src/mesa/vbo/vbo_exec_draw.c - platform/external/mesa3d - Git at Google

 /*
  * Mesa 3-D graphics library
  * Version:  7.2
  *
  * Copyright (C) 1999-2008  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>
  */

 #include "main/glheader.h"
 #include "main/bufferobj.h"
 #include "main/compiler.h"
 #include "main/context.h"
 #include "main/enums.h"
 #include "main/mfeatures.h"
 #include "main/state.h"
 #include "main/vtxfmt.h"

 #include "vbo_context.h"
 #include "vbo_noop.h"


 #if FEATURE_beginend


 static void
 vbo_exec_debug_verts( struct vbo_exec_context *exec )
 {
    GLuint count = exec->vtx.vert_count;
    GLuint i;

    printf("%s: %u vertices %d primitives, %d vertsize\n",
 	  __FUNCTION__,
 	  count,
 	  exec->vtx.prim_count,
 	  exec->vtx.vertex_size);

    for (i = 0 ; i < exec->vtx.prim_count ; i++) {
       struct _mesa_prim *prim = &exec->vtx.prim[i];
       printf("   prim %d: %s%s %d..%d %s %s\n",
 	     i,
 	     _mesa_lookup_prim_by_nr(prim->mode),
 	     prim->weak ? " (weak)" : "",
 	     prim->start,
 	     prim->start + prim->count,
 	     prim->begin ? "BEGIN" : "(wrap)",
 	     prim->end ? "END" : "(wrap)");
    }
 }


 /*
  * NOTE: Need to have calculated primitives by this point -- do it on the fly.
  * NOTE: Old 'parity' issue is gone.
  */
 static GLuint
 vbo_copy_vertices( struct vbo_exec_context *exec )
 {
    GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
    GLuint ovf, i;
    GLuint sz = exec->vtx.vertex_size;
    GLfloat *dst = exec->vtx.copied.buffer;
    const GLfloat *src = (exec->vtx.buffer_map +
                          exec->vtx.prim[exec->vtx.prim_count-1].start *
                          exec->vtx.vertex_size);


    switch (exec->ctx->Driver.CurrentExecPrimitive) {
    case GL_POINTS:
       return 0;
    case GL_LINES:
       ovf = nr&1;
       for (i = 0 ; i < ovf ; i++)
 	 memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
       return i;
    case GL_TRIANGLES:
       ovf = nr%3;
       for (i = 0 ; i < ovf ; i++)
 	 memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
       return i;
    case GL_QUADS:
       ovf = nr&3;
       for (i = 0 ; i < ovf ; i++)
 	 memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
       return i;
    case GL_LINE_STRIP:
       if (nr == 0) {
 	 return 0;
       }
       else {
 	 memcpy( dst, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 	 return 1;
       }
    case GL_LINE_LOOP:
    case GL_TRIANGLE_FAN:
    case GL_POLYGON:
       if (nr == 0) {
 	 return 0;
       }
       else if (nr == 1) {
 	 memcpy( dst, src+0, sz * sizeof(GLfloat) );
 	 return 1;
       }
       else {
 	 memcpy( dst, src+0, sz * sizeof(GLfloat) );
 	 memcpy( dst+sz, src+(nr-1)*sz, sz * sizeof(GLfloat) );
 	 return 2;
       }
    case GL_TRIANGLE_STRIP:
       /* no parity issue, but need to make sure the tri is not drawn twice */
       if (nr & 1) {
 	 exec->vtx.prim[exec->vtx.prim_count-1].count--;
       }
       /* fallthrough */
    case GL_QUAD_STRIP:
       switch (nr) {
       case 0:
          ovf = 0;
          break;
       case 1:
          ovf = 1;
          break;
       default:
          ovf = 2 + (nr & 1);
          break;
       }
       for (i = 0 ; i < ovf ; i++)
 	 memcpy( dst+i*sz, src+(nr-ovf+i)*sz, sz * sizeof(GLfloat) );
       return i;
    case PRIM_OUTSIDE_BEGIN_END:
       return 0;
    default:
       assert(0);
       return 0;
    }
 }


 /* TODO: populate these as the vertex is defined:
  */
 static void
 vbo_exec_bind_arrays( struct gl_context *ctx )
 {
    struct vbo_context *vbo = vbo_context(ctx);
    struct vbo_exec_context *exec = &vbo->exec;
    struct gl_client_array *arrays = exec->vtx.arrays;
    const GLuint count = exec->vtx.vert_count;
    const GLuint *map;
    GLuint attr;
    GLbitfield64 varying_inputs = 0x0;

    /* Install the default (ie Current) attributes first, then overlay
     * all active ones.
     */
    switch (get_program_mode(exec->ctx)) {
    case VP_NONE:
       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
       }
       for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
          ASSERT(VERT_ATTRIB_GENERIC(attr) < Elements(exec->vtx.inputs));
          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
             &vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT+attr];
       }
       map = vbo->map_vp_none;
       break;
    case VP_NV:
    case VP_ARB:
       /* The aliasing of attributes for NV vertex programs has already
        * occurred.  NV vertex programs cannot access material values,
        * nor attributes greater than VERT_ATTRIB_TEX7.
        */
       for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
          exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
       }
       for (attr = 0; attr < VERT_ATTRIB_GENERIC_MAX; attr++) {
          ASSERT(VERT_ATTRIB_GENERIC(attr) < Elements(exec->vtx.inputs));
          exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
             &vbo->currval[VBO_ATTRIB_GENERIC0+attr];
       }
       map = vbo->map_vp_arb;

       /* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
        * In that case we effectively need to route the data from
        * glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
        */
       if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
           (ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
          exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
          exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
          exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
          exec->vtx.attrsz[0] = 0;
       }
       break;
    default:
       assert(0);
    }

    for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
       const GLuint src = map[attr];

       if (exec->vtx.attrsz[src]) {
 	 GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
 	    (GLbyte *)exec->vtx.vertex;

          /* override the default array set above */
          ASSERT(attr < Elements(exec->vtx.inputs));
          ASSERT(attr < Elements(exec->vtx.arrays)); /* arrays[] */
          exec->vtx.inputs[attr] = &arrays[attr];

          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
             /* a real buffer obj: Ptr is an offset, not a pointer*/
             assert(exec->vtx.bufferobj->Pointer);  /* buf should be mapped */
             assert(offset >= 0);
             arrays[attr].Ptr = (GLubyte *)exec->vtx.bufferobj->Offset + offset;
          }
          else {
             /* Ptr into ordinary app memory */
             arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
          }
 	 arrays[attr].Size = exec->vtx.attrsz[src];
 	 arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
 	 arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
 	 arrays[attr].Type = exec->vtx.attrtype[src];
 	 arrays[attr].Integer =
                vbo_attrtype_to_integer_flag(exec->vtx.attrtype[src]);
          arrays[attr].Format = GL_RGBA;
 	 arrays[attr].Enabled = 1;
          arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
          _mesa_reference_buffer_object(ctx,
                                        &arrays[attr].BufferObj,
                                        exec->vtx.bufferobj);
 	 arrays[attr]._MaxElement = count; /* ??? */

          varying_inputs |= VERT_BIT(attr);
       }
    }

    _mesa_set_varying_vp_inputs( ctx, varying_inputs );
    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 }


 /**
  * Unmap the VBO.  This is called before drawing.
  */
 static void
 vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
 {
    if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
       struct gl_context *ctx = exec->ctx;

       if (ctx->Driver.FlushMappedBufferRange) {
          GLintptr offset = exec->vtx.buffer_used - exec->vtx.bufferobj->Offset;
          GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) * sizeof(float);

          if (length)
             ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
                                                exec->vtx.bufferobj);
       }

       exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
                                 exec->vtx.buffer_map) * sizeof(float);

       assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
       assert(exec->vtx.buffer_ptr != NULL);

       ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj);
       exec->vtx.buffer_map = NULL;
       exec->vtx.buffer_ptr = NULL;
       exec->vtx.max_vert = 0;
    }
 }


 /**
  * Map the vertex buffer to begin storing glVertex, glColor, etc data.
  */
 void
 vbo_exec_vtx_map( struct vbo_exec_context *exec )
 {
    struct gl_context *ctx = exec->ctx;
    const GLenum accessRange = GL_MAP_WRITE_BIT |  /* for MapBufferRange */
                               GL_MAP_INVALIDATE_RANGE_BIT |
                               GL_MAP_UNSYNCHRONIZED_BIT |
                               GL_MAP_FLUSH_EXPLICIT_BIT |
                               MESA_MAP_NOWAIT_BIT;
    const GLenum usage = GL_STREAM_DRAW_ARB;

    if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
       return;

    assert(!exec->vtx.buffer_map);
    assert(!exec->vtx.buffer_ptr);

    if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
       /* The VBO exists and there's room for more */
       if (exec->vtx.bufferobj->Size > 0) {
          exec->vtx.buffer_map =
             (GLfloat *)ctx->Driver.MapBufferRange(ctx,
                                                   exec->vtx.buffer_used,
                                                   (VBO_VERT_BUFFER_SIZE -
                                                    exec->vtx.buffer_used),
                                                   accessRange,
                                                   exec->vtx.bufferobj);
          exec->vtx.buffer_ptr = exec->vtx.buffer_map;
       }
       else {
          exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
       }
    }

    if (!exec->vtx.buffer_map) {
       /* Need to allocate a new VBO */
       exec->vtx.buffer_used = 0;

       if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
                                   VBO_VERT_BUFFER_SIZE,
                                   NULL, usage, exec->vtx.bufferobj)) {
          /* buffer allocation worked, now map the buffer */
          exec->vtx.buffer_map =
             (GLfloat *)ctx->Driver.MapBufferRange(ctx,
                                                   0, VBO_VERT_BUFFER_SIZE,
                                                   accessRange,
                                                   exec->vtx.bufferobj);
       }
       else {
          _mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
          exec->vtx.buffer_map = NULL;
       }
    }

    exec->vtx.buffer_ptr = exec->vtx.buffer_map;

    if (!exec->vtx.buffer_map) {
       /* out of memory */
       _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
    }
    else {
       if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
          /* The no-op functions are installed so switch back to regular
           * functions.  We do this test just to avoid frequent and needless
           * calls to _mesa_install_exec_vtxfmt().
           */
          _mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
       }
    }

    if (0)
       printf("map %d..\n", exec->vtx.buffer_used);
 }


 /**
  * Execute the buffer and save copied verts.
  * \param keep_unmapped  if true, leave the VBO unmapped when we're done.
  */
 void
 vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
 {
    if (0)
       vbo_exec_debug_verts( exec );

    if (exec->vtx.prim_count &&
        exec->vtx.vert_count) {

       exec->vtx.copied.nr = vbo_copy_vertices( exec );

       if (exec->vtx.copied.nr != exec->vtx.vert_count) {
 	 struct gl_context *ctx = exec->ctx;

 	 /* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
           * from _mesa_set_varying_vp_inputs().
 	  */
 	 vbo_exec_bind_arrays( ctx );

          if (ctx->NewState)
             _mesa_update_state( ctx );

          if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
             vbo_exec_vtx_unmap( exec );
          }

          if (0)
             printf("%s %d %d\n", __FUNCTION__, exec->vtx.prim_count,
 		   exec->vtx.vert_count);

 	 vbo_context(ctx)->draw_prims( ctx,
 				       exec->vtx.prim,
 				       exec->vtx.prim_count,
 				       NULL,
 				       GL_TRUE,
 				       0,
 				       exec->vtx.vert_count - 1,
 				       NULL);

 	 /* If using a real VBO, get new storage -- unless asked not to.
           */
          if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
             vbo_exec_vtx_map( exec );
          }
       }
    }

    /* May have to unmap explicitly if we didn't draw:
     */
    if (keepUnmapped &&
        _mesa_is_bufferobj(exec->vtx.bufferobj) &&
        exec->vtx.buffer_map) {
       vbo_exec_vtx_unmap( exec );
    }

    if (keepUnmapped || exec->vtx.vertex_size == 0)
       exec->vtx.max_vert = 0;
    else
       exec->vtx.max_vert = ((VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
                             (exec->vtx.vertex_size * sizeof(GLfloat)));

    exec->vtx.buffer_ptr = exec->vtx.buffer_map;
    exec->vtx.prim_count = 0;
    exec->vtx.vert_count = 0;
 }


 #endif /* FEATURE_beginend */
	/*
	* Mesa 3-D graphics library
	* Version: 7.2
	*
	* Copyright (C) 1999-2008 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>
	*/

	#include "main/glheader.h"
	#include "main/bufferobj.h"
	#include "main/compiler.h"
	#include "main/context.h"
	#include "main/enums.h"
	#include "main/mfeatures.h"
	#include "main/state.h"
	#include "main/vtxfmt.h"

	#include "vbo_context.h"
	#include "vbo_noop.h"


	#if FEATURE_beginend


	static void
	vbo_exec_debug_verts( struct vbo_exec_context *exec )
	{
	GLuint count = exec->vtx.vert_count;
	GLuint i;

	printf("%s: %u vertices %d primitives, %d vertsize\n",
	__FUNCTION__,
	count,
	exec->vtx.prim_count,
	exec->vtx.vertex_size);

	for (i = 0 ; i < exec->vtx.prim_count ; i++) {
	struct _mesa_prim *prim = &exec->vtx.prim[i];
	printf(" prim %d: %s%s %d..%d %s %s\n",
	i,
	_mesa_lookup_prim_by_nr(prim->mode),
	prim->weak ? " (weak)" : "",
	prim->start,
	prim->start + prim->count,
	prim->begin ? "BEGIN" : "(wrap)",
	prim->end ? "END" : "(wrap)");
	}
	}


	/*
	* NOTE: Need to have calculated primitives by this point -- do it on the fly.
	* NOTE: Old 'parity' issue is gone.
	*/
	static GLuint
	vbo_copy_vertices( struct vbo_exec_context *exec )
	{
	GLuint nr = exec->vtx.prim[exec->vtx.prim_count-1].count;
	GLuint ovf, i;
	GLuint sz = exec->vtx.vertex_size;
	GLfloat *dst = exec->vtx.copied.buffer;
	const GLfloat *src = (exec->vtx.buffer_map +
	exec->vtx.prim[exec->vtx.prim_count-1].start *
	exec->vtx.vertex_size);


	switch (exec->ctx->Driver.CurrentExecPrimitive) {
	case GL_POINTS:
	return 0;
	case GL_LINES:
	ovf = nr&1;
	for (i = 0 ; i < ovf ; i++)
	memcpy( dst+isz, src+(nr-ovf+i)sz, sz * sizeof(GLfloat) );
	return i;
	case GL_TRIANGLES:
	ovf = nr%3;
	for (i = 0 ; i < ovf ; i++)
	memcpy( dst+isz, src+(nr-ovf+i)sz, sz * sizeof(GLfloat) );
	return i;
	case GL_QUADS:
	ovf = nr&3;
	for (i = 0 ; i < ovf ; i++)
	memcpy( dst+isz, src+(nr-ovf+i)sz, sz * sizeof(GLfloat) );
	return i;
	case GL_LINE_STRIP:
	if (nr == 0) {
	return 0;
	}
	else {
	memcpy( dst, src+(nr-1)sz, sz sizeof(GLfloat) );
	return 1;
	}
	case GL_LINE_LOOP:
	case GL_TRIANGLE_FAN:
	case GL_POLYGON:
	if (nr == 0) {
	return 0;
	}
	else if (nr == 1) {
	memcpy( dst, src+0, sz * sizeof(GLfloat) );
	return 1;
	}
	else {
	memcpy( dst, src+0, sz * sizeof(GLfloat) );
	memcpy( dst+sz, src+(nr-1)sz, sz sizeof(GLfloat) );
	return 2;
	}
	case GL_TRIANGLE_STRIP:
	/* no parity issue, but need to make sure the tri is not drawn twice */
	if (nr & 1) {
	exec->vtx.prim[exec->vtx.prim_count-1].count--;
	}
	/* fallthrough */
	case GL_QUAD_STRIP:
	switch (nr) {
	case 0:
	ovf = 0;
	break;
	case 1:
	ovf = 1;
	break;
	default:
	ovf = 2 + (nr & 1);
	break;
	}
	for (i = 0 ; i < ovf ; i++)
	memcpy( dst+isz, src+(nr-ovf+i)sz, sz * sizeof(GLfloat) );
	return i;
	case PRIM_OUTSIDE_BEGIN_END:
	return 0;
	default:
	assert(0);
	return 0;
	}
	}



	/* TODO: populate these as the vertex is defined:
	*/
	static void
	vbo_exec_bind_arrays( struct gl_context *ctx )
	{
	struct vbo_context *vbo = vbo_context(ctx);
	struct vbo_exec_context *exec = &vbo->exec;
	struct gl_client_array *arrays = exec->vtx.arrays;
	const GLuint count = exec->vtx.vert_count;
	const GLuint *map;
	GLuint attr;
	GLbitfield64 varying_inputs = 0x0;

	/* Install the default (ie Current) attributes first, then overlay
	* all active ones.
	*/
	switch (get_program_mode(exec->ctx)) {
	case VP_NONE:
	for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
	exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
	}
	for (attr = 0; attr < MAT_ATTRIB_MAX; attr++) {
	ASSERT(VERT_ATTRIB_GENERIC(attr) < Elements(exec->vtx.inputs));
	exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
	&vbo->currval[VBO_ATTRIB_MAT_FRONT_AMBIENT+attr];
	}
	map = vbo->map_vp_none;
	break;
	case VP_NV:
	case VP_ARB:
	/* The aliasing of attributes for NV vertex programs has already
	* occurred. NV vertex programs cannot access material values,
	* nor attributes greater than VERT_ATTRIB_TEX7.
	*/
	for (attr = 0; attr < VERT_ATTRIB_FF_MAX; attr++) {
	exec->vtx.inputs[attr] = &vbo->currval[VBO_ATTRIB_POS+attr];
	}
	for (attr = 0; attr < VERT_ATTRIB_GENERIC_MAX; attr++) {
	ASSERT(VERT_ATTRIB_GENERIC(attr) < Elements(exec->vtx.inputs));
	exec->vtx.inputs[VERT_ATTRIB_GENERIC(attr)] =
	&vbo->currval[VBO_ATTRIB_GENERIC0+attr];
	}
	map = vbo->map_vp_arb;

	/* check if VERT_ATTRIB_POS is not read but VERT_BIT_GENERIC0 is read.
	* In that case we effectively need to route the data from
	* glVertexAttrib(0, val) calls to feed into the GENERIC0 input.
	*/
	if ((ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_POS) == 0 &&
	(ctx->VertexProgram._Current->Base.InputsRead & VERT_BIT_GENERIC0)) {
	exec->vtx.inputs[VERT_ATTRIB_GENERIC0] = exec->vtx.inputs[0];
	exec->vtx.attrsz[VERT_ATTRIB_GENERIC0] = exec->vtx.attrsz[0];
	exec->vtx.attrptr[VERT_ATTRIB_GENERIC0] = exec->vtx.attrptr[0];
	exec->vtx.attrsz[0] = 0;
	}
	break;
	default:
	assert(0);
	}

	for (attr = 0; attr < VERT_ATTRIB_MAX ; attr++) {
	const GLuint src = map[attr];

	if (exec->vtx.attrsz[src]) {
	GLsizeiptr offset = (GLbyte *)exec->vtx.attrptr[src] -
	(GLbyte *)exec->vtx.vertex;

	/* override the default array set above */
	ASSERT(attr < Elements(exec->vtx.inputs));
	ASSERT(attr < Elements(exec->vtx.arrays)); /* arrays[] */
	exec->vtx.inputs[attr] = &arrays[attr];

	if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
	/* a real buffer obj: Ptr is an offset, not a pointer*/
	assert(exec->vtx.bufferobj->Pointer); /* buf should be mapped */
	assert(offset >= 0);
	arrays[attr].Ptr = (GLubyte *)exec->vtx.bufferobj->Offset + offset;
	}
	else {
	/* Ptr into ordinary app memory */
	arrays[attr].Ptr = (GLubyte *)exec->vtx.buffer_map + offset;
	}
	arrays[attr].Size = exec->vtx.attrsz[src];
	arrays[attr].StrideB = exec->vtx.vertex_size * sizeof(GLfloat);
	arrays[attr].Stride = exec->vtx.vertex_size * sizeof(GLfloat);
	arrays[attr].Type = exec->vtx.attrtype[src];
	arrays[attr].Integer =
	vbo_attrtype_to_integer_flag(exec->vtx.attrtype[src]);
	arrays[attr].Format = GL_RGBA;
	arrays[attr].Enabled = 1;
	arrays[attr]._ElementSize = arrays[attr].Size * sizeof(GLfloat);
	_mesa_reference_buffer_object(ctx,
	&arrays[attr].BufferObj,
	exec->vtx.bufferobj);
	arrays[attr]._MaxElement = count; /* ??? */

	varying_inputs \|= VERT_BIT(attr);
	}
	}

	_mesa_set_varying_vp_inputs( ctx, varying_inputs );
	ctx->NewDriverState \|= ctx->DriverFlags.NewArray;
	}


	/**
	* Unmap the VBO. This is called before drawing.
	*/
	static void
	vbo_exec_vtx_unmap( struct vbo_exec_context *exec )
	{
	if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
	struct gl_context *ctx = exec->ctx;

	if (ctx->Driver.FlushMappedBufferRange) {
	GLintptr offset = exec->vtx.buffer_used - exec->vtx.bufferobj->Offset;
	GLsizeiptr length = (exec->vtx.buffer_ptr - exec->vtx.buffer_map) * sizeof(float);

	if (length)
	ctx->Driver.FlushMappedBufferRange(ctx, offset, length,
	exec->vtx.bufferobj);
	}

	exec->vtx.buffer_used += (exec->vtx.buffer_ptr -
	exec->vtx.buffer_map) * sizeof(float);

	assert(exec->vtx.buffer_used <= VBO_VERT_BUFFER_SIZE);
	assert(exec->vtx.buffer_ptr != NULL);

	ctx->Driver.UnmapBuffer(ctx, exec->vtx.bufferobj);
	exec->vtx.buffer_map = NULL;
	exec->vtx.buffer_ptr = NULL;
	exec->vtx.max_vert = 0;
	}
	}


	/**
	* Map the vertex buffer to begin storing glVertex, glColor, etc data.
	*/
	void
	vbo_exec_vtx_map( struct vbo_exec_context *exec )
	{
	struct gl_context *ctx = exec->ctx;
	const GLenum accessRange = GL_MAP_WRITE_BIT \| /* for MapBufferRange */
	GL_MAP_INVALIDATE_RANGE_BIT \|
	GL_MAP_UNSYNCHRONIZED_BIT \|
	GL_MAP_FLUSH_EXPLICIT_BIT \|
	MESA_MAP_NOWAIT_BIT;
	const GLenum usage = GL_STREAM_DRAW_ARB;

	if (!_mesa_is_bufferobj(exec->vtx.bufferobj))
	return;

	assert(!exec->vtx.buffer_map);
	assert(!exec->vtx.buffer_ptr);

	if (VBO_VERT_BUFFER_SIZE > exec->vtx.buffer_used + 1024) {
	/* The VBO exists and there's room for more */
	if (exec->vtx.bufferobj->Size > 0) {
	exec->vtx.buffer_map =
	(GLfloat *)ctx->Driver.MapBufferRange(ctx,
	exec->vtx.buffer_used,
	(VBO_VERT_BUFFER_SIZE -
	exec->vtx.buffer_used),
	accessRange,
	exec->vtx.bufferobj);
	exec->vtx.buffer_ptr = exec->vtx.buffer_map;
	}
	else {
	exec->vtx.buffer_ptr = exec->vtx.buffer_map = NULL;
	}
	}

	if (!exec->vtx.buffer_map) {
	/* Need to allocate a new VBO */
	exec->vtx.buffer_used = 0;

	if (ctx->Driver.BufferData(ctx, GL_ARRAY_BUFFER_ARB,
	VBO_VERT_BUFFER_SIZE,
	NULL, usage, exec->vtx.bufferobj)) {
	/* buffer allocation worked, now map the buffer */
	exec->vtx.buffer_map =
	(GLfloat *)ctx->Driver.MapBufferRange(ctx,
	0, VBO_VERT_BUFFER_SIZE,
	accessRange,
	exec->vtx.bufferobj);
	}
	else {
	_mesa_error(ctx, GL_OUT_OF_MEMORY, "VBO allocation");
	exec->vtx.buffer_map = NULL;
	}
	}

	exec->vtx.buffer_ptr = exec->vtx.buffer_map;

	if (!exec->vtx.buffer_map) {
	/* out of memory */
	_mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt_noop );
	}
	else {
	if (_mesa_using_noop_vtxfmt(ctx->Exec)) {
	/* The no-op functions are installed so switch back to regular
	* functions. We do this test just to avoid frequent and needless
	* calls to _mesa_install_exec_vtxfmt().
	*/
	_mesa_install_exec_vtxfmt(ctx, &exec->vtxfmt);
	}
	}

	if (0)
	printf("map %d..\n", exec->vtx.buffer_used);
	}



	/**
	* Execute the buffer and save copied verts.
	* \param keep_unmapped if true, leave the VBO unmapped when we're done.
	*/
	void
	vbo_exec_vtx_flush(struct vbo_exec_context *exec, GLboolean keepUnmapped)
	{
	if (0)
	vbo_exec_debug_verts( exec );

	if (exec->vtx.prim_count &&
	exec->vtx.vert_count) {

	exec->vtx.copied.nr = vbo_copy_vertices( exec );

	if (exec->vtx.copied.nr != exec->vtx.vert_count) {
	struct gl_context *ctx = exec->ctx;

	/* Before the update_state() as this may raise _NEW_VARYING_VP_INPUTS
	* from _mesa_set_varying_vp_inputs().
	*/
	vbo_exec_bind_arrays( ctx );

	if (ctx->NewState)
	_mesa_update_state( ctx );

	if (_mesa_is_bufferobj(exec->vtx.bufferobj)) {
	vbo_exec_vtx_unmap( exec );
	}

	if (0)
	printf("%s %d %d\n", __FUNCTION__, exec->vtx.prim_count,
	exec->vtx.vert_count);

	vbo_context(ctx)->draw_prims( ctx,
	exec->vtx.prim,
	exec->vtx.prim_count,
	NULL,
	GL_TRUE,
	0,
	exec->vtx.vert_count - 1,
	NULL);

	/* If using a real VBO, get new storage -- unless asked not to.
	*/
	if (_mesa_is_bufferobj(exec->vtx.bufferobj) && !keepUnmapped) {
	vbo_exec_vtx_map( exec );
	}
	}
	}

	/* May have to unmap explicitly if we didn't draw:
	*/
	if (keepUnmapped &&
	_mesa_is_bufferobj(exec->vtx.bufferobj) &&
	exec->vtx.buffer_map) {
	vbo_exec_vtx_unmap( exec );
	}

	if (keepUnmapped \|\| exec->vtx.vertex_size == 0)
	exec->vtx.max_vert = 0;
	else
	exec->vtx.max_vert = ((VBO_VERT_BUFFER_SIZE - exec->vtx.buffer_used) /
	(exec->vtx.vertex_size * sizeof(GLfloat)));

	exec->vtx.buffer_ptr = exec->vtx.buffer_map;
	exec->vtx.prim_count = 0;
	exec->vtx.vert_count = 0;
	}


	#endif /* FEATURE_beginend */