[PATCH] Add an infinite spot light test case

[Yuanhan Liu]

Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
---
 tests/all.tests                     |    1 +
 tests/general/CMakeLists.gl.txt     |    1 +
 tests/general/infinite-spot-light.c |   99 +++++++++++++++++++++++++++++++++++
 3 files changed, 101 insertions(+), 0 deletions(-)
 create mode 100644 tests/general/infinite-spot-light.c

diff --git a/tests/all.tests b/tests/all.tests
index 2a85b7a..664a9b4 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -254,6 +254,7 @@ add_plain_test(general, 'geterror-invalid-enum')
 add_plain_test(general, 'geterror-inside-begin')
 add_plain_test(general, 'gl30basic')
 add_plain_test(general, 'hiz')
+add_plain_test(general, 'infinite-spot-light')
 add_plain_test(general, 'isbufferobj')
 add_plain_test(general, 'line-aa-width')
 add_plain_test(general, 'linestipple')
diff --git a/tests/general/CMakeLists.gl.txt b/tests/general/CMakeLists.gl.txt
index 8ff3771..2cfc7be 100644
--- a/tests/general/CMakeLists.gl.txt
+++ b/tests/general/CMakeLists.gl.txt
@@ -62,6 +62,7 @@ if (UNIX)
 	target_link_libraries (hiz m)
 endif (UNIX)
 add_executable (early-z early-z.c)
+add_executable (infinite-spot-light infinite-spot-light.c)
 add_executable (isbufferobj isbufferobj.c)
 add_executable (linestipple linestipple.c)
 add_executable (line-aa-width line-aa-width.c)
diff --git a/tests/general/infinite-spot-light.c b/tests/general/infinite-spot-light.c
new file mode 100644
index 0000000..cb8616f
--- /dev/null
+++ b/tests/general/infinite-spot-light.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 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.
+ *
+ * Authors:
+ *    Yuanhan Liu <yuanhan.liu at linux.intel.com>
+ */
+
+/** @file infinite-spot-light.c
+ *
+ * This is a case that sounds doesn't make sense, but it is allowed by glSpec
+ * (see section 2.14.1 Lightin of glspec 2.1.pdf).  While writing this case,
+ * it servers as two purposes:
+ *
+ *   1. Test if swrast is OK with this case.
+ *      The old mesa code would always compute a zero attenuation, thus always
+ *      get a black lighting color.
+ *
+ *   2. Test if hardware rendering(only i965 tested) is OK with this patch.
+ *      The old mesa code would skip the attenuation and spot computation while
+ *      infinite light is met. This is somehow not permitted by glSpec.
+ */
+
+#include "piglit-util.h"
+
+int piglit_width = 100, piglit_height = 100;
+int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
+
+/* Already normalized, and 0.5 would be the expected color */
+static GLfloat dir[3] = {0.866025404, 0.0, 0.5};
+static GLfloat pos[4] = {0.0, 0.0, -1.0, 0.0};		/* infinite */
+static GLfloat light_ambient[3] = {1.0, 0.0, 0.0};
+
+enum piglit_result
+piglit_display(void)
+{
+	GLboolean pass = GL_TRUE;
+	GLfloat expected[4] = {0.5, 0.0, 0.0, 1.0};
+
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glPointSize(10);
+	glBegin(GL_POINTS);
+		glVertex2f(0.5, 0.5);
+	glEnd();
+
+	pass = piglit_probe_pixel_rgba(0, 0, expected);
+
+	glutSwapBuffers();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+	GLfloat buf[4] = {0.0, 0.0, 0.0, 1.0};
+
+	glEnable(GL_LIGHT0);
+	glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 89.0);
+	glLightf(GL_LIGHT0, GL_SPOT_EXPONENT, 1.0);
+	glLightfv(GL_LIGHT0, GL_POSITION, pos);
+	glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, dir);
+	glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
+
+	glLightModelfv(GL_LIGHT_MODEL_AMBIENT, buf);
+	glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 0);
+
+	glMaterialfv(GL_FRONT, GL_DIFFUSE, buf);
+	glMaterialfv(GL_FRONT, GL_SPECULAR, buf);
+
+	buf[0] = 1.0;
+	buf[1] = 1.0;
+	buf[2] = 1.0;
+	glMaterialfv(GL_FRONT, GL_AMBIENT, buf);
+
+	glEnable(GL_LIGHTING);
+
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+}
-- 
1.7.4.4