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draw/softpipe: add clip vertex support. (v2) 

softpipe always clipped using the position vector, however for unclipped
vertices it stored the position in window coordinates, however when position
and clipping are separated, we need to store the clip-space position and
the clip-space vertex clip, so we can interpolate both separately.

This means we have to take the clip space position and store it to use later.

This allows softpipe to pass all the clip-vertex piglit tests.

v2: fix llvm draw regression, the structure being passed into llvm needed
updating, remove some hardcoded ints that should have been enums while there.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2012-01-04 11:52:30 +00:00
parent 34a78b7ef6
commit 40c5987ed8
9 changed files with 58 additions and 18 deletions
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17
src/gallium/auxiliary/draw/draw_cliptest_tmp.h
View File

@ -35,11 +35,13 @@ static boolean TAG(do_cliptest)( struct pt_post_vs *pvs,
const float *trans = pvs->draw->viewport.translate;
/* const */ float (*plane)[4] = pvs->draw->plane;
const unsigned pos = draw_current_shader_position_output(pvs->draw);
const unsigned cv = draw_current_shader_clipvertex_output(pvs->draw);
const unsigned ef = pvs->draw->vs.edgeflag_output;
const unsigned ucp_enable = pvs->draw->rasterizer->clip_plane_enable;
const unsigned flags = (FLAGS);
unsigned need_pipeline = 0;
unsigned j;
unsigned i;
for (j = 0; j < info->count; j++) {
float *position = out->data[pos];
@ -49,10 +51,15 @@ static boolean TAG(do_cliptest)( struct pt_post_vs *pvs,
if (flags & (DO_CLIP_XY | DO_CLIP_XY_GUARD_BAND |
DO_CLIP_FULL_Z | DO_CLIP_HALF_Z | DO_CLIP_USER)) {
out->clip[0] = position[0];
out->clip[1] = position[1];
out->clip[2] = position[2];
out->clip[3] = position[3];
float *clipvertex = position;
if ((flags & DO_CLIP_USER) && cv != pos)
clipvertex = out->data[cv];
for (i = 0; i < 4; i++) {
out->clip[i] = clipvertex[i];
out->pre_clip_pos[i] = position[i];
}
/* Do the hardwired planes first:
*/
@ -88,7 +95,7 @@ static boolean TAG(do_cliptest)( struct pt_post_vs *pvs,
ucp_mask &= ~(1 << plane_idx);
plane_idx += 6;
if (dot4(position, plane[plane_idx]) < 0) {
if (dot4(clipvertex, plane[plane_idx]) < 0) {
mask |= 1 << plane_idx;
}
}

10
src/gallium/auxiliary/draw/draw_context.c
View File

@ -691,6 +691,16 @@ draw_current_shader_position_output(const struct draw_context *draw)
}
/**
* Return the index of the shader output which will contain the
* vertex position.
*/
uint
draw_current_shader_clipvertex_output(const struct draw_context *draw)
{
return draw->vs.clipvertex_output;
}
/**
* Return a pointer/handle for a driver/CSO rasterizer object which
* disabled culling, stippling, unfilled tris, etc.

12
src/gallium/auxiliary/draw/draw_llvm.c
View File

@ -268,15 +268,16 @@ static LLVMTypeRef
create_jit_vertex_header(struct gallivm_state *gallivm, int data_elems)
{
LLVMTargetDataRef target = gallivm->target;
LLVMTypeRef elem_types[3];
LLVMTypeRef elem_types[4];
LLVMTypeRef vertex_header;
char struct_name[24];
util_snprintf(struct_name, 23, "vertex_header%d", data_elems);
elem_types[0] = LLVMIntTypeInContext(gallivm->context, 32);
elem_types[1] = LLVMArrayType(LLVMFloatTypeInContext(gallivm->context), 4);
elem_types[2] = LLVMArrayType(elem_types[1], data_elems);
elem_types[DRAW_JIT_VERTEX_VERTEX_ID] = LLVMIntTypeInContext(gallivm->context, 32);
elem_types[DRAW_JIT_VERTEX_CLIP] = LLVMArrayType(LLVMFloatTypeInContext(gallivm->context), 4);
elem_types[DRAW_JIT_VERTEX_PRE_CLIP_POS] = LLVMArrayType(LLVMFloatTypeInContext(gallivm->context), 4);
elem_types[DRAW_JIT_VERTEX_DATA] = LLVMArrayType(elem_types[1], data_elems);
#if HAVE_LLVM >= 0x0300
vertex_header = LLVMStructCreateNamed(gallivm->context, struct_name);
@ -307,6 +308,9 @@ create_jit_vertex_header(struct gallivm_state *gallivm, int data_elems)
LP_CHECK_MEMBER_OFFSET(struct vertex_header, clip,
target, vertex_header,
DRAW_JIT_VERTEX_CLIP);
LP_CHECK_MEMBER_OFFSET(struct vertex_header, pre_clip_pos,
target, vertex_header,
DRAW_JIT_VERTEX_PRE_CLIP_POS);
LP_CHECK_MEMBER_OFFSET(struct vertex_header, data,
target, vertex_header,
DRAW_JIT_VERTEX_DATA);

10
src/gallium/auxiliary/draw/draw_llvm.h
View File

@ -80,6 +80,7 @@ enum {
enum {
DRAW_JIT_VERTEX_VERTEX_ID = 0,
DRAW_JIT_VERTEX_CLIP,
DRAW_JIT_VERTEX_PRE_CLIP_POS,
DRAW_JIT_VERTEX_DATA
};
@ -123,13 +124,16 @@ struct draw_jit_context
lp_build_struct_get_ptr(_gallivm, _ptr, DRAW_JIT_CTX_TEXTURES, "textures")
#define draw_jit_header_id(_gallivm, _ptr) \
lp_build_struct_get_ptr(_gallivm, _ptr, 0, "id")
lp_build_struct_get_ptr(_gallivm, _ptr, DRAW_JIT_VERTEX_VERTEX_ID, "id")
#define draw_jit_header_clip(_gallivm, _ptr) \
lp_build_struct_get_ptr(_gallivm, _ptr, 1, "clip")
lp_build_struct_get_ptr(_gallivm, _ptr, DRAW_JIT_VERTEX_CLIP, "clip")
#define draw_jit_header_pre_clip_pos(_gallivm, _ptr) \
lp_build_struct_get_ptr(_gallivm, _ptr, DRAW_JIT_VERTEX_PRE_CLIP_POS, "pre_clip_pos")
#define draw_jit_header_data(_gallivm, _ptr) \
lp_build_struct_get_ptr(_gallivm, _ptr, 2, "data")
lp_build_struct_get_ptr(_gallivm, _ptr, DRAW_JIT_VERTEX_DATA, "data")
#define draw_jit_vbuffer_stride(_gallivm, _ptr) \

9
src/gallium/auxiliary/draw/draw_pipe_clip.c
View File

@ -118,6 +118,7 @@ static void interp( const struct clip_stage *clip,
{
const unsigned nr_attrs = draw_current_shader_outputs(clip->stage.draw);
const unsigned pos_attr = draw_current_shader_position_output(clip->stage.draw);
const unsigned clip_attr = draw_current_shader_clipvertex_output(clip->stage.draw);
unsigned j;
/* Vertex header.
@ -130,12 +131,14 @@ static void interp( const struct clip_stage *clip,
/* Interpolate the clip-space coords.
*/
interp_attr(dst->clip, t, in->clip, out->clip);
/* interpolate the clip-space position */
interp_attr(dst->pre_clip_pos, t, in->pre_clip_pos, out->pre_clip_pos);
/* Do the projective divide and viewport transformation to get
* new window coordinates:
*/
{
const float *pos = dst->clip;
const float *pos = dst->pre_clip_pos;
const float *scale = clip->stage.draw->viewport.scale;
const float *trans = clip->stage.draw->viewport.translate;
const float oow = 1.0f / pos[3];
@ -149,8 +152,8 @@ static void interp( const struct clip_stage *clip,
/* Other attributes
*/
for (j = 0; j < nr_attrs; j++) {
if (j != pos_attr)
interp_attr(dst->data[j], t, in->data[j], out->data[j]);
if (j != pos_attr && j != clip_attr)
interp_attr(dst->data[j], t, in->data[j], out->data[j]);
}
}

4
src/gallium/auxiliary/draw/draw_private.h
View File

@ -76,6 +76,7 @@ struct vertex_header {
unsigned vertex_id:16;
float clip[4];
float pre_clip_pos[4];
/* This will probably become float (*data)[4] soon:
*/
@ -230,6 +231,7 @@ struct draw_context
uint num_vs_outputs; /**< convenience, from vertex_shader */
uint position_output;
uint edgeflag_output;
uint clipvertex_output;
/** TGSI program interpreter runtime state */
struct tgsi_exec_machine *machine;
@ -378,7 +380,7 @@ void draw_gs_destroy( struct draw_context *draw );
*/
uint draw_current_shader_outputs(const struct draw_context *draw);
uint draw_current_shader_position_output(const struct draw_context *draw);
uint draw_current_shader_clipvertex_output(const struct draw_context *draw);
int draw_alloc_extra_vertex_attrib(struct draw_context *draw,
uint semantic_name, uint semantic_index);
void draw_remove_extra_vertex_attribs(struct draw_context *draw);

4
src/gallium/auxiliary/draw/draw_pt_fetch.c
View File

@ -74,9 +74,9 @@ draw_pt_fetch_prepare(struct pt_fetch *fetch,
/* Leave the clipmask/edgeflags/pad/vertex_id untouched
*/
dst_offset += 1 * sizeof(float);
/* Just leave the clip[] array untouched.
/* Just leave the clip[] and pre_clip_pos[] array untouched.
*/
dst_offset += 4 * sizeof(float);
dst_offset += 8 * sizeof(float);
if (instance_id_index != ~0) {
num_extra_inputs++;

9
src/gallium/auxiliary/draw/draw_vs.c
View File

@ -120,6 +120,7 @@ draw_create_vertex_shader(struct draw_context *draw,
if (vs)
{
uint i;
bool found_clipvertex = FALSE;
for (i = 0; i < vs->info.num_outputs; i++) {
if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_POSITION &&
vs->info.output_semantic_index[i] == 0)
@ -127,7 +128,14 @@ draw_create_vertex_shader(struct draw_context *draw,
else if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_EDGEFLAG &&
vs->info.output_semantic_index[i] == 0)
vs->edgeflag_output = i;
else if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_CLIPVERTEX &&
vs->info.output_semantic_index[i] == 0) {
found_clipvertex = TRUE;
vs->clipvertex_output = i;
}
}
if (!found_clipvertex)
vs->clipvertex_output = vs->position_output;
}
assert(vs);
@ -147,6 +155,7 @@ draw_bind_vertex_shader(struct draw_context *draw,
draw->vs.num_vs_outputs = dvs->info.num_outputs;
draw->vs.position_output = dvs->position_output;
draw->vs.edgeflag_output = dvs->edgeflag_output;
draw->vs.clipvertex_output = dvs->clipvertex_output;
dvs->prepare( dvs, draw );
}
else {

1
src/gallium/auxiliary/draw/draw_vs.h
View File

@ -111,6 +111,7 @@ struct draw_vertex_shader {
struct tgsi_shader_info info;
unsigned position_output;
unsigned edgeflag_output;
unsigned clipvertex_output;
/* Extracted from shader:
*/