[Piglit] [PATCH] Add a very basic version of the "primgen" test.

[Kenneth Graunke]

We already test this functionality in position.c, but I've found this
test valuable when doing hardware enabling due to its simplicity:

- No clears (since those require the pixel pipeline to work)
- No rendering (rasterizer discard is enabled)
- Minimal vertex shading.

I retained Marek's copyright since this is largely cut and pasted from
his tests (primgen.c and position.c).

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
 tests/all.py                                       |  1 +
 .../spec/ext_transform_feedback/CMakeLists.gl.txt  |  2 +
 .../pipeline-basic-primgen.c                       | 90 ++++++++++++++++++++++
 3 files changed, 93 insertions(+)
 create mode 100644 tests/spec/ext_transform_feedback/pipeline-basic-primgen.c

diff --git a/tests/all.py b/tests/all.py
index f2c5c1f..16d3cff 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -3121,6 +3121,7 @@ ext_transform_feedback['position-readback-bufferrange-discard'] = PiglitGLTest('
 
 ext_transform_feedback['negative-prims'] = PiglitGLTest('ext_transform_feedback-negative-prims', run_concurrent=True)
 ext_transform_feedback['primgen-query transform-feedback-disabled'] = PiglitGLTest('ext_transform_feedback-primgen', run_concurrent=True)
+ext_transform_feedback['pipeline-basic-primgen'] = PiglitGLTest('ext_transform_feedback-pipeline-basic-primgen', run_concurrent=True)
 
 ext_transform_feedback['position-render-bufferbase'] = PiglitGLTest('ext_transform_feedback-position render', run_concurrent=True)
 ext_transform_feedback['position-render-bufferbase-discard'] = PiglitGLTest('ext_transform_feedback-position render discard', run_concurrent=True)
diff --git a/tests/spec/ext_transform_feedback/CMakeLists.gl.txt b/tests/spec/ext_transform_feedback/CMakeLists.gl.txt
index 95af3a5..abf8ec2 100644
--- a/tests/spec/ext_transform_feedback/CMakeLists.gl.txt
+++ b/tests/spec/ext_transform_feedback/CMakeLists.gl.txt
@@ -31,6 +31,8 @@ piglit_add_executable (ext_transform_feedback-intervening-read intervening-read.
 piglit_add_executable (ext_transform_feedback-max-varyings max-varyings.c)
 piglit_add_executable (ext_transform_feedback-negative-prims negative-prims.c)
 piglit_add_executable (ext_transform_feedback-nonflat-integral nonflat-integral.c)
+piglit_add_executable (ext_transform_feedback-pipeline-basic-primgen
+pipeline-basic-primgen.c)
 piglit_add_executable (ext_transform_feedback-primgen primgen.c)
 piglit_add_executable (ext_transform_feedback-separate separate.c)
 piglit_add_executable (ext_transform_feedback-output-type output-type.c)
diff --git a/tests/spec/ext_transform_feedback/pipeline-basic-primgen.c b/tests/spec/ext_transform_feedback/pipeline-basic-primgen.c
new file mode 100644
index 0000000..e5b6a4e
--- /dev/null
+++ b/tests/spec/ext_transform_feedback/pipeline-basic-primgen.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright © 2013 Marek Olšák <maraeo at gmail.com>
+ * Copyright © 2013 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.
+ */
+
+/**
+ * Tests if PRIMITIVES_GENERATED works with transform feedback disabled.
+ *
+ * From EXT_transform_feedback:
+ *    "the primitives-generated count is incremented every time a primitive
+ *     reaches the Discarding Rasterization stage"
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_compat_version = 10;
+	config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static const char *vstext = "void main() { gl_Position = gl_Vertex; }";
+
+void piglit_init(int argc, char **argv)
+{
+	unsigned qresult;
+	int expected = 2;
+	GLuint vs;
+	GLuint prog;
+	GLuint q;
+
+	/* Check the driver. */
+	piglit_require_gl_version(15);
+	piglit_require_GLSL();
+	piglit_require_transform_feedback();
+
+	glGenQueries(1, &q);
+
+	glEnable(GL_RASTERIZER_DISCARD);
+
+	/* Create shaders. */
+	vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vstext);
+	prog = glCreateProgram();
+	glAttachShader(prog, vs);
+	glLinkProgram(prog);
+	if (!piglit_link_check_status(prog)) {
+		glDeleteProgram(prog);
+		piglit_report_result(PIGLIT_FAIL);
+	}
+	glUseProgram(prog);
+
+	/* Draw a rectangle; make sure two primitives were generated. */
+	glBeginQuery(GL_PRIMITIVES_GENERATED, q);
+	piglit_draw_rect(-1, -1, 2, 2);
+	glEndQuery(GL_PRIMITIVES_GENERATED);
+	glGetQueryObjectuiv(q, GL_QUERY_RESULT, &qresult);
+
+	if (qresult != expected) {
+		printf("Primitives generated: %i,  Expected: %i\n",
+		       qresult, expected);
+		piglit_report_result(PIGLIT_FAIL);
+	}
+
+	piglit_report_result(PIGLIT_PASS);
+}
+
+enum piglit_result piglit_display(void)
+{
+	return PIGLIT_FAIL; /* should not get here */
+}
-- 
2.1.3