*/
-#include "pipe/p_util.h"
+#include "util/u_memory.h"
+#include "util/u_math.h"
+
#include "pipe/p_shader_tokens.h"
#include "draw_vs.h"
-struct clipper {
+struct clip_stage {
struct draw_stage stage; /**< base class */
/* Basically duplicate some of the flatshading logic here:
};
-/* This is a bit confusing:
- */
-static INLINE struct clipper *clipper_stage( struct draw_stage *stage )
+/** Cast wrapper */
+static INLINE struct clip_stage *clip_stage( struct draw_stage *stage )
{
- return (struct clipper *)stage;
+ return (struct clip_stage *)stage;
}
/* All attributes are float[4], so this is easy:
*/
-static void interp_attr( float *fdst,
+static void interp_attr( float dst[4],
float t,
- const float *fin,
- const float *fout )
+ const float in[4],
+ const float out[4] )
{
- fdst[0] = LINTERP( t, fout[0], fin[0] );
- fdst[1] = LINTERP( t, fout[1], fin[1] );
- fdst[2] = LINTERP( t, fout[2], fin[2] );
- fdst[3] = LINTERP( t, fout[3], fin[3] );
+ dst[0] = LINTERP( t, out[0], in[0] );
+ dst[1] = LINTERP( t, out[1], in[1] );
+ dst[2] = LINTERP( t, out[2], in[2] );
+ dst[3] = LINTERP( t, out[3], in[3] );
}
+
+/**
+ * Copy front/back, primary/secondary colors from src vertex to dst vertex.
+ * Used when flat shading.
+ */
static void copy_colors( struct draw_stage *stage,
struct vertex_header *dst,
const struct vertex_header *src )
{
- const struct clipper *clipper = clipper_stage(stage);
+ const struct clip_stage *clipper = clip_stage(stage);
uint i;
for (i = 0; i < clipper->num_color_attribs; i++) {
const uint attr = clipper->color_attribs[i];
/* Interpolate between two vertices to produce a third.
*/
-static void interp( const struct clipper *clip,
+static void interp( const struct clip_stage *clip,
struct vertex_header *dst,
float t,
const struct vertex_header *out,
const struct vertex_header *in )
{
- const unsigned nr_attrs = clip->stage.draw->num_vs_outputs;
+ const unsigned nr_attrs = draw_current_shader_outputs(clip->stage.draw);
+ const unsigned pos_attr = draw_current_shader_position_output(clip->stage.draw);
unsigned j;
/* Vertex header.
*/
- {
- dst->clipmask = 0;
- dst->edgeflag = 0;
- dst->pad = 0;
- dst->vertex_id = UNDEFINED_VERTEX_ID;
- }
+ dst->clipmask = 0;
+ dst->edgeflag = 0; /* will get overwritten later */
+ dst->pad = 0;
+ dst->vertex_id = UNDEFINED_VERTEX_ID;
- /* Clip coordinates: interpolate normally
+ /* Interpolate the clip-space coords.
*/
- {
- interp_attr(dst->clip, t, in->clip, out->clip);
- }
+ interp_attr(dst->clip, t, in->clip, out->clip);
- /* Do the projective divide and insert window coordinates:
+ /* Do the projective divide and viewport transformation to get
+ * new window coordinates:
*/
{
const float *pos = dst->clip;
const float *trans = clip->stage.draw->viewport.translate;
const float oow = 1.0f / pos[3];
- dst->data[0][0] = pos[0] * oow * scale[0] + trans[0];
- dst->data[0][1] = pos[1] * oow * scale[1] + trans[1];
- dst->data[0][2] = pos[2] * oow * scale[2] + trans[2];
- dst->data[0][3] = oow;
+ dst->data[pos_attr][0] = pos[0] * oow * scale[0] + trans[0];
+ dst->data[pos_attr][1] = pos[1] * oow * scale[1] + trans[1];
+ dst->data[pos_attr][2] = pos[2] * oow * scale[2] + trans[2];
+ dst->data[pos_attr][3] = oow;
}
/* Other attributes
- * Note: start at 1 to skip winpos (data[0]) since we just computed
- * it above.
*/
- for (j = 1; j < nr_attrs; j++) {
- interp_attr(dst->data[j], t, in->data[j], out->data[j]);
+ for (j = 0; j < nr_attrs; j++) {
+ if (j != pos_attr)
+ interp_attr(dst->data[j], t, in->data[j], out->data[j]);
}
}
+/**
+ * Emit a post-clip polygon to the next pipeline stage. The polygon
+ * will be convex and the provoking vertex will always be vertex[0].
+ */
static void emit_poly( struct draw_stage *stage,
struct vertex_header **inlist,
unsigned n,
{
struct prim_header header;
unsigned i;
+ ushort edge_first, edge_middle, edge_last;
+
+ if (stage->draw->rasterizer->flatshade_first) {
+ edge_first = DRAW_PIPE_EDGE_FLAG_0;
+ edge_middle = DRAW_PIPE_EDGE_FLAG_1;
+ edge_last = DRAW_PIPE_EDGE_FLAG_2;
+ }
+ else {
+ edge_first = DRAW_PIPE_EDGE_FLAG_2;
+ edge_middle = DRAW_PIPE_EDGE_FLAG_0;
+ edge_last = DRAW_PIPE_EDGE_FLAG_1;
+ }
/* later stages may need the determinant, but only the sign matters */
header.det = origPrim->det;
+ header.flags = DRAW_PIPE_RESET_STIPPLE | edge_first | edge_middle;
+ header.pad = 0;
+
+ for (i = 2; i < n; i++, header.flags = edge_middle) {
+ /* order the triangle verts to respect the provoking vertex mode */
+ if (stage->draw->rasterizer->flatshade_first) {
+ header.v[0] = inlist[0]; /* the provoking vertex */
+ header.v[1] = inlist[i-1];
+ header.v[2] = inlist[i];
+ }
+ else {
+ header.v[0] = inlist[i-1];
+ header.v[1] = inlist[i];
+ header.v[2] = inlist[0]; /* the provoking vertex */
+ }
- for (i = 2; i < n; i++) {
- header.v[0] = inlist[i-1];
- header.v[1] = inlist[i];
- header.v[2] = inlist[0]; /* keep in v[2] for flatshading */
-
- {
- unsigned tmp1 = header.v[1]->edgeflag;
- unsigned tmp2 = header.v[2]->edgeflag;
-
- if (i != n-1) header.v[1]->edgeflag = 0;
- if (i != 2) header.v[2]->edgeflag = 0;
-
- header.edgeflags = ((header.v[0]->edgeflag << 0) |
- (header.v[1]->edgeflag << 1) |
- (header.v[2]->edgeflag << 2));
-
- if (0) {
- const struct draw_vertex_shader *vs = stage->draw->vertex_shader;
- uint j, k;
- debug_printf("Clipped tri:\n");
- for (j = 0; j < 3; j++) {
- for (k = 0; k < vs->info.num_outputs; k++) {
- debug_printf(" Vert %d: Attr %d: %f %f %f %f\n", j, k,
- header.v[j]->data[k][0],
- header.v[j]->data[k][1],
- header.v[j]->data[k][2],
- header.v[j]->data[k][3]);
- }
+ if (i == n-1)
+ header.flags |= edge_last;
+
+ if (0) {
+ const struct draw_vertex_shader *vs = stage->draw->vs.vertex_shader;
+ uint j, k;
+ debug_printf("Clipped tri: (flat-shade-first = %d)\n",
+ stage->draw->rasterizer->flatshade_first);
+ for (j = 0; j < 3; j++) {
+ for (k = 0; k < vs->info.num_outputs; k++) {
+ debug_printf(" Vert %d: Attr %d: %f %f %f %f\n", j, k,
+ header.v[j]->data[k][0],
+ header.v[j]->data[k][1],
+ header.v[j]->data[k][2],
+ header.v[j]->data[k][3]);
}
}
-
- stage->next->tri( stage->next, &header );
-
- header.v[1]->edgeflag = tmp1;
- header.v[2]->edgeflag = tmp2;
}
+
+ stage->next->tri( stage->next, &header );
}
}
+
static INLINE float
dot4(const float *a, const float *b)
{
- return (a[0]*b[0] +
- a[1]*b[1] +
- a[2]*b[2] +
- a[3]*b[3]);
+ return (a[0] * b[0] +
+ a[1] * b[1] +
+ a[2] * b[2] +
+ a[3] * b[3]);
}
struct prim_header *header,
unsigned clipmask )
{
- struct clipper *clipper = clipper_stage( stage );
+ struct clip_stage *clipper = clip_stage( stage );
struct vertex_header *a[MAX_CLIPPED_VERTICES];
struct vertex_header *b[MAX_CLIPPED_VERTICES];
struct vertex_header **inlist = a;
clipmask &= ~(1<<plane_idx);
+ assert(n < MAX_CLIPPED_VERTICES);
+ if (n >= MAX_CLIPPED_VERTICES)
+ return;
inlist[n] = inlist[0]; /* prevent rotation of vertices */
for (i = 1; i <= n; i++) {
float dp = dot4( vert->clip, plane );
if (!IS_NEGATIVE(dp_prev)) {
+ assert(outcount < MAX_CLIPPED_VERTICES);
+ if (outcount >= MAX_CLIPPED_VERTICES)
+ return;
outlist[outcount++] = vert_prev;
}
if (DIFFERENT_SIGNS(dp, dp_prev)) {
- struct vertex_header *new_vert = clipper->stage.tmp[tmpnr++];
+ struct vertex_header *new_vert;
+
+ assert(tmpnr < MAX_CLIPPED_VERTICES + 1);
+ if (tmpnr >= MAX_CLIPPED_VERTICES + 1)
+ return;
+ new_vert = clipper->stage.tmp[tmpnr++];
+
+ assert(outcount < MAX_CLIPPED_VERTICES);
+ if (outcount >= MAX_CLIPPED_VERTICES)
+ return;
outlist[outcount++] = new_vert;
if (IS_NEGATIVE(dp)) {
dp_prev = dp;
}
+ /* swap in/out lists */
{
struct vertex_header **tmp = inlist;
inlist = outlist;
}
}
- /* If flat-shading, copy color to new provoking vertex.
+ /* If flat-shading, copy provoking vertex color to polygon vertex[0]
*/
- if (clipper->flat && inlist[0] != header->v[2]) {
- if (1) {
- inlist[0] = dup_vert(stage, inlist[0], tmpnr++);
+ if (n >= 3) {
+ if (clipper->flat) {
+ if (stage->draw->rasterizer->flatshade_first) {
+ if (inlist[0] != header->v[0]) {
+ assert(tmpnr < MAX_CLIPPED_VERTICES + 1);
+ if (tmpnr >= MAX_CLIPPED_VERTICES + 1)
+ return;
+ inlist[0] = dup_vert(stage, inlist[0], tmpnr++);
+ copy_colors(stage, inlist[0], header->v[0]);
+ }
+ }
+ else {
+ if (inlist[0] != header->v[2]) {
+ assert(tmpnr < MAX_CLIPPED_VERTICES + 1);
+ if (tmpnr >= MAX_CLIPPED_VERTICES + 1)
+ return;
+ inlist[0] = dup_vert(stage, inlist[0], tmpnr++);
+ copy_colors(stage, inlist[0], header->v[2]);
+ }
+ }
}
-
- copy_colors(stage, inlist[0], header->v[2]);
- }
-
-
-
- /* Emit the polygon as triangles to the setup stage:
- */
- if (n >= 3)
+
+ /* Emit the polygon as triangles to the setup stage:
+ */
emit_poly( stage, inlist, n, header );
+ }
}
struct prim_header *header,
unsigned clipmask )
{
- const struct clipper *clipper = clipper_stage( stage );
+ const struct clip_stage *clipper = clip_stage( stage );
struct vertex_header *v0 = header->v[0];
struct vertex_header *v1 = header->v[1];
const float *pos0 = v0->clip;
}
}
+
/* Update state. Could further delay this until we hit the first
* primitive that really requires clipping.
*/
static void
clip_init_state( struct draw_stage *stage )
{
- struct clipper *clipper = clipper_stage( stage );
+ struct clip_stage *clipper = clip_stage( stage );
clipper->flat = stage->draw->rasterizer->flatshade ? TRUE : FALSE;
if (clipper->flat) {
- const struct draw_vertex_shader *vs = stage->draw->vertex_shader;
+ const struct draw_vertex_shader *vs = stage->draw->vs.vertex_shader;
uint i;
clipper->num_color_attribs = 0;
*/
struct draw_stage *draw_clip_stage( struct draw_context *draw )
{
- struct clipper *clipper = CALLOC_STRUCT(clipper);
+ struct clip_stage *clipper = CALLOC_STRUCT(clip_stage);
if (clipper == NULL)
goto fail;
- if (!draw_alloc_temp_verts( &clipper->stage, MAX_CLIPPED_VERTICES+1 ))
- goto fail;
-
clipper->stage.draw = draw;
+ clipper->stage.name = "clipper";
clipper->stage.point = clip_point;
clipper->stage.line = clip_first_line;
clipper->stage.tri = clip_first_tri;
clipper->plane = draw->plane;
+ if (!draw_alloc_temp_verts( &clipper->stage, MAX_CLIPPED_VERTICES+1 ))
+ goto fail;
+
return &clipper->stage;
fail: