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/**************************************************************************
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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 TUNGSTEN 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 <stdlib.h>
#include "brw_batch.h"
#include "brw_draw.h"
#include "brw_defines.h"
#include "brw_context.h"
#include "brw_state.h"
#include "pipe/p_context.h"
#include "pipe/internal/p_winsys_screen.h"
#include "util/u_prim.h"
static unsigned hw_prim[PIPE_PRIM_POLYGON+1] = {
_3DPRIM_POINTLIST,
_3DPRIM_LINELIST,
_3DPRIM_LINELOOP,
_3DPRIM_LINESTRIP,
_3DPRIM_TRILIST,
_3DPRIM_TRISTRIP,
_3DPRIM_TRIFAN,
_3DPRIM_QUADLIST,
_3DPRIM_QUADSTRIP,
_3DPRIM_POLYGON
};
/* When the primitive changes, set a state bit and re-validate. Not
* the nicest and would rather deal with this by having all the
* programs be immune to the active primitive (ie. cope with all
* possibilities). That may not be realistic however.
*/
static void brw_set_prim(struct brw_context *brw, int prim)
{
PRINT("PRIM: %d\n", prim);
/* Slight optimization to avoid the GS program when not needed:
*/
if (prim == PIPE_PRIM_QUAD_STRIP &&
brw->attribs.Raster->flatshade &&
brw->attribs.Raster->fill_cw == PIPE_POLYGON_MODE_FILL &&
brw->attribs.Raster->fill_ccw == PIPE_POLYGON_MODE_FILL)
prim = PIPE_PRIM_TRIANGLE_STRIP;
if (prim != brw->primitive) {
brw->primitive = prim;
brw->state.dirty.brw |= BRW_NEW_PRIMITIVE;
if (u_reduced_prim(prim) != brw->reduced_primitive) {
brw->reduced_primitive = u_reduced_prim(prim);
brw->state.dirty.brw |= BRW_NEW_REDUCED_PRIMITIVE;
}
brw_validate_state(brw);
}
}
static unsigned trim(int prim, unsigned length)
{
if (prim == PIPE_PRIM_QUAD_STRIP)
return length > 3 ? (length - length % 2) : 0;
else if (prim == PIPE_PRIM_QUADS)
return length - length % 4;
else
return length;
}
static boolean brw_emit_prim( struct brw_context *brw,
boolean indexed,
unsigned start,
unsigned count )
{
struct brw_3d_primitive prim_packet;
if (BRW_DEBUG & DEBUG_PRIMS)
PRINT("PRIM: %d %d %d\n", brw->primitive, start, count);
prim_packet.header.opcode = CMD_3D_PRIM;
prim_packet.header.length = sizeof(prim_packet)/4 - 2;
prim_packet.header.pad = 0;
prim_packet.header.topology = hw_prim[brw->primitive];
prim_packet.header.indexed = indexed;
prim_packet.verts_per_instance = trim(brw->primitive, count);
prim_packet.start_vert_location = start;
prim_packet.instance_count = 1;
prim_packet.start_instance_location = 0;
prim_packet.base_vert_location = 0;
if (prim_packet.verts_per_instance == 0)
return TRUE;
return brw_batchbuffer_data( brw->winsys,
&prim_packet,
sizeof(prim_packet) );
}
/* May fail if out of video memory for texture or vbo upload, or on
* fallback conditions.
*/
static boolean brw_try_draw_elements( struct pipe_context *pipe,
struct pipe_buffer *index_buffer,
unsigned index_size,
unsigned mode,
unsigned start,
unsigned count )
{
struct brw_context *brw = brw_context(pipe);
/* Set the first primitive ahead of validate_state:
*/
brw_set_prim(brw, mode);
/* Upload index, vertex data:
*/
if (index_buffer &&
!brw_upload_indices( brw, index_buffer, index_size, start, count ))
return FALSE;
if (!brw_upload_vertex_buffers(brw))
return FALSE;
if (!brw_upload_vertex_elements( brw ))
return FALSE;
/* XXX: Need to separate validate and upload of state.
*/
if (brw->state.dirty.brw)
brw_validate_state( brw );
if (!brw_emit_prim(brw, index_buffer != NULL,
start, count))
return FALSE;
return TRUE;
}
static boolean brw_draw_elements( struct pipe_context *pipe,
struct pipe_buffer *indexBuffer,
unsigned indexSize,
unsigned mode,
unsigned start,
unsigned count )
{
if (!brw_try_draw_elements( pipe,
indexBuffer,
indexSize,
mode, start, count ))
{
/* flush ? */
if (!brw_try_draw_elements( pipe,
indexBuffer,
indexSize,
mode, start,
count )) {
assert(0);
return FALSE;
}
}
return TRUE;
}
static boolean brw_draw_arrays( struct pipe_context *pipe,
unsigned mode,
unsigned start,
unsigned count )
{
if (!brw_try_draw_elements( pipe, NULL, 0, mode, start, count )) {
/* flush ? */
if (!brw_try_draw_elements( pipe, NULL, 0, mode, start, count )) {
assert(0);
return FALSE;
}
}
return TRUE;
}
void brw_init_draw_functions( struct brw_context *brw )
{
brw->pipe.draw_arrays = brw_draw_arrays;
brw->pipe.draw_elements = brw_draw_elements;
}
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