[Piglit] [PATCH 11/15] arb_direct_state_access: Add test for glDrawBuffer/glReadBuffer.

[Laura Ekstrand]

This lays the groundwork for testing NamedFramebufferDrawBuffer,
NamedFramebufferDrawBuffers, and NamedFramebufferReadBuffer.
---
 tests/all.py                                       |   1 +
 .../spec/arb_direct_state_access/CMakeLists.gl.txt |   1 +
 tests/spec/arb_direct_state_access/drawbuffers.c   | 110 +++++++++++++++++++++
 3 files changed, 112 insertions(+)
 create mode 100644 tests/spec/arb_direct_state_access/drawbuffers.c

diff --git a/tests/all.py b/tests/all.py
index ffa5b2e..0ed7cfb 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -4034,6 +4034,7 @@ spec['ARB_direct_state_access']['checkfbstatus-errors'] = PiglitGLTest(['arb_dir
 spec['ARB_direct_state_access']['fbattachmentparam-errors'] = PiglitGLTest(['arb_direct_state_access-fbattachmentparam-errors'], run_concurrent=True)
 spec['ARB_direct_state_access']['invalidateframebuffer'] = PiglitGLTest(['arb_direct_state_access-invalidateframebuffer'], run_concurrent=True)
 spec['ARB_direct_state_access']['clearnamedframebuffer'] = PiglitGLTest(['arb_direct_state_access-clearnamedframebuffer'], run_concurrent=True)
+spec['ARB_direct_state_access']['drawbuffers'] = PiglitGLTest(['arb_direct_state_access-drawbuffers'], run_concurrent=True)
 
 arb_shader_image_load_store = spec['ARB_shader_image_load_store']
 arb_shader_image_load_store['atomicity'] = PiglitGLTest(['arb_shader_image_load_store-atomicity'], run_concurrent=True)
diff --git a/tests/spec/arb_direct_state_access/CMakeLists.gl.txt b/tests/spec/arb_direct_state_access/CMakeLists.gl.txt
index f83dc01..c283321 100644
--- a/tests/spec/arb_direct_state_access/CMakeLists.gl.txt
+++ b/tests/spec/arb_direct_state_access/CMakeLists.gl.txt
@@ -31,6 +31,7 @@ piglit_add_executable (arb_direct_state_access-checkfbstatus-errors checkfbstatu
 piglit_add_executable (arb_direct_state_access-fbattachmentparam-errors fbattachmentparam-errors.c)
 piglit_add_executable (arb_direct_state_access-invalidateframebuffer invalidateframebuffer.c)
 piglit_add_executable (arb_direct_state_access-clearnamedframebuffer clearnamedframebuffer.c)
+piglit_add_executable (arb_direct_state_access-drawbuffers drawbuffers.c)
 piglit_add_executable (arb_direct_state_access-dsa-textures dsa-textures.c dsa-utils.c)
 piglit_add_executable (arb_direct_state_access-texturesubimage texturesubimage.c)
 piglit_add_executable (arb_direct_state_access-bind-texture-unit bind-texture-unit.c)
diff --git a/tests/spec/arb_direct_state_access/drawbuffers.c b/tests/spec/arb_direct_state_access/drawbuffers.c
new file mode 100644
index 0000000..6e7ecf5
--- /dev/null
+++ b/tests/spec/arb_direct_state_access/drawbuffers.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright © 2015 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 drawbuffers.c
+ *
+ * Tests explicitly setting the read and draw framebuffers.
+ *
+ * Somewhat inspired by tests/general/read-front.c.
+ */
+
+#include "piglit-util-gl.h"
+#include "dsa-utils.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_compat_version = 32;
+
+	config.window_visual = PIGLIT_GL_VISUAL_RGBA |
+			       PIGLIT_GL_VISUAL_DOUBLE;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static bool pass = true;
+
+void
+piglit_init(int argc, char **argv)
+{
+	piglit_require_extension("GL_ARB_direct_state_access");
+}
+
+static GLuint fbo;
+
+static void
+clear_to_color(float color[4], int att)
+{
+	glClearColor(color[0], color[1], color[2], color[3]);
+	glDrawBuffer(GL_COLOR_ATTACHMENT0 + att);
+	glClear(GL_COLOR_BUFFER_BIT);
+}
+
+static void
+clear_subtest(float color[4], int att, const char *test_name)
+{
+	glReadBuffer(GL_COLOR_ATTACHMENT0 + att);
+	piglit_check_gl_error(GL_NO_ERROR);
+	SUBTESTCONDITION(piglit_probe_rect_rgb(0, 0, piglit_width,
+			 piglit_height, color), pass, test_name);
+}
+
+enum piglit_result
+piglit_display(void)
+{
+	float red[]	= {1.0, 0.0, 0.0, 0.0};
+	float green[]	= {0.0, 1.0, 0.0, 0.0};
+	float blue[]	= {0.0, 0.0, 1.0, 0.0};
+	GLuint textures[3];
+	int i;
+
+	/* Make a custom framebuffer with three color attachments */
+	glCreateFramebuffers(1, &fbo);
+	glCreateTextures(GL_TEXTURE_2D, 3, textures);
+	for (i = 0; i < 3; ++i) {
+		glTextureStorage2D(textures[i], 1, GL_RGBA8,
+				   piglit_width, piglit_height);
+		glNamedFramebufferTexture(fbo, GL_COLOR_ATTACHMENT0 + i,
+					  textures[i], 0);
+	}
+
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo);
+	piglit_check_gl_error(GL_NO_ERROR);
+
+	/* The clearing steps and the testing steps are separate and in a
+	 * different order to make sure that GL_COLOR_ATTACHMENT0 + att is
+	 * selecting the correct attachment.
+	 */
+	clear_to_color(green, 1);
+	clear_to_color(blue, 2);
+	clear_to_color(red, 0);
+
+	clear_subtest(blue, 2, "Clear 2 to blue");
+	clear_subtest(red, 0, "Clear 0 to red");
+	clear_subtest(green, 1, "Clear 1 to green");
+
+
+	glDeleteTextures(3, textures);
+	glDeleteFramebuffers(1, &fbo);
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
-- 
2.1.0