/*
 * 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-generatemipmap-viewport.c
 *
 * Tests that glGenerateMipmapExt isn't limited in its viewport size by the
 * original drawable's size.
 *
 * Catches a bug in Mesa metaops found by
 * Pierre Willenbrock <pierre@pirsoft.de>.
 */

#include "piglit-util-gl-common.h"

#define TEX_WIDTH 256
#define TEX_HEIGHT 256

PIGLIT_GL_TEST_CONFIG_BEGIN

	config.supports_gl_compat_version = 10;

	config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;

PIGLIT_GL_TEST_CONFIG_END

static const float red[] =   {1, 0, 0, 0};
static const float green[] = {0, 1, 0, 0};
static const float blue[] =  {0, 0, 1, 0};
static const float white[] = {1, 1, 1, 1};

static int
create_fbo(void)
{
	GLuint tex, fb;
	GLenum status;
	int i, dim;

	glGenTextures(1, &tex);
	glBindTexture(GL_TEXTURE_2D, tex);

	for (i = 0, dim = TEX_WIDTH; dim >0; i++, dim /= 2) {
		glTexImage2D(GL_TEXTURE_2D, i, GL_RGBA,
			     dim, dim,
			     0,
			     GL_RGBA, GL_UNSIGNED_BYTE, NULL);
	}
	assert(glGetError() == 0);

	glGenFramebuffersEXT(1, &fb);
	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
	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\n");
		goto done;
	}

	glViewport(0, 0, TEX_WIDTH, TEX_HEIGHT);
	piglit_ortho_projection(TEX_WIDTH, TEX_HEIGHT, GL_FALSE);

	glColor4fv(red);
	piglit_draw_rect(0, 0, TEX_WIDTH / 2, TEX_HEIGHT / 2);
	glColor4fv(green);
	piglit_draw_rect(TEX_WIDTH / 2, 0, TEX_WIDTH, TEX_HEIGHT / 2);
	glColor4fv(blue);
	piglit_draw_rect(0, TEX_HEIGHT / 2, TEX_WIDTH/2, TEX_HEIGHT);
	glColor4fv(white);
	piglit_draw_rect(TEX_WIDTH / 2, TEX_HEIGHT / 2, TEX_WIDTH, TEX_HEIGHT);

	/* Bind back to the (small) window to trigger the bug */
	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

	glGenerateMipmapEXT(GL_TEXTURE_2D);
done:
	glDeleteFramebuffersEXT(1, &fb);

	return tex;
}

static void
draw_mipmap(int x, int y, int dim)
{
	glViewport(0, 0, piglit_width, piglit_height);
	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);

	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

	glEnable(GL_TEXTURE_2D);
	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

	piglit_draw_rect_tex(x, y, dim, dim,
			     0, 0, 1, 1);
}

static GLboolean
test_mipmap_drawing(int start_x, int start_y, int dim)
{
	GLboolean pass = GL_TRUE;

	pass = pass && piglit_probe_rect_rgb(
			start_x, start_y, dim/2, dim/2, red);
	pass = pass && piglit_probe_rect_rgb(
			start_x + dim/2, start_y, dim/2, dim/2, green);
	pass = pass && piglit_probe_rect_rgb(
			start_x, start_y + dim/2, dim/2, dim/2, blue);
	pass = pass && piglit_probe_rect_rgb(
			start_x + dim/2, start_y + dim/2, dim/2, dim/2, white);

	return pass;
}

enum piglit_result
piglit_display(void)
{
	GLboolean pass = GL_TRUE;
	GLuint tex;

	glClearColor(0.5, 0.5, 0.5, 0.5);
	glClear(GL_COLOR_BUFFER_BIT);

	tex = create_fbo();

	draw_mipmap(1, 1, 32);
	pass &= test_mipmap_drawing(1, 1, 32);

	glDeleteTextures(1, &tex);

	piglit_present_results();

	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}

void piglit_init(int argc, char **argv)
{
	piglit_require_extension("GL_EXT_framebuffer_object");
}