---
tests/all.tests | 1 +
tests/general/CMakeLists.gl.txt | 1 +
tests/general/readpix-z.c | 113 +++++++++++++++++++++++++++++++++++++++
3 files changed, 115 insertions(+), 0 deletions(-)
create mode 100644 tests/general/readpix-z.c
diff --git a/tests/all.tests b/tests/all.tests
index 9d6be77..68270f4 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -315,6 +315,7 @@ add_plain_test(general, 'provoking-vertex')
add_plain_test(general, 'oes-read-format')
add_plain_test(general, 'quad-invariance')
add_plain_test(general, 'read-front')
+add_plain_test(general, 'readpix-z')
add_plain_test(general, 'roundmode-getintegerv')
add_plain_test(general, 'roundmode-pixelstore')
add_plain_test(general, 'scissor-bitmap')
diff --git a/tests/general/CMakeLists.gl.txt b/tests/general/CMakeLists.gl.txt
index b2213c4..2318709 100644
--- a/tests/general/CMakeLists.gl.txt
+++ b/tests/general/CMakeLists.gl.txt
@@ -90,6 +90,7 @@ piglit_add_executable (primitive-restart primitive-restart.c)
piglit_add_executable (provoking-vertex provoking-vertex.c)
piglit_add_executable (oes-read-format oes-read-format.c)
piglit_add_executable (read-front read-front.c)
+piglit_add_executable (readpix-z readpix-z.c)
IF (NOT MSVC)
piglit_add_executable (roundmode-getintegerv roundmode-getintegerv.c)
ENDIF (NOT MSVC)
diff --git a/tests/general/readpix-z.c b/tests/general/readpix-z.c
new file mode 100644
index 0000000..5186768
--- /dev/null
+++ b/tests/general/readpix-z.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2012 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 glReadPixels(GL_DEPTH_COMPONENT)
+ * Brian Paul
+ * June 2012
+ */
+
+#include "piglit-util.h"
+
+int piglit_width = 200, piglit_height = 200;
+int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH;
+
+
+
+static void
+draw_z_gradient(GLfloat zLeft, GLfloat zRight)
+{
+ GLfloat verts[4][3];
+
+ verts[0][0] = -1.0; verts[0][1] = -1.0; verts[0][2] = zLeft;
+ verts[1][0] = 1.0; verts[1][1] = -1.0; verts[1][2] = zRight;
+ verts[2][0] = 1.0; verts[2][1] = 1.0; verts[2][2] = zRight;
+ verts[3][0] = -1.0; verts[3][1] = 1.0; verts[3][2] = zLeft;
+
+ glEnableClientState(GL_VERTEX_ARRAY);
+ glVertexPointer(3, GL_FLOAT, 0, verts);
+ glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+ const GLfloat epsilon = 2.0 / piglit_width;
+ GLfloat *buf;
+ bool pass = true;
+ int pos, i;
+
+ /* draw full-window quad with z increasing left to right */
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ glEnable(GL_DEPTH_TEST);
+ draw_z_gradient(-1.0, 1.0);
+
+ buf = (GLfloat *) malloc(piglit_width * sizeof(GLfloat));
+
+ glReadPixels(0, piglit_height / 2, piglit_width, 1,
+ GL_DEPTH_COMPONENT, GL_FLOAT, buf);
+
+ pos = 0;
+ if (fabs(buf[pos] - 0.0) > epsilon) {
+ printf("Left-most Z value should be close to 0.0, found %f\n",
+ buf[pos]);
+ pass = false;
+ }
+
+ pos = piglit_width / 2;
+ if (fabs(buf[pos] - 0.5) > epsilon) {
+ printf("Middle Z value should be close to 0.5, found %f\n",
+ buf[pos]);
+ pass = false;
+ }
+
+ pos = piglit_width - 1;
+ if (fabs(buf[pos] - 1.0) > epsilon) {
+ printf("Left-most Z value should be close to 1.0, found %f\n",
+ buf[pos]);
+ pass = false;
+ }
+
+ /* check for monotonicity */
+ for (i = 1; i < piglit_width; i++) {
+ if (buf[i - 1] > buf[i]) {
+ printf("Z values aren't increasing from left to right.
buf[%d]=%f > buf[%d]=%f\n",
+ i-1, buf[i-1], i, buf[i]);
+ pass = false;
+ break;
+ }
+ }
+
+ free(buf);
+
+ piglit_present_results();
+
+ return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+}
--
1.7.3.4
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