[Piglit] [PATCH] Test that fast color clears are resolved even if front rendering intervenes.

[Paul Berry]

---
 tests/fast_color_clear/CMakeLists.gl.txt          |  1 +
 tests/fast_color_clear/front-buffer-distraction.c | 86 +++++++++++++++++++++++
 2 files changed, 87 insertions(+)
 create mode 100644 tests/fast_color_clear/front-buffer-distraction.c

diff --git a/tests/fast_color_clear/CMakeLists.gl.txt b/tests/fast_color_clear/CMakeLists.gl.txt
index 792d42a..d1c8770 100644
--- a/tests/fast_color_clear/CMakeLists.gl.txt
+++ b/tests/fast_color_clear/CMakeLists.gl.txt
@@ -13,5 +13,6 @@ link_libraries (
 piglit_add_executable (fcc-read-after-clear read-after-clear.c)
 piglit_add_executable (fcc-read-to-pbo-after-clear read-to-pbo-after-clear.c)
 piglit_add_executable (fcc-blit-between-clears blit-between-clears.c)
+piglit_add_executable (fcc-front-buffer-distraction front-buffer-distraction.c)
 
 # vim: ft=cmake:
diff --git a/tests/fast_color_clear/front-buffer-distraction.c b/tests/fast_color_clear/front-buffer-distraction.c
new file mode 100644
index 0000000..14e9aef
--- /dev/null
+++ b/tests/fast_color_clear/front-buffer-distraction.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright © 2013 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 front-buffer-distraction.c
+ *
+ * Test that a fast color clear of the back buffer is properly
+ * resolved even if we try to "distract" the implementation by forcing
+ * a fast color clear resolve in the front buffer.  This verifies that
+ * either (a) fast color clears are independently tracked between the
+ * front and back buffers, or (b) the implementation resolves fast
+ * clears before switching from back buffer rendering to front buffer
+ * rendering.
+ *
+ * The test operates by fast clearing the back buffer, then fast
+ * clearing the front buffer, then reading from the front buffer
+ * (forcing a front buffer resolve), then reading from the back buffer
+ * (forcing a back buffer resolve).
+ */
+
+#include "piglit-util-gl-common.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+	config.supports_gl_compat_version = 11;
+	config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
+PIGLIT_GL_TEST_CONFIG_END
+
+
+void
+piglit_init(int argc, char **argv)
+{
+}
+
+enum piglit_result
+piglit_display(void)
+{
+	bool pass = true;
+	static const GLfloat green[] = { 0.0, 1.0, 0.0, 1.0 };
+	static const GLfloat red[] = { 1.0, 0.0, 0.0, 1.0 };
+
+	/* Clear the back buffer to green */
+	glClearColor(0, 1, 0, 1);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	/* Clear the front buffer to red */
+	glDrawBuffer(GL_FRONT);
+	glClearColor(1, 0, 0, 1);
+	glClear(GL_COLOR_BUFFER_BIT);
+	glDrawBuffer(GL_BACK);
+
+	/* Read from the front buffer and make sure that it's red */
+	glReadBuffer(GL_FRONT);
+	pass = piglit_probe_rect_rgba(0, 0, piglit_width,
+				      piglit_height, red) && pass;
+	glReadBuffer(GL_BACK);
+
+	/* Read from the back buffer and make sure that it's green */
+	pass = piglit_probe_rect_rgba(0, 0, piglit_width,
+				      piglit_height, green) && pass;
+
+	if (!piglit_check_gl_error(GL_NO_ERROR))
+		pass = false;
+
+	piglit_present_results();
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
-- 
1.8.3