[Piglit] [PATCH 4/4] GL_ARB_sampler_objects/framebufferblit: New interaction test.

[Eric Anholt]

Mesa metaops failed to detach the user's sampler state, resulting in
the app's state (particularly the filters and sRGB decode) affecting
the blit.
---
 tests/all.tests                                  |    1 +
 tests/spec/arb_sampler_objects/CMakeLists.gl.txt |    1 +
 tests/spec/arb_sampler_objects/framebufferblit.c |  106 ++++++++++++++++++++++
 3 files changed, 108 insertions(+)
 create mode 100644 tests/spec/arb_sampler_objects/framebufferblit.c

diff --git a/tests/all.tests b/tests/all.tests
index 8ccfa19..c96fb65 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -1173,6 +1173,7 @@ spec['ARB_sampler_objects'] = arb_sampler_objects
 add_plain_test(arb_sampler_objects, 'sampler-objects')
 add_plain_test(arb_sampler_objects, 'sampler-incomplete')
 arb_sampler_objects['GL_EXT_texture_sRGB_decode'] = concurrent_test('arb_sampler_objects-srgb-decode')
+arb_sampler_objects['framebufferblit'] = plain_test('arb_sampler_objects-framebufferblit')
 
 # Group ARB_debug_output
 arb_debug_output = Group()
diff --git a/tests/spec/arb_sampler_objects/CMakeLists.gl.txt b/tests/spec/arb_sampler_objects/CMakeLists.gl.txt
index 1f73034..c58f6f4 100644
--- a/tests/spec/arb_sampler_objects/CMakeLists.gl.txt
+++ b/tests/spec/arb_sampler_objects/CMakeLists.gl.txt
@@ -12,5 +12,6 @@ link_libraries (
 piglit_add_executable (sampler-objects sampler-objects.c)
 piglit_add_executable (sampler-incomplete sampler-incomplete.c)
 piglit_add_executable (arb_sampler_objects-srgb-decode srgb-decode.c)
+piglit_add_executable (arb_sampler_objects-framebufferblit framebufferblit.c)
 
 # vim: ft=cmake:
diff --git a/tests/spec/arb_sampler_objects/framebufferblit.c b/tests/spec/arb_sampler_objects/framebufferblit.c
new file mode 100644
index 0000000..162525c
--- /dev/null
+++ b/tests/spec/arb_sampler_objects/framebufferblit.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright © 2012 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.
+ */
+
+/**
+ * @file framebufferblit.c
+ *
+ * Tests interaction between GL_ARB_sampler_objects and
+ * GL_EXT_framebuffer_blit.  There was a bug in mesa in which the
+ * fbblit would accidentally apply an active sampler object from a
+ * texture.
+ *
+ * To test this, ask for a nearest blit stretching from single pixel
+ * to the window, and check if the LINEAR on the sampler object makes
+ * the neighbors of that pixel get filtered in.
+ */
+
+#include "piglit-util-gl-common.h"
+#include "piglit-framework.h"
+
+PIGLIT_GL_TEST_MAIN(
+    16 /*window_width*/,
+    16 /*window_height*/,
+
+    GLUT_DOUBLE | GLUT_RGB | GLUT_ALPHA)
+
+enum piglit_result
+piglit_display(void)
+{
+	bool pass = true;
+	GLuint tex, sampler, fb;
+	const float tex_data[16] = {0, 1, 0, 0,
+				    1, 0, 0, 0,
+				    1, 0, 0, 0,
+				    1, 0, 0, 0};
+	const float *green = tex_data;
+
+	glClearColor(0, 0, 1, 0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glGenTextures(1, &tex);
+	glBindTexture(GL_TEXTURE_2D, tex);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 2, 2, 0,
+		     GL_RGBA, GL_FLOAT, tex_data);
+
+	glGenFramebuffers(1, &fb);
+	glBindFramebuffer(GL_FRAMEBUFFER, fb);
+
+	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
+				  GL_COLOR_ATTACHMENT0_EXT,
+				  GL_TEXTURE_2D,
+				  tex,
+				  0);
+	assert(glGetError() == 0);
+
+	glGenSamplers(1, &sampler);
+	glSamplerParameteri(sampler, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glSamplerParameteri(sampler, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glBindSampler(0, sampler);
+
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, fb);
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+	glBlitFramebuffer(0, 0, 1, 1,
+			  0, 0, piglit_width, piglit_height,
+			  GL_COLOR_BUFFER_BIT, GL_NEAREST);
+
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
+	piglit_present_results();
+
+	glDeleteSamplers(1, &sampler);
+	glDeleteTextures(1, &tex);
+	glDeleteFramebuffers(1, &fb);
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+	piglit_require_extension("GL_ARB_sampler_objects");
+	piglit_require_extension("GL_EXT_framebuffer_blit");
+	piglit_require_extension("GL_EXT_texture_swizzle");
+
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+}
-- 
1.7.10.4