Implemented GL_ARB_occlusion_query (not 100% finalized).

1 files changed, 314 insertions, 0 deletions

diff --git a/src/mesa/main/occlude.c b/src/mesa/main/occlude.c
new file mode 100644
index 00000000000..029e5d08946
--- /dev/null
+++ b/src/mesa/main/occlude.c
@@ -0,0 +1,314 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  5.1
+ *
+ * Copyright (C) 1999-2003  Brian Paul   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 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
+ * BRIAN PAUL 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 Functions to implement the GL_ARB_occlusion_query extension.
+ */
+
+
+#include "glheader.h"
+#include "context.h"
+#include "hash.h"
+#include "imports.h"
+#include "occlude.h"
+#include "mtypes.h"
+
+#ifndef GL_SAMPLES_PASSED_ARB
+#define GL_SAMPLES_PASSED_ARB         0x8914
+#define GL_QUERY_COUNTER_BITS_ARB     0x8864
+#define GL_CURRENT_QUERY_ARB          0x8865
+#define GL_QUERY_RESULT_ARB           0x8866
+#define GL_QUERY_RESULT_AVAILABLE_ARB 0x8867
+#endif
+
+
+struct occlusion_query
+{
+   GLenum Target;
+   GLuint Id;
+   GLuint PassedCounter;
+   GLboolean Active;
+};
+
+
+/**
+ * Allocate a new occlusion query object.
+ * \param target - must be GL_SAMPLES_PASSED_ARB at this time
+ * \param id - the object's ID
+ * \return pointer to new occlusion_query object or NULL if out of memory.
+ */
+static struct occlusion_query *
+new_query_object(GLenum target, GLuint id)
+{
+   struct occlusion_query *q = MALLOC_STRUCT(occlusion_query);
+   if (q) {
+      q->Target = target;
+      q->Id = id;
+      q->PassedCounter = 0;
+      q->Active = GL_FALSE;
+   }
+   return q;
+}
+
+
+/**
+ * Delete an occlusion query object.
+ */
+static void
+delete_query_object(struct occlusion_query *q)
+{
+   FREE(q);
+}
+
+
+void
+_mesa_GenQueriesARB(GLsizei n, GLuint *ids)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   GLuint first;
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (n < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glGenQueriesARB(n < 0)");
+      return;
+   }
+
+   if (ctx->Occlusion.Active) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGenQueriesARB");
+      return;
+   }
+
+   first = _mesa_HashFindFreeKeyBlock(ctx->Occlusion.QueryObjects, n);
+   if (first) {
+      GLuint i;
+      for (i = 0; i < n; i++) {
+         struct occlusion_query *q = new_query_object(GL_SAMPLES_PASSED_ARB,
+                                                      first + i);
+         if (!q) {
+            _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenQueriesARB");
+            return;
+         }
+         ids[i] = first + i;
+         _mesa_HashInsert(ctx->Occlusion.QueryObjects, first + i, q);
+      }
+   }
+}
+
+
+void
+_mesa_DeleteQueriesARB(GLsizei n, const GLuint *ids)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   GLint i;
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (n < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteQueriesARB(n < 0)");
+      return;
+   }
+
+   if (ctx->Occlusion.Active) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glDeleteQueriesARB");
+      return;
+   }
+
+   for (i = 0; i < n; i++) {
+      if (ids[i] > 0) {
+         struct occlusion_query *q = (struct occlusion_query *)
+            _mesa_HashLookup(ctx->Occlusion.QueryObjects, ids[i]);
+         if (q) {
+            _mesa_HashRemove(ctx->Occlusion.QueryObjects, ids[i]);
+            delete_query_object(q);
+         }
+      }
+   }
+}
+
+
+GLboolean
+_mesa_IsQueryARB(GLuint id)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
+
+   if (id && _mesa_HashLookup(ctx->Occlusion.QueryObjects, id))
+      return GL_TRUE;
+   else
+      return GL_FALSE;
+}
+
+
+void
+_mesa_BeginQueryARB(GLenum target, GLuint id)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct occlusion_query *q;
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   FLUSH_VERTICES(ctx, _NEW_DEPTH);
+
+   if (target != GL_SAMPLES_PASSED_ARB) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glBeginQueryARB(target)");
+      return;
+   }
+
+   if (ctx->Occlusion.CurrentQueryObject) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginQueryARB(target)");
+      return;
+   }
+
+   q = (struct occlusion_query *)
+      _mesa_HashLookup(ctx->Occlusion.QueryObjects, id);
+   if (q && q->Active) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginQueryARB");
+      return;
+   }
+   else if (!q) {
+      q = new_query_object(target, id);
+      if (!q) {
+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBeginQueryARB");
+         return;
+      }
+      _mesa_HashInsert(ctx->Occlusion.QueryObjects, id, q);
+   }
+
+   q->Active = GL_TRUE;
+   q->PassedCounter = 0;
+   ctx->Occlusion.Active = GL_TRUE;
+   ctx->Occlusion.CurrentQueryObject = id;
+   ctx->Occlusion.PassedCounter = 0;
+}
+
+
+void
+_mesa_EndQueryARB(GLenum target)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct occlusion_query *q;
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   FLUSH_VERTICES(ctx, _NEW_DEPTH);
+
+   if (target != GL_SAMPLES_PASSED_ARB) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glEndQueryARB(target)");
+      return;
+   }
+
+   q = (struct occlusion_query *)
+      _mesa_HashLookup(ctx->Occlusion.QueryObjects,
+                       ctx->Occlusion.CurrentQueryObject);
+   if (!q || !q->Active) {
+      _mesa_problem(ctx, "bad query object in glEndQueryARB");
+      return;
+   }
+
+   q->PassedCounter = ctx->Occlusion.PassedCounter;
+   q->Active = GL_FALSE;
+   ctx->Occlusion.Active = GL_FALSE;
+   ctx->Occlusion.CurrentQueryObject = 0;
+}
+
+
+void
+_mesa_GetQueryivARB(GLenum target, GLenum pname, GLint *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (target != GL_SAMPLES_PASSED_ARB) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetQueryivARB(target)");
+      return;
+   }
+
+   switch (pname) {
+      case GL_QUERY_COUNTER_BITS_ARB:
+         *params = 8 * sizeof(GLuint);
+         break;
+      case GL_CURRENT_QUERY_ARB:
+         *params = ctx->Occlusion.CurrentQueryObject;
+         break;
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glGetQueryivARB(pname)");
+         return;
+   }
+}
+
+
+void
+_mesa_GetQueryObjectivARB(GLuint id, GLenum pname, GLint *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct occlusion_query *q;
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   q = (struct occlusion_query *)
+      _mesa_HashLookup(ctx->Occlusion.QueryObjects, id);
+   if (!q || q->Active) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetQueryObjectivARB");
+      return;
+   }
+
+   switch (pname) {
+      case GL_QUERY_RESULT_ARB:
+         *params = q->PassedCounter;
+         break;
+      case GL_QUERY_RESULT_AVAILABLE_ARB:
+         /* XXX revisit when we have a hardware implementation! */
+         *params = GL_TRUE;
+         break;
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glGetQueryObjectivARB(pname)");
+         return;
+   }
+}
+
+
+void
+_mesa_GetQueryObjectuivARB(GLuint id, GLenum pname, GLuint *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct occlusion_query *q;
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   q = (struct occlusion_query *)
+      _mesa_HashLookup(ctx->Occlusion.QueryObjects, id);
+   if (!q || q->Active) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetQueryObjectuivARB");
+      return;
+   }
+
+   switch (pname) {
+      case GL_QUERY_RESULT_ARB:
+         *params = q->PassedCounter;
+         break;
+      case GL_QUERY_RESULT_AVAILABLE_ARB:
+         /* XXX revisit when we have a hardware implementation! */
+         *params = GL_TRUE;
+         break;
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glGetQueryObjectuivARB(pname)");
+         return;
+   }
+}