[Piglit] [PATCH 3/6] ARB_pipeline_statistics_query (clip): basic test

[Ben Widawsky]

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 .../spec/arb_pipeline_statistics/CMakeLists.gl.txt |   2 +
 .../arb_pipeline_statistics/pipeline_stats_clip.c  | 126 +++++++++++++++++++++
 2 files changed, 128 insertions(+)
 create mode 100644 tests/spec/arb_pipeline_statistics/pipeline_stats_clip.c

diff --git a/tests/spec/arb_pipeline_statistics/CMakeLists.gl.txt b/tests/spec/arb_pipeline_statistics/CMakeLists.gl.txt
index d26f588..f9726e0 100644
--- a/tests/spec/arb_pipeline_statistics/CMakeLists.gl.txt
+++ b/tests/spec/arb_pipeline_statistics/CMakeLists.gl.txt
@@ -20,5 +20,7 @@ piglit_add_executable (arb_pipeline_stats_vert pipeline_stats_vert.c)
 target_link_libraries (arb_pipeline_stats_vert pipestat_help)
 piglit_add_executable (arb_pipeline_stats_vert_adj pipeline_stats_vert_adj.c)
 target_link_libraries (arb_pipeline_stats_vert_adj pipestat_help)
+piglit_add_executable (arb_pipeline_stats_clip pipeline_stats_clip.c)
+target_link_libraries (arb_pipeline_stats_clip pipestat_help)
 
 # vim: ft=cmake
diff --git a/tests/spec/arb_pipeline_statistics/pipeline_stats_clip.c b/tests/spec/arb_pipeline_statistics/pipeline_stats_clip.c
new file mode 100644
index 0000000..904b52b
--- /dev/null
+++ b/tests/spec/arb_pipeline_statistics/pipeline_stats_clip.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * 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 pipeline_stats_clip.c
+ *
+ * This test verifies that the clipper related tokens of
+ * ARB_pipeline_statistics_query() work as expected. I believe these values
+ * are safe to use on all hardware but I am not certain.
+ *
+ * As with the vertex information, there seems to be a clause which allows
+ * implementations to make non-deterministic values (13.5 quoted below).
+ *
+ * 13.5 (the chicken clause)
+ *
+ *  Implementations are allowed to pass incoming primitives unchanged and to
+ *  output multiple primitives for an incoming primitive due to implementation
+ *  dependent reasons as long as the results of rendering otherwise remain
+ *  unchanged.
+ *
+ * 13.5.2
+ *  When BeginQuery is called with a target of CLIPPING_INPUT_PRIMITIVES_ARB,
+ *  the clipping input primitives count maintained by the GL is set to zero.
+ *  When a clipping input primitives query is active, the counter is
+ *  incremented every time a primitive reaches the primitive clipping stage
+ *  (see section 13.5).
+ *
+ *  When BeginQuery is called with a target of CLIPPING_OUTPUT_PRIMITIVES_ARB,
+ *  the clipping output primitives count maintained by the GL is set to zero.
+ *  When a clipping output primitives query is active, the counter is
+ *  incremented every time a primitive passes the primitive clipping stage.
+ *  The actual number of primitives output by the primitive clipping stage for
+ *  a particular input primitive is implementation dependent (see section 13.5)
+ *  but must satisfy the following conditions.
+ *
+ * (Chicken clause 2)
+ *  If RASTERIZER_DISCARD is enabled, implementations are allowed to
+ *  discard primitives right after the optional transform feedback state
+ *  (see Section 14.1). As a result, if RASTERIZER_DISCARD is enabled,
+ *  the clipping input and output primitives count may not be
+ *  incremented.
+ *
+ * To me, this makes it sound like this is impossible to test RASTERIZER_DISCARD
+ * reliably, so I won't bother.
+ */
+
+#include "piglit-util-gl.h"
+#include "pipestat_help.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+	config.supports_gl_compat_version = 30;
+	config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
+PIGLIT_GL_TEST_CONFIG_END
+
+static const char *vs_src =
+	"#version 110                   \n"
+	"                               \n"
+	"void main()                    \n"
+	"{                              \n"
+	"   gl_Position = gl_Vertex;    \n"
+	"}                              \n";
+
+static struct query queries[] = {
+	{
+	 .query = GL_CLIPPING_INPUT_PRIMITIVES_ARB,
+	 .name = "GL_CLIPPING_INPUT_PRIMITIVES_ARB",
+	 .expected = NUM_PRIMS},
+	{
+	 .query = GL_CLIPPING_OUTPUT_PRIMITIVES_ARB,
+	 .name = "GL_CLIPPING_OUTPUT_PRIMITIVES_ARB",
+	 .expected = NUM_PRIMS}
+};
+
+enum piglit_result
+piglit_display(void)
+{
+	enum piglit_result ret = do_query(queries, ARRAY_SIZE(queries));
+#ifdef DISPLAY
+	piglit_present_results();
+#endif
+	return ret;
+}
+
+void
+piglit_init(int argc, char *argv[])
+{
+	GLuint vs, prog;
+
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+
+	piglit_require_gl_version(11);
+	piglit_require_GLSL();
+
+	do_query_init(queries, ARRAY_SIZE(queries));
+
+	vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_src);
+	prog = glCreateProgram();
+	glAttachShader(prog, vs);
+	glLinkProgram(prog);
+
+	if (!piglit_link_check_status(prog)) {
+		glDeleteProgram(prog);
+		piglit_report_result(PIGLIT_FAIL);
+	}
+
+	glUseProgram(prog);
+}
-- 
2.1.3