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/*
* Copyright © 2012 Intel Corporation
*
* 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 (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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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:
* Jordan Justen <jordan.l.justen@intel.com>
*
*/
#include "main/imports.h"
#include "main/bufferobj.h"
#include "brw_context.h"
#include "brw_draw.h"
/**
* Check if the hardware's cut index support can handle the primitive
* restart index value.
*/
static bool
can_cut_index_handle_restart_index(struct gl_context *ctx,
const struct _mesa_index_buffer *ib)
{
bool cut_index_will_work;
switch (ib->type) {
case GL_UNSIGNED_BYTE:
cut_index_will_work = (ctx->Array.RestartIndex & 0xff) == 0xff;
break;
case GL_UNSIGNED_SHORT:
cut_index_will_work = (ctx->Array.RestartIndex & 0xffff) == 0xffff;
break;
case GL_UNSIGNED_INT:
cut_index_will_work = ctx->Array.RestartIndex == 0xffffffff;
break;
default:
cut_index_will_work = false;
assert(0);
}
return cut_index_will_work;
}
/**
* Check if the hardware's cut index support can handle the primitive
* restart case.
*/
static bool
can_cut_index_handle_prims(struct gl_context *ctx,
const struct _mesa_prim *prim,
GLuint nr_prims,
const struct _mesa_index_buffer *ib)
{
if (!can_cut_index_handle_restart_index(ctx, ib)) {
/* The primitive restart index can't be handled, so take
* the software path
*/
return false;
}
for ( ; nr_prims > 0; nr_prims--) {
switch(prim->mode) {
case GL_POINTS:
case GL_LINES:
case GL_LINE_STRIP:
case GL_TRIANGLES:
case GL_TRIANGLE_STRIP:
/* Cut index supports these primitive types */
break;
default:
/* Cut index does not support these primitive types */
//case GL_LINE_LOOP:
//case GL_TRIANGLE_FAN:
//case GL_QUADS:
//case GL_QUAD_STRIP:
//case GL_POLYGON:
return false;
}
}
return true;
}
/**
* Check if primitive restart is enabled, and if so, handle it properly.
*
* In some cases the support will be handled in software. When available
* hardware will handle primitive restart.
*/
GLboolean
brw_handle_primitive_restart(struct gl_context *ctx,
const struct _mesa_prim *prim,
GLuint nr_prims,
const struct _mesa_index_buffer *ib)
{
struct brw_context *brw = brw_context(ctx);
/* We only need to handle cases where there is an index buffer. */
if (ib == NULL) {
return GL_FALSE;
}
/* If the driver has requested software handling of primitive restarts,
* then the VBO module has already taken care of things, and we can
* just draw as normal.
*/
if (ctx->Const.PrimitiveRestartInSoftware) {
return GL_FALSE;
}
/* If we have set the in_progress flag, then we are in the middle
* of handling the primitive restart draw.
*/
if (brw->prim_restart.in_progress) {
return GL_FALSE;
}
/* If PrimitiveRestart is not enabled, then we aren't concerned about
* handling this draw.
*/
if (!(ctx->Array.PrimitiveRestart)) {
return GL_FALSE;
}
/* Signal that we are in the process of handling the
* primitive restart draw
*/
brw->prim_restart.in_progress = true;
if (can_cut_index_handle_prims(ctx, prim, nr_prims, ib)) {
/* Cut index should work for primitive restart, so use it
*/
brw->prim_restart.enable_cut_index = true;
brw_draw_prims(ctx, prim, nr_prims, ib, GL_FALSE, -1, -1, NULL);
brw->prim_restart.enable_cut_index = false;
} else {
/* Not all the primitive draw modes are supported by the cut index,
* so take the software path
*/
vbo_sw_primitive_restart(ctx, prim, nr_prims, ib);
}
brw->prim_restart.in_progress = false;
/* The primitive restart draw was completed, so return true. */
return GL_TRUE;
}
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