuadFunc); \
(void) elt; (void) stipple
#define RESET_STIPPLE if (stipple) tnl->Driver.Render.ResetLineStipple( ctx )
#define RESET_OCCLUSION ctx->OcclusionResult = GL_TRUE
#define INIT(x) tnl->Driver.Render.PrimitiveNotify( ctx, x )
#define RENDER_TAB_QUALIFIER
#define PRESERVE_VB_DEFS
#include "t_vb_rendertmp.h"
/* Elts, no clipping.
*/
#undef ELT
#define TAG(x) _tnl_##x##_elts
#define ELT(x) elt[x]
#include "t_vb_rendertmp.h"
/**********************************************************************/
/* Helper functions for drivers */
/**********************************************************************/
void _tnl_RenderClippedPolygon( GLcontext *ctx, const GLuint *elts, GLuint n )
{
TNLcontext *tnl = TNL_CONTEXT(ctx);
struct vertex_buffer *VB = &tnl->vb;
GLuint *tmp = VB->Elts;
VB->Elts = (GLuint *)elts;
tnl->Driver.Render.PrimTabElts[GL_POLYGON]( ctx, 0, n, PRIM_BEGIN|PRIM_END );
VB->Elts = tmp;
}
void _tnl_RenderClippedLine( GLcontext *ctx, GLuint ii, GLuint jj )
{
TNLcontext *tnl = TNL_CONTEXT(ctx);
tnl->Driver.Render.Line( ctx, ii, jj );
}
/**********************************************************************/
/* Clip and render whole vertex buffers */
/**********************************************************************/
static GLboolean run_render( GLcontext *ctx,
struct gl_pipeline_stage *stage )
{
TNLcontext *tnl = TNL_CONTEXT(ctx);
struct vertex_buffer *VB = &tnl->vb;
GLuint new_inputs = stage->changed_inputs;
render_func *tab;
GLint pass = 0;
/* Allow the drivers to lock before projected verts are built so
* that window coordinates are guarenteed not to change before
* rendering.
*/
ASSERT(tnl->Driver.Render.Start);
tnl->Driver.Render.Start( ctx );
ASSERT(tnl->Driver.Render.BuildVertices);
ASSERT(tnl->Driver.Render.PrimitiveNotify);
ASSERT(tnl->Driver.Render.Points);
ASSERT(tnl->Driver.Render.Line);
ASSERT(tnl->Driver.Render.Triangle);
ASSERT(tnl->Driver.Render.Quad);
ASSERT(tnl->Driver.Render.ResetLineStipple);
ASSERT(tnl->Driver.Render.Interp);
ASSERT(tnl->Driver.Render.CopyPV);
ASSERT(tnl->Driver.Render.ClippedLine);
ASSERT(tnl->Driver.Render.ClippedPolygon);
ASSERT(tnl->Driver.Render.Finish);
tnl->Driver.Render.BuildVertices( ctx, 0, VB->Count, new_inputs );
if (VB->ClipOrMask) {
tab = VB->Elts ? clip_render_tab_elts : clip_render_tab_verts;
clip_render_tab_elts[GL_TRIANGLES] = clip_elt_triangles;
}
else {
tab = (VB->Elts ?
tnl->Driver.Render.PrimTabElts :
tnl->Driver.Render.PrimTabVerts);
}
do
{
GLuint i, length, flags = 0;
for (i = VB->FirstPrimitive ; !(flags & PRIM_LAST) ; i += length)
{
flags = VB->Primitive[i];
length= VB->PrimitiveLength[i];
ASSERT(length || (flags & PRIM_LAST));
ASSERT((flags & PRIM_MODE_MASK) <= GL_POLYGON+1);
if (MESA_VERBOSE & VERBOSE_PRIMS)
_mesa_debug(NULL, "MESA prim %s %d..%d\n",
_mesa_lookup_enum_by_nr(flags & PRIM_MODE_MASK),
i, i+length);
if (length)
tab[flags & PRIM_MODE_MASK]( ctx, i, i + length, flags );
}
} while (tnl->Driver.Render.Multipass &&
tnl->Driver.Render.Multipass( ctx, ++pass ));
tnl->Driver.Render.Finish( ctx );
/* _swrast_flush(ctx); */
/* usleep(1000000); */
return GL_FALSE; /* finished the pipe */
}
/**********************************************************************/
/* Render pipeline stage */
/**********************************************************************/
/* Quite a bit of work involved in finding out the inputs for the
* render stage.
*/
static void check_render( GLcontext *ctx, struct gl_pipeline_stage *stage )
{
GLuint inputs = VERT_BIT_CLIP;
GLuint i;
if (ctx->Visual.rgbMode) {
inputs |= VERT_BIT_COLOR0;
if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
inputs |= VERT_BIT_COLOR1;
if (ctx->Texture._EnabledUnits) {
for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++) {
if (ctx->Texture.Unit[i]._ReallyEnabled)
inputs |= VERT_BIT_TEX(i);
}
}
}
else {
inputs |= VERT_BIT_INDEX;
}
if (ctx->Point._Attenuated)
inputs |= VERT_BIT_POINT_SIZE;
/* How do drivers turn this off?
*/
if (ctx->Fog.Enabled)
inputs |= VERT_BIT_FOG;
if (ctx->_TriangleCaps & DD_TRI_UNFILLED)
inputs |= VERT_BIT_EDGEFLAG;
if (ctx->RenderMode==GL_FEEDBACK)
inputs |= VERT_BITS_TEX_ANY;
stage->inputs = inputs;
}
static void dtr( struct gl_pipeline_stage *stage )
{
}
const struct gl_pipeline_stage _tnl_render_stage =
{
"render", /* name */
(_NEW_BUFFERS |
_DD_NEW_SEPARATE_SPECULAR |
_DD_NEW_FLATSHADE |
_NEW_TEXTURE|
_NEW_LIGHT|
_NEW_POINT|
_NEW_FOG|
_DD_NEW_TRI_UNFILLED |
_NEW_RENDERMODE), /* re-check (new inputs, interp function) */
0, /* re-run (always runs) */
GL_TRUE, /* active? */
0, /* inputs (set in check_render) */
0, /* outputs */
0, /* changed_inputs */
NULL, /* private data */
dtr, /* destructor */
check_render, /* check */
run_render /* run */
};