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#include 

#include 

#include 

#include 

#define EGL_EGLEXT_PROTOTYPES

#define GL_GLEXT_PROTOTYPES

#include "EGL/egl.h"

#include "EGL/eglext.h"

#include "GL/gl.h"

#include "gbm.h"

#include 

#include 

#include 

EGLImageKHR px_create_image(EGLDisplay display, EGLContext context,

			 int width, int height, int stride, int name);

GLuint create_framebuffer(int width, int height, GLuint *tex);

GLint create_shader(GLenum type, const char *source);

int main()

{

    struct gbm_device *gbm;

    struct gbm_surface  *gs;

    EGLDisplay dpy;

    EGLint major, minor;

    EGLContext context;

    EGLSurface surface;

    EGLImageKHR front,fb_image;

    EGLConfig config;

    EGLint config_attribs[32];

    EGLint num_configs, i;

    GLuint texture, buffer;

    GLuint f_tex;

    int fd;

    fd = get_service("DISPLAY");

    gbm = gbm_create_device(fd);

    if( gbm == NULL){

        printf("failed to initialize GBM device");

        return 1;

    };

    init_pixlib(HW_BIT_BLIT);

    dpy = eglGetDisplay((EGLNativeDisplayType)gbm);

    if (!eglInitialize(dpy, &major, &minor))

        printf("failed to initialize EGL display");

    printf("EGL_VERSION = %s\n", eglQueryString(dpy, EGL_VERSION));

    printf("EGL_VENDOR = %s\n", eglQueryString(dpy, EGL_VENDOR));

    printf("EGL_EXTENSIONS = %s\n", eglQueryString(dpy, EGL_EXTENSIONS));

    printf("EGL_CLIENT_APIS = %s\n",eglQueryString(dpy, EGL_CLIENT_APIS));

    i = 0;

    config_attribs[i++] = EGL_RED_SIZE;

    config_attribs[i++] = 1;

    config_attribs[i++] = EGL_GREEN_SIZE;

    config_attribs[i++] = 1;

    config_attribs[i++] = EGL_BLUE_SIZE;

    config_attribs[i++] = 1;

    config_attribs[i++] = EGL_DEPTH_SIZE;

    config_attribs[i++] = 1;

    config_attribs[i++] = EGL_SURFACE_TYPE;

    config_attribs[i++] = EGL_WINDOW_BIT;

    config_attribs[i++] = EGL_RENDERABLE_TYPE;

    config_attribs[i++] = EGL_OPENGL_BIT;

    config_attribs[i] = EGL_NONE;

    if (!eglChooseConfig(dpy,config_attribs, &config, 1, &num_configs) || !num_configs)

        printf("failed to choose a config");

    eglBindAPI(EGL_OPENGL_API);

    context = eglCreateContext(dpy, config, EGL_NO_CONTEXT, NULL);

    if (!context)

        printf("failed to create context");

    gs = gbm_surface_create(gbm, 400, 300, GBM_BO_FORMAT_ARGB8888, GBM_BO_USE_RENDERING);

    BeginDraw();

    DrawWindow(20, 20, 400+9, 300+24, "gl-render", 0x000000, 0x74);

    EndDraw();

    sna_create_mask();

    surface = eglCreateWindowSurface(dpy,config, (EGLNativeWindowType)gs, NULL);

    if (surface == EGL_NO_SURFACE)

        printf("failed to create surface");

    if (!eglMakeCurrent(dpy, surface, surface, context))

        printf("failed to make window current");

    front = eglGetBufferImage(dpy, surface, EGL_DRM_BUFFER_BACK);

    glGenTextures(1, &f_tex);

    glBindTexture(GL_TEXTURE_2D, f_tex);

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);

    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D,front);

    glBindTexture(GL_TEXTURE_2D, 0);

    glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);

	glMatrixMode(GL_MODELVIEW);

	glLoadIdentity();

	glViewport(0, 0, 400, 300);

    glClearColor( 0, 0, 0, 1);

    glClear(GL_COLOR_BUFFER_BIT);

    glBegin(GL_QUADS);

    glColor3f(1,0,0);

    glVertex3f( 0.9, -0.9, -30.0);

    glColor3f(1,1,0);

    glVertex3f( 0.9,  0.9, -30.0);

    glColor3f(1,1,1);

    glVertex3f( 0.1,  0.9, -30.0);

    glColor3f(1,0,1);

    glVertex3f( 0.1, -0.9, -30.0);

    glEnd();

    glFlush();

    glBindFramebuffer(GL_FRAMEBUFFER, 0);

    if(fd)

    {

        int ret;

        GLenum status;

        struct drm_i915_fb_info fb;

        memset(&fb, 0, sizeof(fb));

        ret = drmIoctl(fd, SRV_FBINFO, &fb);

        if( ret != 0 )

            printf("failed to get framebuffer info\n");

		fb_image = px_create_image(dpy,context,fb.width,fb.height,

                                   fb.pitch,fb.name);

        printf("fb_image %p\n", fb_image);

        glGenTextures(1, &texture);

        glBindTexture(GL_TEXTURE_2D, texture);

        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);

        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);

        glEGLImageTargetTexture2DOES(GL_TEXTURE_2D,fb_image);

        glBindTexture(GL_TEXTURE_2D, 0);

  	    glGenFramebuffers(1, &buffer);

        glBindFramebuffer(GL_FRAMEBUFFER, buffer);

        glFramebufferTexture2D(GL_FRAMEBUFFER,

					 GL_COLOR_ATTACHMENT0,

					 GL_TEXTURE_2D, texture,0);

        status = glCheckFramebufferStatus(GL_FRAMEBUFFER);

        if (status != GL_FRAMEBUFFER_COMPLETE)

        {

            const char *str;

            switch (status)

            {

                case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:

                    str = "incomplete attachment";

                    break;

                case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:

                    str = "incomplete/missing attachment";

                    break;

                case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER:

                    str = "incomplete draw buffer";

                    break;

                case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER:

                    str = "incomplete read buffer";

                    break;

                case GL_FRAMEBUFFER_UNSUPPORTED:

                    str = "unsupported";

                    break;

                case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE:

                    str = "incomplete multiple";

                    break;

                default:

                    str = "unknown error";

                    break;

            }

            printf("destination is framebuffer incomplete: %s [%#x]\n",

			   str, status);

        }

    }

	glViewport(0, 0, 1024, 768);

    glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	glMatrixMode(GL_MODELVIEW);

	glLoadIdentity();

    const char *vs_src =

	    "attribute vec4 v_position;\n"

	    "attribute vec4 v_texcoord0;\n"

	    "varying vec2 source_texture;\n"

	    "void main()\n"

	    "{\n"

	    "	gl_Position = v_position;\n"

	    "	source_texture = v_texcoord0.xy;\n"

	    "}\n";

	const char *fs_src =

//	    "precision mediump float;\n"

	    "varying vec2 source_texture;\n"

	    "uniform sampler2D sampler;\n"

	    "void main()\n"

	    "{\n"

	    "   vec3 cg = texture2D(sampler, source_texture).rgb;\n"

	    "   gl_FragColor = vec4(cg.r,cg.g,cg.b,1.0);\n"

	    "}\n";

	GLuint blit_prog;

	GLint  vs_shader, fs_shader;

  asm volatile ("int3");

	blit_prog = glCreateProgram();

    vs_shader = create_shader(GL_VERTEX_SHADER,vs_src);

    fs_shader = create_shader(GL_FRAGMENT_SHADER, fs_src);

 	glAttachShader(blit_prog, vs_shader);

 	glAttachShader(blit_prog, fs_shader);

 	glBindAttribLocation(blit_prog, 0, "v_position");

	glBindAttribLocation(blit_prog, 1, "v_texcoord0");

	GLint ok;

	glLinkProgram(blit_prog);

	glGetProgramiv(blit_prog, GL_LINK_STATUS, &ok);

	if (!ok) {

		GLchar *info;

		GLint size;

		glGetProgramiv(blit_prog, GL_INFO_LOG_LENGTH, &size);

		info = malloc(size);

		glGetProgramInfoLog(blit_prog, size, NULL, info);

		printf("Failed to link: %s\n", info);

		printf("GLSL link failure\n");

	}

    GLint sampler;

	float vertices[8], texcoords[8];

    GLfloat dst_xscale, dst_yscale; //, src_xscale, src_yscale;

    int l, t, r, b, stride;

	sampler = glGetUniformLocation(blit_prog,"sampler");

	glUseProgram(blit_prog);

	glUniform1i(sampler, 0);

	glVertexAttribPointer(0, 2, GL_FLOAT,GL_FALSE, 2 * sizeof(float),vertices);

	glEnableVertexAttribArray(0);

	glActiveTexture(GL_TEXTURE0);

	glBindTexture(GL_TEXTURE_2D, f_tex);

	glTexParameteri(GL_TEXTURE_2D,

				  GL_TEXTURE_MIN_FILTER,

				  GL_NEAREST);

	glTexParameteri(GL_TEXTURE_2D,

				  GL_TEXTURE_MAG_FILTER,

				  GL_NEAREST);

	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float),texcoords);

	glEnableVertexAttribArray(1);

	dst_xscale = 1.0/1024;

	dst_yscale = 1.0/768;

//	src_xscale = 1.0/400;

//	src_yscale = 1.0/300;

    stride = 2;

	l = 20;

	t = 20;

	r = l+400;

	b = t+300;

    float t0, t1, t2, t5;

    vertices[0]     = t0 = 2*l*dst_xscale - 1.0;

    vertices[1 * 2] = t2 = 2*r*dst_xscale - 1.0;

    vertices[2 * 2] = t2;

    vertices[3 * 2] = t0;

    vertices[1]     = t1 = 2*t*dst_yscale - 1.0;

    vertices[2*2+1] = t5 = 2*b*dst_yscale - 1.0;

    vertices[1*2+1] = t1;

    vertices[3*2+1] = t5;

    texcoords[0]    = 0.0;

    texcoords[1]    = 0.0;

    texcoords[1*2]  = 1.0;

    texcoords[1*2+1]= 0.0;

    texcoords[2*2]  = 1.0;

    texcoords[2*2+1]= 1.0;

    texcoords[3*2]  = 0.0;

    texcoords[3*2+1]= 1.0;

    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

	glDisableVertexAttribArray(0);

	glDisableVertexAttribArray(1);

	glDisable(GL_TEXTURE_2D);

	glUseProgram(0);

    glFinish();

    eglMakeCurrent(dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);

//    eglDestroySurface(dpy, surface);

  //  gbm_surface_destroy(gs);

    eglDestroyContext(dpy, context);

    eglTerminate(dpy);

    while(1)

    {

        delay(1);

    }

    return 0;

}

int drmIoctl(int fd, unsigned long request, void *arg)

{

    ioctl_t  io;

    io.handle   = fd;

    io.io_code  = request;

    io.input    = arg;

    io.inp_size = 64;

    io.output   = NULL;

    io.out_size = 0;

    return call_service(&io);

}

EGLImageKHR px_create_image(EGLDisplay display, EGLContext context,

			 int width, int height, int stride, int name)

{

	EGLImageKHR image;

	EGLint attribs[] = {

		EGL_WIDTH, 0,

		EGL_HEIGHT, 0,

		EGL_DRM_BUFFER_STRIDE_MESA, 0,

		EGL_DRM_BUFFER_FORMAT_MESA,

		EGL_DRM_BUFFER_FORMAT_ARGB32_MESA,

		EGL_DRM_BUFFER_USE_MESA,

		EGL_DRM_BUFFER_USE_SHARE_MESA |

		    EGL_DRM_BUFFER_USE_SCANOUT_MESA,

		EGL_NONE

	};

	attribs[1] = width;

	attribs[3] = height;

	attribs[5] = stride/4;

    printf("%s w:%d :%d pitch:%d handle %d\n", __FUNCTION__,

           width, height, stride, name);

	image = eglCreateImageKHR(display, context, EGL_DRM_BUFFER_MESA,

						 (void *) (uintptr_t)name, attribs);

	return image;

}

GLint create_shader(GLenum type, const char *source)

{

	GLint ok;

	GLint prog;

	prog = glCreateShader(type);

	glShaderSource(prog, 1, (const GLchar **) &source, NULL);

	glCompileShader(prog);

	glGetShaderiv(prog, GL_COMPILE_STATUS, &ok);

	if (!ok) {

		GLchar *info;

		GLint size;

		glGetShaderiv(prog, GL_INFO_LOG_LENGTH, &size);

		info = malloc(size);

		glGetShaderInfoLog(prog, size, NULL, info);

		printf("Failed to compile %s: %s\n",

                type == GL_FRAGMENT_SHADER ? "FS" : "VS",info);

		printf("Program source:\n%s", source);

		printf("GLSL compile failure\n");

	}

	return prog;

}

GLuint create_framebuffer(int width, int height, GLuint *tex)

{

    GLuint buffer;

    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_RGBA, width, height, 0, GL_RGBA,

			       GL_UNSIGNED_BYTE, NULL);

    glBindTexture(GL_TEXTURE_2D, 0);

    glGenFramebuffers(1, &buffer);

    glBindFramebuffer(GL_FRAMEBUFFER, buffer);

    glFramebufferTexture2D(GL_FRAMEBUFFER,

					 GL_COLOR_ATTACHMENT0,

					 GL_TEXTURE_2D, *tex,0);

   return buffer;

}