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src/gallium/auxiliary/draw/draw_pipe_validate.c

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+/**************************************************************************
+ *
+ * Copyright 2007 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * 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 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.
+ *
+ **************************************************************************/
+
+/* Authors:  Keith Whitwell <[email protected]>
+ */
+
+#include "util/u_memory.h"
+#include "util/u_math.h"
+#include "util/u_prim.h"
+#include "pipe/p_defines.h"
+#include "draw_private.h"
+#include "draw_pipe.h"
+#include "draw_context.h"
+#include "draw_vbuf.h"
+
+
+/**
+ * Default version of a function to check if we need any special
+ * pipeline stages, or whether prims/verts can go through untouched.
+ * Don't test for bypass clipping or vs modes, this function is just
+ * about the primitive pipeline stages.
+ *
+ * This can be overridden by the driver.
+ */
+bool
+draw_need_pipeline(const struct draw_context *draw,
+                   const struct pipe_rasterizer_state *rasterizer,
+                   enum mesa_prim prim)
+{
+   unsigned reduced_prim = u_reduced_prim(prim);
+
+   /* If the driver has overridden this, use that version:
+    */
+   if (draw->render && draw->render->need_pipeline) {
+      return draw->render->need_pipeline(draw->render, rasterizer, prim);
+   }
+
+   /* Don't have to worry about triangles turning into lines/points
+    * and triggering the pipeline, because we have to trigger the
+    * pipeline *anyway* if unfilled mode is active.
+    */
+   if (reduced_prim == MESA_PRIM_LINES) {
+      /* line stipple */
+      if (rasterizer->line_stipple_enable && draw->pipeline.line_stipple)
+         return true;
+
+      /* wide lines */
+      if (roundf(rasterizer->line_width) > draw->pipeline.wide_line_threshold)
+         return true;
+
+      /* AA lines */
+      if ((!rasterizer->multisample && rasterizer->line_smooth) && draw->pipeline.aaline)
+         return true;
+
+      if (draw_current_shader_num_written_culldistances(draw))
+         return true;
+   } else if (reduced_prim == MESA_PRIM_POINTS) {
+      /* large points */
+      if (rasterizer->point_size > draw->pipeline.wide_point_threshold)
+         return true;
+
+      /* sprite points */
+      if (rasterizer->point_quad_rasterization
+          && draw->pipeline.wide_point_sprites)
+         return true;
+
+      /* AA points */
+      if ((!rasterizer->multisample && rasterizer->point_smooth) && draw->pipeline.aapoint)
+         return true;
+
+      /* point sprites */
+      if (rasterizer->sprite_coord_enable && draw->pipeline.point_sprite)
+         return true;
+
+      if (draw_current_shader_num_written_culldistances(draw))
+         return true;
+   } else if (reduced_prim == MESA_PRIM_TRIANGLES) {
+      /* polygon stipple */
+      if (rasterizer->poly_stipple_enable && draw->pipeline.pstipple)
+         return true;
+
+      /* unfilled polygons */
+      if (rasterizer->fill_front != PIPE_POLYGON_MODE_FILL ||
+          rasterizer->fill_back != PIPE_POLYGON_MODE_FILL)
+         return true;
+
+      /* polygon offset */
+      if (rasterizer->offset_point ||
+          rasterizer->offset_line ||
+          rasterizer->offset_tri)
+         return true;
+
+      /* two-side lighting */
+      if (rasterizer->light_twoside)
+         return true;
+
+      if (draw_current_shader_num_written_culldistances(draw))
+         return true;
+   }
+
+   /* polygon cull - this is difficult - hardware can cull just fine
+    * most of the time (though sometimes CULL_NEITHER is unsupported.
+    *
+    * Generally this isn't a reason to require the pipeline, though.
+    *
+   if (rasterizer->cull_mode)
+      return TRUE;
+   */
+
+   return false;
+}
+
+
+
+/**
+ * Rebuild the rendering pipeline.
+ */
+static struct draw_stage *
+validate_pipeline(struct draw_stage *stage)
+{
+   struct draw_context *draw = stage->draw;
+   struct draw_stage *next = draw->pipeline.rasterize;
+   bool need_det = false;
+   bool precalc_flat = false;
+   bool wide_lines, wide_points;
+   const struct pipe_rasterizer_state *rast = draw->rasterizer;
+
+   /* Set the validate's next stage to the rasterize stage, so that it
+    * can be found later if needed for flushing.
+    */
+   stage->next = next;
+
+   /* drawing wide, non-AA lines? */
+   wide_lines = rast->line_width != 1.0f &&
+                roundf(rast->line_width) > draw->pipeline.wide_line_threshold &&
+                (!rast->line_smooth || rast->multisample);
+
+   /* drawing large/sprite points (but not AA points)? */
+   if (rast->sprite_coord_enable && draw->pipeline.point_sprite)
+      wide_points = true;
+   else if ((!rast->multisample && rast->point_smooth) && draw->pipeline.aapoint)
+      wide_points = false;
+   else if (rast->point_size > draw->pipeline.wide_point_threshold)
+      wide_points = true;
+   else if (rast->point_quad_rasterization && draw->pipeline.wide_point_sprites)
+      wide_points = true;
+   else
+      wide_points = false;
+
+   /*
+    * NOTE: we build up the pipeline in end-to-start order.
+    *
+    * TODO: make the current primitive part of the state and build
+    * shorter pipelines for lines & points.
+    */
+
+   if ((!rast->multisample && rast->line_smooth) && draw->pipeline.aaline) {
+      draw->pipeline.aaline->next = next;
+      next = draw->pipeline.aaline;
+      precalc_flat = true;
+   }
+
+   if ((!rast->multisample && rast->point_smooth) && draw->pipeline.aapoint) {
+      draw->pipeline.aapoint->next = next;
+      next = draw->pipeline.aapoint;
+   }
+
+   if (wide_lines) {
+      draw->pipeline.wide_line->next = next;
+      next = draw->pipeline.wide_line;
+      precalc_flat = true;
+   }
+
+   if (wide_points) {
+      draw->pipeline.wide_point->next = next;
+      next = draw->pipeline.wide_point;
+   }
+
+   if (rast->line_stipple_enable && draw->pipeline.line_stipple) {
+      draw->pipeline.stipple->next = next;
+      next = draw->pipeline.stipple;
+      precalc_flat = true;		/* only needed for lines really */
+   }
+
+   if (rast->poly_stipple_enable
+       && draw->pipeline.pstipple) {
+      draw->pipeline.pstipple->next = next;
+      next = draw->pipeline.pstipple;
+   }
+
+   if (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
+       rast->fill_back != PIPE_POLYGON_MODE_FILL) {
+      draw->pipeline.unfilled->next = next;
+      next = draw->pipeline.unfilled;
+      precalc_flat = true;		/* only needed for triangles really */
+      need_det = true;
+   }
+
+   if (precalc_flat) {
+      /*
+       * could only run the stage if either rast->flatshade is true
+       * or there's constant interpolated values.
+       */
+      draw->pipeline.flatshade->next = next;
+      next = draw->pipeline.flatshade;
+   }
+
+   if (rast->offset_point ||
+       rast->offset_line ||
+       rast->offset_tri) {
+      draw->pipeline.offset->next = next;
+      next = draw->pipeline.offset;
+      need_det = true;
+   }
+
+   if (rast->light_twoside) {
+      draw->pipeline.twoside->next = next;
+      next = draw->pipeline.twoside;
+      need_det = true;
+   }
+
+   /* Always run the cull stage as we calculate determinant there
+    * also.
+    *
+    * This can actually be a win as culling out the triangles can lead
+    * to less work emitting vertices, smaller vertex buffers, etc.
+    * It's difficult to say whether this will be true in general.
+    */
+   if (need_det || rast->cull_face != PIPE_FACE_NONE) {
+      draw->pipeline.cull->next = next;
+      next = draw->pipeline.cull;
+   }
+
+   /* Clip stage
+    */
+   if (draw->clip_xy || draw->clip_z || draw->clip_user) {
+      draw->pipeline.clip->next = next;
+      next = draw->pipeline.clip;
+   }
+
+   if (draw_current_shader_num_written_culldistances(draw)) {
+      draw->pipeline.user_cull->next = next;
+      next = draw->pipeline.user_cull;
+   }
+
+   draw->pipeline.first = next;
+
+   if (0) {
+      debug_printf("draw pipeline:\n");
+      for (next = draw->pipeline.first; next ; next = next->next)
+         debug_printf("   %s\n", next->name);
+      debug_printf("\n");
+   }
+
+   return draw->pipeline.first;
+}
+
+
+static void
+validate_tri(struct draw_stage *stage,
+             struct prim_header *header)
+{
+   struct draw_stage *pipeline = validate_pipeline(stage);
+   pipeline->tri(pipeline, header);
+}
+
+
+static void
+validate_line(struct draw_stage *stage,
+              struct prim_header *header)
+{
+   struct draw_stage *pipeline = validate_pipeline(stage);
+   pipeline->line(pipeline, header);
+}
+
+
+static void
+validate_point(struct draw_stage *stage,
+               struct prim_header *header)
+{
+   struct draw_stage *pipeline = validate_pipeline(stage);
+   pipeline->point(pipeline, header);
+}
+
+
+static void
+validate_reset_stipple_counter(struct draw_stage *stage)
+{
+   struct draw_stage *pipeline = validate_pipeline(stage);
+   pipeline->reset_stipple_counter(pipeline);
+}
+
+
+static void
+validate_flush(struct draw_stage *stage,
+               unsigned flags)
+{
+   /* May need to pass a backend flush on to the rasterize stage.
+    */
+   if (stage->next)
+      stage->next->flush(stage->next, flags);
+}
+
+
+static void
+validate_destroy(struct draw_stage *stage)
+{
+   FREE(stage);
+}
+
+
+/**
+ * Create validate pipeline stage.
+ */
+struct draw_stage *
+draw_validate_stage(struct draw_context *draw)
+{
+   struct draw_stage *stage = CALLOC_STRUCT(draw_stage);
+   if (!stage)
+      return NULL;
+
+   stage->draw = draw;
+   stage->name = "validate";
+   stage->next = NULL;
+   stage->point = validate_point;
+   stage->line = validate_line;
+   stage->tri = validate_tri;
+   stage->flush = validate_flush;
+   stage->reset_stipple_counter = validate_reset_stipple_counter;
+   stage->destroy = validate_destroy;
+
+   return stage;
+}