[Piglit] [PATCH] vbo-too-small: test drawing from a VBO that's too small

[Brian Paul]

This exercises a failed assertion hit with softpipe and llvmpipe.
---
 tests/all.tests                 |    1 +
 tests/general/CMakeLists.gl.txt |    1 +
 tests/general/vbo-too-small.c   |  103 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 105 insertions(+), 0 deletions(-)
 create mode 100644 tests/general/vbo-too-small.c

diff --git a/tests/all.tests b/tests/all.tests
index 6bcd3d9..a22c409 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -308,6 +308,7 @@ add_plain_test(general, 'vbo-bufferdata')
 add_plain_test(general, 'vbo-map-remap')
 add_plain_test(general, 'vbo-subdata-sync')
 add_plain_test(general, 'vbo-subdata-zero')
+add_plain_test(general, 'vbo-too-small')
 add_plain_test(general, 'windowoverlap')
 add_fbo_depthstencil_tests(general, 'default_fb')
 
diff --git a/tests/general/CMakeLists.gl.txt b/tests/general/CMakeLists.gl.txt
index 8ff3771..5985eae 100644
--- a/tests/general/CMakeLists.gl.txt
+++ b/tests/general/CMakeLists.gl.txt
@@ -113,6 +113,7 @@ add_executable (vbo-map-remap vbo-map-remap.c)
 add_executable (vbo-bufferdata vbo-bufferdata.c)
 add_executable (vbo-subdata-zero vbo-subdata-zero.c)
 add_executable (vbo-subdata-sync vbo-subdata-sync.c)
+add_executable (vbo-too-small vbo-too-small.c)
 add_executable (windowoverlap windowoverlap.c)
 add_executable (object_purgeable-api-pbo object_purgeable-api-pbo.c object_purgeable.c)
 add_executable (object_purgeable-api-texture object_purgeable-api-texture.c object_purgeable.c)
diff --git a/tests/general/vbo-too-small.c b/tests/general/vbo-too-small.c
new file mode 100644
index 0000000..da302e0
--- /dev/null
+++ b/tests/general/vbo-too-small.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright © 2011 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 drawing with too small of VBO.  We shouldn't crash.
+ *
+ * Brian Paul
+ * 11/11/11
+ */
+
+
+#include "piglit-util.h"
+
+int piglit_width = 100, piglit_height = 100;
+int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
+
+
+static const GLfloat verts[4][2] = {
+   { 0, 0 },
+   { 1, 0 },
+   { 1, 1 },
+   { 0, 1 }
+};
+
+
+enum piglit_result
+piglit_display(void)
+{
+   static const GLfloat black[3] = { 0, 0, 0 };
+   GLuint vbo;
+   GLboolean pass = GL_TRUE;
+   int size;
+
+   glColor3f(1, 1, 1);
+
+   glGenBuffersARB(1, &vbo);
+   glBindBufferARB(GL_ARRAY_BUFFER_ARB, vbo);
+
+   glEnableClientState(GL_VERTEX_ARRAY);
+
+   /* try drawing from VBOs all of which are too small */
+   for (size = 0; size < sizeof(verts); size++) {
+
+      glClear(GL_COLOR_BUFFER_BIT);
+
+      glBufferDataARB(GL_ARRAY_BUFFER_ARB, size, verts, GL_STATIC_DRAW_ARB);
+
+      glVertexPointer(2, GL_FLOAT, 0, NULL);
+
+      glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+      /* Probe the upper-left corner where the second triangle of the fan
+       * would be drawn if the VBO was large enough.  It should never be drawn.
+       */
+      if (!piglit_probe_pixel_rgb(piglit_width / 4,
+                                  piglit_height * 3 /4,
+                                  black)) {
+         /* something was drawn */
+         printf("vbo-too-small: failed for buffer size %d\n", size);
+         pass = GL_FALSE;
+      }
+
+      glutSwapBuffers();
+   }
+
+   glDisableClientState(GL_VERTEX_ARRAY);
+   glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
+   glVertexPointer(2, GL_FLOAT, 0, NULL);
+
+   glDeleteBuffersARB(1, &vbo);
+
+   return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+   piglit_require_extension("GL_ARB_vertex_buffer_object");
+
+   piglit_gen_ortho_projection(0.0, 1.0, 0.0, 1.0,
+                               -1.0, 1.0, GL_FALSE);
+}
-- 
1.7.3.4