1 files changed, 147 insertions, 0 deletions
diff --git a/src/mesa/main/condrender.c b/src/mesa/main/condrender.c
new file mode 100644
index 00000000000..8d9a91d5478
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+++ b/src/mesa/main/condrender.c
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+/*
+ * Mesa 3-D graphics library
+ * Version:  7.8
+ *
+ * Copyright (C) 2009  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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+/**
+ * \file condrender.c
+ * Conditional rendering functions
+ *
+ * \author Brian Paul
+ */
+
+#include "glheader.h"
+#include "condrender.h"
+#include "enums.h"
+#include "queryobj.h"
+
+
+void GLAPIENTRY
+_mesa_BeginConditionalRender(GLuint queryId, GLenum mode)
+{
+   struct gl_query_object *q;
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (!ctx->Extensions.NV_conditional_render || ctx->Query.CondRenderQuery) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
+      return;
+   }
+
+   ASSERT(ctx->Query.CondRenderMode == GL_NONE);
+
+   switch (mode) {
+   case GL_QUERY_WAIT:
+   case GL_QUERY_NO_WAIT:
+   case GL_QUERY_BY_REGION_WAIT:
+   case GL_QUERY_BY_REGION_NO_WAIT:
+      /* OK */
+      break;
+   default:
+      _mesa_error(ctx, GL_INVALID_ENUM, "glBeginConditionalRender(mode=%s)",
+                  _mesa_lookup_enum_by_nr(mode));
+      return;
+   }
+
+   q = _mesa_lookup_query_object(ctx, queryId);
+   if (!q) {
+      _mesa_error(ctx, GL_INVALID_VALUE,
+                  "glBeginConditionalRender(bad queryId=%u)", queryId);
+      return;
+   }
+   ASSERT(q->Id == queryId);
+
+   if (q->Target != GL_SAMPLES_PASSED) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
+      return;
+   }
+
+   ctx->Query.CondRenderQuery = q;
+   ctx->Query.CondRenderMode = mode;
+
+   if (ctx->Driver.BeginConditionalRender)
+      ctx->Driver.BeginConditionalRender(ctx, q, mode);
+}
+
+
+void APIENTRY
+_mesa_EndConditionalRender(void)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   FLUSH_VERTICES(ctx, 0x0);
+
+   if (!ctx->Extensions.NV_conditional_render || !ctx->Query.CondRenderQuery) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glEndConditionalRender()");
+      return;
+   }
+
+   if (ctx->Driver.EndConditionalRender)
+      ctx->Driver.EndConditionalRender(ctx, ctx->Query.CondRenderQuery);
+
+   ctx->Query.CondRenderQuery = NULL;
+   ctx->Query.CondRenderMode = GL_NONE;
+}
+
+
+/**
+ * This function is called by software rendering commands (all point,
+ * line triangle drawing, glClear, glDrawPixels, glCopyPixels, and
+ * glBitmap, glBlitFramebuffer) to determine if subsequent drawing
+ * commands should be
+ * executed or discarded depending on the current conditional
+ * rendering state.  Ideally, this check would be implemented by the
+ * GPU when doing hardware rendering.  XXX should this function be
+ * called via a new driver hook?
+ *
+ * \return GL_TRUE if we should render, GL_FALSE if we should discard
+ */
+GLboolean
+_mesa_check_conditional_render(GLcontext *ctx)
+{
+   struct gl_query_object *q = ctx->Query.CondRenderQuery;
+
+   if (!q) {
+      /* no query in progress - draw normally */
+      return GL_TRUE;
+   }
+
+   switch (ctx->Query.CondRenderMode) {
+   case GL_QUERY_BY_REGION_WAIT:
+      /* fall-through */
+   case GL_QUERY_WAIT:
+      if (!q->Ready) {
+         ctx->Driver.WaitQuery(ctx, q);
+      }
+      return q->Result > 0;
+   case GL_QUERY_BY_REGION_NO_WAIT:
+      /* fall-through */
+   case GL_QUERY_NO_WAIT:
+      return q->Ready ? (q->Result > 0) : GL_TRUE;
+   default:
+      _mesa_problem(ctx, "Bad cond render mode %s in "
+                    " _mesa_check_conditional_render()",
+                    _mesa_lookup_enum_by_nr(ctx->Query.CondRenderMode));
+      return GL_TRUE;
+   }
+}