[Piglit] [PATCH 2/2] general: Add a scissored depth clear test that uses negative x, y scissors.

[Matt Turner]

---
 tests/general/CMakeLists.gl.txt                 |   1 +
 tests/general/scissor-depth-clear-negative-xy.c | 104 ++++++++++++++++++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 tests/general/scissor-depth-clear-negative-xy.c

diff --git a/tests/general/CMakeLists.gl.txt b/tests/general/CMakeLists.gl.txt
index 3a46fb0..a5badb9 100644
--- a/tests/general/CMakeLists.gl.txt
+++ b/tests/general/CMakeLists.gl.txt
@@ -103,6 +103,7 @@ piglit_add_executable (scissor-bitmap scissor-bitmap.c)
 piglit_add_executable (scissor-clear scissor-clear.c)
 piglit_add_executable (scissor-copypixels scissor-copypixels.c)
 piglit_add_executable (scissor-depth-clear scissor-depth-clear.c)
+piglit_add_executable (scissor-depth-clear-negative-xy scissor-depth-clear-negative-xy.c)
 piglit_add_executable (scissor-many scissor-many.c)
 piglit_add_executable (scissor-offscreen scissor-offscreen.c)
 piglit_add_executable (scissor-polygon scissor-polygon.c)
diff --git a/tests/general/scissor-depth-clear-negative-xy.c b/tests/general/scissor-depth-clear-negative-xy.c
new file mode 100644
index 0000000..47202ca
--- /dev/null
+++ b/tests/general/scissor-depth-clear-negative-xy.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright © 2009, 2016 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.
+ *
+ * Authors:
+ *    Eric Anholt <eric at anholt.net>
+ *    Matt Turner <mattst88 at gmail.com>
+ *
+ */
+
+/** @file scissor-depth-clear-negative-xy.c
+ *
+ * Tests that glScissor properly affects glClear(GL_DEPTH_BUFFER_BIT) when
+ * x or y is negative.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_compat_version = 10;
+
+	config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_STENCIL;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+enum piglit_result
+piglit_display(void)
+{
+	GLboolean pass = GL_TRUE;
+	static float green[] = {0.0, 1.0, 0.0, 0.0};
+	static float blue[]  = {0.0, 0.0, 1.0, 0.0};
+
+	/* whole window green -- depth fail will be this. */
+	glClearColor(0.0, 1.0, 0.0, 0.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	/* Clear depth to 0 (fail) */
+	glClearDepth(0.0);
+	glClear(GL_DEPTH_BUFFER_BIT);
+
+	/* Clear depth quad the size of the fb at -16, -16 to be drawn blue. */
+	glEnable(GL_SCISSOR_TEST);
+	glScissor(-16, -16, piglit_width, piglit_height);
+	glClearDepth(1.0);
+	glClear(GL_DEPTH_BUFFER_BIT);
+
+	/* Now draw a quad midway between 0.0 and 1.0 depth so only that
+	 * scissored depth clear will get rasterized.
+	 */
+	glEnable(GL_DEPTH_TEST);
+	glDisable(GL_SCISSOR_TEST);
+	glDepthFunc(GL_LESS);
+	glColor4fv(blue);
+	piglit_draw_rect(0, 0, piglit_width, piglit_height);
+
+	pass &= piglit_probe_rect_rgb(0, 0, piglit_width - 16, piglit_height - 16, blue);
+
+	pass &= piglit_probe_rect_rgb(piglit_width - 16, 0, 16, piglit_height, green);
+	pass &= piglit_probe_rect_rgb(0, piglit_height - 16, piglit_width - 16, 16, green);
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+static void reshape(int width, int height)
+{
+	piglit_width = width;
+	piglit_height = height;
+
+	glViewport(0, 0, width, height);
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+
+	glOrtho(0.0, width, 0.0, height, -1.0, 1.0);
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	reshape(piglit_width, piglit_height);
+}
-- 
2.7.3