triangle demo works on ubuntu13.04,doesn't work on ubuntu 12.04 - opengl-es-2.0

Question

I get a triangle demo from internet. It works on my ubuntu13.04 virtual machine,but it doesn't work on my ubuntu12.04 virtual machine.All of my two vritual machines installed libgles2-mesa-dev(apt-get).The only diffrenet is:the ubuntu12.04 glesv2 is based on mesa-8.0 and the ubuntu13.04 glesv2 is based on mesa-9.
My code:
#include <GLES2/gl2.h>
#include <EGL/egl.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <unistd.h>
#include <X11/Xlib.h>
#define VERTEX_ARRAY 0
EGLDisplay eglDisplay = 0;
EGLConfig eglConfig = 0;
EGLSurface eglSurface = 0;
EGLContext eglContext = 0;
EGLNativeWindowType eglWindow = 0;
bool TestEGLError()
{
EGLint iErr = eglGetError();
if (iErr != EGL_SUCCESS)
{
return false;
}
return true;
}
bool CreateEGLContext()
{
eglDisplay = eglGetDisplay((EGLNativeDisplayType) EGL_DEFAULT_DISPLAY);
EGLint iMajorVersion, iMinorVersion;
if (!eglInitialize(eglDisplay, &iMajorVersion, &iMinorVersion))
{
return false;
}
const EGLint pi32ConfigAttribs[] =
{
EGL_LEVEL, 0,
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_NATIVE_RENDERABLE, EGL_FALSE,
EGL_DEPTH_SIZE, EGL_DONT_CARE,
EGL_NONE
};
EGLint config16bpp[] = {
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 8,
EGL_DEPTH_SIZE, 16,
EGL_STENCIL_SIZE, 0,
EGL_NONE
};
int iConfigs;
if (!eglChooseConfig(eglDisplay,config16bpp, &eglConfig, 1, &iConfigs) || (iConfigs != 1))
{
return false;
}
eglSurface = eglCreateWindowSurface(eglDisplay, eglConfig, eglWindow, NULL);
if(eglSurface == EGL_NO_SURFACE)
{
eglGetError(); // Clear error
eglSurface = eglCreateWindowSurface(eglDisplay, eglConfig, NULL, NULL);
}
if (!TestEGLError())
{
return false;
}
eglBindAPI(EGL_OPENGL_ES_API);
EGLint ai32ContextAttribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
eglContext = eglCreateContext(eglDisplay, eglConfig, NULL, ai32ContextAttribs);
if (!TestEGLError())
{
return false;
}
eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);
if (!TestEGLError())
{
return false;
}
return true;
}
bool Render()
{
bool bRet = false;
float pfIdentity[] =
{
1.0f,0.0f,0.0f,0.0f,
0.0f,1.0f,0.0f,0.0f,
0.0f,0.0f,1.0f,0.0f,
0.0f,0.0f,0.0f,1.0f
};
char szFragShaderSrc[] = {"\
void main (void)\
{\
gl_FragColor = vec4(1.0, 1.0, 0.66 ,1.0);\
}"};
char szVertShaderSrc[] = {"\
attribute highp vec4 myVertex;\
uniform mediump mat4 myPMVMatrix;\
void main(void)\
{\
gl_Position = myPMVMatrix * myVertex;\
}"};
char * pszFragShader = (char *)szFragShaderSrc;
char * pszVertShader = (char *)szVertShaderSrc;
GLuint uiFragShader = 0;
GLuint uiVertShader = 0;
GLuint uiProgramObject = 0;
GLint bShaderCompiled;
GLint bLinked;
GLuint ui32Vbo = 0;
GLfloat afVertices[] = { -0.4f,-0.4f,0.0f, // Position
0.4f ,-0.4f,0.0f,
0.0f ,0.4f ,0.0f};
int i32InfoLogLength, i32CharsWritten;
char* pszInfoLog = NULL;
int i32Location = 0;
unsigned int uiSize = 0;
uiFragShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(uiFragShader, 1, (const char**)&pszFragShader, NULL);
glCompileShader(uiFragShader);
glGetShaderiv(uiFragShader, GL_COMPILE_STATUS, &bShaderCompiled);
if (!bShaderCompiled)
{
glGetShaderiv(uiFragShader, GL_INFO_LOG_LENGTH, &i32InfoLogLength);
pszInfoLog = new char[i32InfoLogLength];
glGetShaderInfoLog(uiFragShader, i32InfoLogLength, &i32CharsWritten, pszInfoLog);
delete[] pszInfoLog;
goto cleanup;
}
uiVertShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(uiVertShader, 1, (const char**)&pszVertShader, NULL);
glCompileShader(uiVertShader);
glGetShaderiv(uiVertShader, GL_COMPILE_STATUS, &bShaderCompiled);
if (!bShaderCompiled)
{
glGetShaderiv(uiVertShader, GL_INFO_LOG_LENGTH, &i32InfoLogLength);
pszInfoLog = new char[i32InfoLogLength];
glGetShaderInfoLog(uiVertShader, i32InfoLogLength, &i32CharsWritten, pszInfoLog);
delete[] pszInfoLog;
goto cleanup;
}
uiProgramObject = glCreateProgram();
glAttachShader(uiProgramObject, uiFragShader);
glAttachShader(uiProgramObject, uiVertShader);
glBindAttribLocation(uiProgramObject, VERTEX_ARRAY, "myVertex");
glLinkProgram(uiProgramObject);
glGetProgramiv(uiProgramObject, GL_LINK_STATUS, &bLinked);
if (!bLinked)
{
glGetProgramiv(uiProgramObject, GL_INFO_LOG_LENGTH, &i32InfoLogLength);
pszInfoLog = new char[i32InfoLogLength];
glGetProgramInfoLog(uiProgramObject, i32InfoLogLength, &i32CharsWritten, pszInfoLog);
delete[] pszInfoLog;
goto cleanup;
}
glUseProgram(uiProgramObject);
glClearColor(0.6f, 0.8f, 1.0f, 1.0f);
glGenBuffers(1, &ui32Vbo);
glBindBuffer(GL_ARRAY_BUFFER, ui32Vbo);
uiSize = 3 * (sizeof(GLfloat) * 3); // Calc afVertices size (3 vertices * stride (3 GLfloats per vertex))
glBufferData(GL_ARRAY_BUFFER, uiSize, afVertices, GL_STATIC_DRAW);
{
glClear(GL_COLOR_BUFFER_BIT);
i32Location = glGetUniformLocation(uiProgramObject, "myPMVMatrix");
glUniformMatrix4fv( i32Location, 1, GL_FALSE, pfIdentity);
glEnableVertexAttribArray(VERTEX_ARRAY);
glVertexAttribPointer(VERTEX_ARRAY, 3, GL_FLOAT, GL_FALSE, 0, 0);
glDrawArrays(GL_TRIANGLES, 0, 3);
eglSwapBuffers(eglDisplay, eglSurface);
}
bRet = true;
cleanup:
if (uiProgramObject)
glDeleteProgram(uiProgramObject);
if (uiFragShader)
glDeleteShader(uiFragShader);
if (uiVertShader)
glDeleteShader(uiVertShader);
// Delete the VBO as it is no longer needed
if (ui32Vbo)
glDeleteBuffers(1, &ui32Vbo);
return bRet;
}
int main(int argc ,char* argv[])
{
unsigned int uiHeight = 800;
unsigned int uiWidth = 480;
int screen;
Display *x_display;
Window root_window;
x_display = XOpenDisplay ( NULL ); // open the standard display (the primary screen)
if ( x_display == NULL ) {
printf ("cannot connect to X server");
return false;
}
screen = DefaultScreen(x_display);
root_window = RootWindow(x_display,screen);
static int Hnd = XCreateSimpleWindow(x_display, root_window,0,0,800,480,0,0,0);
eglWindow = (EGLNativeWindowType)Hnd;
if (!eglWindow)
{
printf("Failed to create X window.\n");
return false;
}
XUndefineCursor(x_display, eglWindow);
XMapRaised(x_display, eglWindow);
XFlush(x_display);
CreateEGLContext();
while(1)
{
Render();
usleep(100000);
}
return 0;
}