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/**************************************************************************
*
* Copyright 2007 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.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
#include "pipe/p_util.h"
#include "draw_context.h"
#include "draw_private.h"
struct draw_context *draw_create( void )
{
struct draw_context *draw = CALLOC_STRUCT( draw_context );
/* create pipeline stages */
draw->pipeline.unfilled = draw_unfilled_stage( draw );
draw->pipeline.twoside = draw_twoside_stage( draw );
draw->pipeline.offset = draw_offset_stage( draw );
draw->pipeline.clip = draw_clip_stage( draw );
draw->pipeline.flatshade = draw_flatshade_stage( draw );
draw->pipeline.cull = draw_cull_stage( draw );
ASSIGN_4V( draw->plane[0], -1, 0, 0, 1 );
ASSIGN_4V( draw->plane[1], 1, 0, 0, 1 );
ASSIGN_4V( draw->plane[2], 0, -1, 0, 1 );
ASSIGN_4V( draw->plane[3], 0, 1, 0, 1 );
ASSIGN_4V( draw->plane[4], 0, 0, 1, 1 ); /* yes these are correct */
ASSIGN_4V( draw->plane[5], 0, 0, -1, 1 ); /* mesa's a bit wonky */
draw->nr_planes = 6;
/* Statically allocate maximum sized vertices for the cache - could be cleverer...
*/
{
int i;
char *tmp = malloc(Elements(draw->vcache.vertex) * MAX_VERTEX_SIZE);
for (i = 0; i < Elements(draw->vcache.vertex); i++)
draw->vcache.vertex[i] = (struct vertex_header *)(tmp + i * MAX_VERTEX_SIZE);
}
draw->attrib_front0 = -1;
draw->attrib_back0 = -1;
draw->attrib_front1 = -1;
draw->attrib_back1 = -1;
return draw;
}
void draw_destroy( struct draw_context *draw )
{
free( draw->vcache.vertex[0] ); /* Frees all the vertices. */
free( draw );
}
/**
* Rebuild the rendering pipeline.
*/
static void validate_pipeline( struct draw_context *draw )
{
struct draw_stage *next = draw->pipeline.setup;
/*
* NOTE: we build up the pipeline in end-to-start order.
*
* TODO: make the current primitive part of the state and build
* shorter pipelines for lines & points.
*/
if (draw->setup.fill_cw != PIPE_POLYGON_MODE_FILL ||
draw->setup.fill_ccw != PIPE_POLYGON_MODE_FILL) {
draw->pipeline.unfilled->next = next;
next = draw->pipeline.unfilled;
}
if (draw->setup.offset_cw ||
draw->setup.offset_ccw) {
draw->pipeline.offset->next = next;
next = draw->pipeline.offset;
}
if (draw->setup.light_twoside) {
draw->pipeline.twoside->next = next;
next = draw->pipeline.twoside;
}
/* Always run the cull stage as we calculate determinant there
* also. Fix this..
*/
{
draw->pipeline.cull->next = next;
next = draw->pipeline.cull;
}
/* Clip stage
*/
{
draw->pipeline.clip->next = next;
next = draw->pipeline.clip;
}
/* Do software flatshading prior to clipping. XXX: should only do
* this for clipped primitives, ie it is a part of the clip
* routine.
*/
if (draw->setup.flatshade) {
draw->pipeline.flatshade->next = next;
next = draw->pipeline.flatshade;
}
draw->pipeline.first = next;
}
/**
* Register new primitive setup/rendering state.
* This causes the drawing pipeline to be rebuilt.
*/
void draw_set_setup_state( struct draw_context *draw,
const struct pipe_setup_state *setup )
{
draw->setup = *setup; /* struct copy */
validate_pipeline( draw );
}
/**
* Plug in the primitive rendering/rasterization stage.
* This is provided by the device driver.
*/
void draw_set_setup_stage( struct draw_context *draw,
struct draw_stage *stage )
{
draw->pipeline.setup = stage;
}
/**
* Set the draw module's clipping state.
*/
void draw_set_clip_state( struct draw_context *draw,
const struct pipe_clip_state *clip )
{
assert(clip->nr <= PIPE_MAX_CLIP_PLANES);
memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
draw->nr_planes = 6 + clip->nr;
/* bitmask of the enabled user-defined clip planes */
draw->user_clipmask = ((1 << clip->nr) - 1) << 6;
}
/**
* Set the draw module's viewport state.
*/
void draw_set_viewport_state( struct draw_context *draw,
const struct pipe_viewport_state *viewport )
{
draw->viewport = *viewport; /* struct copy */
}
void
draw_set_vertex_buffer(struct draw_context *draw,
unsigned attr,
const struct pipe_vertex_buffer *buffer)
{
assert(attr < PIPE_ATTRIB_MAX);
draw->vertex_buffer[attr] = *buffer;
}
void
draw_set_vertex_element(struct draw_context *draw,
unsigned attr,
const struct pipe_vertex_element *element)
{
assert(attr < PIPE_ATTRIB_MAX);
draw->vertex_element[attr] = *element;
}
void
draw_set_vertex_shader(struct draw_context *draw,
const struct pipe_shader_state *shader)
{
draw->vertex_shader = *shader;
}
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