[Piglit] [PATCH V3 3/6] ARB_sample_shading: Add test to verify the functionality of gl_SampleID

Anuj Phogat anuj.phogat at gmail.com
Wed Nov 6 17:20:24 PST 2013


V2: Get rid of redundant projection matrix.
V3: Draw to a multisample texture and use it later to verify
    the expected color of each sample.
    Use piglit_draw_rect() and get rid of redundant code.

Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
---
 tests/all.tests                                    |   5 +
 .../arb_sample_shading/execution/CMakeLists.gl.txt |   1 +
 .../execution/builtin-gl-sample-id.cpp             | 216 +++++++++++++++++++++
 3 files changed, 222 insertions(+)
 create mode 100644 tests/spec/arb_sample_shading/execution/builtin-gl-sample-id.cpp

diff --git a/tests/all.tests b/tests/all.tests
index 883fbec..5f66e43 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -1342,6 +1342,11 @@ for num_samples in TEST_SAMPLE_COUNTS:
     executable = 'arb_sample_shading-{0} -auto'.format(test_name)
     arb_sample_shading[test_name] = PlainExecTest(executable)
 
+for num_samples in TEST_SAMPLE_COUNTS:
+    test_name = 'builtin-gl-sample-id {0}'.format(num_samples)
+    executable = 'arb_sample_shading-{0} -auto'.format(test_name)
+    arb_sample_shading[test_name] = PlainExecTest(executable)
+
 # Group ARB_debug_output
 arb_debug_output = Group()
 spec['ARB_debug_output'] = arb_debug_output
diff --git a/tests/spec/arb_sample_shading/execution/CMakeLists.gl.txt b/tests/spec/arb_sample_shading/execution/CMakeLists.gl.txt
index 56fa0da..35f2905 100644
--- a/tests/spec/arb_sample_shading/execution/CMakeLists.gl.txt
+++ b/tests/spec/arb_sample_shading/execution/CMakeLists.gl.txt
@@ -12,4 +12,5 @@ link_libraries (
 
 piglit_add_executable (arb_sample_shading-api api.c)
 piglit_add_executable (arb_sample_shading-builtin-gl-num-samples builtin-gl-num-samples.cpp)
+piglit_add_executable (arb_sample_shading-builtin-gl-sample-id builtin-gl-sample-id.cpp)
 # vim: ft=cmake:
diff --git a/tests/spec/arb_sample_shading/execution/builtin-gl-sample-id.cpp b/tests/spec/arb_sample_shading/execution/builtin-gl-sample-id.cpp
new file mode 100644
index 0000000..ebbb6a0
--- /dev/null
+++ b/tests/spec/arb_sample_shading/execution/builtin-gl-sample-id.cpp
@@ -0,0 +1,216 @@
+/*
+ * Copyright © 2013 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 builtin-gl-sample-id.cpp
+ *  This test verifies that using gl_SampleID in fragment shader program
+ *  works as per ARB_sample_shading specification.
+ *
+ **/
+
+#include "piglit-fbo.h"
+using namespace piglit_util_fbo;
+
+const int pattern_width = 128; const int pattern_height = 128;
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_compat_version = 21;
+
+	config.window_width = pattern_width;
+	config.window_height = pattern_height;
+	config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static int num_samples;
+static unsigned prog_0, prog_1;
+static Fbo multisampled_fbo, multisampled_tex;
+
+static void
+print_usage_and_exit(char *prog_name)
+{
+	printf("Usage: %s <num_samples>\n", prog_name);
+	piglit_report_result(PIGLIT_FAIL);
+}
+
+void
+compile_shader(void)
+{
+	static const char *vert =
+		"#version 130\n"
+		"in vec2 pos;\n"
+		"void main()\n"
+		"{\n"
+		"  gl_Position = gl_ModelViewProjectionMatrix *\n"
+		"                vec4(pos, 0.0, 1.0);\n"
+		"}\n";
+	static const char *frag_0 =
+		"#version 130\n"
+		"#extension GL_ARB_sample_shading : enable\n"
+		"uniform int samples;\n"
+		"out vec4 out_color;\n"
+		"void main()\n"
+		"{\n"
+		"  if(samples == 0)\n"
+		"    out_color = vec4(0.0, 1.0, 0.0, 1.0);\n"
+		"  else\n"
+		"    out_color = vec4(0.0, float(gl_SampleID) / samples, 0.0, 1.0);\n"
+		"}\n";
+
+	static const char *frag_1 =
+		"#version 130\n"
+		"#extension GL_ARB_texture_multisample : require\n"
+		"uniform sampler2DMS ms_tex;\n"
+		"uniform int samples;\n"
+		"out vec4 out_color;\n"
+		"void main()\n"
+		"{\n"
+		"  int i;\n"
+		"  bool pass = true;\n"
+		   /* Use a small tolerance value to account for the precision
+		    * loss in floating point color values.
+		    */
+		"  float color_tolerance = 0.02;\n"
+		"  for (i = 0; i < samples; i++) {\n"
+		"    vec4 sample_color =\n"
+		"      texelFetch(ms_tex, ivec2(gl_FragCoord.xy), i);\n"
+		"  float sample_id_float = sample_color.g * samples;\n"
+		"  int sample_id_int = int(round(sample_id_float));\n"
+		"  if (sample_id_int != i ||\n"
+		"      abs(sample_id_int - sample_id_float) > color_tolerance)\n"
+		"    pass = false;\n"
+		"  }\n"
+		"\n"
+		"  if(pass)\n"
+		"    out_color = vec4(0.0, 1.0, 0.0, 1.0);\n"
+		"  else\n"
+		"    out_color = vec4(1.0, 0.0, 0.0, 1.0);\n"
+		"}\n";
+
+	/* Compile program */
+	prog_0 = glCreateProgram();
+	GLint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
+	glAttachShader(prog_0, vs);
+	piglit_check_gl_error(GL_NO_ERROR);
+	GLint fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag_0);
+	glAttachShader(prog_0, fs);
+	glBindAttribLocation(prog_0, 0, "pos");
+	glLinkProgram(prog_0);
+	if (!piglit_link_check_status(prog_0)) {
+		piglit_report_result(PIGLIT_FAIL);
+	}
+
+	prog_1 = glCreateProgram();
+	vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
+	glAttachShader(prog_1, vs);
+	piglit_check_gl_error(GL_NO_ERROR);
+	fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag_1);
+	glAttachShader(prog_1, fs);
+	glBindAttribLocation(prog_1, 0, "pos");
+	glLinkProgram(prog_1);
+	if (!piglit_link_check_status(prog_1)) {
+		piglit_report_result(PIGLIT_FAIL);
+	}
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	if (argc != 2)
+		print_usage_and_exit(argv[0]);
+
+	/* 1st arg: num_samples */
+	char *endptr = NULL;
+	num_samples = strtol(argv[1], &endptr, 0);
+	if (endptr != argv[1] + strlen(argv[1]))
+		print_usage_and_exit(argv[0]);
+
+	piglit_require_extension("GL_ARB_texture_multisample");
+	piglit_require_extension("GL_ARB_sample_shading");
+
+	/* Skip the test if num_samples > GL_MAX_SAMPLES */
+	GLint max_samples;
+	glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
+	if (num_samples > max_samples)
+		piglit_report_result(PIGLIT_SKIP);
+
+	piglit_ortho_projection(pattern_width, pattern_height, false);
+	FboConfig msConfig(num_samples, pattern_width, pattern_height);
+	multisampled_fbo.setup(msConfig);
+        msConfig.attach_texture = true;
+	multisampled_tex.setup(msConfig);
+
+	compile_shader();
+	if (!piglit_check_gl_error(GL_NO_ERROR)) {
+		piglit_report_result(PIGLIT_FAIL);
+	}
+}
+
+enum piglit_result
+piglit_display()
+{
+	bool pass = true;
+	int samples;
+        float expected[4] = {0.0, 1.0, 0.0, 1.0};
+
+	glUseProgram(prog_0);
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
+	glGetIntegerv(GL_SAMPLES, &samples);
+	glClear(GL_COLOR_BUFFER_BIT);
+	glUniform1i(glGetUniformLocation(prog_0, "samples"), samples);
+        piglit_draw_rect(0, 0, pattern_width, pattern_height);
+
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_tex.handle);
+	glClear(GL_COLOR_BUFFER_BIT);
+	glBlitFramebuffer(0, 0,
+			  pattern_width, pattern_height,
+			  0, 0,
+			  pattern_width, pattern_height,
+			  GL_COLOR_BUFFER_BIT,
+			  GL_NEAREST);
+
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_tex.handle);
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
+	glClear(GL_COLOR_BUFFER_BIT);
+	if (samples == 0) {
+		glBlitFramebuffer(0, 0,
+				  pattern_width, pattern_height,
+				  0, 0,
+				  pattern_width, pattern_height,
+				  GL_COLOR_BUFFER_BIT,
+				  GL_NEAREST);
+	} else {
+		glUseProgram(prog_1);
+		glUniform1i(glGetUniformLocation(prog_1, "ms_tex"), 0);
+		glUniform1i(glGetUniformLocation(prog_1, "samples"), samples);
+		piglit_draw_rect_tex(0, 0, pattern_width, pattern_height,
+				     0, 0, pattern_width, pattern_height);
+	}
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
+	pass = piglit_probe_rect_rgba(0, 0, pattern_width,
+                                      pattern_width, expected)
+               && pass;
+	piglit_present_results();
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
-- 
1.8.1.4



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