generatemipmap-base-change: new test to exercise a Mesa glGenerateMipmap() issue

SuperTuxKart 0.9 creates a GL_RGBA texture and calls glGenerateMipmap().
Later, it changes the base level to be GL_SRGB_ALPHA and calls
glGenerateMipmap() again.  This causes a device error with the VMware
driver because the texture mipmap levels wind up with different formats.

This piglit test reproduces that, but changes the base level format from
GL_RGBA to GL_ALPHA.  Same device error with VMware, but also triggers an
assertion in llvmpipe/softpipe.  Probably causes other issues with other
gallium drivers.

The test can also exercise changing the base texture level size (via
command line argument) instead of the format.

A Mesa patch series will fix the issue.

Signed-off-by: Brian Paul <brianp@vmware.com>

1 files changed, 129 insertions, 0 deletions

diff --git a/tests/texturing/generatemipmap-base-change.c b/tests/texturing/generatemipmap-base-change.c
new file mode 100644
index 000000000..3ea569893
--- /dev/null
+++ b/tests/texturing/generatemipmap-base-change.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2016 VMware, Inc.
+ *
+ * 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.
+ */
+
+/**
+ * Test that glGenerateMipmap works properly (doesn't crash) when called a
+ * second time on a texture after we change the base image's size or format.
+ *
+ * The command line takes two parameters:
+ *   size   - test base level size change
+ *   format - test base level format change
+ */
+
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+	config.supports_gl_compat_version = 10;
+	config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
+PIGLIT_GL_TEST_CONFIG_END
+
+
+void
+piglit_init(int argc, char **argv)
+{
+#define MAX_SIZE 8
+	GLubyte img[MAX_SIZE * MAX_SIZE * 4];
+	bool change_size = true, change_format = false;
+	int i;
+	GLuint tex;
+	GLsizei base_size, w0 = 0, h0 = 0;
+	bool pass = true;
+
+	/* We require GL 3.0 or GL_EXT_framebuffer_object */
+	if (piglit_get_gl_version() < 30 &&
+		!piglit_is_extension_supported("GL_EXT_framebuffer_object")) {
+		piglit_report_result(PIGLIT_SKIP);
+	}
+
+	/* parse args */
+	for (i = 1; i < argc; i++) {
+		if (strcmp(argv[i], "size") == 0) {
+			change_size = true;
+		} else if (strcmp(argv[i], "format") == 0) {
+			change_format = true;
+		}
+	}
+	assert(change_size || change_format);
+
+	/* init image data */
+	for (i = 0; i < sizeof(img); i++)
+		img[i] = 128;
+
+
+	glGenTextures(1, &tex);
+	glBindTexture(GL_TEXTURE_2D, tex);
+
+	// Create initial texture mipmap (base_size x base_size)
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	base_size = change_size ? MAX_SIZE / 2 : MAX_SIZE;
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, base_size, base_size, 0,
+		     GL_RGBA, GL_UNSIGNED_BYTE, img);
+	glGenerateMipmap(GL_TEXTURE_2D);
+
+	if (change_format) {
+		/* Change format of first level */
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, base_size, base_size,
+			     0, GL_RGBA, GL_UNSIGNED_BYTE, img);
+	}
+	else if (change_size) {
+		/* Change base level to be larger */
+		assert(base_size * 2 == MAX_SIZE);
+		base_size = MAX_SIZE;
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, base_size, base_size,
+			     0, GL_RGBA, GL_UNSIGNED_BYTE, img);
+	}
+
+	/* See if mipmap generation works (may crash/assert in Mesa) */
+	glGenerateMipmap(GL_TEXTURE_2D);
+
+	/* check level sizes */
+	for (i = 0; i < 3; i++) {
+		GLint w, h;
+		glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w);
+		glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h);
+		if (i == 0) {
+			w0 = w;
+			h0 = h;
+		}
+		else {
+			if (w != w0 >> i || h != h0 >> i) {
+				printf("Incorrect mipmap level size: level %d", i);
+				printf(" Found %d x %d, expected %d x %d\n", w, h,
+				       w0 >> i , h0 >> i);
+				pass = false;
+			}
+		}
+	}
+
+	piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+	// no-op
+	return PIGLIT_PASS;
+}