[Piglit] [PATCH 3/4] ext_packed_depth_stencil: new glRead/DrawPixels test

[Brian Paul]

To replace part of a glean test.
---
 .../ext_packed_depth_stencil/CMakeLists.gl.txt     |    1 +
 .../spec/ext_packed_depth_stencil/readdrawpixels.c |  117 ++++++++++++++++++++
 2 files changed, 118 insertions(+)
 create mode 100644 tests/spec/ext_packed_depth_stencil/readdrawpixels.c

diff --git a/tests/spec/ext_packed_depth_stencil/CMakeLists.gl.txt b/tests/spec/ext_packed_depth_stencil/CMakeLists.gl.txt
index a74f0bd..3bc3301 100644
--- a/tests/spec/ext_packed_depth_stencil/CMakeLists.gl.txt
+++ b/tests/spec/ext_packed_depth_stencil/CMakeLists.gl.txt
@@ -11,6 +11,7 @@ link_libraries (
 
 piglit_add_executable (ext_packed_depth_stencil-depth-stencil-texture depth-stencil-texture.c)
 piglit_add_executable (ext_packed_depth_stencil-errors errors.c)
+piglit_add_executable (ext_packed_depth_stencil-readdrawpixels readdrawpixels.c)
 piglit_add_executable (ext_packed_depth_stencil-readpixels-24_8 readpixels-24_8.c)
 piglit_add_executable (ext_packed_depth_stencil-getteximage getteximage.c)
 
diff --git a/tests/spec/ext_packed_depth_stencil/readdrawpixels.c b/tests/spec/ext_packed_depth_stencil/readdrawpixels.c
new file mode 100644
index 0000000..f11febc
--- /dev/null
+++ b/tests/spec/ext_packed_depth_stencil/readdrawpixels.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright © 2014 VMware, Inc.
+ *
+ * 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.
+ */
+
+/**
+ * Test GL_EXT_packed_depth_stencil with glRead/DrawPixels
+ * Based on an original Glean test written by Brian Paul.
+ */
+
+#include "piglit-util-gl-common.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+	config.supports_gl_compat_version = 12;
+	config.window_visual = (PIGLIT_GL_VISUAL_RGBA |
+				PIGLIT_GL_VISUAL_DEPTH |
+				PIGLIT_GL_VISUAL_STENCIL);
+PIGLIT_GL_TEST_CONFIG_END
+
+
+static bool
+test_readdrawpixels(void)
+{
+	/*reference image data */
+	static const GLuint image[4] = {
+		0x00000000,
+		0x000000ff,
+		0xffffff00,
+		0xffffffff
+	};
+	GLuint readback[4];
+	GLuint stencilMap[2] = { 2, 2 };  /* map all stencil values to 2 */
+	int i;
+
+	glWindowPos2i(0, 0);
+	glDrawPixels(2, 2, GL_DEPTH_STENCIL_EXT,
+		     GL_UNSIGNED_INT_24_8_EXT, image);
+	if (!piglit_check_gl_error(GL_NO_ERROR))
+		return false;
+
+	glReadPixels(0, 0, 2, 2, GL_DEPTH_STENCIL_EXT,
+		     GL_UNSIGNED_INT_24_8_EXT, readback);
+	if (!piglit_check_gl_error(GL_NO_ERROR))
+		return false;
+
+	for (i = 0; i < 4; i++) {
+		if (image[i] != readback[i]) {
+			printf("Image returned by glReadPixels didn't match"
+			       " the expected result (0x%x != 0x%x)",
+			       readback[i], image[i]);
+			return false;
+		}
+	}
+
+	/* test depth scale/bias and stencil mapping (in a trivial way) */
+	glPixelTransferf(GL_DEPTH_SCALE, 0.0);  /* map all depths to 1.0 */
+	glPixelTransferf(GL_DEPTH_BIAS, 1.0);
+	glPixelMapuiv(GL_PIXEL_MAP_S_TO_S, 2, stencilMap);
+	glPixelTransferi(GL_MAP_STENCIL, 1);
+	glReadPixels(0, 0, 2, 2, GL_DEPTH_STENCIL_EXT,
+		     GL_UNSIGNED_INT_24_8_EXT, readback);
+	if (!piglit_check_gl_error(GL_NO_ERROR))
+		return false;
+
+	for (i = 0; i < 4; i++) {
+		if (readback[i] != 0xffffff02) {
+			printf("Image returned by glReadPixels didn't match"
+			       " the expected result (0x%x != 0xffffff02)",
+			       readback[i]);
+			return false;
+		}
+	}
+	glPixelTransferf(GL_DEPTH_SCALE, 1.0);
+	glPixelTransferf(GL_DEPTH_BIAS, 0.0);
+	glPixelTransferi(GL_MAP_STENCIL, 0);
+
+	return true;
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+	bool pass = true;
+
+	piglit_require_extension("GL_EXT_packed_depth_stencil");
+
+	pass = test_readdrawpixels() && pass;
+
+	piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+	/* unused */
+	return PIGLIT_FAIL;
+}
-- 
1.7.10.4