[Piglit] [PATCH 5/6] ARB_sample_shading: Add test to verify the functionality of gl_SamplePosition
Anuj Phogat
anuj.phogat at gmail.com
Mon Oct 14 19:19:07 CEST 2013
Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
---
tests/all.tests | 6 +
.../arb_sample_shading/execution/CMakeLists.gl.txt | 1 +
.../execution/builtin-gl-sample-position.cpp | 240 +++++++++++++++++++++
3 files changed, 247 insertions(+)
create mode 100644 tests/spec/arb_sample_shading/execution/builtin-gl-sample-position.cpp
diff --git a/tests/all.tests b/tests/all.tests
index 673de06..562eca3 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -1342,6 +1342,12 @@ for num_samples in TEST_SAMPLE_COUNTS:
test_name)
arb_sample_shading[test_name] = PlainExecTest(executable)
+for num_samples in TEST_SAMPLE_COUNTS:
+ test_name = ' '.join(['builtin-gl-sample-position', str(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 d2f1f4a..a832189 100644
--- a/tests/spec/arb_sample_shading/execution/CMakeLists.gl.txt
+++ b/tests/spec/arb_sample_shading/execution/CMakeLists.gl.txt
@@ -14,4 +14,5 @@ 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)
piglit_add_executable (arb_sample_shading-builtin-gl-sample-mask builtin-gl-sample-mask.cpp)
+piglit_add_executable (arb_sample_shading-builtin-gl-sample-position builtin-gl-sample-position.cpp)
# vim: ft=cmake:
diff --git a/tests/spec/arb_sample_shading/execution/builtin-gl-sample-position.cpp b/tests/spec/arb_sample_shading/execution/builtin-gl-sample-position.cpp
new file mode 100644
index 0000000..ab66d28
--- /dev/null
+++ b/tests/spec/arb_sample_shading/execution/builtin-gl-sample-position.cpp
@@ -0,0 +1,240 @@
+/*
+ * 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-position.cpp
+ * This test verifies that using gl_SamplePosition 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 = 10;
+
+ 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, vao, vertex_buf;
+static Fbo multisampled_fbo, singlesampled_fbo;
+
+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"
+ "uniform mat4 proj;\n"
+ "in vec2 pos;\n"
+ "void main()\n"
+ "{\n"
+ " gl_Position = proj * vec4(pos, 0.0, 1.0);\n"
+ "}\n";
+ static const char *frag =
+ "#version 130\n"
+ "#extension GL_ARB_sample_shading : enable\n"
+ "uniform int samples;\n"
+ "out vec4 out_color;\n"
+ "void main()\n"
+ "{\n"
+ " out_color = vec4(gl_SamplePosition, 0.0, 1.0);\n"
+ "}\n";
+ /* Compile program */
+ prog = glCreateProgram();
+ GLint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
+ glAttachShader(prog, vs);
+ piglit_check_gl_error(GL_NO_ERROR);
+ GLint fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag);
+ glAttachShader(prog, fs);
+ glBindAttribLocation(prog, 0, "pos");
+ glLinkProgram(prog);
+ if (!piglit_link_check_status(prog)) {
+ piglit_report_result(PIGLIT_FAIL);
+ }
+
+ /* Set up vertex array object */
+ glGenVertexArrays(1, &vao);
+ glBindVertexArray(vao);
+
+ /* Set up vertex input buffer */
+ glGenBuffers(1, &vertex_buf);
+ glBindBuffer(GL_ARRAY_BUFFER, vertex_buf);
+ glEnableVertexAttribArray(0);
+ glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float),
+ (void *) 0);
+
+ /* Set up element input buffer to tesselate a quad into
+ * triangles
+ */
+ unsigned int indices[6] = { 0, 1, 2, 0, 2, 3 };
+ GLuint element_buf;
+ glGenBuffers(1, &element_buf);
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, element_buf);
+ glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices,
+ GL_STATIC_DRAW);
+}
+
+void
+draw_pattern(GLint samples)
+{
+ const float proj[4][4] = {
+ { 1, 0, 0, 0 },
+ { 0, 1, 0, 0 },
+ { 0, 0, 1, 0 },
+ { 0, 0, 0, 1 }};
+
+ float vertex_data[4][4] = {
+ { -1, -1 },
+ { -1, 1 },
+ { 1, 1 },
+ { 1, -1 }};
+
+ glUseProgram(prog);
+ glBindVertexArray(vao);
+
+ /* Set up uniforms */
+ glUseProgram(prog);
+ glUniform1i(glGetUniformLocation(prog, "samples"), samples);
+ glUniformMatrix4fv(glGetUniformLocation(prog, "proj"), 1,
+ GL_TRUE, &proj[0][0]);
+
+ glBindBuffer(GL_ARRAY_BUFFER, vertex_buf);
+ glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_data), vertex_data,
+ GL_STREAM_DRAW);
+ glDrawElements(GL_TRIANGLES, 6 , GL_UNSIGNED_INT, (void *) 0);
+}
+
+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_gl_version(21);
+ piglit_require_extension("GL_ARB_vertex_array_object");
+ 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);
+
+ singlesampled_fbo.setup(FboConfig(0,
+ pattern_width,
+ pattern_height));
+
+ FboConfig msConfig(num_samples, pattern_width, pattern_height);
+ multisampled_fbo.setup(msConfig);
+
+ compile_shader();
+ if (!piglit_check_gl_error(GL_NO_ERROR)) {
+ piglit_report_result(PIGLIT_FAIL);
+ }
+}
+
+bool test_ms_blit_scaled(Fbo ms_fbo)
+{
+ GLint samples;
+ GLfloat sample_pos[2];
+ GLfloat expected[4] = {0.0, 0.0, 0.0, 1.0};
+ bool pass = true;
+
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle);
+ glGetIntegerv(GL_SAMPLES, &samples);
+
+ /* Expected color is computed after taking in to account multisample
+ * color resolve:
+ * ((sample_pos0 + sample_pos1 + sample_pos2 + sample_pos3) / 4.0)
+ */
+ for(int i = 0; i < samples; i++) {
+ glGetMultisamplefv(GL_SAMPLE_POSITION, i, sample_pos);
+ expected[0] += sample_pos[0];
+ expected[1] += sample_pos[1];
+// printf("sample[%d]_pos = {%f, %f}\n",
+// i, sample_pos[0], sample_pos[1]);
+ }
+ expected[0] /= samples;
+ expected[1] /= samples;
+ expected[2] = 0.0;
+ expected[3] = 1.0;
+
+ glClear(GL_COLOR_BUFFER_BIT);
+ draw_pattern( samples);
+
+ glBindFramebuffer(GL_READ_FRAMEBUFFER, ms_fbo.handle);
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.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, singlesampled_fbo.handle);
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
+
+ pass = piglit_probe_rect_rgba(0, 0, pattern_width,
+ pattern_width, expected)
+ && pass;
+ glClear(GL_COLOR_BUFFER_BIT);
+ glBlitFramebuffer(0, 0,
+ pattern_width, pattern_height,
+ 0, 0,
+ pattern_width, pattern_height,
+ GL_COLOR_BUFFER_BIT,
+ GL_NEAREST);
+
+ piglit_present_results();
+ return pass;
+}
+
+enum piglit_result
+piglit_display()
+{
+ bool pass = true;
+ pass = test_ms_blit_scaled(multisampled_fbo)
+ && pass;
+ return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
--
1.8.1.4
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