From 84ad0b3abe16021b238ad1b287b0c43a01fd32bd Mon Sep 17 00:00:00 2001
From: Owen W. Taylor <otaylor@fishsoup.net>
Date: Sat, 20 Nov 2010 15:55:05 -0500
Subject: [PATCH] Add a test for a ARBfp program sampling from an alpha texture

The R600 gallium driver is currently failing to correctly sample
alpha from an alpha-only texture in an ARBfp shader. This adds a
'fp-formats' test that currently tests only that, but could be
extended to test sampling from other types of non-RGBA textures.
---
 tests/shaders/CMakeLists.txt |    1 +
 tests/shaders/fp-formats.c   |   99 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 100 insertions(+), 0 deletions(-)
 create mode 100644 tests/shaders/fp-formats.c

diff --git a/tests/shaders/CMakeLists.txt b/tests/shaders/CMakeLists.txt
index 51e7607..439e617 100644
--- a/tests/shaders/CMakeLists.txt
+++ b/tests/shaders/CMakeLists.txt
@@ -32,6 +32,7 @@ add_executable (fp-abs-02 fp-abs-02.c)
 add_executable (fp-condition_codes-01 fp-condition_codes-01.c)
 add_executable (fp-lit-mask fp-lit-mask.c)
 add_executable (fp-fog fp-fog.c)
+add_executable (fp-formats fp-formats.c)
 add_executable (fp-fragment-position fp-fragment-position.c)
 add_executable (fp-generic fp-generic.c)
 add_executable (fp-kil fp-kil.c)
diff --git a/tests/shaders/fp-formats.c b/tests/shaders/fp-formats.c
new file mode 100644
index 0000000..ea86088
--- /dev/null
+++ b/tests/shaders/fp-formats.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright © 2009 Intel Corporation
+ * Copyright © 2010 Red Hat, Inc.
+ *
+ * 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 fp-formats.c
+ * Test fragment programs sampling from different texture formats.
+ * (currently just alpha-only textures)
+ */
+
+#include "piglit-util.h"
+#include "piglit-framework.h"
+
+int piglit_window_mode = GLUT_DOUBLE;
+int piglit_width = 100;
+int piglit_height = 100;
+
+/**
+ * Modulate the primary color with the alpha channel of the texture
+ */
+static const char alpha_source[] =
+	"!!ARBfp1.0\n"
+        "TEMP texel0;\n"
+        "TEX texel0,fragment.texcoord[0],texture[0],2D;\n"
+        "MOV result.color, texel0.abgr;\n"
+	"END"
+	;
+
+static GLint progs[1];
+static GLuint textures[1];
+
+enum piglit_result
+piglit_display(void)
+{
+	enum piglit_result result = PIGLIT_SUCCESS;
+
+	const GLfloat expected[4] = { 0.5, 0.0, 0.0, 0.0 };
+
+	glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, progs[0]);
+
+	glClear(GL_COLOR_BUFFER_BIT);
+	glEnable(GL_FRAGMENT_PROGRAM_ARB);
+
+	piglit_draw_rect(0, 0, piglit_width, piglit_height);
+
+	if (!piglit_probe_pixel_rgb(piglit_width / 2,
+				    piglit_height / 2,
+				    expected))
+	  result = PIGLIT_FAILURE;
+
+	glutSwapBuffers();
+	return result;
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+	const GLfloat alpha_data[] = { 0.5 };
+
+	(void) argc;
+	(void) argv;
+
+	piglit_require_fragment_program();
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+
+	progs[0] = piglit_compile_program(GL_FRAGMENT_PROGRAM_ARB,
+					  alpha_source);
+
+	glGenTextures(1, textures);
+
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, progs[0]);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 1, 1, 0, GL_ALPHA, GL_FLOAT, alpha_data);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+	glClearColor(1.0, 1.0, 1.0, 1.0);
+}
-- 
1.7.3.2