Add test verifying glDrawBuffer with different buffer modes

This test works by calling glDrawBuffer function for each color buffer mode
and testing the buffer's color value against expected value

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Ian Romanick <idr@freedesktop.org>

2 files changed, 164 insertions, 0 deletions

diff --git a/tests/bugs/CMakeLists.gl.txt b/tests/bugs/CMakeLists.gl.txt
index bce05322e..5c1864e02 100644
--- a/tests/bugs/CMakeLists.gl.txt
+++ b/tests/bugs/CMakeLists.gl.txt
@@ -16,6 +16,7 @@ link_libraries (
 
 add_executable (crash-cubemap-order crash-cubemap-order.c)
 add_executable (crash-texparameter-before-teximage crash-texparameter-before-teximage.c)
+add_executable (drawbuffer-modes drawbuffer-modes.c)
 add_executable (fdo9833 fdo9833.c)
 add_executable (fdo10370 fdo10370.c)
 add_executable (fdo14575 fdo14575.c)
diff --git a/tests/bugs/drawbuffer-modes.c b/tests/bugs/drawbuffer-modes.c
new file mode 100644
index 000000000..240782731
--- /dev/null
+++ b/tests/bugs/drawbuffer-modes.c
@@ -0,0 +1,163 @@
+/* Copyright © 2011 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 drawbuffer-modes.c
+ * Verify the functionality of glDrawBuffer() function with different color
+ * buffer modes in default framebuffer
+ *
+ * This test works by calling glDrawBuffer function for each color buffer mode
+ * and testing the buffer's color value against expected value. All the calls
+ * should ensure no error.
+ *
+ * This test case also verifies the fix for Bug 44153:
+ * https://bugs.freedesktop.org/show_bug.cgi?id=44153
+ *
+ * \Author Yi Sun <yi.sun@intel.com>, Anuj Phogat <anuj.phogat@gmail.com>
+ */
+#include "piglit-util.h"
+int piglit_width = 100, piglit_height = 100;
+int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
+
+float color[7][4] = {
+	{ 0.1, 0.2, 0.3, 1.0 },
+	{ 0.2, 0.3, 0.4, 1.0 },
+	{ 0.3, 0.4, 0.5, 1.0 },
+	{ 0.4, 0.5, 0.6, 1.0 },
+	{ 0.5, 0.6, 0.7, 1.0 },
+	{ 0.6, 0.7, 0.8, 1.0 },
+	{ 1.0, 1.0, 1.0, 1.0 } };
+
+int bufferlist[] = {
+	GL_FRONT_AND_BACK,
+	GL_BACK, GL_FRONT,
+	GL_LEFT,
+	GL_BACK_LEFT,
+	GL_FRONT_LEFT,
+	GL_NONE };
+
+enum piglit_result
+piglit_display(void)
+{
+	bool pass = true;
+	bool pixel_probe = true;
+	int i;
+	GLfloat probe[4];
+	for ( i = 0; i < ARRAY_SIZE(bufferlist); i++) {
+		glDrawBuffer(bufferlist[i]);
+		glClear(GL_COLOR_BUFFER_BIT);
+		glColor4fv(color[i]);
+		piglit_draw_rect(20, 20, 50, 50);
+		pass = piglit_check_gl_error(GL_NO_ERROR)
+		       && pass;
+		switch (bufferlist[i]) {
+		case GL_FRONT_AND_BACK:
+			glReadBuffer(GL_BACK_LEFT);
+			pass = piglit_probe_rect_rgba(20, 20, 50, 50,
+						      color[i])
+			       && pass;
+			glReadBuffer(GL_FRONT_LEFT);
+			pass = pass &&
+			       piglit_probe_rect_rgba(20, 20, 50, 50,
+						      color[i]);
+			break;
+		case GL_LEFT:
+			glReadBuffer(GL_BACK_LEFT);
+			pass = piglit_probe_rect_rgba(20, 20, 50, 50,
+						      color[i])
+			       && pass;
+			glReadBuffer(GL_FRONT_LEFT);
+			pass = piglit_probe_rect_rgba(20, 20, 50, 50,
+						      color[i])
+			       && pass;
+			break;
+		case GL_BACK:
+		case GL_BACK_LEFT:
+			glReadBuffer(bufferlist[i]);
+			pass = piglit_probe_rect_rgba(20, 20, 50, 50,
+						      color[i])
+			       && pass;
+			/* This should not modify GL_FRONT_LEFT buffer */
+			glReadBuffer(GL_FRONT_LEFT);
+			pixel_probe = piglit_probe_pixel_rgba_silent(25, 25,
+								     color[i],
+								     probe);
+			pass = !pixel_probe && pass;
+			if(pixel_probe)
+				printf("glDrawBuffer(GL_BACK) modifies"
+				       " GL_FRONT_LEFT buffer\n");
+			break;
+		case GL_FRONT:
+		case GL_FRONT_LEFT:
+			glReadBuffer(bufferlist[i]);
+			pass = piglit_probe_rect_rgba(20, 20, 50, 50,
+						      color[i])
+			       && pass;
+			/* This should not modify GL_BACK_LEFT buffer */
+			glReadBuffer(GL_BACK_LEFT);
+			pixel_probe = piglit_probe_pixel_rgba_silent(25, 25,
+								     color[i],
+								     probe);
+			pass = !pixel_probe && pass;
+			if(pixel_probe)
+				printf("glDrawBuffer(GL_FRONT) modifies"
+				       " GL_BACK_LEFT buffer\n");
+			break;
+		case GL_NONE:
+			/* Drawing to a buffer GL_NONE should not
+			 * modify any existing buffers
+			 */
+			glReadBuffer(GL_BACK_LEFT);
+			pixel_probe = piglit_probe_pixel_rgba_silent(25, 25,
+								     color[i],
+								     probe);
+			pass = !pixel_probe && pass;
+			if(pixel_probe)
+				printf("glDrawBuffer(GL_NONE) modifies"
+				       " GL_BACK_LEFT buffer\n");
+			glReadBuffer(GL_FRONT_LEFT);
+			pixel_probe = piglit_probe_pixel_rgba_silent(25, 25,
+								     color[i],
+								     probe);
+			pass = !pixel_probe && pass;
+			if (pixel_probe)
+				printf("glDrawBuffer(GL_NONE) modifies"
+				       " GL_FRONT_LEFT buffer\n");
+			break;
+		}
+		pass = piglit_check_gl_error(GL_NO_ERROR)
+		       && pass;
+	}
+	return (pass ? PIGLIT_PASS : PIGLIT_FAIL);
+}
+
+void piglit_init(int argc, char **argv)
+{
+	glMatrixMode(GL_PROJECTION);
+	glPushMatrix();
+	glLoadIdentity();
+	glOrtho(0, piglit_width, 0, piglit_height, -1, 1);
+	glMatrixMode(GL_MODELVIEW);
+	glPushMatrix();
+	glLoadIdentity();
+	glClearColor(0.2, 0.2, 0.2, 1.0);
+}