[Piglit] [PATCH] gl-3.1: Add test for attributeless rendering with gl_VertexID

[Chris Forbes]

This tests that rendering with no vertex attributes bound works, in the
core profile. The vertex positions are determined using gl_VertexID.

This currently provokes some bad behavior in the i965 backend --
the whole array of constant data gets spilled to scratch to support the
nonconstant index.

Signed-off-by: Chris Forbes <chrisf at ijw.co.nz>
---
 tests/all.py                               |  1 +
 tests/spec/gl-3.1/CMakeLists.gl.txt        |  1 +
 tests/spec/gl-3.1/attributeless-vertexid.c | 85 ++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 tests/spec/gl-3.1/attributeless-vertexid.c

diff --git a/tests/all.py b/tests/all.py
index 49c801a..e6134a9 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -1075,6 +1075,7 @@ for subtest in ['generated', 'written', 'flush']:
 gl31['required-renderbuffer-attachment-formats'] = concurrent_test('gl-3.0-required-renderbuffer-attachment-formats 31')
 gl31['required-sized-texture-formats'] = concurrent_test('gl-3.0-required-sized-texture-formats 31')
 gl31['required-texture-attachment-formats'] = concurrent_test('gl-3.0-required-texture-attachment-formats 31')
+gl31['attributeless-vertexid'] = concurrent_test('gl-3.1-attributeless-vertexid')
 
 gl32 = {}
 spec['!OpenGL 3.2'] = gl32
diff --git a/tests/spec/gl-3.1/CMakeLists.gl.txt b/tests/spec/gl-3.1/CMakeLists.gl.txt
index 7d835e8..cb60eb9 100644
--- a/tests/spec/gl-3.1/CMakeLists.gl.txt
+++ b/tests/spec/gl-3.1/CMakeLists.gl.txt
@@ -13,5 +13,6 @@ piglit_add_executable (gl-3.1-draw-buffers-errors draw-buffers-errors.c)
 piglit_add_executable (gl-3.1-genned-names genned-names.c)
 piglit_add_executable (gl-3.1-minmax minmax.c)
 piglit_add_executable (gl-3.1-primitive-restart-xfb primitive-restart-xfb.c)
+piglit_add_executable (gl-3.1-attributeless-vertexid attributeless-vertexid.c)
 
 # vim: ft=cmake:
diff --git a/tests/spec/gl-3.1/attributeless-vertexid.c b/tests/spec/gl-3.1/attributeless-vertexid.c
new file mode 100644
index 0000000..012c460
--- /dev/null
+++ b/tests/spec/gl-3.1/attributeless-vertexid.c
@@ -0,0 +1,85 @@
+/* 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 attributeless-vertexid.c
+ *
+ * Test that rendering with no vertex attributes (but only using gl_VertexID)
+ * works in the core profile.
+ */
+
+#include "piglit-util-gl-common.h"
+#include "minmax-test.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_core_version = 31;
+	config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+const float red[] = { 1, 0, 0, 1 };
+
+enum piglit_result
+piglit_display(void)
+{
+	bool pass;
+
+	glViewport(0, 0, piglit_width, piglit_height);
+	glClearColor(0.2, 0.2, 0.2, 0.2);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+	pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, red);
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	GLuint prog = piglit_build_simple_program(
+		"#version 140\n"
+		"const vec2 verts[4] = vec2[](\n"
+		"	vec2(-1, 1),\n"
+		"	vec2(-1,-1),\n"
+		"	vec2( 1,-1),\n"
+		"	vec2( 1, 1)\n"
+		");\n"
+		"void main() {\n"
+		"	gl_Position = vec4(verts[gl_VertexID], 0, 1);\n"
+		"}\n",
+
+		"#version 140\n"
+		"void main() {\n"
+		"	gl_FragColor = vec4(1,0,0,1);\n"
+		"}\n");
+
+	GLuint vao;
+
+	glUseProgram(prog);
+
+	glGenVertexArrays(1, &vao);
+	glBindVertexArray(vao);
+}
-- 
1.9.1