sso: Add a test that passes data using the legacy gl_TexCoord varyings.

In compatiblity profiles, the GL_ARB_separate_shader_objects extension
allows passing data via built-in varyings such as gl_TexCoord[].  We
don't do compatibility profiles, but we do expose SSO in legacy GL
contexts and allow it with GLSL 1.30 and earlier.

This test actually tries to do that in a rendering test.

This is particularly interesting because Mesa's VARYING_SLOT_* enums
handle built-in varyings different than generic ones.  I wanted to be
able to see how those came through; this provides a simple example.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

2 files changed, 111 insertions, 0 deletions

diff --git a/tests/spec/arb_separate_shader_objects/CMakeLists.gl.txt b/tests/spec/arb_separate_shader_objects/CMakeLists.gl.txt
index f7feb2749..b596f678e 100644
--- a/tests/spec/arb_separate_shader_objects/CMakeLists.gl.txt
+++ b/tests/spec/arb_separate_shader_objects/CMakeLists.gl.txt
@@ -12,6 +12,7 @@ link_libraries (
 piglit_add_executable (arb_separate_shader_object-400-combinations 400-combinations.c)
 piglit_add_executable (arb_separate_shader_object-active-sampler-conflict active-sampler-conflict.c)
 piglit_add_executable (arb_separate_shader_object-ActiveShaderProgram-invalid-program ActiveShaderProgram-invalid-program.c)
+piglit_add_executable (arb_separate_shader_object-compat-builtins compat-builtins.c)
 piglit_add_executable (arb_separate_shader_object-GetProgramPipelineiv GetProgramPipelineiv.c)
 piglit_add_executable (arb_separate_shader_object-IsProgramPipeline IsProgramPipeline.c)
 piglit_add_executable (arb_separate_shader_object-ProgramUniform-coverage ProgramUniform-coverage.c)
diff --git a/tests/spec/arb_separate_shader_objects/compat-builtins.c b/tests/spec/arb_separate_shader_objects/compat-builtins.c
new file mode 100644
index 000000000..4c1945907
--- /dev/null
+++ b/tests/spec/arb_separate_shader_objects/compat-builtins.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ * Copyright © 2015 Advanced Micro Devices, 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.
+ */
+
+/**
+ * Test separate shaders using built-in varyings, which are allowed in the
+ * compatibility profile (or GL 3.0 and earlier).
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_compat_version = 21;
+	config.supports_gl_core_version = 0;
+	config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static GLuint pipeline;
+
+static const char *vs_code =
+	"#version 110\n"
+	"#extension GL_ARB_separate_shader_objects: require\n"
+	"\n"
+	"varying vec4 gl_TexCoord[2];\n"
+	"\n"
+	"void main()\n"
+	"{\n"
+	"    gl_Position = gl_Vertex;\n"
+	"    gl_TexCoord[0] = vec4(0.1, 0.2, 0.3, 0.4);\n"
+	"    gl_TexCoord[1] = vec4(0.01, 0.02, 0.03, 0.04);\n"
+	"}\n"
+	;
+
+static const char *fs_code =
+	"#version 110\n"
+	"#extension GL_ARB_separate_shader_objects: require\n"
+	"\n"
+	"varying vec4 gl_TexCoord[2];\n"
+	"\n"
+	"void main()\n"
+	"{\n"
+	"    gl_FragColor = gl_TexCoord[0] + gl_TexCoord[1];\n"
+	"}\n"
+	;
+
+enum piglit_result
+piglit_display(void)
+{
+	static const float expected[] = {
+		0.11, 0.22, 0.33, 0.44
+	};
+	bool pass;
+
+	glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glBindProgramPipeline(pipeline);
+	piglit_draw_rect(-1, -1, 2, 2);
+
+	pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height,
+				      expected);
+
+	piglit_present_results();
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void piglit_init(int argc, char **argv)
+{
+	GLuint vs_prog, fs_prog;
+
+	piglit_require_extension("GL_ARB_separate_shader_objects");
+
+	vs_prog = glCreateShaderProgramv(GL_VERTEX_SHADER, 1,
+					 (const GLchar *const*) &vs_code);
+	piglit_link_check_status(vs_prog);
+
+	fs_prog = glCreateShaderProgramv(GL_FRAGMENT_SHADER, 1,
+					 (const GLchar *const *) &fs_code);
+	piglit_link_check_status(fs_prog);
+
+	glGenProgramPipelines(1, &pipeline);
+	glUseProgramStages(pipeline, GL_VERTEX_SHADER_BIT, vs_prog);
+	glUseProgramStages(pipeline, GL_FRAGMENT_SHADER_BIT, fs_prog);
+	piglit_program_pipeline_check_status(pipeline);
+
+	if (!piglit_check_gl_error(0))
+		piglit_report_result(PIGLIT_FAIL);
+}