X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fgallium%2Fauxiliary%2Futil%2Fu_prim.h;h=b4c06df01e0fae902ac181aca366848f9c881530;hb=979e7e3680792dc23d434295edd10b161af8aee3;hp=a9b533eea700458bf512607aa8b5fd9f29c4ce7f;hpb=9615daa9324341f6a56932dc46b807f402d18283;p=mesa.git

diff --git a/src/gallium/auxiliary/util/u_prim.h b/src/gallium/auxiliary/util/u_prim.h
index a9b533eea70..b4c06df01e0 100644
--- a/src/gallium/auxiliary/util/u_prim.h
+++ b/src/gallium/auxiliary/util/u_prim.h
@@ -1,6 +1,6 @@
 /**************************************************************************
  *
- * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * Copyright 2008 VMware, Inc.
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -18,7 +18,7 @@
  * 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.
@@ -26,113 +26,339 @@
  **************************************************************************/
 
 
-#ifndef U_BLIT_H
-#define U_BLIT_H
+#ifndef U_PRIM_H
+#define U_PRIM_H
 
 
+#include "pipe/p_defines.h"
+#include "util/u_debug.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include "pipe/p_defines.h"
+struct u_prim_vertex_count {
+   unsigned min;
+   unsigned incr;
+};
 
-static INLINE boolean u_validate_pipe_prim( unsigned pipe_prim, unsigned nr )
+/**
+ * Decompose a primitive that is a loop, a strip, or a fan.  Return the
+ * original primitive if it is already decomposed.
+ */
+static inline enum pipe_prim_type
+u_decomposed_prim(enum pipe_prim_type prim)
 {
-   boolean ok = TRUE;
+   switch (prim) {
+   case PIPE_PRIM_LINE_LOOP:
+   case PIPE_PRIM_LINE_STRIP:
+      return PIPE_PRIM_LINES;
+   case PIPE_PRIM_TRIANGLE_STRIP:
+   case PIPE_PRIM_TRIANGLE_FAN:
+      return PIPE_PRIM_TRIANGLES;
+   case PIPE_PRIM_QUAD_STRIP:
+      return PIPE_PRIM_QUADS;
+   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+      return PIPE_PRIM_LINES_ADJACENCY;
+   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+      return PIPE_PRIM_TRIANGLES_ADJACENCY;
+   default:
+      return prim;
+   }
+}
 
-   switch (pipe_prim) {
+/**
+ * Reduce a primitive to one of PIPE_PRIM_POINTS, PIPE_PRIM_LINES, and
+ * PIPE_PRIM_TRIANGLES.
+ */
+static inline enum pipe_prim_type
+u_reduced_prim(enum pipe_prim_type prim)
+{
+   switch (prim) {
    case PIPE_PRIM_POINTS:
-      ok = (nr >= 1);
-      break;
+      return PIPE_PRIM_POINTS;
    case PIPE_PRIM_LINES:
-      ok = (nr >= 2);
-      break;
+   case PIPE_PRIM_LINE_LOOP:
    case PIPE_PRIM_LINE_STRIP:
+   case PIPE_PRIM_LINES_ADJACENCY:
+   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+      return PIPE_PRIM_LINES;
+   default:
+      return PIPE_PRIM_TRIANGLES;
+   }
+}
+
+/**
+ * Re-assemble a primitive to remove its adjacency.
+ */
+static inline enum pipe_prim_type
+u_assembled_prim(enum pipe_prim_type prim)
+{
+   switch (prim) {
+   case PIPE_PRIM_LINES_ADJACENCY:
+   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+      return PIPE_PRIM_LINES;
+   case PIPE_PRIM_TRIANGLES_ADJACENCY:
+   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+      return PIPE_PRIM_TRIANGLES;
+   default:
+      return prim;
+   }
+}
+
+/**
+ * Return the vertex count information for a primitive.
+ *
+ * Note that if this function is called directly or indirectly anywhere in a
+ * source file, it will increase the size of the binary slightly more than
+ * expected because of the use of a table.
+ */
+static inline const struct u_prim_vertex_count *
+u_prim_vertex_count(enum pipe_prim_type prim)
+{
+   static const struct u_prim_vertex_count prim_table[PIPE_PRIM_MAX] = {
+      { 1, 1 }, /* PIPE_PRIM_POINTS */
+      { 2, 2 }, /* PIPE_PRIM_LINES */
+      { 2, 1 }, /* PIPE_PRIM_LINE_LOOP */
+      { 2, 1 }, /* PIPE_PRIM_LINE_STRIP */
+      { 3, 3 }, /* PIPE_PRIM_TRIANGLES */
+      { 3, 1 }, /* PIPE_PRIM_TRIANGLE_STRIP */
+      { 3, 1 }, /* PIPE_PRIM_TRIANGLE_FAN */
+      { 4, 4 }, /* PIPE_PRIM_QUADS */
+      { 4, 2 }, /* PIPE_PRIM_QUAD_STRIP */
+      { 3, 1 }, /* PIPE_PRIM_POLYGON */
+      { 4, 4 }, /* PIPE_PRIM_LINES_ADJACENCY */
+      { 4, 1 }, /* PIPE_PRIM_LINE_STRIP_ADJACENCY */
+      { 6, 6 }, /* PIPE_PRIM_TRIANGLES_ADJACENCY */
+      { 6, 2 }, /* PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY */
+   };
+
+   return (likely(prim < PIPE_PRIM_MAX)) ? &prim_table[prim] : NULL;
+}
+
+/**
+ * Given a vertex count, return the number of primitives.
+ * For polygons, return the number of triangles.
+ */
+static inline unsigned
+u_prims_for_vertices(enum pipe_prim_type prim, unsigned num)
+{
+   const struct u_prim_vertex_count *info = u_prim_vertex_count(prim);
+
+   assert(info);
+   assert(info->incr != 0);
+
+   if (num < info->min)
+      return 0;
+
+   return 1 + ((num - info->min) / info->incr);
+}
+
+static inline boolean
+u_validate_pipe_prim(enum pipe_prim_type pipe_prim, unsigned nr)
+{
+   const struct u_prim_vertex_count *count = u_prim_vertex_count(pipe_prim);
+
+   return (count && nr >= count->min);
+}
+
+
+static inline boolean
+u_trim_pipe_prim(enum pipe_prim_type pipe_prim, unsigned *nr)
+{
+   const struct u_prim_vertex_count *count = u_prim_vertex_count(pipe_prim);
+
+   if (count && *nr >= count->min) {
+      if (count->incr > 1)
+         *nr -= (*nr % count->incr);
+      return TRUE;
+   }
+   else {
+      *nr = 0;
+      return FALSE;
+   }
+}
+
+static inline unsigned
+u_vertices_per_prim(enum pipe_prim_type primitive)
+{
+   switch(primitive) {
+   case PIPE_PRIM_POINTS:
+      return 1;
+   case PIPE_PRIM_LINES:
    case PIPE_PRIM_LINE_LOOP:
-      ok = (nr >= 2);
-      break;
+   case PIPE_PRIM_LINE_STRIP:
+      return 2;
    case PIPE_PRIM_TRIANGLES:
-      ok = (nr >= 3);
-      break;
    case PIPE_PRIM_TRIANGLE_STRIP:
    case PIPE_PRIM_TRIANGLE_FAN:
+      return 3;
+   case PIPE_PRIM_LINES_ADJACENCY:
+   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+      return 4;
+   case PIPE_PRIM_TRIANGLES_ADJACENCY:
+   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+      return 6;
+
+   /* following primitives should never be used
+    * with geometry shaders abd their size is
+    * undefined */
    case PIPE_PRIM_POLYGON:
-      ok = (nr >= 3);
-      break;
    case PIPE_PRIM_QUADS:
-      ok = (nr >= 4);
-      break;
    case PIPE_PRIM_QUAD_STRIP:
-      ok = (nr >= 4);
-      break;
    default:
-      ok = 0;
-      break;
+      debug_printf("Unrecognized geometry shader primitive");
+      return 3;
    }
-
-   return ok;
 }
 
-
-static INLINE boolean u_trim_pipe_prim( unsigned pipe_prim, unsigned *nr )
+/**
+ * Returns the number of decomposed primitives for the given
+ * vertex count.
+ * Parts of the pipline are invoked once for each triangle in
+ * triangle strip, triangle fans and triangles and once
+ * for each line in line strip, line loop, lines. Also 
+ * statistics depend on knowing the exact number of decomposed
+ * primitives for a set of vertices.
+ */
+static inline unsigned
+u_decomposed_prims_for_vertices(enum pipe_prim_type primitive, int vertices)
 {
-   boolean ok = TRUE;
-
-   switch (pipe_prim) {
+   switch (primitive) {
    case PIPE_PRIM_POINTS:
-      ok = (*nr >= 1);
-      break;
+      return vertices;
    case PIPE_PRIM_LINES:
-      ok = (*nr >= 2);
-      *nr -= (*nr % 2);
-      break;
-   case PIPE_PRIM_LINE_STRIP:
+      return vertices / 2;
    case PIPE_PRIM_LINE_LOOP:
-      ok = (*nr >= 2);
-      break;
+      return (vertices >= 2) ? vertices : 0;
+   case PIPE_PRIM_LINE_STRIP:
+      return (vertices >= 2) ? vertices - 1 : 0;
    case PIPE_PRIM_TRIANGLES:
-      ok = (*nr >= 3);
-      *nr -= (*nr % 3);
-      break;
+      return vertices / 3;
    case PIPE_PRIM_TRIANGLE_STRIP:
+      return (vertices >= 3) ? vertices - 2 : 0;
    case PIPE_PRIM_TRIANGLE_FAN:
+      return (vertices >= 3) ? vertices - 2 : 0;
+   case PIPE_PRIM_LINES_ADJACENCY:
+      return vertices / 4;
+   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+      return (vertices >= 4) ? vertices - 3 : 0;
+   case PIPE_PRIM_TRIANGLES_ADJACENCY:
+      return vertices / 6;
+   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+      return (vertices >= 6) ? 1 + (vertices - 6) / 2 : 0;
+   case PIPE_PRIM_QUADS:
+      return vertices / 4;
+   case PIPE_PRIM_QUAD_STRIP:
+      return (vertices >= 4) ? (vertices - 2) / 2 : 0;
+   /* Polygons can't be decomposed
+    * because the number of their vertices isn't known so
+    * for them and whatever else we don't recognize just
+    * return 1 if the number of vertices is greater than
+    * or equal to 3 and zero otherwise */
    case PIPE_PRIM_POLYGON:
-      ok = (*nr >= 3);
-      break;
+   default:
+      debug_printf("Invalid decomposition primitive!\n");
+      return (vertices >= 3) ? 1 : 0;
+   }
+}
+
+/**
+ * Returns the number of reduced/tessellated primitives for the given vertex
+ * count.  Each quad is treated as two triangles.  Polygons are treated as
+ * triangle fans.
+ */
+static inline unsigned
+u_reduced_prims_for_vertices(enum pipe_prim_type primitive, int vertices)
+{
+   switch (primitive) {
    case PIPE_PRIM_QUADS:
-      ok = (*nr >= 4);
-      *nr -= (*nr % 4);
-      break;
    case PIPE_PRIM_QUAD_STRIP:
-      ok = (*nr >= 4);
-      *nr -= (*nr % 2);
-      break;
+      return u_decomposed_prims_for_vertices(primitive, vertices) * 2;
+   case PIPE_PRIM_POLYGON:
+      primitive = PIPE_PRIM_TRIANGLE_FAN;
+      /* fall through */
    default:
-      ok = 0;
-      break;
+      return u_decomposed_prims_for_vertices(primitive, vertices);
    }
+}
 
-   if (!ok)
-      *nr = 0;
+static inline enum pipe_prim_type
+u_base_prim_type(enum pipe_prim_type prim_type)
+{
+   switch(prim_type) {
+      case PIPE_PRIM_POINTS:
+         return PIPE_PRIM_POINTS;
+      case PIPE_PRIM_LINES:
+      case PIPE_PRIM_LINE_LOOP:
+      case PIPE_PRIM_LINE_STRIP:
+      case PIPE_PRIM_LINES_ADJACENCY:
+      case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+         return PIPE_PRIM_LINES;
+      case PIPE_PRIM_TRIANGLES:
+      case PIPE_PRIM_TRIANGLE_STRIP:
+      case PIPE_PRIM_TRIANGLE_FAN:
+      case PIPE_PRIM_TRIANGLES_ADJACENCY:
+      case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+         return PIPE_PRIM_TRIANGLES;
+      case PIPE_PRIM_QUADS:
+      case PIPE_PRIM_QUAD_STRIP:
+         return PIPE_PRIM_QUADS;
+      default:
+         return prim_type;
+   }
+}
+
+static inline unsigned
+u_vertices_for_prims(enum pipe_prim_type prim_type, int count)
+{
+   if (count <= 0)
+      return 0;
+
+   /* We can only figure out the number of vertices from a number of primitives
+    * if we are using basic primitives (so no loops, strips, fans, etc).
+    */
+   assert(prim_type == u_base_prim_type(prim_type) &&
+          prim_type != PIPE_PRIM_PATCHES && prim_type != PIPE_PRIM_POLYGON);
+
+   const struct u_prim_vertex_count *info = u_prim_vertex_count(prim_type);
+   assert(info);
 
-   return ok;
+   return info->min + (count - 1) * info->incr;
 }
 
+/**
+ * Returns the number of stream out outputs for a given number of vertices and
+ * primitive type.
+ */
 
-static INLINE unsigned u_reduced_prim( unsigned pipe_prim )
+static inline unsigned
+u_stream_outputs_for_vertices(enum pipe_prim_type primitive, unsigned nr)
 {
-   switch (pipe_prim) {
-   case PIPE_PRIM_POINTS:
-      return PIPE_PRIM_POINTS;
+   /* Extraneous vertices don't contribute to stream outputs */
+   u_trim_pipe_prim(primitive, &nr);
 
-   case PIPE_PRIM_LINES:
-   case PIPE_PRIM_LINE_STRIP:
-   case PIPE_PRIM_LINE_LOOP:
-      return PIPE_PRIM_LINES;
+   /* Polygons are special, since they are a single primitive with many
+    * vertices. In this case, we just have an output for each vertex (after
+    * trimming) */
 
-   default:
-      return PIPE_PRIM_TRIANGLES;
-   }
+   if (primitive == PIPE_PRIM_POLYGON)
+      return nr;
+
+   /* Normally, consider how many primitives are actually generated */
+   unsigned prims = u_decomposed_prims_for_vertices(primitive, nr);
+
+   /* One output per vertex after decomposition */
+   enum pipe_prim_type base = u_base_prim_type(primitive);
+   return u_vertices_for_prims(base, prims);
+}
+
+const char *u_prim_name(enum pipe_prim_type pipe_prim);
+
+
+#ifdef __cplusplus
 }
+#endif
+
 
 #endif