[Piglit] [PATCH 2/2] arb_texture_buffer_object: New test for rendering with no BO bound.

[Eric Anholt]

---
 .../arb_texture_buffer_object/CMakeLists.gl.txt    |    1 +
 .../spec/arb_texture_buffer_object/render-no-bo.c  |  145 ++++++++++++++++++++
 2 files changed, 146 insertions(+)
 create mode 100644 tests/spec/arb_texture_buffer_object/render-no-bo.c

diff --git a/tests/spec/arb_texture_buffer_object/CMakeLists.gl.txt b/tests/spec/arb_texture_buffer_object/CMakeLists.gl.txt
index 67213da..83d953e 100644
--- a/tests/spec/arb_texture_buffer_object/CMakeLists.gl.txt
+++ b/tests/spec/arb_texture_buffer_object/CMakeLists.gl.txt
@@ -17,5 +17,6 @@ piglit_add_executable (arb_texture_buffer_object-minmax minmax.c)
 piglit_add_executable (arb_texture_buffer_object-negative-bad-bo negative-bad-bo.c)
 piglit_add_executable (arb_texture_buffer_object-negative-bad-format negative-bad-format.c)
 piglit_add_executable (arb_texture_buffer_object-negative-bad-target negative-bad-target.c)
+piglit_add_executable (arb_texture_buffer_object-render-no-bo render-no-bo.c)
 piglit_add_executable (arb_texture_buffer_object-unused-name unused-name.c)
 piglit_add_executable (arb_texture_buffer_object-fetch-outside-bounds fetch-outside-bounds.c)
diff --git a/tests/spec/arb_texture_buffer_object/render-no-bo.c b/tests/spec/arb_texture_buffer_object/render-no-bo.c
new file mode 100644
index 0000000..9c3d2cd
--- /dev/null
+++ b/tests/spec/arb_texture_buffer_object/render-no-bo.c
@@ -0,0 +1,145 @@
+/* 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 render-no-bo.c
+ *
+ * Tests that we can sample from the default texture buffer or a
+ * texture buffer with no buffer bound, and not crash.
+ *
+ * From the GL_ARB_texture_buffer_object spec:
+ *
+ *     "If no buffer object is bound to the buffer texture, the
+ *      results of the texel access are undefined."
+ *
+ * we interpret this as allowing any result to come back, but not
+ * terminate the program.  To test that, we glReadPixels the result
+ * but don't test the values returned.
+ */
+
+#include "piglit-util-gl-common.h"
+
+enum piglit_result
+piglit_display(void)
+{
+	static const char *vs_source =
+		"#version 140\n"
+		"in vec4 vertex;\n"
+		"void main()\n"
+		"{\n"
+		"	gl_Position = vertex;\n"
+		"}\n";
+
+	static const char *fs_source =
+		"#version 140\n"
+		"uniform samplerBuffer s;\n"
+		"void main()\n"
+		"{\n"
+		"	gl_FragColor = texelFetch(s, 4096);\n"
+		"}\n";
+
+	GLuint tex, vbo;
+	uint8_t junk[4];
+	static const GLfloat verts[8] = {
+		-1, -1,
+		 1, -1,
+		 1,  1,
+		-1,  1
+	};
+	int vertex_location;
+	GLuint fs, vs, prog;
+
+	vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
+	fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_source);
+	if (!vs || !fs)
+		piglit_report_result(PIGLIT_FAIL);
+
+	prog = piglit_link_simple_program(vs, fs);
+	if (!prog)
+		piglit_report_result(PIGLIT_FAIL);
+	glUseProgram(prog);
+
+	vertex_location = glGetAttribLocation(prog, "vertex");
+
+	if (piglit_get_gl_version() >= 31) {
+		GLuint vao;
+		glGenVertexArrays(1, &vao);
+		glBindVertexArray(vao);
+	}
+	glGenBuffers(1, &vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_READ);
+	glVertexAttribPointer(vertex_location, 2, GL_FLOAT,
+			      GL_FALSE, 0, NULL);
+	glEnableVertexAttribArray(vertex_location);
+
+	/* First, draw with no texture buffer bound (so using the
+	 * default texture buffer object)
+	 */
+	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+	glReadPixels(0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, &junk);
+
+	/* Now, do it again with a texture buffer that doesn't have
+	 * any buffer bound yet.
+	 */
+	glGenTextures(1, &tex);
+	glBindTexture(GL_TEXTURE_BUFFER, tex);
+
+	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+	glReadPixels(0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, &junk);
+
+	glDeleteTextures(1, &tex);
+
+	piglit_present_results();
+
+	return PIGLIT_PASS;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	piglit_require_GLSL_version(140);
+	if (piglit_get_gl_version() < 31)
+		piglit_require_extension("GL_ARB_texture_buffer_object");
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct piglit_gl_test_config config;
+
+	piglit_gl_test_config_init(&config);
+
+	config.init = piglit_init;
+	config.display = piglit_display;
+
+	config.supports_gl_compat_version = 10;
+	config.supports_gl_core_version = 31;
+
+	config.window_width = 10;
+	config.window_height = 10;
+	config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_ALPHA;
+
+	piglit_gl_test_run(argc, argv, &config);
+
+	assert(false);
+	return 0;
+}
-- 
1.7.10.4