fbo-alpha: Test for supporting GL_ALPHA FBOs with ARB_fbo.

3 files changed, 151 insertions, 0 deletions

diff --git a/tests/all.tests b/tests/all.tests
index 5a1204494..338eb747f 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -67,6 +67,7 @@ add_plain_test(mesa, 'crossbar')
 fbo = Group()
 add_plain_test(fbo, 'fbo-1d')
 add_plain_test(fbo, 'fbo-3d')
+add_plain_test(fbo, 'fbo-alpha')
 add_plain_test(fbo, 'fbo-blit')
 add_plain_test(fbo, 'fbo-cubemap')
 add_plain_test(fbo, 'fbo-clearmipmap')
diff --git a/tests/fbo/CMakeLists.txt b/tests/fbo/CMakeLists.txt
index 24640a673..6a70ee152 100644
--- a/tests/fbo/CMakeLists.txt
+++ b/tests/fbo/CMakeLists.txt
@@ -23,6 +23,7 @@ link_libraries (
 
 add_executable (fbo-1d fbo-1d.c)
 add_executable (fbo-3d fbo-3d.c)
+add_executable (fbo-alpha fbo-alpha.c)
 add_executable (fbo-blit fbo-blit.c)
 add_executable (fbo-copypix fbo-copypix.c)
 add_executable (fbo-readdrawpix fbo-readdrawpix.c)
diff --git a/tests/fbo/fbo-alpha.c b/tests/fbo/fbo-alpha.c
new file mode 100644
index 000000000..479dabea4
--- /dev/null
+++ b/tests/fbo/fbo-alpha.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * 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.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+/** @file fbo-alpha.c
+ *
+ * Tests that rendering to and blending on a GL_ALPHA FBO works with
+ * GL_ARB_framebuffer_object.
+ */
+
+#include "piglit-util.h"
+
+int piglit_width = 128;
+int piglit_height = 128;
+int piglit_window_mode = GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE;
+
+enum piglit_result
+piglit_display(void)
+{
+	GLboolean pass = GL_TRUE;
+	GLuint tex, fb;
+	GLenum status;
+	float fbo_white[] = {0.0, 0.0, 0.0, 1.0};
+	float fbo_black[] = {0.0, 0.0, 0.0, 0.0};
+	float fbo_gray[] =  {0.0, 0.0, 0.0, 0.5};
+	float white[] = {1.0, 1.0, 1.0, 1.0};
+	float black[] = {0.0, 0.0, 0.0, 0.0};
+	float gray[] =  {0.5, 0.5, 0.5, 0.5};
+	int fbo_width = 64;
+	int fbo_height = 64;
+
+	glGenFramebuffersEXT(1, &fb);
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
+	glViewport(0, 0, fbo_width, fbo_height);
+
+	glGenTextures(1, &tex);
+	glBindTexture(GL_TEXTURE_2D, tex);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA,
+		     fbo_width, fbo_height, 0,
+		     GL_ALPHA, GL_UNSIGNED_BYTE, NULL);
+
+	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
+				  GL_COLOR_ATTACHMENT0_EXT,
+				  GL_TEXTURE_2D,
+				  tex,
+				  0);
+	assert(glGetError() == 0);
+
+	status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+	if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+		fprintf(stderr, "fbo incomplete (status = 0x%04x)\n", status);
+		piglit_report_result(PIGLIT_SKIP);
+	}
+
+	/* Clear to no alpha. */
+	glClearColor(0.0, 0.0, 0.0, 0.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glColor4f(0.0, 0.0, 0.0, 0.0);
+	piglit_draw_rect(-1.0, -1.0, 0.5, 2.0);
+
+	glColor4f(0.0, 0.0, 0.0, 1.0);
+	piglit_draw_rect(-0.5, -1.0, 0.5, 2.0);
+
+	glColor4f(0.0, 0.0, 0.0, 0.5);
+	piglit_draw_rect(0.0, -1.0, 0.5, 2.0);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_DST_ALPHA, GL_ZERO);
+	glColor4f(0.0, 0.0, 0.0, 1.0);
+	piglit_draw_rect(0.0, -1.0, 0.5, 2.0);
+	glDisable(GL_BLEND);
+
+	glColor4f(0.0, 0.0, 0.0, 0.5);
+	piglit_draw_rect(0.5, -1.0, 0.5, 2.0);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_ZERO, GL_SRC_ALPHA);
+	glColor4f(0.0, 0.0, 0.0, 1.0);
+	piglit_draw_rect(0.5, -1.0, 0.5, 2.0);
+	glDisable(GL_BLEND);
+
+	printf("Testing FBO result.\n");
+	pass = piglit_probe_pixel_rgba(fbo_width * 1 / 8, 0, fbo_black) && pass;
+	pass = piglit_probe_pixel_rgba(fbo_width * 3 / 8, 0, fbo_white) && pass;
+	pass = piglit_probe_pixel_rgba(fbo_width * 5 / 8, 0, fbo_gray) && pass;
+	pass = piglit_probe_pixel_rgba(fbo_width * 7 / 8, 0, fbo_gray) && pass;
+
+	/* Draw the two textures to halves of the window. */
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+	glViewport(0, 0, piglit_width, piglit_height);
+
+	glEnable(GL_TEXTURE_2D);
+	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
+	glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_REPLACE);
+	glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
+	glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_ALPHA);
+	glTexEnvi (GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_TEXTURE);
+	glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
+	glTexEnvi (GL_TEXTURE_ENV, GL_SOURCE0_ALPHA, GL_TEXTURE);
+
+	glBindTexture(GL_TEXTURE_2D, tex);
+	piglit_draw_rect_tex(-1, -1, 2, 2,
+			     0, 0, 1, 1);
+
+	glDisable(GL_TEXTURE_2D);
+	glDeleteTextures(1, &tex);
+	glDeleteFramebuffersEXT(1, &fb);
+
+	printf("Testing window result.\n");
+	pass = piglit_probe_pixel_rgba(piglit_width * 1 / 8, 0, black) && pass;
+	pass = piglit_probe_pixel_rgba(piglit_width * 3 / 8, 0, white) && pass;
+	pass = piglit_probe_pixel_rgba(piglit_width * 5 / 8, 0, gray) && pass;
+	pass = piglit_probe_pixel_rgba(piglit_width * 7 / 8, 0, gray) && pass;
+
+	glutSwapBuffers();
+
+	return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	piglit_require_extension("GL_ARB_framebuffer_object");
+	piglit_require_extension("GL_ARB_texture_env_combine");
+}