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I am trying to draw a cube with different colors on each face using OpenGL ES 2.0. I can only draw a cube in one color now. I knew I need to use VertexAttribPointer in this case instead of Uniform, but I probably added them wrongly. Screen shows nothing after I implement my code. Here is my code, can anybody give me a hand? Thank you so much!!!
public class MyCube {
private FloatBuffer vertexBuffer;
private ShortBuffer drawListBuffer;
private ShortBuffer[] ArrayDrawListBuffer;
private FloatBuffer colorBuffer;
private int mProgram;
//For Projection and Camera Transformations
private final String vertexShaderCode =
// This matrix member variable provides a hook to manipulate
// the coordinates of the objects that use this vertex shader
"uniform mat4 uMVPMatrix;" +
"attribute vec4 vPosition;" +
"void main() {" +
// the matrix must be included as a modifier of gl_Position
// Note that the uMVPMatrix factor *must be first* in order
// for the matrix multiplication product to be correct.
" gl_Position = uMVPMatrix * vPosition;" +
"}";
// Use to access and set the view transformation
private int mMVPMatrixHandle;
private final String fragmentShaderCode =
"precision mediump float;" +
"uniform vec4 vColor;" +
"void main() {" +
" gl_FragColor = vColor;" +
"}";
// number of coordinates per vertex in this array
static final int COORDS_PER_VERTEX = 3;
float cubeCoords[] = {
-0.5f, 0.5f, 0.5f, // front top left 0
-0.5f, -0.5f, 0.5f, // front bottom left 1
0.5f, -0.5f, 0.5f, // front bottom right 2
0.5f, 0.5f, 0.5f, // front top right 3
-0.5f, 0.5f, -0.5f, // back top left 4
0.5f, 0.5f, -0.5f, // back top right 5
-0.5f, -0.5f, -0.5f, // back bottom left 6
0.5f, -0.5f, -0.5f, // back bottom right 7
};
// Set color with red, green, blue and alpha (opacity) values
float color[] = { 0.63671875f, 0.76953125f, 0.22265625f, 1.0f };
float red[] = { 1.0f, 0.0f, 0.0f, 1.0f };
float blue[] = { 0.0f, 0.0f, 1.0f, 1.0f };
private short drawOrder[] = {
0, 1, 2, 0, 2, 3,//front
0, 4, 5, 0, 5, 3, //Top
0, 1, 6, 0, 6, 4, //left
3, 2, 7, 3, 7 ,5, //right
1, 2, 7, 1, 7, 6, //bottom
4, 6, 7, 4, 7, 5};//back (order to draw vertices)
final float[] cubeColor =
{
// Front face (red)
1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f,
// Top face (green)
0.0f, 1.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
// Left face (blue)
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 1.0f, 1.0f,
// Right face (yellow)
1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f, 1.0f,
// Bottom face (cyan)
0.0f, 1.0f, 1.0f, 1.0f,
0.0f, 1.0f, 1.0f, 1.0f,
0.0f, 1.0f, 1.0f, 1.0f,
0.0f, 1.0f, 1.0f, 1.0f,
0.0f, 1.0f, 1.0f, 1.0f,
0.0f, 1.0f, 1.0f, 1.0f,
// Back face (magenta)
1.0f, 0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 1.0f, 1.0f
};
public MyCube() {
// initialize vertex byte buffer for shape coordinates
ByteBuffer bb = ByteBuffer.allocateDirect(
// (# of coordinate values * 4 bytes per float)
cubeCoords.length * 4);
bb.order(ByteOrder.nativeOrder());
vertexBuffer = bb.asFloatBuffer();
vertexBuffer.put(cubeCoords);
vertexBuffer.position(0);
// initialize byte buffer for the draw list
ByteBuffer dlb = ByteBuffer.allocateDirect(
// (# of coordinate values * 2 bytes per short)
drawOrder.length * 2);
dlb.order(ByteOrder.nativeOrder());
drawListBuffer = dlb.asShortBuffer();
drawListBuffer.put(drawOrder);
drawListBuffer.position(0);
// initialize byte buffer for the color list
ByteBuffer cb = ByteBuffer.allocateDirect(
// (# of coordinate values * 2 bytes per short)
cubeColor.length * 4);
cb.order(ByteOrder.nativeOrder());
colorBuffer = cb.asFloatBuffer();
colorBuffer.put(cubeColor);
colorBuffer.position(0);
int vertexShader = MyRenderer.loadShader(GLES20.GL_VERTEX_SHADER,
vertexShaderCode);
int fragmentShader = MyRenderer.loadShader(GLES20.GL_FRAGMENT_SHADER,
fragmentShaderCode);
// create empty OpenGL ES Program
mProgram = GLES20.glCreateProgram();
// add the vertex shader to program
GLES20.glAttachShader(mProgram, vertexShader);
// add the fragment shader to program
GLES20.glAttachShader(mProgram, fragmentShader);
// creates OpenGL ES program executables
GLES20.glLinkProgram(mProgram);
}
private int mPositionHandle;
private int mColorHandle;
private final int vertexCount = cubeCoords.length / COORDS_PER_VERTEX;
private final int vertexStride = COORDS_PER_VERTEX * 4; // 4 bytes per vertex
public void draw(float[] mvpMatrix) { // pass in the calculated transformation matrix
// Add program to OpenGL ES environment
GLES20.glUseProgram(mProgram);
// get handle to vertex shader's vPosition member
mPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
// get handle to fragment shader's vColor member
mColorHandle = GLES20.glGetUniformLocation(mProgram, "vColor");
// Enable a handle to the cube vertices
GLES20.glEnableVertexAttribArray(mPositionHandle);
// Prepare the cube coordinate data
GLES20.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX,
GLES20.GL_FLOAT, false,
vertexStride, vertexBuffer);
// Set color for drawing the triangle
//mColorHandle = GLES20.glGetUniformLocation(mProgram, "vColor");
// Enable a handle to the cube colors
GLES20.glEnableVertexAttribArray(mColorHandle);
// Prepare the cube color data
GLES20.glVertexAttribPointer(mColorHandle, 4, GLES20.GL_FLOAT, false, 16, colorBuffer);
// Set the color for each of the faces
//GLES20.glUniform4fv(mColorHandle, 1, blue, 0);
//***When I add this line of code above, it can show a cube totally in blue.***
// get handle to shape's transformation matrix
mMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
// Pass the projection and view transformation to the shader
GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, mvpMatrix, 0);
// Draw the cube
GLES20.glDrawElements(GLES20.GL_TRIANGLES, drawOrder.length, GLES20.GL_UNSIGNED_SHORT, drawListBuffer);
// Disable vertex array
GLES20.glDisableVertexAttribArray(mPositionHandle);
GLES20.glDisableVertexAttribArray(mColorHandle);
GLES20.glDisableVertexAttribArray(mMVPMatrixHandle);
}
}
Remove the uniform variable vColor declaration from the fragment shader. Define the new per-vertex attribute input variable in the vertex shader, write that value to a varying variable which is output by the vertex shader, and add as a varying input which is read by the fragment shader.
Consider I have used the OpenGL Control class as follows: (No need to read the code, I have just made slight changes to be able to use the code in more than one opengl window)
OpenGLControl.cpp
#include "stdafx.h"
#include "OpenGLControl.h"
COpenGLControl::COpenGLControl(void)
{
m_fPosX = 0.0f; // X position of model in camera view
m_fPosY = 0.0f; // Y position of model in camera view
m_fZoom = 10.0f; // Zoom on model in camera view
m_fRotX = 0.0f; // Rotation on model in camera view
m_fRotY = 0.0f; // Rotation on model in camera view
m_bIsMaximized = false;
}
COpenGLControl::~COpenGLControl(void)
{
}
BEGIN_MESSAGE_MAP(COpenGLControl, CWnd)
ON_WM_PAINT()
ON_WM_SIZE()
ON_WM_CREATE()
ON_WM_TIMER()
ON_WM_MOUSEMOVE()
END_MESSAGE_MAP()
void COpenGLControl::OnPaint()
{
//CPaintDC dc(this); // device context for painting
ValidateRect(NULL);
}
void COpenGLControl::OnSize(UINT nType, int cx, int cy)
{
wglMakeCurrent(hdc, hrc);
CWnd::OnSize(nType, cx, cy);
if (0 >= cx || 0 >= cy || nType == SIZE_MINIMIZED) return;
// Map the OpenGL coordinates.
glViewport(0, 0, cx, cy);
// Projection view
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
// Set our current view perspective
gluPerspective(35.0f, (float)cx / (float)cy, 0.01f, 2000.0f);
// Model view
glMatrixMode(GL_MODELVIEW);
wglMakeCurrent(NULL, NULL);
}
int COpenGLControl::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CWnd::OnCreate(lpCreateStruct) == -1) return -1;
oglInitialize();
return 0;
}
void COpenGLControl::OnDraw(CDC *pDC)
{
wglMakeCurrent(hdc,hrc);
// If the current view is perspective...
glLoadIdentity();
glTranslatef(0.0f, 0.0f, -m_fZoom);
glTranslatef(m_fPosX, m_fPosY, 0.0f);
glRotatef(m_fRotX, 1.0f, 0.0f, 0.0f);
glRotatef(m_fRotY, 0.0f, 1.0f, 0.0f);
wglMakeCurrent(NULL, NULL);
}
void COpenGLControl::OnTimer(UINT nIDEvent)
{
wglMakeCurrent(hdc,hrc);
switch (nIDEvent)
{
case 1:
{
// Clear color and depth buffer bits
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Draw OpenGL scene
oglDrawScene();
// Swap buffers
SwapBuffers(hdc);
break;
}
default:
break;
}
CWnd::OnTimer(nIDEvent);
wglMakeCurrent(NULL, NULL);
}
void COpenGLControl::OnMouseMove(UINT nFlags, CPoint point)
{
wglMakeCurrent(hdc,hrc);
int diffX = (int)(point.x - m_fLastX);
int diffY = (int)(point.y - m_fLastY);
m_fLastX = (float)point.x;
m_fLastY = (float)point.y;
// Left mouse button
if (nFlags & MK_LBUTTON)
{
m_fRotX += (float)0.5f * diffY;
if ((m_fRotX > 360.0f) || (m_fRotX < -360.0f))
{
m_fRotX = 0.0f;
}
m_fRotY += (float)0.5f * diffX;
if ((m_fRotY > 360.0f) || (m_fRotY < -360.0f))
{
m_fRotY = 0.0f;
}
}
// Right mouse button
else if (nFlags & MK_RBUTTON)
{
m_fZoom -= (float)0.1f * diffY;
}
// Middle mouse button
else if (nFlags & MK_MBUTTON)
{
m_fPosX += (float)0.05f * diffX;
m_fPosY -= (float)0.05f * diffY;
}
OnDraw(NULL);
CWnd::OnMouseMove(nFlags, point);
wglMakeCurrent(NULL, NULL);
}
void COpenGLControl::oglCreate(CRect rect, CWnd *parent,CString windowName)
{
CString className = AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW | CS_OWNDC, NULL, (HBRUSH)GetStockObject(BLACK_BRUSH), NULL);
CreateEx(0, className,windowName, WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, rect, parent, 0);
// Set initial variables' values
m_oldWindow = rect;
m_originalRect = rect;
hWnd = parent;
}
void COpenGLControl::oglInitialize(void)
{
// Initial Setup:
//
static PIXELFORMATDESCRIPTOR pfd =
{
sizeof(PIXELFORMATDESCRIPTOR),
1,
PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER,
PFD_TYPE_RGBA,
32, // bit depth
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
24, // z-buffer depth
8,0,PFD_MAIN_PLANE, 0, 0, 0, 0,
};
// Get device context only once.
hdc = GetDC()->m_hDC;
// Pixel format.
m_nPixelFormat = ChoosePixelFormat(hdc, &pfd);
SetPixelFormat(hdc, m_nPixelFormat, &pfd);
// Create the OpenGL Rendering Context.
hrc = wglCreateContext(hdc);
wglMakeCurrent(hdc, hrc);
// Basic Setup:
//
// Set color to use when clearing the background.
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClearDepth(1.0f);
// Turn on backface culling
glFrontFace(GL_CCW);
glCullFace(GL_BACK);
// Turn on depth testing
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
// Send draw request
OnDraw(NULL);
wglMakeCurrent(NULL, NULL);
}
void COpenGLControl::oglDrawScene(void)
{
wglMakeCurrent(hdc, hrc);
// Wireframe Mode
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glBegin(GL_QUADS);
// Front Side
glVertex3f( 1.0f, 1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
glVertex3f(-1.0f, -1.0f, 1.0f);
glVertex3f( 1.0f, -1.0f, 1.0f);
// Back Side
glVertex3f(-1.0f, -1.0f, -1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glVertex3f( 1.0f, 1.0f, -1.0f);
glVertex3f( 1.0f, -1.0f, -1.0f);
// Top Side
glVertex3f( 1.0f, 1.0f, 1.0f);
glVertex3f( 1.0f, 1.0f, -1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
// Bottom Side
glVertex3f(-1.0f, -1.0f, -1.0f);
glVertex3f( 1.0f, -1.0f, -1.0f);
glVertex3f( 1.0f, -1.0f, 1.0f);
glVertex3f(-1.0f, -1.0f, 1.0f);
// Right Side
glVertex3f( 1.0f, 1.0f, 1.0f);
glVertex3f( 1.0f, -1.0f, 1.0f);
glVertex3f( 1.0f, -1.0f, -1.0f);
glVertex3f( 1.0f, 1.0f, -1.0f);
// Left Side
glVertex3f(-1.0f, -1.0f, -1.0f);
glVertex3f(-1.0f, -1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glEnd();
wglMakeCurrent(NULL, NULL);
}
MyOpenGLTestDlg.h
COpenGLControl m_oglWindow;
COpenGLControl m_oglWindow2;
MyOpenGLTestDlg.cpp
// TODO: Add extra initialization here
CRect rect;
// Get size and position of the picture control
GetDlgItem(ID_OPENGL)->GetWindowRect(rect);
// Convert screen coordinates to client coordinates
ScreenToClient(rect);
// Create OpenGL Control window
CString s1("OPEN_GL");
m_oglWindow.oglCreate(rect, this,s1);
// Setup the OpenGL Window's timer to render
m_oglWindow.m_unpTimer = m_oglWindow.SetTimer(1, 1, 0);
CRect rect2;
GetDlgItem(ID_OPENGL2)->GetWindowRect(rect2);
ScreenToClient(rect2);
CString s2("OPEN_GL2");
m_oglWindow2.oglCreate(rect2, this,s2);
m_oglWindow2.m_unpTimer = m_oglWindow2.SetTimer(1, 1, 0);
The problem is when I only create one OpenGL window, the system shows:
physical memoey: 48%
CPU usage: 54%
and when I create two windows, it shows:
physical memoey: 48%
CPU usage: 95%
I'm concerned that, it is only for such simple geometries!!!
How will be the usage for two opengl windows showing textures??
Is there anyway to reduce the usage?
BTW: why is the usage so much as mensioned?
CPU usage doesn't actually indicate anything about the complexity of your application. If you draw in a tight loop, one frame after the other with no delay or VSYNC enabled you can achieve 100% CPU utilization. What this tells you is you are not GPU bound. The same way if your GPU usage (yes, you can measure this with vendor-specific APIs) is >95% then you are not CPU bound.
In short, you should expect to see very high CPU usage if the GPU is not doing anything particularly complicated :) You can always increase the sleep/timer interval to reduce CPU utilization. Remember that CPU utilization is measured as the time spent doing work versus the total time the OS gave a thread/process. Time spent working is inversely related to time spent waiting (for I/O, sleep, etc.). If you increase the time spent waiting, it will reduce the time spent working, and therefore your reported utilization.
You can also reduce the CPU usage just by enabling VSYNC. Since that will block the calling thread until the VBLANK interval comes around (often 16.666 ms).
It should also be noted that a 1 ms timer interval on your OpenGL timer is excessively low. I cannot think of a lot of applications that need to draw 1000 times a second :) Try something slightly below your target refresh rate (e.g. Monitor = 60 Hz, then try a 10-15 ms timer interval)
This needs more investigation but you may have problems with your main-loop.
This probably is not a problem with OpenGL, but with usage of WinApi. When you add textures, models, shaders... your cpu usage should be similar.
You use SetTimer(1, 1, 0); it means 1 millisecond of delay as I understand? Can you change it to 33 milliseconds (33 FPS)?
That way you will not kill your message pump in mfc app. Note that this timer is very imprecise.
link to [Basic MFC + OpenGL Message loop], (http://archive.gamedev.net/archive/reference/articles/article2204.html), using OnIdle()
Here is a great tutorial about MFC + opengl + threading - #songho
https://gamedev.stackexchange.com/questions/8623/a-good-way-to-build-a-game-loop-in-opengl - discussoion regarding mail loop in GLUT
I'm getting started with OpenGL. I need to do a project using glaux.h. My problem is that I'm running Mac OS X Lion, so I cannot use glaux.
I was searching on the web and I found some codes that try to replace glaux. Codes were fine, but they use Windows Api variables. So obviously I can't use them. Here is the code that I need to read using glaux:
#include <stdio.h> // Header File For Standard Input/Output
#include <stdlib.h>
#include <GLUT/glut.h>
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#include "bmp.h"
#include <string.h>
const int W_WIDTH = 500; // PreselecciÛn del ancho de la ventana
const int W_HEIGHT = 500; // PreselecciÛn del alto de la ventana
bool keys[256]; // Array Used For The Keyboard Routine
bool active=1; // Window Active Flag Set To TRUE By Default
bool fullscreen=TRUE; // Fullscreen Flag Set To Fullscreen Mode By Default
bool fullscreen=0; // Fullscreen Flag Set To Fullscreen Mode By Default
GLuint texture[1]; // Storage For 1 Texture
GLuint box; // Storage For The Box Display List
GLuint top; // Storage For The Top Display List
GLuint xloop; // Loop For X Axis
GLuint yloop; // Loop For Y Axis
GLfloat xrot; // Rotates Cube On The X Axis
GLfloat yrot; // Rotates Cube On The Y Axis
static GLfloat boxcol[5][3]=
{
{1.0f,0.0f,0.0f},{1.0f,0.5f,0.0f},{1.0f,1.0f,0.0f},{0.0f,1.0f,0.0f},{0.0f,1.0f,1.0f}
};
static GLfloat topcol[5][3]=
{
{.5f,0.0f,0.0f},{0.5f,0.25f,0.0f},{0.5f,0.5f,0.0f},{0.0f,0.5f,0.0f},{0.0f,0.5f,0.5f}
};
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); // Declaration For WndProc
// Build Cube Display Lists
GLvoid BuildLists()
{
box=glGenLists(2); // Generate 2 Different Lists
glNewList(box,GL_COMPILE); // Start With The Box List
glBegin(GL_QUADS);
// Bottom Face
glNormal3f( 0.0f,-1.0f, 0.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
// Front Face
glNormal3f( 0.0f, 0.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
// Back Face
glNormal3f( 0.0f, 0.0f,-1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
// Right face
glNormal3f( 1.0f, 0.0f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
// Left Face
glNormal3f(-1.0f, 0.0f, 0.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glEnd();
glEndList();
top=box+1; // Storage For "Top" Is "Box" Plus One
glNewList(top,GL_COMPILE); // Now The "Top" Display List
glBegin(GL_QUADS);
// Top Face
glNormal3f( 0.0f, 1.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glEnd();
glEndList();
}
AUX_RGBImageRec *LoadBMP(char *Filename) // Loads A Bitmap Image
{
FILE *File=NULL; // File Handle
if (!Filename) // Make Sure A Filename Was Given
{
return NULL; // If Not Return NULL
}
File=fopen(Filename,"r"); // Check To See If The File Exists
if (File) // Does The File Exist?
{
fclose(File); // Close The Handle
return new AUX_RGBImageRec(Filename); // Load The Bitmap And Return A Pointer
}
return NULL; // If Load Failed Return NULL
}
int LoadGLTextures() // Load Bitmaps And Convert To Textures
{
int Status=0; // Status Indicator
char ruta[100]="Data/Cube.bmp";
AUX_RGBImageRec *TextureImage[1]; // Create Storage Space For The Texture
memset(TextureImage,0,sizeof(void *)*1); // Set The Pointer To NULL
// Load The Bitmap, Check For Errors, If Bitmap's Not Found Quit
if (TextureImage[0]==LoadBMP(ruta))
{
Status=1; // Set The Status To TRUE
glGenTextures(1, &texture[0]); // Create The Texture
// Typical Texture Generation Using Data From The Bitmap
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
}
if (TextureImage[0]) // If Texture Exists
{
if (TextureImage[0]->data) // If Texture Image Exists
{
free(TextureImage[0]->data); // Free The Texture Image Memory
}
free(TextureImage[0]); // Free The Image Structure
}
return Status; // Return The Status
}
GLvoid ReSizeGLScene(GLsizei width, GLsizei height) // Resize And Initialize The GL Window
{
if (height==0) // Prevent A Divide By Zero By
{
height=1; // Making Height Equal One
}
glViewport(0,0,width,height); // Reset The Current Viewport
glMatrixMode(GL_PROJECTION); // Select The Projection Matrix
glLoadIdentity(); // Reset The Projection Matrix
// Calculate The Aspect Ratio Of The Window
gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);
glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix
glLoadIdentity(); // Reset The Modelview Matrix
}
int InitGL() // All Setup For OpenGL Goes Here
{
if (!LoadGLTextures()) // Jump To Texture Loading Routine
{
return 0; // If Texture Didn't Load Return FALSE
}
BuildLists(); // Jump To The Code That Creates Our Display Lists
glEnable(GL_TEXTURE_2D); // Enable Texture Mapping
glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background
glClearDepth(1.0f); // Depth Buffer Setup
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glEnable(GL_COLOR_MATERIAL); // Enable Material Coloring
return 1; // Initialization Went OK
}
void DrawGLScene() // Here's Where We Do All The Drawing
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //Clear The Screen And The DepthB
glBindTexture(GL_TEXTURE_2D, texture[0]);
for (yloop=1;yloop<6;yloop++)
{
for (xloop=0;xloop<yloop;xloop++)
{
//Poner vuestro codigo no hace falta que se ve axactamente igual
}
}
// Vacia los buffers de dibujo
glutSwapBuffers();
glFlush();
}
int main(int argc, char **argv) {
glutInit(&argc, argv);
glutInitWindowPosition(100,100);
glutInitWindowSize (W_WIDTH, W_HEIGHT);
glutInitDisplayMode (GLUT_RGBA | GLUT_DOUBLE);
glutCreateWindow("Ventana con el Visual C++ y glut");
glutDisplayFunc(DrawGLScene);
glutReshapeFunc(ReSizeGLScene);
// Funciones de inicializacion
InitGL();
glutMainLoop();
return 0;
}
Now that GLKit is available on OS X, I suggest you give that a look. Erik Buck's book Learning OpenGL ES for iOS is written around that framework, with an iOS focus, but he has a blog post and sample project showing a port to OS X 10.8.
Another idea, if you're allowed to step back from OpenGL, is to use SceneKit. It's a 10.8 only framework, not available on any platform other than Mac. It exposes most of the same controls that you have in OpenGL, but it is fundamentally an Objective-C, object-based design, and integrates well with Core Animation. Documentation is sparse but it's pretty easy to get things running. I found it much easier to wrap my brain around SceneKit than around OpenGL. Best intro is the WWDC 2012 video.
I am writing a small program to simulate animation. I use QGLWidget to display a dynamic image to mimic picture animation. The basic idea is to use texture and update it through QGLFamebufferOject::blitFramebuffer. Each time, the image array will be changed and then frame buffer will be changed.
The code can run and the image can be moved forward, but image has chopping problem, or flicking, not smooth.
Following is the code for a class:
GLWidget::GLWidget(QWidget *parent) : QGLWidget(QGLFormat(), parent)
{
makeCurrent();
if (QGLFramebufferObject::hasOpenGLFramebufferBlit()) {
QGLFramebufferObjectFormat format;
render_fbo = new QGLFramebufferObject(640, 480, format);
texture_fbo = new QGLFramebufferObject(640, 480);
} else {
render_fbo = new QGLFramebufferObject(640, 480);
texture_fbo = render_fbo;
}
tile_list = glGenLists(1);
glNewList(tile_list, GL_COMPILE);
glBegin(GL_QUADS);
{
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
}
glEnd();
glEndList();
backbufferImg = new unsigned char[640 * 480 * sizeof(unsigned char) * 3];
}
GLWidget::~GLWidget()
{
}
void GLWidget::initializeGL()
{
}
void GLWidget::resizeGL(int width, int height)
{
}
void GLWidget::paintGL()
{
}
void GLWidget::saveGLState()
{
glPushAttrib(GL_ALL_ATTRIB_BITS);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
}
void GLWidget::restoreGLState()
{
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glPopAttrib();
}
void GLWidget::changeTextureImage(int nextColumn, int direction)
{
// code about chaning backbufferImg
// ...
// call draw
draw();
}
void GLWidget::draw()
{
makeCurrent();
QPainter p(this); // used for text overlay
// save the GL state set for QPainter
saveGLState();
QPainter fbo_painter(render_fbo);
QImage renderImg(backbufferImg, 640, 480, QImage::Format_RGB888);
fbo_painter.begin(render_fbo);
QRect rect(640, 480);
fbo_painter.drawImage(rect, renderImg, rect);
fbo_painter.end();
if (render_fbo != texture_fbo) {
QGLFramebufferObject::blitFramebuffer(texture_fbo, rect, render_fbo, rect);
} else {
// qDebug() << "render_fbo == texture_fbo";
}
// draw into the GL widget
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(0, 0, width(), height());
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBindTexture(GL_TEXTURE_2D, texture_fbo->texture());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glEnable(GL_TEXTURE_2D);
glPushMatrix();
glScalef(1.0f, 1.0f, 1.0f);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glCallList(tile_list);
glPopMatrix();
// restore the GL state that QPainter expects
restoreGLState();
glFinish();
}
Qt's QGLWidget expects that you perform all drawing operations from its overloaded paintGL function so that it iteracts nicely with Qt's double buffer management.
Also why are you taking that detour over a FBO to update a texture? This is highly inefficient and introduces a lot of synchronization points. Use a Pixel Buffer Object and update the texture with glTexSubImage2D.
Thank you very much! I have changed the code and put the drawing code inside paintGL and didn't use FBO's blit method. MUch better, but still need to improve the code. The following is the code:
GLWidget::GLWidget(QWidget *parent) :
QGLWidget(QGLFormat(), parent)
{
makeCurrent();
fbo = new QGLFramebufferObject(WIDTH, HEIGHT);
tile_list = glGenLists(1);
glNewList(tile_list, GL_COMPILE);
glBegin(GL_QUADS);
{
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
}
glEnd();
glEndList();
backbufferImg = new unsigned char[WIDTH * HEIGHT * sizeof(unsigned char) * 3];
}
GLWidget::~GLWidget()
{
glDeleteLists(tile_list, 1);
delete fbo;
delete backbufferImg;
}
void GLWidget::initializeGL()
{
}
void GLWidget::resizeGL(int width, int height)
{
}
void GLWidget::paintGL()
{
glViewport(0, 0, fbo->size().width(), fbo->size().height());
glMatrixMode(GL_MODELVIEW);
// render to the framebuffer object
fbo->bind();
glBindTexture(GL_TEXTURE_2D, refreshTexture);
glCallList(tile_list);
fbo->release();
//////////////////////////////////////////////////////////////////////
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(0, 0, width(), height());
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBindTexture(GL_TEXTURE_2D, fbo->texture());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glEnable(GL_TEXTURE_2D);
glPushMatrix();
glScalef(1.0f, 1.0f, 1.0f);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glCallList(tile_list);
glPopMatrix();
// restore the GL state that QPainter expects
restoreGLState();
glFinish();
}
void GLWidget::saveGLState()
{
glPushAttrib(GL_ALL_ATTRIB_BITS);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
}
void GLWidget::restoreGLState()
{
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glPopAttrib();
}
void GLWidget::refreshTextureImage(int nextColumn, int direction)
{
// upadte backbufferImg
// add code...
QImage renderImg(backbufferImg, WIDTH, HEIGHT, QImage::Format_RGB888);
refreshTexture = bindTexture(renderImg);
updateGL();
}
I will try the method you suggested. But I think framebuffer and pixel buffer in the same level. It means there is no much performance difference. For glTexSubImage2D, I am not quite sure, I need to check it.
Thank you so much.
I am trying to understand the perspective view in OpenGL.
What I am trying to do is render two identical triangles, but at different z coordinates, so I assume they should appear at different sizes. Here is my code:
CUSTOMVERTEX Vertices[] =
{
{ 0.5f, 1.0f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f }, // x, y, z, color
{ 0.0f, 0.0f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f },
{ 1.0f, 0.0f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f },
};
and for drawing
glDrawArrays(GL_TRIANGLES,0, 3);
glTranslatef(0.0f,-1.0f,-1.5f);
glDrawArrays(GL_TRIANGLES,0, 3);
and here is how I init some attributes
glShadeModel(GL_SMOOTH);
glClearDepthf(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glEnable(GL_CULL_FACE);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustumf(-1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 100.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
but the triangles appear at the same size, just at different locations as I translated Y.
Can someone please explain to me?
You cannot use 0.0 for the perspective projection's near-Z value. It must be a positive number greater than zero. Preferably on the order of 1.0 or so.
As Nicol said you should use numbers greater than 0 for frustrum construction. I strongly suggest you to read this article to understand why it is so.