[Piglit] [PATCH] arb_texture_multisample: add test to check sample positions v2
Christoph Bumiller
christoph.bumiller at speed.at
Sat Apr 6 16:19:16 PDT 2013
From: Christoph Bumiller <e0425955 at student.tuwien.ac.at>
v2: Removed dependency on TextureBarrierNV and ARB_tfb_2, added
comments.
---
.../spec/arb_texture_multisample/CMakeLists.gl.txt | 1 +
.../spec/arb_texture_multisample/sample-position.c | 236 ++++++++++++++++++++
2 files changed, 237 insertions(+), 0 deletions(-)
create mode 100644 tests/spec/arb_texture_multisample/sample-position.c
diff --git a/tests/spec/arb_texture_multisample/CMakeLists.gl.txt b/tests/spec/arb_texture_multisample/CMakeLists.gl.txt
index 1339d62..642418f 100644
--- a/tests/spec/arb_texture_multisample/CMakeLists.gl.txt
+++ b/tests/spec/arb_texture_multisample/CMakeLists.gl.txt
@@ -18,5 +18,6 @@ piglit_add_executable (arb_texture_multisample-sample-mask sample-mask.c)
piglit_add_executable (arb_texture_multisample-sample-mask-value sample-mask-value.c)
piglit_add_executable (arb_texture_multisample-sample-mask-execution sample-mask-execution.c)
piglit_add_executable (arb_texture_multisample-negative-max-samples negative-max-samples.c)
+piglit_add_executable (arb_texture_multisample-sample-position sample-position.c)
# vim: ft=cmake:
diff --git a/tests/spec/arb_texture_multisample/sample-position.c b/tests/spec/arb_texture_multisample/sample-position.c
new file mode 100644
index 0000000..fed9f27
--- /dev/null
+++ b/tests/spec/arb_texture_multisample/sample-position.c
@@ -0,0 +1,236 @@
+/*
+ * Copyright © The Piglit Project 2013
+ *
+ * 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.
+ *
+ * Authors: Christoph Bumiller
+ */
+#include "piglit-util-gl-common.h"
+
+/* File: sample-position.c
+ *
+ * Tests whether the sample positions reported by the driver via
+ * glGetMultisamplefv correspond to the actually positions used when rendering.
+ *
+ * This test draws creates a 1x1 multisample texture and renders a triangle
+ * covering all of the render target starting at a specific x/y offset from
+ * the left/bottom to test the x/y coordinate.
+ * After each such draw, the value of all the samples is recorded into a buffer
+ * via transform feedback, and the offset is increased slightly.
+ * In the end, the buffer is mapped to check if the correct samples were
+ * covered.
+ */
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+ config.supports_gl_compat_version = 30;
+ config.window_visual = PIGLIT_GL_VISUAL_RGB;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+#define NUM_STEPS 32
+#define MAX_SAMPLES 32
+
+static GLuint tfb;
+static GLuint buf;
+static GLuint tex;
+static GLuint fbo;
+static GLuint prog;
+
+static int samples = 0;
+
+enum piglit_result
+piglit_display(void)
+{
+ float mspos[MAX_SAMPLES][2];
+ float *res;
+ const float inc = 2.0f / (float)NUM_STEPS;
+ GLint u;
+ unsigned int i, s;
+ enum piglit_result result = PIGLIT_PASS;
+
+ glUseProgram(prog);
+
+ u = glGetUniformLocation(prog, "pos");
+
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ for (i = 0; i < samples; ++i)
+ glGetMultisamplefv(GL_SAMPLE_POSITION, i, &mspos[i][0]);
+
+ glActiveTexture(GL_TEXTURE0);
+ glUniform1i(glGetUniformLocation(prog, "tex"), 0);
+
+ glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+
+ /* render triangles from x = -1 + i*increment to test coverage at x */
+ for (i = 0; i < NUM_STEPS; ++i) {
+ /* clear and draw to MS texture */
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, 0);
+ glClear(GL_COLOR_BUFFER_BIT);
+ /* set bottom left vertex (others generated via gl_VertexID) */
+ glUniform2f(u, -1.0f + inc * (float)i, -1.0f);
+ glDrawArrays(GL_TRIANGLES, 0, 3);
+
+ /* bind MS texture as texture to record samples */
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+ glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, tex);
+ glBindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0, buf,
+ MAX_SAMPLES * sizeof(float) * i,
+ MAX_SAMPLES * sizeof(float));
+ glBeginTransformFeedback(GL_POINTS);
+ glDrawArrays(GL_POINTS, 0, 1);
+ glEndTransformFeedback();
+ }
+ /* render triangles from y = -1 + i*increment to test coverage at y */
+ for (i = 0; i < NUM_STEPS; ++i) {
+ /* clear and draw to MS texture */
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, 0);
+ glClear(GL_COLOR_BUFFER_BIT);
+ /* set bottom left vertex (others generated via gl_VertexID) */
+ glUniform2f(u, -1.0f, -1.0f + inc * (float)i);
+ glDrawArrays(GL_TRIANGLES, 0, 3);
+
+ /* bind MS texture as texture to record samples */
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+ glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, tex);
+ glBindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0, buf,
+ MAX_SAMPLES * sizeof(float) * (i + NUM_STEPS),
+ MAX_SAMPLES * sizeof(float));
+ glBeginTransformFeedback(GL_POINTS);
+ glDrawArrays(GL_POINTS, 0, 1);
+ glEndTransformFeedback();
+ }
+
+ res = glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, GL_READ_ONLY);
+
+ for (i = 0; i < NUM_STEPS; ++i) {
+ float p = (float)i / (float)NUM_STEPS; /* x/y offset */
+
+ int base_x = i * MAX_SAMPLES;
+ int base_y = i * MAX_SAMPLES + NUM_STEPS * MAX_SAMPLES;
+#if 0
+ fprintf(stderr, "x >= %f:", p);
+ for (s = 0; s < samples; ++s)
+ if (res[base_x + s] == 1.0f)
+ fprintf(stderr, " %u", s);
+ fprintf(stderr, "\n");
+ fprintf(stderr, "y >= %f:", p);
+ for (s = 0; s < samples; ++s)
+ if (res[base_y + s] == 1.0f)
+ fprintf(stderr, " %u", s);
+ fprintf(stderr, "\n");
+#endif
+ /* See which samples are covered at this x/y offset and if it
+ * matches what we expect from GL_SAMPLE_POSITION.
+ */
+ for (s = 0; s < samples; ++s) {
+ if ((p > mspos[s][0] && res[base_x + s] == 1.0f) ||
+ (p <= mspos[s][0] && res[base_x + s] != 1.0f)) {
+ result = PIGLIT_FAIL;
+ fprintf(stderr, "sample %i x position (%f, %f) "
+ "incorrect !\n",s,
+ mspos[s][0], mspos[s][1]);
+ }
+ if ((p > mspos[s][1] && res[base_y + s] == 1.0f) ||
+ (p <= mspos[s][1] && res[base_y + s] != 1.0f)) {
+ result = PIGLIT_FAIL;
+ fprintf(stderr, "sample %i y position (%f, %f) "
+ "incorrect !\n",s,
+ mspos[s][0], mspos[s][1]);
+ }
+ }
+ }
+ glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER);
+
+ return result;
+}
+
+static const char *vsSource = "#version 130 \n"
+ "#extension GL_ARB_texture_multisample : require\n"
+ "uniform sampler2DMS tex; \n"
+ "uniform vec2 pos; \n"
+ "out float sample[32]; \n" /* 32 == MAX_SAMPLES */
+ "void main() { \n"
+ " int v = int(gl_VertexID); \n" /* if I can't have immediate mode ... */
+ " int i; \n"
+ " gl_Position.xy = pos + 8.0 * vec2(float(v & 1), float(v & 2)); \n"
+ " gl_Position.zw = vec2(0.0, 1.0); \n"
+ " for (i = 0; i < 32; ++i) \n"
+ " sample[i] = texelFetch(tex, ivec2(0, 0), i).g; \n"
+ "} \n";
+
+static const char *fsSource = "#version 130 \n"
+ "void main() { \n"
+ " gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0); \n"
+ "} \n";
+
+void
+piglit_init(int argc, char **argv)
+{
+ static const char *varyings[] = { "sample" };
+ GLuint vs, fs;
+ GLuint max_samples;
+
+ piglit_require_extension("GL_ARB_texture_multisample");
+ piglit_require_extension("GL_EXT_transform_feedback");
+
+ if (argc < 2) {
+ fprintf(stderr, "texelFetch <sample_count>\n");
+ exit(0);
+ }
+ samples = strtoul(argv[1], NULL, 0);
+
+ glGetIntegerv(GL_MAX_SAMPLES, (GLint *)&max_samples);
+ if (samples > max_samples)
+ piglit_report_result(PIGLIT_SKIP);
+
+ vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vsSource);
+ fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fsSource);
+ prog = piglit_link_simple_program(vs, fs);
+
+ glGenTransformFeedbacks(1, &tfb);
+ glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, tfb);
+ glTransformFeedbackVaryings(prog, 1, varyings, GL_INTERLEAVED_ATTRIBS);
+ glLinkProgram(prog);
+ glGenBuffers(1, &buf);
+ glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, buf);
+ glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER,
+ MAX_SAMPLES * sizeof(float) * NUM_STEPS * 2, NULL,
+ GL_STREAM_DRAW);
+
+ glGenTextures(1, &tex);
+ glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, tex);
+ glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, samples,
+ GL_RGBA8,
+ 1, 1, GL_TRUE);
+ glGenFramebuffers(1, &fbo);
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+ GL_TEXTURE_2D_MULTISAMPLE, tex, 0);
+
+ assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
+
+ glViewport(0, 0, 1, 1);
+
+ if (!piglit_check_gl_error(GL_NO_ERROR))
+ piglit_report_result(PIGLIT_FAIL);
+}
--
1.7.3.4
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