[Piglit] [PATCH] gl-1.2: Test normal rescaling with fixed function pipeline.

[Fabian Bieler]

Set up scene with diffuse lighting and an isotropic modelview scale of 100.
Set the light color to 1% red, 100% green, 0% blue.
If the normal is incorectly scaled in either direction, the sampled color
would be black or yellow, respectively, instead of green.
---
 tests/all.py                        |  1 +
 tests/spec/gl-1.2/CMakeLists.gl.txt |  1 +
 tests/spec/gl-1.2/rescale-normal.c  | 76 +++++++++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+)
 create mode 100644 tests/spec/gl-1.2/rescale-normal.c

diff --git a/tests/all.py b/tests/all.py
index cf15640..155ee2a 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -1103,6 +1103,7 @@ with profile.test_list.group_manager(
     g(['lodclamp-between'])
     g(['lodclamp-between-max'])
     g(['mipmap-setup'])
+    g(['gl-1.2-rescale_normal'])
     g(['tex-skipped-unit'])
     g(['tex3d'])
     g(['tex3d-maxsize'], run_concurrent=False)
diff --git a/tests/spec/gl-1.2/CMakeLists.gl.txt b/tests/spec/gl-1.2/CMakeLists.gl.txt
index 029c54b..ce291da 100644
--- a/tests/spec/gl-1.2/CMakeLists.gl.txt
+++ b/tests/spec/gl-1.2/CMakeLists.gl.txt
@@ -8,6 +8,7 @@ link_libraries (
 	${OPENGL_gl_LIBRARY}
 )
 
+piglit_add_executable (gl-1.2-rescale-normal rescale-normal.c)
 piglit_add_executable (gl-1.2-texture-base-level texture-base-level.c)
 
 # vim: ft=cmake:
diff --git a/tests/spec/gl-1.2/rescale-normal.c b/tests/spec/gl-1.2/rescale-normal.c
new file mode 100644
index 0000000..c011018
--- /dev/null
+++ b/tests/spec/gl-1.2/rescale-normal.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright © 2017 Fabian Bieler
+ *
+ * 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 rescale-normal.c:  Rescale normals with fixed function pipeline.
+ *
+ * Set up scene with diffuse lighting and an isotropic modelview scale of 100.
+ * Set the light color to 1% red, 100% green, 0% blue.
+ * If the normal is incorectly scaled in either direction, the sampled color
+ * would be black or yellow, respectively, instead of green.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_compat_version = 12;
+	config.window_visual = (PIGLIT_GL_VISUAL_RGB);
+	config.khr_no_error_support = PIGLIT_NO_ERRORS;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static const float green_with_a_smitch_of_red[] = {0.01, 1, 0, 1};
+
+enum piglit_result
+piglit_display(void)
+{
+	piglit_draw_rect(-0.01, -0.01, 0.02, 0.02);
+	bool pass = piglit_probe_pixel_rgb(piglit_width / 2,
+					   piglit_height / 2,
+					   green_with_a_smitch_of_red);
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	const float black[] = {0, 0, 0, 1};
+	const float white[] = {1, 1, 1, 1};
+
+	glEnable(GL_LIGHTING);
+	glEnable(GL_LIGHT0);
+
+	glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, black);
+	glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, white);
+
+	glLightfv(GL_LIGHT0, GL_DIFFUSE, green_with_a_smitch_of_red);
+
+	glScalef(100.0, 100.0, 100.0);
+	glEnable(GL_RESCALE_NORMAL);
+
+	glNormal3f(0, 0, 1);
+}
-- 
2.7.4