depth-clamp-range: New test for ARB_depth_clamp vs glDepthRange.

PlaneShift encountered bugs with changes to the 965 driver for
ARB_depth_clamp.  This should catch those bugs plus others found on
code inspection in both software mesa and 965.

3 files changed, 138 insertions, 0 deletions

diff --git a/tests/all.tests b/tests/all.tests
index 95d743195..731aef92a 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -78,6 +78,7 @@ add_plain_test(general, 'bgra-vert-attrib-pointer')
 add_plain_test(general, 'clear-varray-2.0')
 add_plain_test(general, 'depthrange-clear')
 add_plain_test(general, 'depth_clamp')
+add_plain_test(general, 'depth-clamp-range')
 add_plain_test(general, 'dlist-clear')
 add_plain_test(general, 'dlist-fdo3129-01')
 add_plain_test(general, 'dlist-fdo3129-02')
diff --git a/tests/general/CMakeLists.txt b/tests/general/CMakeLists.txt
index fea44abe2..884dce5da 100644
--- a/tests/general/CMakeLists.txt
+++ b/tests/general/CMakeLists.txt
@@ -22,6 +22,7 @@ link_libraries (
 add_executable (bgra-vert-attrib-pointer bgra-vert-attrib-pointer.c)
 add_executable (bgra-sec-color-pointer bgra-sec-color-pointer.c)
 add_executable (clear-varray-2.0 clear-varray-2.0.c)
+add_executable (depth-clamp-range depth-clamp-range.c)
 add_executable (dlist-clear dlist-clear.c)
 add_executable (dlist-fdo3129-01 dlist-fdo3129-01.c)
 add_executable (dlist-fdo3129-02 dlist-fdo3129-02.c)
diff --git a/tests/general/depth-clamp-range.c b/tests/general/depth-clamp-range.c
new file mode 100644
index 000000000..6999bd591
--- /dev/null
+++ b/tests/general/depth-clamp-range.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright © 2009 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@anholt.net>
+ */
+
+/** @file depth-clamp-range.c
+ *
+ * Tests that ARB_depth_clamp enablement didn't break DepthRange functionality,
+ * and properly uses the min/max selection.
+ */
+
+#include "piglit-util.h"
+
+int piglit_width = 150, piglit_height = 150;
+int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH;
+
+/* In case the headers have the old enum name but not the new */
+#ifndef GL_DEPTH_CLAMP
+#define GL_DEPTH_CLAMP GL_DEPTH_CLAMP_NV
+#endif
+
+void
+piglit_init(int argc, char **argv)
+{
+	piglit_require_extension("GL_ARB_depth_clamp");
+
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+}
+
+void
+quad(float base_x, float base_y, float z)
+{
+	glBegin(GL_QUADS);
+	glVertex3f(base_x,      base_y,      z);
+	glVertex3f(base_x + 10, base_y,      z);
+	glVertex3f(base_x + 10, base_y + 10, z);
+	glVertex3f(base_x,      base_y + 10, z);
+	glEnd();
+}
+
+enum piglit_result
+piglit_display(void)
+{
+	GLboolean pass = GL_TRUE;
+	float white[3] = {1.0, 1.0, 1.0};
+	float clear[3] = {0.0, 0.0, 0.0};
+
+	glClearDepth(0.5);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glEnable(GL_DEPTH_TEST);
+	glDepthFunc(GL_LEQUAL);
+
+	glColor4fv(white);
+
+	/* Keep in mind that the ortho projection flips near and far's signs,
+	 * so 1.0 to quad()'s z maps to glDepthRange's near, and -1.0 maps to
+	 * glDepthRange's far.
+	 */
+
+	/* Basic glDepthRange testing. */
+	glDisable(GL_DEPTH_CLAMP);
+	glDepthRange(0, 1);
+	quad(10, 10, 0.5); /* .25 - drawn. */
+
+	glDepthRange(1, 0);
+	quad(10, 30, 0.5); /* 0.75 - not drawn. */
+
+	/* Now, test that near depth clamping works.*/
+	glEnable(GL_DEPTH_CLAMP);
+	glDepthRange(0.25, 1.0);
+	quad(30, 10, 2); /* 0.25 - drawn. */
+
+	glDepthRange(0.75, 1.0);
+	quad(30, 30, 2); /* 0.75 - not drawn. */
+
+	/* Test that far clamping works.*/
+	glDepthRange(0.0, 0.25);
+	quad(50, 10, -2); /* 0.25 - drawn. */
+
+	glDepthRange(0.0, 0.75);
+	quad(50, 30, -2); /* 0.75 - not drawn. */
+
+	/* Now, flip near and far around and make sure that it's doing the
+	 * min/max of near and far in the clamping.
+	 */
+
+	/* Test that near (max) clamping works. */
+	glDepthRange(0.25, 0.0);
+	quad(70, 10, 2); /* 0.25 - drawn. */
+
+	glDepthRange(0.75, 0.0);
+	quad(70, 30, 2); /* 0.75 - not drawn. */
+
+	/* Now, test far (min) clamping works. */
+	glDepthRange(1.0, 0.0);
+	quad(90, 10, -2); /* 0.0 - drawn */
+
+	glDepthRange(1.0, 0.75);
+	quad(90, 30, -2); /* 0.75 - not drawn*/
+
+	pass = piglit_probe_pixel_rgb(15, 15, white) && pass;
+	pass = piglit_probe_pixel_rgb(15, 35, clear) && pass;
+	pass = piglit_probe_pixel_rgb(35, 15, white) && pass;
+	pass = piglit_probe_pixel_rgb(35, 35, clear) && pass;
+	pass = piglit_probe_pixel_rgb(55, 15, white) && pass;
+	pass = piglit_probe_pixel_rgb(55, 35, clear) && pass;
+	pass = piglit_probe_pixel_rgb(75, 15, white) && pass;
+	pass = piglit_probe_pixel_rgb(75, 35, clear) && pass;
+	pass = piglit_probe_pixel_rgb(95, 15, white) && pass;
+	pass = piglit_probe_pixel_rgb(95, 35, clear) && pass;
+
+	glutSwapBuffers();
+
+	return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
+}