/**
* Handle primitive restart in software.
*
* This function breaks up calls into the driver so primitive restart
* support is not required in the driver.
*/
void
vbo_sw_primitive_restart(struct gl_context *ctx,
const struct _mesa_prim *prims,
GLuint nr_prims,
const struct _mesa_index_buffer *ib,
struct gl_buffer_object *indirect)
{
GLuint prim_num;
struct _mesa_prim new_prim;
struct _mesa_index_buffer new_ib;
struct sub_primitive *sub_prims;
struct sub_primitive *sub_prim;
GLuint num_sub_prims;
GLuint sub_prim_num;
GLuint end_index;
GLuint sub_end_index;
GLuint restart_index = _mesa_primitive_restart_index(ctx, ib->index_size);
struct _mesa_prim temp_prim;
struct vbo_context *vbo = vbo_context(ctx);
vbo_draw_func draw_prims_func = vbo->draw_prims;
GLboolean map_ib = ib->obj->Name && !ib->obj->Mappings[MAP_INTERNAL].Pointer;
void *ptr;
/* If there is an indirect buffer, map it and extract the draw params */
if (indirect && prims[0].is_indirect) {
const uint32_t *indirect_params;
if (!ctx->Driver.MapBufferRange(ctx, 0, indirect->Size, GL_MAP_READ_BIT,
indirect, MAP_INTERNAL)) {
/* something went wrong with mapping, give up */
_mesa_error(ctx, GL_OUT_OF_MEMORY,
"failed to map indirect buffer for sw primitive restart");
return;
}
assert(nr_prims == 1);
new_prim = prims[0];
indirect_params = (const uint32_t *)
ADD_POINTERS(indirect->Mappings[MAP_INTERNAL].Pointer,
new_prim.indirect_offset);
new_prim.is_indirect = 0;
new_prim.count = indirect_params[0];
new_prim.num_instances = indirect_params[1];
new_prim.start = indirect_params[2];
new_prim.basevertex = indirect_params[3];
new_prim.base_instance = indirect_params[4];
new_ib = *ib;
new_ib.count = new_prim.count;
prims = &new_prim;
ib = &new_ib;
ctx->Driver.UnmapBuffer(ctx, indirect, MAP_INTERNAL);
}
/* Find the sub-primitives. These are regions in the index buffer which
* are split based on the primitive restart index value.
*/
if (map_ib) {
ctx->Driver.MapBufferRange(ctx, 0, ib->obj->Size, GL_MAP_READ_BIT,
ib->obj, MAP_INTERNAL);
}
ptr = ADD_POINTERS(ib->obj->Mappings[MAP_INTERNAL].Pointer, ib->ptr);
sub_prims = find_sub_primitives(ptr, ib->index_size,
0, ib->count, restart_index,
&num_sub_prims);
if (map_ib) {
ctx->Driver.UnmapBuffer(ctx, ib->obj, MAP_INTERNAL);
}
/* Loop over the primitives, and use the located sub-primitives to draw
* each primitive with a break to implement each primitive restart.
*/
for (prim_num = 0; prim_num < nr_prims; prim_num++) {
end_index = prims[prim_num].start + prims[prim_num].count;
memcpy(&temp_prim, &prims[prim_num], sizeof (temp_prim));
/* Loop over the sub-primitives drawing sub-ranges of the primitive. */
for (sub_prim_num = 0; sub_prim_num < num_sub_prims; sub_prim_num++) {
sub_prim = &sub_prims[sub_prim_num];
sub_end_index = sub_prim->start + sub_prim->count;
if (prims[prim_num].start <= sub_prim->start) {
temp_prim.start = MAX2(prims[prim_num].start, sub_prim->start);
temp_prim.count = MIN2(sub_end_index, end_index) - temp_prim.start;
if ((temp_prim.start == sub_prim->start) &&
(temp_prim.count == sub_prim->count)) {
draw_prims_func(ctx, &temp_prim, 1, ib,
GL_TRUE, sub_prim->min_index, sub_prim->max_index,
NULL, 0, NULL);
} else {
draw_prims_func(ctx, &temp_prim, 1, ib,
GL_FALSE, -1, -1,
NULL, 0, NULL);
}
}
if (sub_end_index >= end_index) {
break;
}
}
}
free(sub_prims);
}
/**
* Handle primitive restart in software.
*
* This function breaks up calls into the driver so primitive restart
* support is not required in the driver.
*/
void
vbo_sw_primitive_restart(struct gl_context *ctx,
const struct _mesa_prim *prims,
GLuint nr_prims,
const struct _mesa_index_buffer *ib)
{
GLuint prim_num;
struct sub_primitive *sub_prims;
struct sub_primitive *sub_prim;
GLuint num_sub_prims;
GLuint sub_prim_num;
GLuint end_index;
GLuint sub_end_index;
GLuint restart_index = ctx->Array.RestartIndex;
struct _mesa_prim temp_prim;
struct vbo_context *vbo = vbo_context(ctx);
vbo_draw_func draw_prims_func = vbo->draw_prims;
GLboolean map_ib = ib->obj->Name && !ib->obj->Pointer;
void *ptr;
/* Find the sub-primitives. These are regions in the index buffer which
* are split based on the primitive restart index value.
*/
if (map_ib) {
ctx->Driver.MapBufferRange(ctx, 0, ib->obj->Size, GL_MAP_READ_BIT,
ib->obj);
}
ptr = ADD_POINTERS(ib->obj->Pointer, ib->ptr);
sub_prims = find_sub_primitives(ptr, vbo_sizeof_ib_type(ib->type),
0, ib->count, restart_index,
&num_sub_prims);
if (map_ib) {
ctx->Driver.UnmapBuffer(ctx, ib->obj);
}
/* Loop over the primitives, and use the located sub-primitives to draw
* each primitive with a break to implement each primitive restart.
*/
for (prim_num = 0; prim_num < nr_prims; prim_num++) {
end_index = prims[prim_num].start + prims[prim_num].count;
memcpy(&temp_prim, &prims[prim_num], sizeof (temp_prim));
/* Loop over the sub-primitives drawing sub-ranges of the primitive. */
for (sub_prim_num = 0; sub_prim_num < num_sub_prims; sub_prim_num++) {
sub_prim = &sub_prims[sub_prim_num];
sub_end_index = sub_prim->start + sub_prim->count;
if (prims[prim_num].start <= sub_prim->start) {
temp_prim.start = MAX2(prims[prim_num].start, sub_prim->start);
temp_prim.count = MIN2(sub_end_index, end_index) - temp_prim.start;
if ((temp_prim.start == sub_prim->start) &&
(temp_prim.count == sub_prim->count)) {
draw_prims_func(ctx, &temp_prim, 1, ib,
GL_TRUE, sub_prim->min_index, sub_prim->max_index,
NULL);
} else {
draw_prims_func(ctx, &temp_prim, 1, ib,
GL_FALSE, -1, -1,
NULL);
}
}
if (sub_end_index >= end_index) {
break;
}
}
}
free(sub_prims);
}