[Piglit] [PATCH 1/2] scissor-polygon: a replacement for the glean scissor test

[Brian Paul]

---
 tests/all.tests                 |    1 +
 tests/general/CMakeLists.gl.txt |    1 +
 tests/general/scissor-polygon.c |  139 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 141 insertions(+), 0 deletions(-)
 create mode 100644 tests/general/scissor-polygon.c

diff --git a/tests/all.tests b/tests/all.tests
index 479b5b4..844eff9 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -514,6 +514,7 @@ add_plain_test(gl11, 'scissor-copypixels')
 add_plain_test(gl11, 'scissor-depth-clear')
 add_plain_test(gl11, 'scissor-many')
 add_plain_test(gl11, 'scissor-offscreen')
+add_concurrent_test(gl11, 'scissor-polygon')
 add_plain_test(gl11, 'scissor-stencil-clear')
 gl11['GL_SELECT - no test function'] = PlainExecTest(['select', 'gl11'])
 gl11['GL_SELECT - depth-test enabled'] = PlainExecTest(['select', 'depth'])
diff --git a/tests/general/CMakeLists.gl.txt b/tests/general/CMakeLists.gl.txt
index 9c7ac1b..d356525 100644
--- a/tests/general/CMakeLists.gl.txt
+++ b/tests/general/CMakeLists.gl.txt
@@ -108,6 +108,7 @@ piglit_add_executable (scissor-copypixels scissor-copypixels.c)
 piglit_add_executable (scissor-depth-clear scissor-depth-clear.c)
 piglit_add_executable (scissor-many scissor-many.c)
 piglit_add_executable (scissor-offscreen scissor-offscreen.c)
+piglit_add_executable (scissor-polygon scissor-polygon.c)
 piglit_add_executable (scissor-stencil-clear scissor-stencil-clear.c)
 piglit_add_executable (select select.c)
 piglit_add_executable (stencil-drawpixels stencil-drawpixels.c)
diff --git a/tests/general/scissor-polygon.c b/tests/general/scissor-polygon.c
new file mode 100644
index 0000000..3f60072
--- /dev/null
+++ b/tests/general/scissor-polygon.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright © 2013 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 OpenGL scissor for polygon rendering.
+ * This is a replacement for the old glean scissor test.
+ *
+ * Brian Paul
+ * Feb 2013
+ */
+
+#include "piglit-util-gl-common.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+	config.supports_gl_compat_version = 10;
+	config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_ALPHA;
+PIGLIT_GL_TEST_CONFIG_END
+
+
+static const GLubyte black[4] = { 0, 0, 0, 0 };
+static const GLubyte white[4] = { 255, 255, 255, 255 };
+
+
+static bool
+color_equal(const GLubyte c1[4], const GLubyte c2[4])
+{
+	return (c1[0] == c2[0] &&
+		c1[1] == c2[1] &&
+		c1[2] == c2[2] &&
+		c1[3] == c2[3]);
+}
+
+
+static bool
+check_result(int x, int y, int w, int h, const GLubyte *image)
+{
+	int i, j;
+
+	for (j = 0; j < piglit_height; j++) {
+		for (i = 0; i < piglit_width; i++) {
+			const GLubyte *p = image + (j * piglit_width + i) * 4;
+			if (i >= x && i < x + w &&
+			    j >= y && j < y + h) {
+				/* inside the scissor rect */
+				if (!color_equal(p, white)) {
+					fprintf(stderr, "Expected white at (%d, %d),"
+						" found black\n", i, j);
+					return false;
+				}
+			}
+			else {
+				/* outside the scissor rect */
+				if (!color_equal(p, black)) {
+					fprintf(stderr, "Expected black at (%d, %d),"
+						" found white\n", i, j);
+					return false;
+				}
+			}
+		}
+	}
+
+	return true;
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+	GLubyte *image = malloc(piglit_width * piglit_height * 4);
+	int dx, dy;
+	int x, y, w, h;
+	bool pass = true;
+
+	/* compute position step */
+	dx = piglit_width / 8;
+	dy = piglit_height / 8;
+
+	/* compute scissor size */
+	w = piglit_width / 5;
+	h = piglit_height / 5;
+
+	glColor4ubv(white);
+
+	/* loop over scissor positions */
+	for (y = 0; y < piglit_height; y += dy) {
+		for (x = 0; x < piglit_width; x += dx) {
+			glClear(GL_COLOR_BUFFER_BIT);
+
+			glEnable(GL_SCISSOR_TEST);
+			glScissor(x, y, w, h);
+
+			/* draw window-sized quad */
+			piglit_draw_rect(-1, -1, 2, 2);
+
+			glDisable(GL_SCISSOR_TEST);
+
+			glReadPixels(0, 0, piglit_width, piglit_height,
+				     GL_RGBA, GL_UNSIGNED_BYTE, image);
+
+			piglit_present_results();
+
+			pass = check_result(x, y, w, h, image);
+			if (!pass)
+				goto end;
+		}
+	}
+
+end:
+	free(image);
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+void
+piglit_init(int argc, char**argv)
+{
+	/* nothing */
+}
-- 
1.7.3.4