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#define EGL_EGLEXT_PROTOTYPES

#define GL_GLEXT_PROTOTYPES

#include "EGL/egl.h"

#include "EGL/eglext.h"

#include "gbm.h"

#include 

#include 

enum px_buffer

{

    PX_FRONT = 0,

    PX_BACK  = 1

};

struct render

{

    EGLDisplay dpy;

    EGLContext context;

    GLuint framebuffer;

    EGLImageKHR front, back, screen;

    GLuint tx_buffers[2];

    GLuint tx_screen;

    int back_buffer;

    GLuint blit_prog;

    GLint sampler;

    float vertices[8], texcoords[8];

};

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);

struct render* create_render(EGLDisplay dpy, EGLSurface surface);

    if( gbm == NULL){

        printf("failed to initialize GBM device");

        printf("failed to create surface");

  asm volatile ("int3");

    render = create_render(dpy, surface);

  	glViewport(0, 0, 1024, 768);

    glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	glMatrixMode(GL_MODELVIEW);

	glLoadIdentity();

    render_swap_buffers(render, 20, 20, 400, 300);

    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)

{

    io.io_code  = request;

    io.input    = arg;

    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;

    shader = glCreateShader(type);

    if(shader == 0)

        goto err;

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

    glCompileShader(shader);

    glGetShaderiv(shader, GL_COMPILE_STATUS, &ok);

	if (!ok) {

		GLchar *info;

		GLint size;

        glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &size);

		info = malloc(size);

        glGetShaderInfoLog(shader, 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");

        free(info);

        glDeleteProgram(shader);

        shader = 0;

	}

}

struct render* create_render(EGLDisplay dpy, EGLSurface surface)

{

    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";

    EGLint config_attribs[14];

    EGLConfig config;

    EGLint num_configs;

    EGLContext context;

    struct drm_i915_fb_info fb;

    GLint  vs_shader, fs_shader;

    GLenum status;

    GLint ret;

    int fd;

    struct render *render;

    fd = get_service("DISPLAY");

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

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

    if( ret != 0 )

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

        goto err;

    };

    render = (struct render*)malloc(sizeof(struct render));

    if(render == NULL)

        goto err;

    render->dpy = dpy;

    render->front = eglGetBufferImage(dpy, surface, EGL_DRM_BUFFER_FRONT);

    if(render->front == EGL_NO_IMAGE_KHR)

        goto err1;

    render->back  = eglGetBufferImage(dpy, surface, EGL_DRM_BUFFER_BACK);

    if( render->back == EGL_NO_IMAGE_KHR)

        goto err2;

    glGenTextures(2, render->tx_buffers);

    if(glGetError() != GL_NO_ERROR)

       goto err3;

    glBindTexture(GL_TEXTURE_2D, render->tx_buffers[EGL_DRM_BUFFER_FRONT]);

    if(glGetError() != GL_NO_ERROR)

       goto err4;

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);

    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D,render->front);

    if(glGetError() != GL_NO_ERROR)

       goto err4;

    glBindTexture(GL_TEXTURE_2D, render->tx_buffers[EGL_DRM_BUFFER_BACK]);

    if(glGetError() != GL_NO_ERROR)

       goto err4;

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);

    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D,render->back);

    if(glGetError() != GL_NO_ERROR)

       goto err4;

    glBindTexture(GL_TEXTURE_2D, 0);

    render->back_buffer = EGL_DRM_BUFFER_BACK;

    context = eglGetCurrentContext();

    config_attribs[0] = EGL_RED_SIZE;

    config_attribs[1] = 1;

    config_attribs[2] = EGL_GREEN_SIZE;

    config_attribs[3] = 1;

    config_attribs[4] = EGL_BLUE_SIZE;

    config_attribs[5] = 1;

    config_attribs[6] = EGL_DEPTH_SIZE;

    config_attribs[7] = 1;

    config_attribs[8] = EGL_SURFACE_TYPE;

    config_attribs[9] = EGL_WINDOW_BIT;

    config_attribs[10] = EGL_RENDERABLE_TYPE;

    config_attribs[11] = EGL_OPENGL_BIT;

    config_attribs[12] = EGL_NONE;

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

    {

        printf("failed to choose a config");

        goto err4;

    }

    render->context = eglCreateContext(dpy, config, EGL_NO_CONTEXT, NULL);

    if (!context)

    {

        printf("failed to create context");

        goto err4;

    };

    if (!eglMakeCurrent(dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, render->context))

    {

        printf("failed to make window current");

        goto err5;

    };

    render->screen = px_create_image(dpy,context,fb.width,fb.height,

                                     fb.pitch,fb.name);

    if(render->screen == EGL_NO_IMAGE_KHR)

        goto err6;

    glGenTextures(1, &render->tx_screen);

    if(glGetError() != GL_NO_ERROR)

       goto err6;

    glBindTexture(GL_TEXTURE_2D, render->tx_screen);

    if(glGetError() != GL_NO_ERROR)

       goto err7;

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);

    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);

    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D,render->screen);

    if(glGetError() != GL_NO_ERROR)

       goto err7;

    glBindTexture(GL_TEXTURE_2D, 0);

    glGenFramebuffers(1, &render->framebuffer);

    if(glGetError() != GL_NO_ERROR)

       goto err8;

    glBindFramebuffer(GL_FRAMEBUFFER, render->framebuffer);

    if(glGetError() != GL_NO_ERROR)

       goto err9;

    glFramebufferTexture2D(GL_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,

                           GL_TEXTURE_2D, render->tx_screen,0);

    status = glCheckFramebufferStatus(GL_FRAMEBUFFER);

    if (status != GL_FRAMEBUFFER_COMPLETE)

    {

        switch (status)

        {

                 str = "incomplete attachment";

                str = "incomplete/missing attachment";

            case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER:

                str = "incomplete draw buffer";

                break;

                break;

            default:

                break;

        }

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

        goto err9;

    }

    render->blit_prog = glCreateProgram();

    if(render->blit_prog == 0)

        goto err9;

    vs_shader = create_shader(GL_VERTEX_SHADER,vs_src);

    if(vs_shader == 0)

        goto err10;

    fs_shader = create_shader(GL_FRAGMENT_SHADER, fs_src);

    if(fs_shader == 0)

        goto err11;

    glAttachShader(render->blit_prog, fs_shader);

    glLinkProgram(render->blit_prog);

    if (!ret)

    {

        GLchar *info;

        glGetProgramiv(render->blit_prog, GL_INFO_LOG_LENGTH, &size);

        info = malloc(size);

        glGetProgramInfoLog(render->blit_prog, size, NULL, info);

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

        printf("GLSL link failure\n");

        free(info);

    }

    render->sampler = glGetUniformLocation(render->blit_prog,"sampler");

    eglMakeCurrent(dpy, surface, surface, context);

    return render;

err11:

    glDeleteShader(vs_shader);

err10:

    glDeleteProgram(render->blit_prog);

err9:

    glDeleteFramebuffers(1, &render->framebuffer);

err8:

    eglDestroyImageKHR(dpy, render->screen);

err7:

    glDeleteTextures(1, &render->tx_screen);

err6:

    eglMakeCurrent(dpy, surface, surface, context);

err5:

    eglDestroyContext(dpy, render->context);

err4:

    glDeleteTextures(2, render->tx_buffers);

err3:

    eglDestroyImageKHR(dpy, render->back);

err2:

    eglDestroyImageKHR(dpy, render->front);

err1:

    free(render);

err:

    return NULL;

};

void render_swap_buffers(struct render *render, int x, int y, int w, int h)

{

    EGLContext context;

    EGLSurface draw, read;

    float dst_xscale, dst_yscale;

    float *vertices  = render->vertices;

    float *texcoords = render->texcoords;

    int r, b;

    if(render == NULL)

        return;

    context = eglGetCurrentContext();

    draw = eglGetCurrentSurface(EGL_DRAW);

    read = eglGetCurrentSurface(EGL_READ);

    eglSwapBuffers(render->dpy,draw);

    if (!eglMakeCurrent(render->dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, render->context))

    {

        printf("failed to make window current");

        goto err1;

    };

    glUseProgram(render->blit_prog);

    glUniform1i(render->sampler, 0);

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

    glEnableVertexAttribArray(0);

    glActiveTexture(GL_TEXTURE0);

    glBindTexture(GL_TEXTURE_2D, render->tx_buffers[render->back_buffer]);

    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),render->texcoords);

    glEnableVertexAttribArray(1);

    dst_xscale = 1.0/1024;

    dst_yscale = 1.0/768;

    r = x+w-1;

    b = y+h-1;

    float t0, t1, t2, t5;

    vertices[0]     = t0 = 2*x*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*y*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);