fbo-1d: New test for rendering to 1D textures.

I wrote this to test a report about failing to render to 1D textures on 965.
Turns out the original testcase was expecting rasterization accuracy
that GL_LINEs don't guarantee.

1 files changed, 205 insertions, 0 deletions

diff --git a/tests/fbo/fbo-1d.c b/tests/fbo/fbo-1d.c
new file mode 100644
index 000000000..ce28c8355
--- /dev/null
+++ b/tests/fbo/fbo-1d.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright © 2009 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-1d.c
+ *
+ * Tests that rendering to a 1D texture and then drawing it to the framebuffer
+ * succeeds.
+ */
+
+#define GL_GLEXT_PROTOTYPES
+#if defined(__APPLE__)
+#include <GLUT/glut.h>
+#else
+#include "GL/glut.h"
+#endif
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "piglit-util.h"
+
+#define BUF_WIDTH 32
+#define WIN_WIDTH 50
+#define WIN_HEIGHT 20
+
+static GLboolean Automatic = GL_FALSE;
+
+static void rect(int x1, int y1, int x2, int y2)
+{
+	glBegin(GL_POLYGON);
+	glVertex2f(x1, y1);
+	glVertex2f(x1, y2);
+	glVertex2f(x2, y2);
+	glVertex2f(x2, y1);
+	glEnd();
+}
+
+static int
+create_1d_fbo(void)
+{
+	GLuint tex, fb;
+	GLenum status;
+
+	glGenTextures(1, &tex);
+	glBindTexture(GL_TEXTURE_1D, tex);
+
+	glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA,
+		     BUF_WIDTH,
+		     0,
+		     GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+	assert(glGetError() == 0);
+
+	glGenFramebuffersEXT(1, &fb);
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
+
+	glFramebufferTexture1DEXT(GL_FRAMEBUFFER_EXT,
+				  GL_COLOR_ATTACHMENT0_EXT,
+				  GL_TEXTURE_1D,
+				  tex,
+				  0);
+
+	assert(glGetError() == 0);
+
+	status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
+	if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+		fprintf(stderr, "FBO incomplete\n");
+		goto done;
+	}
+
+	glViewport(0, 0, BUF_WIDTH, 1);
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	glOrtho(0, BUF_WIDTH, 0, 1, -1, 1);
+
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+
+	/* left side: red */
+	glColor4f(1.0, 0.0, 0.0, 0.0);
+	rect(0, 0,
+	     BUF_WIDTH / 2, 1);
+
+	/* right side: green */
+	glColor4f(0.0, 1.0, 0.0, 0.0);
+	rect(BUF_WIDTH / 2, 0,
+	     BUF_WIDTH, 1);
+
+done:
+	glDeleteFramebuffersEXT(1, &fb);
+
+	return tex;
+}
+
+static void
+draw_fbo_1d(int x, int y)
+{
+	glViewport(0, 0, WIN_WIDTH, WIN_HEIGHT);
+
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	glOrtho(0, WIN_WIDTH, 0, WIN_HEIGHT, -1, 1);
+
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+
+	glEnable(GL_TEXTURE_1D);
+	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+	glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+
+	glBegin(GL_QUADS);
+
+	glTexCoord2f(0, 0);
+	glVertex2f(x, y);
+
+	glTexCoord2f(1, 0);
+	glVertex2f(x + BUF_WIDTH, y);
+
+	glTexCoord2f(1, 1);
+	glVertex2f(x + BUF_WIDTH, y + 1);
+
+	glTexCoord2f(0, 1);
+	glVertex2f(x, y + 1);
+
+	glEnd();
+}
+
+static void
+display()
+{
+	GLboolean pass = GL_TRUE;
+	float red[] = {1,0,0,0};
+	float green[] = {0,1,0,0};
+	float *expected;
+	int x;
+	GLuint tex;
+
+	glClearColor(1.0, 1.0, 1.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	tex = create_1d_fbo();
+
+	draw_fbo_1d(10, 10);
+
+	for (x = 0; x < BUF_WIDTH; x++) {
+		if (x < BUF_WIDTH / 2)
+			expected = red;
+		else
+			expected = green;
+
+		pass &= piglit_probe_pixel_rgb(10 + x, 10, expected);
+	}
+
+	glDeleteTextures(1, &tex);
+
+	glutSwapBuffers();
+
+	if (Automatic)
+		piglit_report_result(pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE);
+}
+
+int main(int argc, char**argv)
+{
+	glutInit(&argc, argv);
+	if (argc == 2 && !strcmp(argv[1], "-auto"))
+		Automatic = 1;
+	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
+	glutInitWindowSize(WIN_WIDTH, WIN_HEIGHT);
+	glutCreateWindow("fbo-1d");
+	glutDisplayFunc(display);
+	glutKeyboardFunc(piglit_escape_exit_key);
+
+	piglit_require_extension("GL_EXT_framebuffer_object");
+
+	glutMainLoop();
+
+	return 0;
+}