[Piglit] [PATCH] gl-2.1: Add a test for alpha testing with multiple render targets
Anuj Phogat
anuj.phogat at gmail.com
Wed Oct 26 23:01:45 UTC 2016
In a situation when there are multiple render targets with alpha testing
enabled, if fragment shader doesn't write to draw buffer zero, alpha
value used for alpha testing will be undefined. Such case should not
cause a GPU hang.
Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
---
tests/all.py | 1 +
tests/spec/gl-2.1/CMakeLists.gl.txt | 1 +
.../fbo-mrt-alphatest-no-buffer-zero-write.c | 152 +++++++++++++++++++++
3 files changed, 154 insertions(+)
create mode 100644 tests/spec/gl-2.1/fbo-mrt-alphatest-no-buffer-zero-write.c
diff --git a/tests/all.py b/tests/all.py
index 9b67bae..e56cae8 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -1155,6 +1155,7 @@ with profile.group_manager(
g(['gl-2.1-minmax'], 'minmax')
g(['gl-2.1-pbo'], 'pbo')
g(['gl-2.1-polygon-stipple-fs'], 'polygon-stipple-fs')
+ g(['gl-2.1-fbo-mrt-alphatest-no-buffer-zero-write'], 'fbo-mrt-alphatest-no-buffer-zero-write')
with profile.group_manager(
PiglitGLTest,
diff --git a/tests/spec/gl-2.1/CMakeLists.gl.txt b/tests/spec/gl-2.1/CMakeLists.gl.txt
index dbd1e7a..1ce1443 100644
--- a/tests/spec/gl-2.1/CMakeLists.gl.txt
+++ b/tests/spec/gl-2.1/CMakeLists.gl.txt
@@ -12,3 +12,4 @@ link_libraries (
piglit_add_executable (gl-2.1-minmax minmax.c)
piglit_add_executable (gl-2.1-pbo pbo.c)
piglit_add_executable (gl-2.1-polygon-stipple-fs polygon-stipple-fs.c)
+piglit_add_executable (gl-2.1-fbo-mrt-alphatest-no-buffer-zero-write fbo-mrt-alphatest-no-buffer-zero-write.c)
diff --git a/tests/spec/gl-2.1/fbo-mrt-alphatest-no-buffer-zero-write.c b/tests/spec/gl-2.1/fbo-mrt-alphatest-no-buffer-zero-write.c
new file mode 100644
index 0000000..51e694b
--- /dev/null
+++ b/tests/spec/gl-2.1/fbo-mrt-alphatest-no-buffer-zero-write.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright © 2016 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.
+ */
+
+/*
+ * This test asserts correct behavior for alpha-testing of fragments when
+ * multiple color buffers are being rendered to. In particular, the alpha
+ * component of the color output to draw buffer zero is used for the alpha
+ * test. If draw buffer zero is not written by the fragment shader, alpha
+ * value used for alpha testing is undefined.
+ * From OpenGL 2.1 specification:
+ * "If a fragment shader writes to neither gl FragColor nor gl FragData,
+ * the values of the fragment colors following shader execution are
+ * undefined, and may differ for each fragment color."
+ *
+ * Test should run to completion without a GPU hang.
+ *
+ * This is important for deferred renderers which use alpha-test, and is a
+ * significant edge case for the i965 driver.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+ config.supports_gl_compat_version = 21;
+
+ config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+GLenum buffers[] = {GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2};
+GLuint fbo;
+GLint prog;
+GLuint color0, color1, color2;
+
+void
+piglit_init(int argc, char **argv)
+{
+ piglit_require_GLSL_version(130);
+
+ glGenFramebuffers(1, &fbo);
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+
+ glGenTextures(1, &color0);
+ glBindTexture(GL_TEXTURE_2D, color0);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, color0, 0);
+
+ glGenTextures(1, &color1);
+ glBindTexture(GL_TEXTURE_2D, color1);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, color1, 0);
+
+ glGenTextures(1, &color2);
+ glBindTexture(GL_TEXTURE_2D, color2);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2, GL_TEXTURE_2D, color2, 0);
+
+ glDrawBuffers(3, buffers);
+
+ prog = piglit_build_simple_program(
+ "#version 130\n"
+ "in vec4 pos;\n"
+ "void main() {\n"
+ " gl_Position = pos;\n"
+ "}\n",
+
+ "#version 130\n"
+ "void main() {\n"
+ " float alpha = float(int(gl_FragCoord.x / 16 + gl_FragCoord.y / 16) % 2);\n"
+ " /*Don't write color to draw buffer zero i.e. gl_FragData[0] */\n"
+ " gl_FragData[1] = vec4(1.0, 0.0, 0.0, alpha);\n"
+ " gl_FragData[2] = vec4(0.0, 1.0, 0.0, 1.0);\n"
+ "}\n"
+ );
+
+ if (!piglit_check_gl_error(GL_NO_ERROR)) {
+ printf("Setup for test failed.\n");
+ piglit_report_result(PIGLIT_SKIP);
+ }
+
+ if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+ printf("Framebuffer not complete.\n");
+ piglit_report_result(PIGLIT_SKIP);
+ }
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ glClearColor(0,0,1,0);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glAlphaFunc(GL_GEQUAL, 0.5f);
+ glEnable(GL_ALPHA_TEST);
+
+ glUseProgram(prog);
+ glViewport(0, 0, 64, 64);
+ piglit_draw_rect(-1, -1, 2, 2);
+
+ glDisable(GL_ALPHA_TEST);
+
+ /* Visualize it */
+ glUseProgram(0);
+ glBindFramebuffer(GL_FRAMEBUFFER, piglit_winsys_fbo);
+ glViewport(0, 0, 128, 64);
+ glClearColor(0,0,0.5,0);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, color1);
+ piglit_draw_rect_tex(-1, -1, 1, 2,
+ 0, 0, 1, 1);
+ glBindTexture(GL_TEXTURE_2D, color2);
+ piglit_draw_rect_tex(0, -1, 1, 2,
+ 0, 0, 1, 1);
+ glDisable(GL_TEXTURE_2D);
+ piglit_present_results();
+
+ /* The fragment colors are undefined in this test. So, we can't probe the
+ * pixels. If test executes to completion, return PIGLIT_PASS.
+ */
+ return PIGLIT_PASS;
+}
--
2.5.5
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