--- /dev/null
+/*
+ * 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"
+
+
+GLAPI void GLAPIENTRY
+_mesa_BeginConditionalRender(GLuint queryId, GLenum mode)
+{
+ struct gl_query_object *q;
+ GET_CURRENT_CONTEXT(ctx);
+
+ if (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);
+}
+
+
+GLAPI void APIENTRY
+_mesa_EndConditionalRender(void)
+{
+ GET_CURRENT_CONTEXT(ctx);
+
+ if (!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 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;
+ }
+}
--- /dev/null
+/*
+ * 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.
+ */
+
+#ifndef CONDRENDER_H
+#define CONDRENDER_H
+
+
+#include "glheader.h"
+#include "context.h"
+
+
+extern void GLAPIENTRY
+_mesa_BeginConditionalRender(GLuint queryId, GLenum mode);
+
+extern void APIENTRY
+_mesa_EndConditionalRender(void);
+
+extern GLboolean
+_mesa_check_conditional_render(GLcontext *ctx);
+
+
+#endif /* CONDRENDER_H */
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