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/*
* Copyright (c) 2008-2024 Broadcom. All Rights Reserved.
* The term “Broadcom” refers to Broadcom Inc.
* and/or its subsidiaries.
* SPDX-License-Identifier: MIT
*/
#ifndef SVGA_DRAW_H_
#define SVGA_DRAW_H_
#include "util/compiler.h"
#include "pipe/p_defines.h"
#include "indices/u_indices.h"
#include "util/u_prim.h"
#include "svga_context.h"
#include "svga_hw_reg.h"
#include "svga3d_shaderdefs.h"
struct svga_context;
struct u_upload_mgr;
/**
* Mask indicating which types of gallium primitives are actually
* handled by the svga device. Other types will be converted to
* these types by the index/translation code.
*/
static const unsigned svga_hw_prims =
((1 << MESA_PRIM_POINTS) |
(1 << MESA_PRIM_LINES) |
(1 << MESA_PRIM_LINE_STRIP) |
(1 << MESA_PRIM_TRIANGLES) |
(1 << MESA_PRIM_TRIANGLE_STRIP) |
(1 << MESA_PRIM_TRIANGLE_FAN) |
(1 << MESA_PRIM_LINES_ADJACENCY) |
(1 << MESA_PRIM_LINE_STRIP_ADJACENCY) |
(1 << MESA_PRIM_TRIANGLES_ADJACENCY) |
(1 << MESA_PRIM_TRIANGLE_STRIP_ADJACENCY) |
(1 << MESA_PRIM_PATCHES));
/**
* Translate a gallium MESA_PRIM_x value to an SVGA3D_PRIMITIVE_x value.
* Also, compute the number of primitives that'll be drawn given a
* vertex count.
* Note that this function doesn't have to handle MESA_PRIM_LINE_LOOP,
* MESA_PRIM_QUADS, MESA_PRIM_QUAD_STRIP or MESA_PRIM_POLYGON. We convert
* those to other types of primitives with index/translation code.
*/
static inline SVGA3dPrimitiveType
svga_translate_prim(unsigned mode, unsigned vcount, unsigned *prim_count,
uint8_t vertices_per_patch)
{
switch (mode) {
case MESA_PRIM_POINTS:
*prim_count = vcount;
return SVGA3D_PRIMITIVE_POINTLIST;
case MESA_PRIM_LINES:
*prim_count = vcount / 2;
return SVGA3D_PRIMITIVE_LINELIST;
case MESA_PRIM_LINE_STRIP:
*prim_count = vcount - 1;
return SVGA3D_PRIMITIVE_LINESTRIP;
case MESA_PRIM_TRIANGLES:
*prim_count = vcount / 3;
return SVGA3D_PRIMITIVE_TRIANGLELIST;
case MESA_PRIM_TRIANGLE_STRIP:
*prim_count = vcount - 2;
return SVGA3D_PRIMITIVE_TRIANGLESTRIP;
case MESA_PRIM_TRIANGLE_FAN:
*prim_count = vcount - 2;
return SVGA3D_PRIMITIVE_TRIANGLEFAN;
case MESA_PRIM_LINES_ADJACENCY:
*prim_count = vcount / 4;
return SVGA3D_PRIMITIVE_LINELIST_ADJ;
case MESA_PRIM_LINE_STRIP_ADJACENCY:
*prim_count = vcount - 3;
return SVGA3D_PRIMITIVE_LINESTRIP_ADJ;
case MESA_PRIM_TRIANGLES_ADJACENCY:
*prim_count = vcount / 6;
return SVGA3D_PRIMITIVE_TRIANGLELIST_ADJ;
case MESA_PRIM_TRIANGLE_STRIP_ADJACENCY:
*prim_count = vcount / 2 - 2 ;
return SVGA3D_PRIMITIVE_TRIANGLESTRIP_ADJ;
case MESA_PRIM_PATCHES:
*prim_count = vcount / vertices_per_patch ;
assert(vertices_per_patch >= 1);
assert(vertices_per_patch <= 32);
return (SVGA3D_PRIMITIVE_1_CONTROL_POINT_PATCH - 1)
+ vertices_per_patch;
default:
assert(0);
*prim_count = 0;
return 0;
}
}
struct index_cache {
u_generate_func generate;
unsigned gen_nr;
/* If non-null, this buffer is filled by calling generate(nr, map(buffer))
*/
struct pipe_resource *buffer;
};
/** Max number of primitives per draw call */
#define QSZ SVGA3D_MAX_DRAW_PRIMITIVE_RANGES
struct draw_cmd {
struct svga_winsys_context *swc;
/* vertex layout info */
SVGA3dVertexDecl vdecl[SVGA3D_INPUTREG_MAX];
unsigned vdecl_count;
SVGA3dElementLayoutId vdecl_layout_id;
unsigned vdecl_buffer_index[SVGA3D_INPUTREG_MAX];
/* vertex buffer info */
struct pipe_vertex_buffer vbufs[SVGA3D_INPUTREG_MAX];
unsigned vbuf_count;
SVGA3dPrimitiveRange prim[QSZ];
struct pipe_resource *prim_ib[QSZ];
unsigned prim_count; /**< number of primitives for this draw */
unsigned min_index[QSZ];
unsigned max_index[QSZ];
};
#define IDX_CACHE_MAX 8
struct svga_hwtnl {
struct svga_context *svga;
struct u_upload_mgr *upload_ib;
/* Additional negative index bias due to partial buffer uploads
* This is compensated for in the offset associated with all
* vertex buffers.
*/
int index_bias;
/* Provoking vertex information (for flat shading). */
unsigned api_pv; /**< app-requested PV mode (PV_FIRST or PV_LAST) */
unsigned hw_pv; /**< device-supported PV mode (PV_FIRST or PV_LAST) */
/* The triangle fillmode for the device (one of PIPE_POLYGON_MODE_{FILL,
* LINE,POINT}). If the polygon front mode matches the back mode,
* api_fillmode will be that mode. Otherwise, api_fillmode will be
* PIPE_POLYGON_MODE_FILL.
*/
unsigned api_fillmode;
/* Cache the results of running a particular generate func on each
* primitive type.
*/
struct index_cache index_cache[MESA_PRIM_COUNT][IDX_CACHE_MAX];
/* Try to build the maximal draw command packet before emitting:
*/
struct draw_cmd cmd;
};
/**
* Do we need to use the gallium 'indices' helper to render unfilled
* triangles?
*/
static inline bool
svga_need_unfilled_fallback(const struct svga_hwtnl *hwtnl,
enum mesa_prim prim)
{
if (u_reduced_prim(prim) != MESA_PRIM_TRIANGLES) {
/* if we're drawing points or lines, no fallback needed */
return false;
}
if ((prim == MESA_PRIM_QUADS ||
prim == MESA_PRIM_QUAD_STRIP ||
prim == MESA_PRIM_POLYGON) &&
hwtnl->api_fillmode == PIPE_POLYGON_MODE_LINE) {
/* We can't directly render quads or polygons. They're
* converted to triangles. If we let the device draw the triangle
* outlines we'll get an extra, stray lines in the interiors.
* So, to draw unfilled quads correctly, we need the fallback.
*/
return true;
}
return false;
}
enum pipe_error
svga_hwtnl_prim(struct svga_hwtnl *hwtnl,
const SVGA3dPrimitiveRange *range,
unsigned vcount,
unsigned min_index,
unsigned max_index,
struct pipe_resource *ib,
unsigned start_instance, unsigned instance_count,
const struct pipe_draw_indirect_info *indirect,
const struct pipe_stream_output_target *so_vertex_count);
enum pipe_error
svga_hwtnl_simple_draw_range_elements(struct svga_hwtnl *hwtnl,
struct pipe_resource *indexBuffer,
unsigned index_size,
int index_bias,
unsigned min_index,
unsigned max_index,
enum mesa_prim prim,
unsigned start,
unsigned count,
unsigned start_instance,
unsigned instance_count,
uint8_t vertices_per_patch);
#endif
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