/**************************************************************************
*
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * Copyright 2007 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* 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 NON-INFRINGEMENT.
- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.
/**
* \brief Clipping stage
*
- * \author Keith Whitwell <keith@tungstengraphics.com>
+ * \author Keith Whitwell <keithw@vmware.com>
*/
+#include "util/u_bitcast.h"
#include "util/u_memory.h"
#include "util/u_math.h"
#include "draw_vs.h"
#include "draw_pipe.h"
+#include "draw_fs.h"
+#include "draw_gs.h"
-#ifndef IS_NEGATIVE
-#define IS_NEGATIVE(X) ((X) < 0.0)
-#endif
+/** Set to 1 to enable printing of coords before/after clipping */
+#define DEBUG_CLIP 0
+
#ifndef DIFFERENT_SIGNS
#define DIFFERENT_SIGNS(x, y) ((x) * (y) <= 0.0F && (x) - (y) != 0.0F)
#endif
-#ifndef MAX_CLIPPED_VERTICES
#define MAX_CLIPPED_VERTICES ((2 * (6 + PIPE_MAX_CLIP_PLANES))+1)
-#endif
-struct clipper {
+struct clip_stage {
struct draw_stage stage; /**< base class */
- /* Basically duplicate some of the flatshading logic here:
- */
- boolean flat;
- uint num_color_attribs;
- uint color_attribs[4]; /* front/back primary/secondary colors */
+ unsigned pos_attr;
+ boolean have_clipdist;
+ int cv_attr;
+
+ /* List of the attributes to be constant interpolated. */
+ uint num_const_attribs;
+ uint8_t const_attribs[PIPE_MAX_SHADER_OUTPUTS];
+ /* List of the attributes to be linear interpolated. */
+ uint num_linear_attribs;
+ uint8_t linear_attribs[PIPE_MAX_SHADER_OUTPUTS];
+ /* List of the attributes to be perspective interpolated. */
+ uint num_perspect_attribs;
+ uint8_t perspect_attribs[PIPE_MAX_SHADER_OUTPUTS];
float (*plane)[4];
};
-/* 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 clip_stage *)stage;
+}
+
+static inline unsigned
+draw_viewport_index(struct draw_context *draw,
+ const struct vertex_header *leading_vertex)
{
- return (struct clipper *)stage;
+ if (draw_current_shader_uses_viewport_index(draw)) {
+ unsigned viewport_index_output =
+ draw_current_shader_viewport_index_output(draw);
+ unsigned viewport_index =
+ u_bitcast_f2u(leading_vertex->data[viewport_index_output][0]);
+ return draw_clamp_viewport_idx(viewport_index);
+ } else {
+ return 0;
+ }
}
/* All attributes are float[4], so this is easy:
*/
-static void interp_attr( float *fdst,
- float t,
- const float *fin,
- const float *fout )
-{
- 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] );
+static void interp_attr(float dst[4],
+ float t,
+ const float in[4],
+ const float out[4])
+{
+ 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] );
}
-static void copy_colors( struct draw_stage *stage,
- struct vertex_header *dst,
- const struct vertex_header *src )
+/**
+ * Copy flat shaded attributes src vertex to dst vertex.
+ */
+static void copy_flat(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];
+ for (i = 0; i < clipper->num_const_attribs; i++) {
+ const uint attr = clipper->const_attribs[i];
COPY_4FV(dst->data[attr], src->data[attr]);
}
}
-
-
/* Interpolate between two vertices to produce a third.
*/
-static void interp( const struct clipper *clip,
- struct vertex_header *dst,
- float t,
- const struct vertex_header *out,
- const struct vertex_header *in )
+static void interp(const struct clip_stage *clip,
+ struct vertex_header *dst,
+ float t,
+ const struct vertex_header *out,
+ const struct vertex_header *in,
+ unsigned viewport_index)
{
- 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 pos_attr = clip->pos_attr;
unsigned j;
+ float t_nopersp;
/* Vertex header.
*/
- {
- dst->clipmask = 0;
- dst->edgeflag = 0; /* will get overwritten later */
- 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);
+ if (clip->cv_attr >= 0) {
+ interp_attr(dst->data[clip->cv_attr], t,
+ in->data[clip->cv_attr], out->data[clip->cv_attr]);
}
+ /* interpolate the clip-space position */
+ interp_attr(dst->clip_pos, t, in->clip_pos, out->clip_pos);
- /* 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 *scale = clip->stage.draw->viewport.scale;
- const float *trans = clip->stage.draw->viewport.translate;
+ const float *pos = dst->clip_pos;
+ const float *scale =
+ clip->stage.draw->viewports[viewport_index].scale;
+ const float *trans =
+ clip->stage.draw->viewports[viewport_index].translate;
const float oow = 1.0f / pos[3];
dst->data[pos_attr][0] = pos[0] * oow * scale[0] + trans[0];
dst->data[pos_attr][2] = pos[2] * oow * scale[2] + trans[2];
dst->data[pos_attr][3] = oow;
}
+
+
+ /* interp perspective attribs */
+ for (j = 0; j < clip->num_perspect_attribs; j++) {
+ const unsigned attr = clip->perspect_attribs[j];
+ interp_attr(dst->data[attr], t, in->data[attr], out->data[attr]);
+ }
- /* Other attributes
+ /**
+ * Compute the t in screen-space instead of 3d space to use
+ * for noperspective interpolation.
+ *
+ * The points can be aligned with the X axis, so in that case try
+ * the Y. When both points are at the same screen position, we can
+ * pick whatever value (the interpolated point won't be in front
+ * anyway), so just use the 3d t.
*/
- for (j = 0; j < nr_attrs; j++) {
- if (j != pos_attr)
- interp_attr(dst->data[j], t, in->data[j], out->data[j]);
+ if (clip->num_linear_attribs) {
+ int k;
+ t_nopersp = t;
+ /* find either in.x != out.x or in.y != out.y */
+ for (k = 0; k < 2; k++) {
+ if (in->clip_pos[k] != out->clip_pos[k]) {
+ /* do divide by W, then compute linear interpolation factor */
+ float in_coord = in->clip_pos[k] / in->clip_pos[3];
+ float out_coord = out->clip_pos[k] / out->clip_pos[3];
+ float dst_coord = dst->clip_pos[k] / dst->clip_pos[3];
+ t_nopersp = (dst_coord - out_coord) / (in_coord - out_coord);
+ break;
+ }
+ }
+ for (j = 0; j < clip->num_linear_attribs; j++) {
+ const unsigned attr = clip->linear_attribs[j];
+ interp_attr(dst->data[attr], t_nopersp, in->data[attr], out->data[attr]);
+ }
}
}
+/**
+ * Checks whether the specified triangle is empty and if it is returns
+ * true, otherwise returns false.
+ * Triangle is considered null/empty if its area is equal to zero.
+ */
+static inline boolean
+is_tri_null(const struct clip_stage *clip, const struct prim_header *header)
+{
+ const unsigned pos_attr = clip->pos_attr;
+ float x1 = header->v[1]->data[pos_attr][0] - header->v[0]->data[pos_attr][0];
+ float y1 = header->v[1]->data[pos_attr][1] - header->v[0]->data[pos_attr][1];
+ float z1 = header->v[1]->data[pos_attr][2] - header->v[0]->data[pos_attr][2];
-static void emit_poly( struct draw_stage *stage,
- struct vertex_header **inlist,
- unsigned n,
- const struct prim_header *origPrim)
+ float x2 = header->v[2]->data[pos_attr][0] - header->v[0]->data[pos_attr][0];
+ float y2 = header->v[2]->data[pos_attr][1] - header->v[0]->data[pos_attr][1];
+ float z2 = header->v[2]->data[pos_attr][2] - header->v[0]->data[pos_attr][2];
+
+ float vx = y1 * z2 - z1 * y2;
+ float vy = x1 * z2 - z1 * x2;
+ float vz = x1 * y2 - y1 * x2;
+
+ return (vx*vx + vy*vy + vz*vz) == 0.f;
+}
+
+/**
+ * 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,
+ const boolean *edgeflags,
+ unsigned n,
+ const struct prim_header *origPrim)
{
+ const struct clip_stage *clipper = clip_stage(stage);
struct prim_header header;
unsigned i;
+ ushort edge_first, edge_middle, edge_last;
+ boolean last_tri_was_null = FALSE;
+ boolean tri_was_not_null = FALSE;
+
+ 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;
+ }
- const ushort edge_first = DRAW_PIPE_EDGE_FLAG_2;
- const ushort edge_middle = DRAW_PIPE_EDGE_FLAG_0;
- const ushort edge_last = DRAW_PIPE_EDGE_FLAG_1;
+ if (!edgeflags[0])
+ edge_first = 0;
/* later stages may need the determinant, but only the sign matters */
header.det = origPrim->det;
header.pad = 0;
for (i = 2; i < n; i++, header.flags = edge_middle) {
- header.v[0] = inlist[i-1];
- header.v[1] = inlist[i];
- header.v[2] = inlist[0]; /* keep in v[2] for flatshading */
+ boolean tri_null;
+ /* 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 */
+ }
- if (i == n-1)
+ tri_null = is_tri_null(clipper, &header);
+ /* If we generated a triangle with an area, aka. non-null triangle,
+ * or if the previous triangle was also null then skip all subsequent
+ * null triangles */
+ if ((tri_was_not_null && tri_null) || (last_tri_was_null && tri_null)) {
+ last_tri_was_null = tri_null;
+ continue;
+ }
+ last_tri_was_null = tri_null;
+ if (!tri_null) {
+ tri_was_not_null = TRUE;
+ }
+
+ if (!edgeflags[i-1]) {
+ header.flags &= ~edge_middle;
+ }
+
+ if (i == n - 1 && edgeflags[i])
header.flags |= edge_last;
- if (0) {
- const struct draw_vertex_shader *vs = stage->draw->vs.vertex_shader;
+ if (DEBUG_CLIP) {
uint j, k;
- debug_printf("Clipped tri:\n");
+ 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: clip pos: %f %f %f %f\n", j,
+ header.v[j]->clip_pos[0],
+ header.v[j]->clip_pos[1],
+ header.v[j]->clip_pos[2],
+ header.v[j]->clip_pos[3]);
+ if (clipper->cv_attr >= 0) {
+ debug_printf(" Vert %d: cv: %f %f %f %f\n", j,
+ header.v[j]->data[clipper->cv_attr][0],
+ header.v[j]->data[clipper->cv_attr][1],
+ header.v[j]->data[clipper->cv_attr][2],
+ header.v[j]->data[clipper->cv_attr][3]);
+ }
+ for (k = 0; k < draw_num_shader_outputs(stage->draw); 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],
}
}
}
-
- stage->next->tri( stage->next, &header );
+ stage->next->tri(stage->next, &header);
}
}
-static INLINE float
+static inline float
dot4(const float *a, const float *b)
{
return (a[0] * b[0] +
a[3] * b[3]);
}
+/*
+ * this function extracts the clip distance for the current plane,
+ * it first checks if the shader provided a clip distance, otherwise
+ * it works out the value using the clipvertex
+ */
+static inline float getclipdist(const struct clip_stage *clipper,
+ struct vertex_header *vert,
+ int plane_idx)
+{
+ const float *plane;
+ float dp;
+ if (plane_idx < 6) {
+ /* ordinary xyz view volume clipping uses pos output */
+ plane = clipper->plane[plane_idx];
+ dp = dot4(vert->clip_pos, plane);
+ }
+ else if (clipper->have_clipdist) {
+ /* pick the correct clipdistance element from the output vectors */
+ int _idx = plane_idx - 6;
+ int cdi = _idx >= 4;
+ int vidx = cdi ? _idx - 4 : _idx;
+ dp = vert->data[draw_current_shader_ccdistance_output(clipper->stage.draw, cdi)][vidx];
+ } else {
+ /*
+ * legacy user clip planes or gl_ClipVertex
+ */
+ plane = clipper->plane[plane_idx];
+ if (clipper->cv_attr >= 0) {
+ dp = dot4(vert->data[clipper->cv_attr], plane);
+ }
+ else {
+ dp = dot4(vert->clip_pos, plane);
+ }
+ }
+ return dp;
+}
/* Clip a triangle against the viewport and user clip planes.
*/
static void
-do_clip_tri( struct draw_stage *stage,
- struct prim_header *header,
- unsigned clipmask )
+do_clip_tri(struct draw_stage *stage,
+ 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;
struct vertex_header **outlist = b;
+ struct vertex_header *prov_vertex;
unsigned tmpnr = 0;
unsigned n = 3;
unsigned i;
+ boolean aEdges[MAX_CLIPPED_VERTICES];
+ boolean bEdges[MAX_CLIPPED_VERTICES];
+ boolean *inEdges = aEdges;
+ boolean *outEdges = bEdges;
+ int viewport_index = 0;
inlist[0] = header->v[0];
inlist[1] = header->v[1];
inlist[2] = header->v[2];
+ /*
+ * For d3d10, we need to take this from the leading (first) vertex.
+ * For GL, we could do anything (as long as we advertize
+ * GL_UNDEFINED_VERTEX for the VIEWPORT_INDEX_PROVOKING_VERTEX query),
+ * but it needs to be consistent with what other parts (i.e. driver)
+ * will do, and that seems easier with GL_PROVOKING_VERTEX logic.
+ */
+ if (stage->draw->rasterizer->flatshade_first) {
+ prov_vertex = inlist[0];
+ }
+ else {
+ prov_vertex = inlist[2];
+ }
+ viewport_index = draw_viewport_index(clipper->stage.draw, prov_vertex);
+
+ if (DEBUG_CLIP) {
+ const float *v0 = header->v[0]->clip_pos;
+ const float *v1 = header->v[1]->clip_pos;
+ const float *v2 = header->v[2]->clip_pos;
+ debug_printf("Clip triangle pos:\n");
+ debug_printf(" %f, %f, %f, %f\n", v0[0], v0[1], v0[2], v0[3]);
+ debug_printf(" %f, %f, %f, %f\n", v1[0], v1[1], v1[2], v1[3]);
+ debug_printf(" %f, %f, %f, %f\n", v2[0], v2[1], v2[2], v2[3]);
+ if (clipper->cv_attr >= 0) {
+ const float *v0 = header->v[0]->data[clipper->cv_attr];
+ const float *v1 = header->v[1]->data[clipper->cv_attr];
+ const float *v2 = header->v[2]->data[clipper->cv_attr];
+ debug_printf("Clip triangle cv:\n");
+ debug_printf(" %f, %f, %f, %f\n", v0[0], v0[1], v0[2], v0[3]);
+ debug_printf(" %f, %f, %f, %f\n", v1[0], v1[1], v1[2], v1[3]);
+ debug_printf(" %f, %f, %f, %f\n", v2[0], v2[1], v2[2], v2[3]);
+ }
+ }
+
+ /*
+ * Note: at this point we can't just use the per-vertex edge flags.
+ * We have to observe the edge flag bits set in header->flags which
+ * were set during primitive decomposition. Put those flags into
+ * an edge flags array which parallels the vertex array.
+ * Later, in the 'unfilled' pipeline stage we'll draw the edge if both
+ * the header.flags bit is set AND the per-vertex edgeflag field is set.
+ */
+ inEdges[0] = !!(header->flags & DRAW_PIPE_EDGE_FLAG_0);
+ inEdges[1] = !!(header->flags & DRAW_PIPE_EDGE_FLAG_1);
+ inEdges[2] = !!(header->flags & DRAW_PIPE_EDGE_FLAG_2);
+
while (clipmask && n >= 3) {
const unsigned plane_idx = ffs(clipmask)-1;
- const float *plane = clipper->plane[plane_idx];
+ const boolean is_user_clip_plane = plane_idx >= 6;
struct vertex_header *vert_prev = inlist[0];
- float dp_prev = dot4( vert_prev->clip, plane );
+ boolean *edge_prev = &inEdges[0];
+ float dp_prev;
unsigned outcount = 0;
+ dp_prev = getclipdist(clipper, vert_prev, plane_idx);
clipmask &= ~(1<<plane_idx);
+ if (util_is_inf_or_nan(dp_prev))
+ return; //discard nan
+
+ assert(n < MAX_CLIPPED_VERTICES);
+ if (n >= MAX_CLIPPED_VERTICES)
+ return;
inlist[n] = inlist[0]; /* prevent rotation of vertices */
+ inEdges[n] = inEdges[0];
for (i = 1; i <= n; i++) {
- struct vertex_header *vert = inlist[i];
-
- float dp = dot4( vert->clip, plane );
-
- if (!IS_NEGATIVE(dp_prev)) {
- outlist[outcount++] = vert_prev;
- }
-
- if (DIFFERENT_SIGNS(dp, dp_prev)) {
- struct vertex_header *new_vert = clipper->stage.tmp[tmpnr++];
- outlist[outcount++] = new_vert;
-
- if (IS_NEGATIVE(dp)) {
- /* Going out of bounds. Avoid division by zero as we
- * know dp != dp_prev from DIFFERENT_SIGNS, above.
- */
- float t = dp / (dp - dp_prev);
- interp( clipper, new_vert, t, vert, vert_prev );
-
- /* Force edgeflag true in this case:
- */
- new_vert->edgeflag = 1;
- } else {
- /* Coming back in.
- */
- float t = dp_prev / (dp_prev - dp);
- interp( clipper, new_vert, t, vert_prev, vert );
-
- /* Copy starting vert's edgeflag:
- */
- new_vert->edgeflag = vert_prev->edgeflag;
- }
- }
-
- vert_prev = vert;
- dp_prev = dp;
+ struct vertex_header *vert = inlist[i];
+ boolean *edge = &inEdges[i];
+
+ float dp = getclipdist(clipper, vert, plane_idx);
+
+ if (util_is_inf_or_nan(dp))
+ return; //discard nan
+
+ if (dp_prev >= 0.0f) {
+ assert(outcount < MAX_CLIPPED_VERTICES);
+ if (outcount >= MAX_CLIPPED_VERTICES)
+ return;
+ outEdges[outcount] = *edge_prev;
+ outlist[outcount++] = vert_prev;
+ }
+
+ if (DIFFERENT_SIGNS(dp, dp_prev)) {
+ struct vertex_header *new_vert;
+ boolean *new_edge;
+
+ 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;
+
+ new_edge = &outEdges[outcount];
+ outlist[outcount++] = new_vert;
+
+ if (dp < 0.0f) {
+ /* Going out of bounds. Avoid division by zero as we
+ * know dp != dp_prev from DIFFERENT_SIGNS, above.
+ */
+ float t = dp / (dp - dp_prev);
+ interp( clipper, new_vert, t, vert, vert_prev, viewport_index );
+
+ /* Whether or not to set edge flag for the new vert depends
+ * on whether it's a user-defined clipping plane. We're
+ * copying NVIDIA's behaviour here.
+ */
+ if (is_user_clip_plane) {
+ /* we want to see an edge along the clip plane */
+ *new_edge = TRUE;
+ new_vert->edgeflag = TRUE;
+ }
+ else {
+ /* we don't want to see an edge along the frustum clip plane */
+ *new_edge = *edge_prev;
+ new_vert->edgeflag = FALSE;
+ }
+ }
+ else {
+ /* Coming back in.
+ */
+ float t = dp_prev / (dp_prev - dp);
+ interp( clipper, new_vert, t, vert_prev, vert, viewport_index );
+
+ /* Copy starting vert's edgeflag:
+ */
+ new_vert->edgeflag = vert_prev->edgeflag;
+ *new_edge = *edge_prev;
+ }
+ }
+
+ vert_prev = vert;
+ edge_prev = edge;
+ dp_prev = dp;
}
/* swap in/out lists */
{
- struct vertex_header **tmp = inlist;
- inlist = outlist;
- outlist = tmp;
- n = outcount;
+ struct vertex_header **tmp = inlist;
+ inlist = outlist;
+ outlist = tmp;
+ n = outcount;
}
+ {
+ boolean *tmp = inEdges;
+ inEdges = outEdges;
+ outEdges = tmp;
+ }
+
}
- /* If flat-shading, copy color to new provoking vertex.
+ /* If constant interpolated, copy provoking vertex attrib to polygon vertex[0]
*/
- if (clipper->flat && inlist[0] != header->v[2]) {
- inlist[0] = dup_vert(stage, inlist[0], tmpnr++);
+ if (n >= 3) {
+ if (clipper->num_const_attribs) {
+ 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_flat(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_flat(stage, inlist[0], header->v[2]);
+ }
+ }
+ }
- copy_colors(stage, inlist[0], header->v[2]);
+ /* Emit the polygon as triangles to the setup stage:
+ */
+ emit_poly(stage, inlist, inEdges, n, header);
}
-
- /* Emit the polygon as triangles to the setup stage:
- */
- if (n >= 3)
- emit_poly( stage, inlist, n, header );
}
/* Clip a line against the viewport and user clip planes.
*/
static void
-do_clip_line( struct draw_stage *stage,
- struct prim_header *header,
- unsigned clipmask )
+do_clip_line(struct draw_stage *stage,
+ 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;
- const float *pos1 = v1->clip;
+ struct vertex_header *prov_vertex;
float t0 = 0.0F;
float t1 = 0.0F;
struct prim_header newprim;
+ int viewport_index;
+
+ newprim.flags = header->flags;
+
+ if (stage->draw->rasterizer->flatshade_first) {
+ prov_vertex = v0;
+ }
+ else {
+ prov_vertex = v1;
+ }
+ viewport_index = draw_viewport_index(clipper->stage.draw, prov_vertex);
while (clipmask) {
const unsigned plane_idx = ffs(clipmask)-1;
- const float *plane = clipper->plane[plane_idx];
- const float dp0 = dot4( pos0, plane );
- const float dp1 = dot4( pos1, plane );
+ const float dp0 = getclipdist(clipper, v0, plane_idx);
+ const float dp1 = getclipdist(clipper, v1, plane_idx);
+
+ if (util_is_inf_or_nan(dp0) || util_is_inf_or_nan(dp1))
+ return; //discard nan
if (dp1 < 0.0F) {
- float t = dp1 / (dp1 - dp0);
+ float t = dp1 / (dp1 - dp0);
t1 = MAX2(t1, t);
}
if (dp0 < 0.0F) {
- float t = dp0 / (dp0 - dp1);
+ float t = dp0 / (dp0 - dp1);
t0 = MAX2(t0, t);
}
if (t0 + t1 >= 1.0F)
- return; /* discard */
+ return; /* discard */
clipmask &= ~(1 << plane_idx); /* turn off this plane's bit */
}
if (v0->clipmask) {
- interp( clipper, stage->tmp[0], t0, v0, v1 );
-
- if (clipper->flat)
- copy_colors(stage, stage->tmp[0], v0);
-
+ interp( clipper, stage->tmp[0], t0, v0, v1, viewport_index );
+ if (stage->draw->rasterizer->flatshade_first) {
+ copy_flat(stage, stage->tmp[0], v0); /* copy v0 color to tmp[0] */
+ }
+ else {
+ copy_flat(stage, stage->tmp[0], v1); /* copy v1 color to tmp[0] */
+ }
newprim.v[0] = stage->tmp[0];
}
else {
}
if (v1->clipmask) {
- interp( clipper, stage->tmp[1], t1, v1, v0 );
+ interp( clipper, stage->tmp[1], t1, v1, v0, viewport_index );
+ if (stage->draw->rasterizer->flatshade_first) {
+ copy_flat(stage, stage->tmp[1], v0); /* copy v0 color to tmp[1] */
+ }
+ else {
+ copy_flat(stage, stage->tmp[1], v1); /* copy v1 color to tmp[1] */
+ }
newprim.v[1] = stage->tmp[1];
}
else {
static void
-clip_point( struct draw_stage *stage,
- struct prim_header *header )
+clip_point(struct draw_stage *stage, struct prim_header *header)
{
- if (header->v[0]->clipmask == 0)
+ if (header->v[0]->clipmask == 0)
stage->next->point( stage->next, header );
}
+/*
+ * Clip points but ignore the first 4 (xy) clip planes.
+ * (Because the generated clip mask is completely unaffacted by guard band,
+ * we still need to manually evaluate the x/y planes if they are outside
+ * the guard band and not just outside the vp.)
+ */
+static void
+clip_point_guard_xy(struct draw_stage *stage, struct prim_header *header)
+{
+ unsigned clipmask = header->v[0]->clipmask;
+ if ((clipmask & 0xffffffff) == 0)
+ stage->next->point(stage->next, header);
+ else if ((clipmask & 0xfffffff0) == 0) {
+ while (clipmask) {
+ const unsigned plane_idx = ffs(clipmask)-1;
+ clipmask &= ~(1 << plane_idx); /* turn off this plane's bit */
+ /* TODO: this should really do proper guardband clipping,
+ * currently just throw out infs/nans.
+ * Also note that vertices with negative w values MUST be tossed
+ * out (not sure if proper guardband clipping would do this
+ * automatically). These would usually be captured by depth clip
+ * too but this can be disabled.
+ */
+ if (header->v[0]->clip_pos[3] <= 0.0f ||
+ util_is_inf_or_nan(header->v[0]->clip_pos[0]) ||
+ util_is_inf_or_nan(header->v[0]->clip_pos[1]))
+ return;
+ }
+ stage->next->point(stage->next, header);
+ }
+}
+
+
+static void
+clip_first_point(struct draw_stage *stage, struct prim_header *header)
+{
+ stage->point = stage->draw->guard_band_points_xy ? clip_point_guard_xy : clip_point;
+ stage->point(stage, header);
+}
+
+
static void
-clip_line( struct draw_stage *stage,
- struct prim_header *header )
+clip_line(struct draw_stage *stage, struct prim_header *header)
{
unsigned clipmask = (header->v[0]->clipmask |
header->v[1]->clipmask);
-
+
if (clipmask == 0) {
/* no clipping needed */
stage->next->line( stage->next, header );
static void
-clip_tri( struct draw_stage *stage,
- struct prim_header *header )
+clip_tri(struct draw_stage *stage, struct prim_header *header)
{
unsigned clipmask = (header->v[0]->clipmask |
header->v[1]->clipmask |
header->v[2]->clipmask);
-
+
if (clipmask == 0) {
/* no clipping needed */
stage->next->tri( stage->next, header );
}
+static int
+find_interp(const struct draw_fragment_shader *fs, int *indexed_interp,
+ uint semantic_name, uint semantic_index)
+{
+ int interp;
+ /* If it's gl_{Front,Back}{,Secondary}Color, pick up the mode
+ * from the array we've filled before. */
+ if (semantic_name == TGSI_SEMANTIC_COLOR ||
+ semantic_name == TGSI_SEMANTIC_BCOLOR) {
+ interp = indexed_interp[semantic_index];
+ } else if (semantic_name == TGSI_SEMANTIC_POSITION ||
+ semantic_name == TGSI_SEMANTIC_CLIPVERTEX) {
+ /* these inputs are handled specially always */
+ return -1;
+ } else {
+ /* Otherwise, search in the FS inputs, with a decent default
+ * if we don't find it.
+ * This probably only matters for layer, vpindex, culldist, maybe
+ * front_face.
+ */
+ uint j;
+ if (semantic_name == TGSI_SEMANTIC_LAYER ||
+ semantic_name == TGSI_SEMANTIC_VIEWPORT_INDEX) {
+ interp = TGSI_INTERPOLATE_CONSTANT;
+ }
+ else {
+ interp = TGSI_INTERPOLATE_PERSPECTIVE;
+ }
+ if (fs) {
+ for (j = 0; j < fs->info.num_inputs; j++) {
+ if (semantic_name == fs->info.input_semantic_name[j] &&
+ semantic_index == fs->info.input_semantic_index[j]) {
+ interp = fs->info.input_interpolate[j];
+ break;
+ }
+ }
+ }
+ }
+ return interp;
+}
+
/* 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 )
+clip_init_state(struct draw_stage *stage)
{
- struct clipper *clipper = clipper_stage( stage );
+ struct clip_stage *clipper = clip_stage(stage);
+ const struct draw_context *draw = stage->draw;
+ const struct draw_fragment_shader *fs = draw->fs.fragment_shader;
+ const struct tgsi_shader_info *info = draw_get_shader_info(draw);
+ uint i, j;
+ int indexed_interp[2];
+
+ clipper->pos_attr = draw_current_shader_position_output(draw);
+ clipper->have_clipdist = draw_current_shader_num_written_clipdistances(draw) > 0;
+ if (draw_current_shader_clipvertex_output(draw) != clipper->pos_attr) {
+ clipper->cv_attr = (int)draw_current_shader_clipvertex_output(draw);
+ }
+ else {
+ clipper->cv_attr = -1;
+ }
- clipper->flat = stage->draw->rasterizer->flatshade ? TRUE : FALSE;
+ /* We need to know for each attribute what kind of interpolation is
+ * done on it (flat, smooth or noperspective). But the information
+ * is not directly accessible for outputs, only for inputs. So we
+ * have to match semantic name and index between the VS (or GS/ES)
+ * outputs and the FS inputs to get to the interpolation mode.
+ *
+ * The only hitch is with gl_FrontColor/gl_BackColor which map to
+ * gl_Color, and their Secondary versions. First there are (up to)
+ * two outputs for one input, so we tuck the information in a
+ * specific array. Second if they don't have qualifiers, the
+ * default value has to be picked from the global shade mode.
+ *
+ * Of course, if we don't have a fragment shader in the first
+ * place, defaults should be used.
+ */
- if (clipper->flat) {
- const struct draw_vertex_shader *vs = stage->draw->vs.vertex_shader;
- uint i;
+ /* First pick up the interpolation mode for
+ * gl_Color/gl_SecondaryColor, with the correct default.
+ */
+ indexed_interp[0] = indexed_interp[1] = draw->rasterizer->flatshade ?
+ TGSI_INTERPOLATE_CONSTANT : TGSI_INTERPOLATE_PERSPECTIVE;
+
+ if (fs) {
+ for (i = 0; i < fs->info.num_inputs; i++) {
+ if (fs->info.input_semantic_name[i] == TGSI_SEMANTIC_COLOR) {
+ if (fs->info.input_interpolate[i] != TGSI_INTERPOLATE_COLOR)
+ indexed_interp[fs->info.input_semantic_index[i]] = fs->info.input_interpolate[i];
+ }
+ }
+ }
- clipper->num_color_attribs = 0;
- for (i = 0; i < vs->info.num_outputs; i++) {
- if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_COLOR ||
- vs->info.output_semantic_name[i] == TGSI_SEMANTIC_BCOLOR) {
- clipper->color_attribs[clipper->num_color_attribs++] = i;
- }
+ /* Then resolve the interpolation mode for every output attribute. */
+
+ clipper->num_const_attribs = 0;
+ clipper->num_linear_attribs = 0;
+ clipper->num_perspect_attribs = 0;
+ for (i = 0; i < info->num_outputs; i++) {
+ /* Find the interpolation mode for a specific attribute */
+ int interp = find_interp(fs, indexed_interp,
+ info->output_semantic_name[i],
+ info->output_semantic_index[i]);
+ switch (interp) {
+ case TGSI_INTERPOLATE_CONSTANT:
+ clipper->const_attribs[clipper->num_const_attribs] = i;
+ clipper->num_const_attribs++;
+ break;
+ case TGSI_INTERPOLATE_LINEAR:
+ clipper->linear_attribs[clipper->num_linear_attribs] = i;
+ clipper->num_linear_attribs++;
+ break;
+ case TGSI_INTERPOLATE_PERSPECTIVE:
+ clipper->perspect_attribs[clipper->num_perspect_attribs] = i;
+ clipper->num_perspect_attribs++;
+ break;
+ default:
+ assert(interp == -1);
+ break;
}
}
-
+ /* Search the extra vertex attributes */
+ for (j = 0; j < draw->extra_shader_outputs.num; j++) {
+ /* Find the interpolation mode for a specific attribute */
+ int interp = find_interp(fs, indexed_interp,
+ draw->extra_shader_outputs.semantic_name[j],
+ draw->extra_shader_outputs.semantic_index[j]);
+ switch (interp) {
+ case TGSI_INTERPOLATE_CONSTANT:
+ clipper->const_attribs[clipper->num_const_attribs] = i + j;
+ clipper->num_const_attribs++;
+ break;
+ case TGSI_INTERPOLATE_LINEAR:
+ clipper->linear_attribs[clipper->num_linear_attribs] = i + j;
+ clipper->num_linear_attribs++;
+ break;
+ case TGSI_INTERPOLATE_PERSPECTIVE:
+ clipper->perspect_attribs[clipper->num_perspect_attribs] = i + j;
+ clipper->num_perspect_attribs++;
+ break;
+ default:
+ assert(interp == -1);
+ break;
+ }
+ }
+
stage->tri = clip_tri;
stage->line = clip_line;
}
-static void clip_first_tri( struct draw_stage *stage,
- struct prim_header *header )
+static void clip_first_tri(struct draw_stage *stage,
+ struct prim_header *header)
{
clip_init_state( stage );
stage->tri( stage, header );
}
-static void clip_first_line( struct draw_stage *stage,
- struct prim_header *header )
+static void clip_first_line(struct draw_stage *stage,
+ struct prim_header *header)
{
clip_init_state( stage );
stage->line( stage, header );
}
-static void clip_flush( struct draw_stage *stage,
- unsigned flags )
+static void clip_flush(struct draw_stage *stage, unsigned flags)
{
stage->tri = clip_first_tri;
stage->line = clip_first_line;
}
-static void clip_reset_stipple_counter( struct draw_stage *stage )
+static void clip_reset_stipple_counter(struct draw_stage *stage)
{
stage->next->reset_stipple_counter( stage->next );
}
-static void clip_destroy( struct draw_stage *stage )
+static void clip_destroy(struct draw_stage *stage)
{
draw_free_temp_verts( stage );
FREE( stage );
* Allocate a new clipper stage.
* \return pointer to new stage object
*/
-struct draw_stage *draw_clip_stage( struct draw_context *draw )
+struct draw_stage *draw_clip_stage(struct draw_context *draw)
{
- struct clipper *clipper = CALLOC_STRUCT(clipper);
- if (clipper == NULL)
- goto fail;
-
- if (!draw_alloc_temp_verts( &clipper->stage, MAX_CLIPPED_VERTICES+1 ))
+ struct clip_stage *clipper = CALLOC_STRUCT(clip_stage);
+ if (!clipper)
goto fail;
clipper->stage.draw = draw;
clipper->stage.name = "clipper";
- clipper->stage.point = clip_point;
+ clipper->stage.point = clip_first_point;
clipper->stage.line = clip_first_line;
clipper->stage.tri = clip_first_tri;
clipper->stage.flush = clip_flush;
clipper->plane = draw->plane;
+ if (!draw_alloc_temp_verts( &clipper->stage, MAX_CLIPPED_VERTICES+1 ))
+ goto fail;
+
return &clipper->stage;
fail:
projects / mesa.git / blobdiff