general/depth-clear-with-copy: New test.HEADmain

This is a regression test for 79ab787a8f6bf2ea0b8a6c8d1ea057d62c77e8e1.

Part-of: <https://gitlab.freedesktop.org/mesa/piglit/-/merge_requests/781>

3 files changed, 107 insertions, 0 deletions

diff --git a/tests/general/CMakeLists.gl.txt b/tests/general/CMakeLists.gl.txt
index 4f5aab867..23ea39e9c 100644
--- a/tests/general/CMakeLists.gl.txt
+++ b/tests/general/CMakeLists.gl.txt
@@ -35,6 +35,7 @@ piglit_add_executable (dlist-fdo3129-02 dlist-fdo3129-02.c)
 piglit_add_executable (dlist-fdo31590 dlist-fdo31590.c)
 piglit_add_executable (depth_clamp depth_clamp.c)
 piglit_add_executable (depth-clear-precision-check depth-clear-precision-check.c)
+piglit_add_executable (depth-clear-with-copy depth-clear-with-copy.c)
 piglit_add_executable (depthfunc depthfunc.c)
 piglit_add_executable (depthrange-clear depthrange-clear.c)
 piglit_add_executable (draw-arrays-colormaterial draw-arrays-colormaterial.c)
diff --git a/tests/general/depth-clear-with-copy.c b/tests/general/depth-clear-with-copy.c
new file mode 100644
index 000000000..db6cbeafa
--- /dev/null
+++ b/tests/general/depth-clear-with-copy.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright © 2023 Zeb Figura
+ *
+ * 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 depth-copy.c
+ *
+ * A regression test for a broken code path in radeonsi related to
+ * fast depth clears.
+ */
+
+#include "piglit-util-gl.h"
+#include <stdlib.h>
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_compat_version = 11;
+	config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE |
+			       PIGLIT_GL_VISUAL_DEPTH;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+void piglit_init(int argc, char **argv)
+{
+	piglit_require_extension("GL_ARB_copy_image");
+	piglit_require_extension("GL_ARB_framebuffer_object");
+	glDepthFunc(GL_ALWAYS);
+	glEnable(GL_DEPTH_TEST);
+	glDepthMask(GL_TRUE);
+}
+
+enum piglit_result piglit_display(void)
+{
+	GLuint fb, depth[2];
+	bool pass = true;
+	GLfloat *pixels;
+	unsigned int i;
+
+	glGenTextures(2, depth);
+	glBindTexture(GL_TEXTURE_2D, depth[0]);
+	glTexStorage2D(GL_TEXTURE_2D, 1, GL_DEPTH_COMPONENT24, piglit_width, piglit_height);
+	glBindTexture(GL_TEXTURE_2D, depth[1]);
+	glTexStorage2D(GL_TEXTURE_2D, 1, GL_DEPTH_COMPONENT24, piglit_width, piglit_height);
+
+	/* Clear the first texture to 0. */
+	glGenFramebuffers(1, &fb);
+	glBindFramebuffer(GL_FRAMEBUFFER, fb);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth[0], 0);
+	assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
+	glClearDepth(0.0);
+	glClear(GL_DEPTH_BUFFER_BIT);
+
+	/* Copy to the second texture. */
+	glCopyImageSubData(depth[0], GL_TEXTURE_2D, 0, 0, 0, 0, depth[1], GL_TEXTURE_2D, 0, 0, 0, 0, piglit_width, piglit_height, 1);
+
+	/* Clear the first texture to 1. */
+	glClearDepth(1.0);
+	glClear(GL_DEPTH_BUFFER_BIT);
+
+	/* Draw to the first texture. */
+
+	glBegin(GL_TRIANGLE_STRIP);
+	glVertex3f(-0.6f, -0.7f, 0.5f);
+	glVertex3f( 0.8f,  0.5f, 0.5f);
+	glVertex3f( 0.7f, -0.7f, 0.5f);
+	glEnd();
+
+	pixels = malloc(piglit_width * piglit_height * sizeof(*pixels));
+	glReadPixels(0, 0, piglit_width, piglit_height, GL_DEPTH_COMPONENT, GL_FLOAT, pixels);
+	for (i = 0; i < piglit_width * piglit_height; ++i) {
+		GLfloat probe = pixels[i];
+		/* Every pixel should either be 0.75f (tri depth) or 1.0f (clear depth). */
+		if (fabsf(probe - 0.75f) >= 0.01 && fabsf(probe - 1.0f) >= 0.01) {
+			printf("Got depth %.8e at (%u, %u).\n", probe, i % piglit_width, i / piglit_width);
+			pass = false;
+			break;
+		}
+	}
+	free(pixels);
+
+	piglit_present_results();
+
+	glDeleteFramebuffers(1, &fb);
+	glDeleteTextures(2, depth);
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
diff --git a/tests/opengl.py b/tests/opengl.py
index b8d6d65e5..a80f0826d 100644
--- a/tests/opengl.py
+++ b/tests/opengl.py
@@ -612,6 +612,7 @@ with profile.test_list.group_manager(
     g(['gl-1.0-user-clip-all-planes'])
     g(['rasterpos'])
     g(['depth-clear-precision-check'])
+    g(['depth-clear-with-copy'])
 
 with profile.test_list.group_manager(
         PiglitGLTest,