/*
 * Copyright © 2011 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.
 */

/**
 * \file glsl-fs-flat-color.c
 * Test that gl_Color works correctly with GL_SHADE_MODEL of GL_FLAT
 */
#include "piglit-util.h"

int piglit_width = 30, piglit_height = 30;
int piglit_window_mode = GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE;

GLuint prog;

GLvoid
draw_rect(float x, float y, float w, float h, float *color)
{
	float verts[4][4];
	float colors[16];

	verts[0][0] = x;
	verts[0][1] = y;
	verts[0][2] = 0.0;
	verts[0][3] = 1.0;
	verts[1][0] = x + w;
	verts[1][1] = y;
	verts[1][2] = 0.0;
	verts[1][3] = 1.0;
	verts[2][0] = x + w;
	verts[2][1] = y + h;
	verts[2][2] = 0.0;
	verts[2][3] = 1.0;
	verts[3][0] = x;
	verts[3][1] = y + h;
	verts[3][2] = 0.0;
	verts[3][3] = 1.0;

	/* Fill in just the first color.  We're flat shading, after all. */
	memset(&colors, 0, sizeof(colors));
	memcpy(colors, color, 4 * sizeof(float));

	glVertexPointer(4, GL_FLOAT, 0, verts);
	glEnableClientState(GL_VERTEX_ARRAY);
	glColorPointer(4, GL_FLOAT, 0, colors);
	glEnableClientState(GL_COLOR_ARRAY);

	glDrawArrays(GL_POLYGON, 0, 4);

	glDisableClientState(GL_VERTEX_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);
}

enum piglit_result
piglit_display(void)
{
	float green[4] = { 0.0, 1.0, 0.0, 1.0 };
	enum piglit_result result = PIGLIT_PASS;

	glShadeModel(GL_FLAT);

	draw_rect(-1, -1, 2, 2, green);

	if (!piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green))
		result = PIGLIT_FAIL;

	if (!piglit_automatic)
		glutSwapBuffers();

	return result;
}

void
piglit_init(int argc, char **argv)
{
	GLuint vs, fs;

	if (piglit_get_gl_version() < 20) {
		printf("Requires OpenGL 2.0\n");
		piglit_report_result(PIGLIT_SKIP);
	}

	vs = piglit_compile_shader(GL_VERTEX_SHADER,
				   "shaders/glsl-color-mvp.vert");
	fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
				   "shaders/glsl-color.frag");

	prog = piglit_link_simple_program(vs, fs);

	glDeleteShader(vs);
	glDeleteShader(fs);

	/* Don't try to render if the program failed to link, and linking
	 * had better succeed!
	 */
	if (!piglit_link_check_status(prog))
		piglit_report_result(PIGLIT_FAIL);

	glUseProgram(prog);
}