[Piglit] [PATCH v2] tbo: test a max-sized buffer

[Ilia Mirkin]

---

Turns out MAX_TEXTURE_BUFFER_SIZE is in *texels*, not bytes. Updated
to take that into account. Note that this causes an error in
avx_memcpy on i965 (hsw), most likely due to alignment, but I haven't
investigated...

Also, this version avoids the question of what to do with 2G+ buffers.

 tests/all.py                                       |   1 +
 .../arb_texture_buffer_object/CMakeLists.gl.txt    |   1 +
 tests/spec/arb_texture_buffer_object/max-size.c    | 106 +++++++++++++++++++++
 3 files changed, 108 insertions(+)
 create mode 100644 tests/spec/arb_texture_buffer_object/max-size.c

diff --git a/tests/all.py b/tests/all.py
index 4fbe75b..761ec5c 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -2372,6 +2372,7 @@ with profile.group_manager(
     g(['arb_texture_buffer_object-get'], 'get')
     g(['arb_texture_buffer_object-fetch-outside-bounds'],
       'fetch-outside-bounds')
+    g(['arb_texture_buffer_object-max-size'], 'max-size')
     g(['arb_texture_buffer_object-minmax'], 'minmax')
     g(['arb_texture_buffer_object-negative-bad-bo'], 'negative-bad-bo')
     g(['arb_texture_buffer_object-negative-bad-format'], 'negative-bad-format')
diff --git a/tests/spec/arb_texture_buffer_object/CMakeLists.gl.txt b/tests/spec/arb_texture_buffer_object/CMakeLists.gl.txt
index 5019e52..2971582 100644
--- a/tests/spec/arb_texture_buffer_object/CMakeLists.gl.txt
+++ b/tests/spec/arb_texture_buffer_object/CMakeLists.gl.txt
@@ -14,6 +14,7 @@ piglit_add_executable (arb_texture_buffer_object-data-sync data-sync.c)
 piglit_add_executable (arb_texture_buffer_object-dlist dlist.c)
 piglit_add_executable (arb_texture_buffer_object-formats formats.c)
 piglit_add_executable (arb_texture_buffer_object-get get.c)
+piglit_add_executable (arb_texture_buffer_object-max-size max-size.c)
 piglit_add_executable (arb_texture_buffer_object-minmax minmax.c)
 piglit_add_executable (arb_texture_buffer_object-negative-bad-bo negative-bad-bo.c)
 piglit_add_executable (arb_texture_buffer_object-negative-bad-format negative-bad-format.c)
diff --git a/tests/spec/arb_texture_buffer_object/max-size.c b/tests/spec/arb_texture_buffer_object/max-size.c
new file mode 100644
index 0000000..3cc940b
--- /dev/null
+++ b/tests/spec/arb_texture_buffer_object/max-size.c
@@ -0,0 +1,106 @@
+/* Copyright © 2015 Ilia Mirkin
+ *
+ * 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 max-size.c
+ *
+ * Tests that we can sample a maximally-sized texture buffer.
+ */
+
+#include "piglit-util-gl.h"
+
+enum piglit_result
+piglit_display(void)
+{
+	static const float green[4] = {0, 1, 0, 0};
+	bool pass;
+
+	glViewport(0, 0, piglit_width, piglit_height);
+	glClearColor(0.2, 0.2, 0.2, 0.2);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	piglit_draw_rect(-1, -1, 2, 2);
+
+	pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	static const char *vs_source =
+		"#version 140\n"
+		"in vec4 piglit_vertex;\n"
+		"void main()\n"
+		"{\n"
+		"	gl_Position = piglit_vertex;\n"
+		"}\n";
+
+	static const char *fs_source =
+		"#version 140\n"
+		"uniform samplerBuffer s;\n"
+		"uniform int offset;\n"
+		"void main()\n"
+		"{\n"
+		"	gl_FragColor = texelFetch(s, offset);\n"
+		"}\n";
+
+	GLuint tex, tbo;
+	static const uint8_t data[4] = {0x00, 0xff, 0x00, 0x00};
+	GLuint prog;
+	GLint max;
+
+	prog = piglit_build_simple_program(vs_source, fs_source);
+	glUseProgram(prog);
+
+	glGenBuffers(1, &tbo);
+	glBindBuffer(GL_TEXTURE_BUFFER, tbo);
+
+	glGenTextures(1, &tex);
+	glBindTexture(GL_TEXTURE_BUFFER, tex);
+
+	glGetIntegerv(GL_MAX_TEXTURE_BUFFER_SIZE, &max);
+
+	if (max >= 512 * 1024 * 1024) {
+		/* Buffer sizes >= 2G are a bit dicey, ideally this
+		 * test would try various formats, including GL_R8.
+		 */
+		printf("MAX_TEXTURE_BUFFER_SIZE > 512M, skipping\n");
+		piglit_report_result(PIGLIT_SKIP);
+	}
+
+	glTexBuffer(GL_TEXTURE_BUFFER, GL_RGBA8, tbo);
+	glBufferData(GL_TEXTURE_BUFFER,
+		     max * sizeof(data), NULL, GL_STATIC_READ);
+	glBufferSubData(GL_TEXTURE_BUFFER,
+			(max - 1) * sizeof(data), sizeof(data), data);
+
+	glUniform1i(glGetUniformLocation(prog, "offset"), max - 1);
+	printf("MAX_TEXTURE_BUFFER_SIZE: %d\n", max);
+}
+
+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
-- 
2.4.6