[Piglit] [PATCH] fbo-viewport: exercise glViewport with FBOs
Brian Paul
brianp at vmware.com
Mon May 14 15:43:06 PDT 2012
In particular, make sure viewports that extend beyond the surface bounds
are handled correctly. Also, if the FBO surface is stored inverted, this
should detect flipped viewport bugs too.
---
tests/all.tests | 1 +
tests/fbo/CMakeLists.gl.txt | 1 +
tests/fbo/fbo-viewport.c | 194 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 196 insertions(+), 0 deletions(-)
create mode 100644 tests/fbo/fbo-viewport.c
diff --git a/tests/all.tests b/tests/all.tests
index da50ee0..1565e6b 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -230,6 +230,7 @@ add_plain_test(fbo, 'fbo-storage-formats')
add_plain_test(fbo, 'fbo-storage-completeness')
add_plain_test(fbo, 'fbo-sys-blit')
add_plain_test(fbo, 'fbo-sys-sub-blit')
+add_plain_test(fbo, 'fbo-viewport')
add_fbo_rg(fbo, 'GL_RED')
add_fbo_rg(fbo, 'GL_R8')
add_fbo_rg(fbo, 'GL_R16')
diff --git a/tests/fbo/CMakeLists.gl.txt b/tests/fbo/CMakeLists.gl.txt
index 579e623..34ac405 100644
--- a/tests/fbo/CMakeLists.gl.txt
+++ b/tests/fbo/CMakeLists.gl.txt
@@ -86,5 +86,6 @@ piglit_add_executable (fbo-copyteximage fbo-copyteximage.c)
piglit_add_executable (fbo-copyteximage-simple fbo-copyteximage-simple.c)
piglit_add_executable (fbo-cubemap fbo-cubemap.c)
piglit_add_executable (fbo-scissor-bitmap fbo-scissor-bitmap.c)
+piglit_add_executable (fbo-viewport fbo-viewport.c)
# vim: ft=cmake:
diff --git a/tests/fbo/fbo-viewport.c b/tests/fbo/fbo-viewport.c
new file mode 100644
index 0000000..c665ad6
--- /dev/null
+++ b/tests/fbo/fbo-viewport.c
@@ -0,0 +1,194 @@
+/*
+ * Copyright (c) 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 glViewport w/ FBOs.
+ * In Mesa, on-screen windows and user-created FBOs are stored differently
+ * (inverted). Make sure viewports are handled properly.
+ * Draw a test pattern (with many viewports) into the window, then draw the
+ * same thing into an FBO. Compare the images. They should be the same.
+ */
+
+#include "piglit-util.h"
+#include "piglit-framework.h"
+
+int piglit_width = 500;
+int piglit_height = 500;
+int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
+
+
+/**
+ * Draw some simple quads in a bunch of viewports which tile the window.
+ * Note that viewports extend beyond the edges of the window too.
+ */
+static void
+draw_test_image(void)
+{
+ int vx, vy, vw = 200, vh = 200;
+
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum(-1, 1, -1, 1, 3, 9.5);
+
+ /* Draw some quads at an odd rotation.
+ * Note that we want near/far frustum clipping.
+ */
+ glMatrixMode(GL_MODELVIEW);
+ glPushMatrix();
+ glTranslatef(0, 1, -6.20);
+ glRotatef(-60, 1, 0, 0);
+ glRotatef(30, 0, 0, 1);
+ glScalef(3.5, 3.5, 3.5);
+
+ /* loop over viewports */
+ for (vy = -50; vy < piglit_height; vy += vh+10) {
+ for (vx = -30; vx < piglit_width; vx += vw+10) {
+ glViewport(vx, vy, vw, vh);
+
+ glBegin(GL_QUADS);
+
+ glColor3f(1, 0, 0);
+ glVertex2f(-1, -1);
+ glVertex2f( 0, -1);
+ glVertex2f( 0, 0);
+ glVertex2f(-1, 0);
+
+ glColor3f(0, 1, 0);
+ glVertex2f( 0, -1);
+ glVertex2f( 1, -1);
+ glVertex2f( 1, 0);
+ glVertex2f( 0, 0);
+
+ glColor3f(0, 0, 1);
+ glVertex2f(-1, 0);
+ glVertex2f( 0, 0);
+ glVertex2f( 0, 1);
+ glVertex2f(-1, 1);
+
+ glColor3f(1, 1, 1);
+ glVertex2f( 0, 0);
+ glVertex2f( 1, 0);
+ glVertex2f( 1, 1);
+ glVertex2f( 0, 1);
+
+ glEnd();
+ }
+ }
+
+ glPopMatrix();
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+ GLubyte *win_image, *fbo_image;
+ GLuint fbo, rb;
+ bool pass = true;
+
+ win_image = (GLubyte *) malloc(piglit_width * piglit_height * 3);
+ fbo_image = (GLubyte *) malloc(piglit_width * piglit_height * 3);
+
+ glPixelStorei(GL_PACK_ALIGNMENT, 1);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+ glGenFramebuffers(1, &fbo);
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ glGenRenderbuffers(1, &rb);
+ glBindRenderbuffer(GL_RENDERBUFFER, rb);
+ glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA,
+ piglit_width, piglit_height);
+ glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+ GL_RENDERBUFFER, rb);
+
+ assert(glGetError() == 0);
+
+ assert(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) ==
+ GL_FRAMEBUFFER_COMPLETE_EXT);
+
+ /* draw reference image in the window */
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+ draw_test_image();
+ glReadPixels(0, 0, piglit_width, piglit_height,
+ GL_RGB, GL_UNSIGNED_BYTE, win_image);
+
+ /* draw test image in fbo */
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ glReadBuffer(GL_COLOR_ATTACHMENT0);
+ draw_test_image();
+ glReadPixels(0, 0, piglit_width, piglit_height,
+ GL_RGB, GL_UNSIGNED_BYTE, fbo_image);
+
+ /* compare images */
+ if (memcmp(win_image, fbo_image, piglit_width * piglit_height * 3)) {
+#if 0 /* helpful debug code */
+ int i, k;
+ for (i = k = 0; i < piglit_width * piglit_height * 3; i++) {
+ if (win_image[i] != fbo_image[i] && k++ < 40)
+ printf("%d: %d vs. %d\n",
+ i, win_image[i], fbo_image[i]);
+ }
+#endif
+ printf("Image comparison failed!\n");
+ pass = false;
+ }
+ else if (!piglit_automatic) {
+ printf("Image comparison passed.\n");
+ }
+
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+#if 0 /* for debug/compare (alternate diplaying Window vs. FBO image) */
+ {
+ int i;
+ glWindowPos2i(0,0);
+ for (i = 0; i < 10; i++) {
+ GLubyte *image = (i & 1) ? fbo_image : win_image;
+ printf("Showing %s image\n", (i & 1) ? "FBO" : "window");
+ glDrawPixels(piglit_width, piglit_height,
+ GL_RGB, GL_UNSIGNED_BYTE, image);
+ glutSwapBuffers();
+ sleep(1);
+ }
+ }
+#endif
+
+ piglit_present_results();
+
+ glDeleteRenderbuffers(1, &rb);
+ glDeleteFramebuffers(1, &fbo);
+ free(win_image);
+ free(fbo_image);
+
+ return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+ piglit_require_extension("GL_ARB_framebuffer_object");
+ glClearColor(0.2, 0.2, 0.2, 0.0);
+}
--
1.7.3.4
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