[Piglit] [PATCH] texturing: Add decompression test for S3TC DXT1

[Nanley Chery]

Cc: Kenneth Graunke <kenneth at whitecape.org>
Cc: Mark Janes <mark.a.janes at intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100925
Signed-off-by: Nanley Chery <nanley.g.chery at intel.com>
---
 tests/all.py                      |  1 +
 tests/texturing/CMakeLists.gl.txt |  1 +
 tests/texturing/s3tc-targeted.c   | 99 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 101 insertions(+)
 create mode 100644 tests/texturing/s3tc-targeted.c

diff --git a/tests/all.py b/tests/all.py
index 49a8c9fbe..38aabc103 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -3303,6 +3303,7 @@ with profile.test_list.group_manager(
     g(['arb_texture_compression-invalid-formats', 's3tc'], 'invalid formats')
     g(['gen-compressed-teximage'], run_concurrent=False)
     g(['s3tc-errors'])
+    g(['s3tc-targeted'])
     g(['s3tc-teximage'], run_concurrent=False)
     g(['s3tc-texsubimage'], run_concurrent=False)
     g(['getteximage-targets', '2D', 'S3TC'])
diff --git a/tests/texturing/CMakeLists.gl.txt b/tests/texturing/CMakeLists.gl.txt
index 9ab4d7ac8..e5d41e432 100644
--- a/tests/texturing/CMakeLists.gl.txt
+++ b/tests/texturing/CMakeLists.gl.txt
@@ -64,6 +64,7 @@ ENDIF (UNIX)
 piglit_add_executable (s3tc-teximage s3tc-teximage.c)
 piglit_add_executable (fxt1-teximage fxt1-teximage.c)
 piglit_add_executable (s3tc-texsubimage s3tc-texsubimage.c)
+piglit_add_executable (s3tc-targeted s3tc-targeted.c)
 piglit_add_executable (s3tc-errors s3tc-errors.c)
 piglit_add_executable (sampler-cube-shadow sampler-cube-shadow.c)
 piglit_add_executable (streaming-texture-leak streaming-texture-leak.c)
diff --git a/tests/texturing/s3tc-targeted.c b/tests/texturing/s3tc-targeted.c
new file mode 100644
index 000000000..b86a326dc
--- /dev/null
+++ b/tests/texturing/s3tc-targeted.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright © 2017 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 s3tc-targeted.c
+ *
+ * Tests the cases of S3TC DXT1 decompression in which the bitmap contains the
+ * value b'11. The chosen tests help to determine that the color comparison
+ * portion of decompression works correctly and that any internal driver
+ * swizzling of the alpha channel is performed correctly.
+ *
+ * Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100925
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	/* We need OpenGL 1.3 for the *TexImage* functions used in this file. */
+	config.supports_gl_compat_version = 13;
+	config.requires_displayed_window = false;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static bool
+test_block(GLenum internal_fmt, const char * base_fmt_str,
+	   const uint8_t * dxt1_block, uint16_t expected_result)
+{
+	/* Upload the DXT1 block. */
+	glCompressedTexImage2D(GL_TEXTURE_2D, 0, internal_fmt, 1, 1, 0,
+			       8 /* 64 bits */, dxt1_block);
+
+	/* Decompress the only defined pixel in the DXT1 block. */
+	uint16_t actual_pixel = 0xBEEF;
+	glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4,
+	              &actual_pixel);
+
+	/* Test the result. */
+	if (actual_pixel != expected_result) {
+		fprintf(stderr, "Sampled %#.4x (R4G4B4A4_PACK32), but "
+			"expected %#.4x from %s DXT1 texture.\n",
+			actual_pixel, expected_result, base_fmt_str);
+		return false;
+	}
+
+	return true;
+}
+
+#define TEST(fmt, block, pixel) \
+	test_block(GL_COMPRESSED_ ## fmt ## _S3TC_DXT1_EXT, #fmt, block, pixel)
+
+/* Test 4 out of 16 DXT1 decompression paths:
+ *   (RGB0+2*RGB1)/3,   if color0  > color1 and code(x,y) == 3
+ *   BLACK,             if color0 <= color1 and code(x,y) == 3
+ */
+enum piglit_result
+piglit_display(void)
+{
+	/* Store the 64 bit DXT1 blocks to be tested. From the lowest address
+	 * to the highest, the following bytes of interest are stored:
+	 *    c0_lo, c0_hi, c1_lo, c1_hi, texels (0,0-4), ... 
+	 */
+	const uint8_t black_block[8]     = { 0xFF, 0xFF, 0xFF, 0xFF, 0x03, };
+	const uint8_t one_third_block[8] = { 0xFF, 0xFF,    0,    0, 0x03, };
+
+	const bool pass = TEST(RGB , black_block, 0x000F) &&
+	                  TEST(RGBA, black_block, 0x0000) &&
+	                  TEST(RGB , one_third_block, 0x555F) &&
+	                  TEST(RGBA, one_third_block, 0x555F);
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	piglit_require_extension("GL_EXT_texture_compression_s3tc");
+	
+	/* We call glCompressedTexImage2D with a non-power-of-two dimension. */
+	piglit_require_extension("GL_ARB_texture_non_power_of_two");
+}
-- 
2.12.2