/*
 * Copyright © 2009 Intel Corporation
 * Copyright © 2010 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.
 */

/**
 * \file glsl-novertexdata.c
 *
 * Test if we can draw something without specifying/enabling any vertex
 * arrays.  The vertex shader simply sets gl_Position=(0,0,0,1) and we
 * try to draw a GL_POINT.
 *
 * This is an obscure case, but it works with NVIDIA's OpenGL driver,
 * works with Mesa/swrast, but Mesa/gallium fails (at the time of
 * writing this).
 *
 * This test is based on the glsl-dlist-getattriblocation.c test written
 * by Ian.
 *
 * \author Ian Romanick <ian.d.romanick@intel.com>
 * \author Brian Paul
 */

#include "piglit-util.h"
#include "piglit-framework.h"

int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
int piglit_width = 100;
int piglit_height = 100;

static const GLchar *vertShaderText =
	"attribute vec4 attrib;\n"
	"void main()\n"
	"{\n"
	"	gl_Position = vec4(0.0, 0.0, 0.0, 1.0);\n"
	"	gl_FrontColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
	"} \n";


enum piglit_result
piglit_display(void)
{
	static const GLfloat expColor[4] = {0, 1, 0, 1};
	GLint vs;
	GLint prog;
	GLint stat;
	enum piglit_result result;

	vs = glCreateShader(GL_VERTEX_SHADER);
	glShaderSource(vs, 1, &vertShaderText, NULL);

	glCompileShader(vs);
	glGetShaderiv(vs, GL_COMPILE_STATUS, &stat);
	if (!stat) {
                printf("glsl-novertexdata:  error compiling vertex shader!\n");
                exit(1);
        }

	prog = glCreateProgram();
	glAttachShader(prog, vs);
	glLinkProgram(prog);
	glUseProgram(prog);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);

	glClear(GL_COLOR_BUFFER_BIT);

        glPointSize(20.0);
	glDrawArrays(GL_POINTS, 0, 1);

	result = piglit_probe_pixel_rgba(piglit_width /2, piglit_height / 2,
                                         expColor)
		? PIGLIT_PASS : PIGLIT_FAIL;

	glutSwapBuffers();

	return result;
}


void
piglit_init(int argc, char **argv)
{
	if (!GLEW_VERSION_2_0) {
		printf("Requires OpenGL 2.0\n");
		piglit_report_result(PIGLIT_SKIP);
		exit(1);
	}
}