[Piglit] [PATCH 1/1] Add a small test for gl_Fog.scale when fog start and end are equal.

[Henri Verbeet]

Signed-off-by: Henri Verbeet <hverbeet at gmail.com>
---
 tests/all.tests                  |    1 +
 tests/shaders/CMakeLists.gl.txt  |    1 +
 tests/shaders/glsl-fs-fogscale.c |   86 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+)
 create mode 100644 tests/shaders/glsl-fs-fogscale.c

diff --git a/tests/all.tests b/tests/all.tests
index 128de58..e395865 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -261,6 +261,7 @@ add_plain_test(shaders, 'glsl-fs-discard-02')
 add_plain_test(shaders, 'glsl-fs-exp2')
 add_plain_test(shaders, 'glsl-fs-flat-color')
 add_plain_test(shaders, 'glsl-fs-fogcolor-statechange')
+add_plain_test(shaders, 'glsl-fs-fogscale')
 add_plain_test(shaders, 'glsl-fs-fragcoord')
 add_plain_test(shaders, 'glsl-fs-fragcoord-zw-ortho')
 add_plain_test(shaders, 'glsl-fs-fragcoord-zw-perspective')
diff --git a/tests/shaders/CMakeLists.gl.txt b/tests/shaders/CMakeLists.gl.txt
index 5de5b95..ccd228a 100644
--- a/tests/shaders/CMakeLists.gl.txt
+++ b/tests/shaders/CMakeLists.gl.txt
@@ -72,6 +72,7 @@ piglit_add_executable (glsl-fs-color-matrix glsl-fs-color-matrix.c)
 piglit_add_executable (glsl-fs-exp2 glsl-fs-exp2.c)
 piglit_add_executable (glsl-fs-flat-color glsl-fs-flat-color.c)
 piglit_add_executable (glsl-fs-fogcolor-statechange glsl-fs-fogcolor-statechange.c)
+piglit_add_executable (glsl-fs-fogscale glsl-fs-fogscale.c)
 piglit_add_executable (glsl-fs-fragcoord glsl-fs-fragcoord.c)
 piglit_add_executable (glsl-fs-fragcoord-zw-ortho glsl-fs-fragcoord-zw-ortho.c)
 piglit_add_executable (glsl-fs-fragcoord-zw-perspective glsl-fs-fragcoord-zw-perspective.c)
diff --git a/tests/shaders/glsl-fs-fogscale.c b/tests/shaders/glsl-fs-fogscale.c
new file mode 100644
index 0000000..cb4bdf5
--- /dev/null
+++ b/tests/shaders/glsl-fs-fogscale.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright © 2013 Henri Verbeet <hverbeet at gmail.com>
+ *
+ * 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 glsl-fs-fogscale.c
+ *
+ * Tests that gl_Fog.scale is equivalent to
+ * "1.0 / (gl_Fog.end - gl_Fog.start)" when fog start and end are equal.
+ */
+
+#include "piglit-util-gl-common.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_compat_version = 10;
+
+	config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+enum piglit_result
+piglit_display(void)
+{
+	static const float green[] = {0.0f, 1.0f, 0.0f, 1.0f};
+	static const float red[] = {1.0f, 0.0f, 0.0f, 1.0f};
+	GLboolean pass = GL_TRUE;
+
+	glClearColor(0.0, 0.0, 1.0, 0.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	piglit_draw_rect(-1, -1, 2, 2);
+	pass &= piglit_probe_rect_rgba(0, 0,
+				       piglit_width / 2, piglit_height,
+				       green);
+	pass &= piglit_probe_rect_rgba(piglit_width / 2, 0,
+				       piglit_width / 2, piglit_height,
+				       red);
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	static const char vs_source[] =
+		"void main()\n"
+		"{\n"
+		"	gl_Position = gl_Vertex;\n"
+		"	gl_FogFragCoord = gl_Position.x;\n"
+		"}\n";
+	static const char fs_source[] =
+		"void main()\n"
+		"{\n"
+		"	gl_FragColor = vec4(gl_FogFragCoord * gl_Fog.scale * vec2(1.0, -1.0), 0.0, 1.0);\n"
+		"}\n";
+	GLuint prog;
+
+	piglit_require_gl_version(20);
+
+	prog = piglit_build_simple_program(vs_source, fs_source);
+
+	glFogf(GL_FOG_START, 0.0f);
+	glFogf(GL_FOG_END, 0.0f);
+	glUseProgram(prog);
+}
-- 
1.7.10.4