gles-3.0: Verify gl_VertexID when used with glDrawArrays

OpenGL expects the gl_VertexID to start counting with the 'start' value
passed to glDrawArrays.

NOTE: This test currently fails on the i965 driver.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80247

3 files changed, 180 insertions, 0 deletions

diff --git a/tests/all.py b/tests/all.py
index d8ce2f990..616b67c2e 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -4033,6 +4033,7 @@ for test_mode in ['teximage', 'texsubimage']:
     test_name = 'ext_texture_array-compressed_gles3 {0}'.format(test_mode)
     gles30[test_name] = PiglitTest(test_name + ' -auto -fbo')
 gles30['texture-immutable-levels'] = concurrent_test('texture-immutable-levels_gles3')
+gles30['gl_VertexID used with glDrawArrays'] = concurrent_test('gles-3.0-drawarrays-vertexid')
 
 arb_es3_compatibility = {}
 spec['ARB_ES3_compatibility'] = arb_es3_compatibility
diff --git a/tests/spec/gles-3.0/CMakeLists.gles3.txt b/tests/spec/gles-3.0/CMakeLists.gles3.txt
index 38efbed7d..d56a43e94 100644
--- a/tests/spec/gles-3.0/CMakeLists.gles3.txt
+++ b/tests/spec/gles-3.0/CMakeLists.gles3.txt
@@ -2,6 +2,7 @@ link_libraries(
 	piglitutil_${piglit_target_api}
 	)
 
+piglit_add_executable (gles-3.0-drawarrays-vertexid drawarrays-vertexid.c)
 piglit_add_executable(minmax_${piglit_target_api} minmax.c)
 piglit_add_executable(oes_compressed_etc2_texture-miptree_gles3 oes_compressed_etc2_texture-miptree.c)
 piglit_add_executable(texture-immutable-levels_gles3 texture-immutable-levels.c)
diff --git a/tests/spec/gles-3.0/drawarrays-vertexid.c b/tests/spec/gles-3.0/drawarrays-vertexid.c
new file mode 100644
index 000000000..ebf5723b0
--- /dev/null
+++ b/tests/spec/gles-3.0/drawarrays-vertexid.c
@@ -0,0 +1,178 @@
+/* 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 drawarrays-vertexid.c
+ * Test using gl_VertexID in conjunction with glDrawArrays
+ *
+ * The value of gl_VertexID observed in the shader should start with the value
+ * of 'first' and increment from there.
+ */
+
+#include "piglit-util-gl-common.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_es_version = 30;
+	config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static const float green[]   = { 0, 1, 0, 1 };
+static const float blue[]    = { 0, 0, 1, 1 };
+static const float gold[]    = { 1, 1, 0, 1 };
+static const float magenta[] = { 1, 0, 1, 1 };
+
+enum piglit_result
+piglit_display(void)
+{
+	bool pass = true;
+	static const GLint first[] = { 4, 8, 12, 16 };
+	static const GLsizei count[] = { 4, 4, 4, 4 };
+	unsigned i;
+
+	glViewport(0, 0, piglit_width, piglit_height);
+	glClearColor(0.2, 0.2, 0.2, 0.2);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	for (i = 0; i < ARRAY_SIZE(count); i++) {
+		glDrawArrays(GL_TRIANGLE_FAN,
+			     first[i],
+			     count[i]);
+	}
+
+	pass = piglit_probe_rect_rgba(0, 0,
+				      piglit_width / 2, piglit_height /2,
+				      green)
+		&& pass;
+	pass = piglit_probe_rect_rgba(piglit_width / 2, 0,
+				      piglit_width / 2, piglit_height / 2,
+				      blue)
+		&& pass;
+	pass = piglit_probe_rect_rgba(0, piglit_height /2,
+				      piglit_width / 2, piglit_height / 2,
+				      gold)
+		&& pass;
+	pass = piglit_probe_rect_rgba(piglit_width / 2, piglit_height /2,
+				      piglit_width / 2, piglit_height / 2,
+				      magenta)
+		&& pass;
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	static const GLfloat verts[] = {
+		/* These vertices should never be accessed due to the way
+		 * glMultiDrawArrays is called.
+		 */
+		-1.0, -1.0,
+		 1.0, -1.0,
+		 1.0,  1.0,
+		-1.0,  1.0,
+
+		-1.0, -1.0,
+		 0.0, -1.0,
+		 0.0,  0.0,
+		-1.0,  0.0,
+
+		 0.0, -1.0,
+		 1.0, -1.0,
+		 1.0,  0.0,
+		 0.0,  0.0,
+
+		-1.0,  0.0,
+		 0.0,  0.0,
+		 0.0,  1.0,
+		-1.0,  1.0,
+
+		 0.0,  0.0,
+		 1.0,  0.0,
+		 1.0,  1.0,
+		 0.0,  1.0,
+	};
+
+	GLuint prog = piglit_build_simple_program(
+		"#version 300 es\n"
+		"\n"
+		"in vec4 piglit_vertex;\n"
+		"out vec3 c;\n"
+		"\n"
+		"const vec3 colors[] = vec3[](\n"
+		"	vec3(1, 0, 0),\n"
+		"	vec3(1, 0, 0),\n"
+		"	vec3(1, 0, 0),\n"
+		"	vec3(1, 0, 0),\n"
+		"\n"
+		"	vec3(0, 1, 0),\n"
+		"	vec3(0, 1, 0),\n"
+		"	vec3(0, 1, 0),\n"
+		"	vec3(0, 1, 0),\n"
+		"\n"
+		"	vec3(0, 0, 1),\n"
+		"	vec3(0, 0, 1),\n"
+		"	vec3(0, 0, 1),\n"
+		"	vec3(0, 0, 1),\n"
+		"\n"
+		"	vec3(1, 1, 0),\n"
+		"	vec3(1, 1, 0),\n"
+		"	vec3(1, 1, 0),\n"
+		"	vec3(1, 1, 0),\n"
+		"\n"
+		"	vec3(1, 0, 1),\n"
+		"	vec3(1, 0, 1),\n"
+		"	vec3(1, 0, 1),\n"
+		"	vec3(1, 0, 1)\n"
+		");\n"
+		"void main() {\n"
+		"       c = colors[gl_VertexID];\n"
+		"	gl_Position = piglit_vertex;\n"
+		"}\n",
+
+		"#version 300 es\n"
+		"precision mediump float;\n"
+		"in vec3 c;\n"
+		"out vec4 fragcolor;\n"
+		"\n"
+		"void main() {\n"
+		"	fragcolor = vec4(c, 1);\n"
+		"}\n");
+
+	GLuint vao;
+	GLuint buf;
+
+	glUseProgram(prog);
+
+	glGenVertexArrays(1, &vao);
+	glBindVertexArray(vao);
+
+	glGenBuffers(1, &buf);
+	glBindBuffer(GL_ARRAY_BUFFER, buf);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts,
+		     GL_STATIC_DRAW);
+
+	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, (void *) 0);
+	glEnableVertexAttribArray(0);
+}