4. opengl texturen laden

opengl texturen laden

  • A

    nein, das ist nicht das problem, es sei denn, ma n kann mit diesen libraries in einen bitmap typ laden

    0

  • Ja, das kann man natürlich, genau das ist doch der Zweck dieser Libraries!?

    0
  • A

    gut okay noch ne frage wird bei opengl die bmp direkt in eine glint ungewandelt oder nur der kontrext?

    0

  • Ich versteh die Frage nicht ganz. Du erzeugst eine Textur und ladest dann eben Pixeldaten in diese Textur rein. Ob die aus einer bmp kommen, du die irgendwie prozedural generierst oder von mir aus von einem Webserver lädst, ist OpenGL komplett egal!?

    0
  • A

    ok, ich hab mir devil runtergeladen, und fogenden quellcode , aber c++ beschwert sich über nicht aufgelöste verweise:

    0
  • A

    sorry code fehlt

    #include <stdio.h>
#include <stdlib.h>
#include <math.h>

#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

#include <IL\ilut.h>

// angle of rotation for the camera direction
float angle = 0.0f;

// actual vector representing the camera's direction
float lx=0.0f,lz=-1.0f;

// XZ position of the camera
float x=0.0f, z=5.0f;

// the key states. These variables will be zero
// when no key is being pressesed
float deltaAngle = 0.0f;
float deltaMove = 0;
int xOrigin = -1;

// color for the snowman's nose
float red = 1.0f, blue=0.5f, green=0.5f;

// scale of snowman
float scale = 1.0f;

// default font
void *font = GLUT_STROKE_ROMAN;

// width and height of the window
int h,w;

// variables to compute frames per second
int frame;
long time, timebase;
char s[60];
char currentMode[80];

// this string keeps the last good setting
// for the game mode
char gameModeString[40] = "640x480";

void init();

void changeSize(int ww, int hh) {

	h = hh;
	w = ww;
	// Prevent a divide by zero, when window is too short
	// (you cant make a window of zero width).
	if (h == 0)
		h = 1;

	float ratio =  w * 1.0 / h;

	// Use the Projection Matrix
	glMatrixMode(GL_PROJECTION);

	// Reset Matrix
	glLoadIdentity();

	// Set the viewport to be the entire window
	glViewport(0, 0, w, h);

	// Set the correct perspective.
	gluPerspective(45.0f, ratio, 0.1f, 100.0f);

	// Get Back to the Modelview
	glMatrixMode(GL_MODELVIEW);
}

void drawSnowMan() {

	glScalef(scale, scale, scale);
	glColor3f(1.0f, 1.0f, 1.0f);

// Draw Body
	glTranslatef(0.0f ,0.75f, 0.0f);
	glutSolidSphere(0.75f,20,20);

// Draw Head
	glTranslatef(0.0f, 1.0f, 0.0f);
	glutSolidSphere(0.25f,20,20);

// Draw Eyes
	glPushMatrix();
	glColor3f(0.0f,0.0f,0.0f);
	glTranslatef(0.05f, 0.10f, 0.18f);
	glutSolidSphere(0.05f,10,10);
	glTranslatef(-0.1f, 0.0f, 0.0f);
	glutSolidSphere(0.05f,10,10);
	glPopMatrix();

// Draw Nose
	glColor3f(red, green, blue);
	glRotatef(0.0f,1.0f, 0.0f, 0.0f);
	glutSolidCone(0.08f,0.5f,10,2);

	glColor3f(1.0f, 1.0f, 1.0f);
}

void renderBitmapString(
		float x,
		float y,
		float z,
		void *font,
		char *string) {

	char *c;
	glRasterPos3f(x, y,z);
	for (c=string; *c != '\0'; c++) {
		glutBitmapCharacter(font, *c);
	}
}

void renderStrokeFontString(
		float x,
		float y,
		float z,
		void *font,
		char *string) {  

	char *c;
	glPushMatrix();
	glTranslatef(x, y,z);
	glScalef(0.002f, 0.002f, 0.002f);
	for (c=string; *c != '\0'; c++) {
		glutStrokeCharacter(font, *c);
	}
	glPopMatrix();
}

void restorePerspectiveProjection() {

	glMatrixMode(GL_PROJECTION);
	// restore previous projection matrix
	glPopMatrix();

	// get back to modelview mode
	glMatrixMode(GL_MODELVIEW);
}

void setOrthographicProjection() {

	// switch to projection mode
	glMatrixMode(GL_PROJECTION);

	// save previous matrix which contains the
	//settings for the perspective projection
	glPushMatrix();

	// reset matrix
	glLoadIdentity();

	// set a 2D orthographic projection
	gluOrtho2D(0, w, h, 0);

	// switch back to modelview mode
	glMatrixMode(GL_MODELVIEW);
}

void computePos(float deltaMove) {

	x += deltaMove * lx * 0.1f;
	z += deltaMove * lz * 0.1f;
}

void renderScene(void) {

	if (deltaMove)
		computePos(deltaMove);

	// Clear Color and Depth Buffers
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	// Reset transformations
	glLoadIdentity();
	// Set the camera
	gluLookAt(	x, 1.0f, z,
			x+lx, 1.0f,  z+lz,
			0.0f, 1.0f,  0.0f);

// Draw ground

	glColor3f(0.9f, 0.9f, 0.9f);
	glBegin(GL_QUADS);
		glVertex3f(-100.0f, 0.0f, -100.0f);
		glVertex3f(-100.0f, 0.0f,  100.0f);
		glVertex3f( 100.0f, 0.0f,  100.0f);
		glVertex3f( 100.0f, 0.0f, -100.0f);
	glEnd();

// Draw 36 SnowMen
	char number[3];
	for(int i = -3; i < 3; i++)
		for(int j=-3; j < 3; j++) {
			glPushMatrix();
			glTranslatef(i*10.0f, 0.0f, j * 10.0f);
			drawSnowMan();
			sprintf(number,"%d",(i+3)*6+(j+3));
			renderStrokeFontString(0.0f, 0.5f, 0.0f, (void *)font ,number);
			glPopMatrix();
		}

	// Code to compute frames per second
	frame++;

	time=glutGet(GLUT_ELAPSED_TIME);
	if (time - timebase > 1000) {
		sprintf(s,"Lighthouse3D - FPS:%4.2f",
			frame*1000.0/(time-timebase));
		timebase = time;
		frame = 0;
	}

	setOrthographicProjection();
	void *font= GLUT_BITMAP_8_BY_13;
	glPushMatrix();
	glLoadIdentity();
	renderBitmapString(30,15,0,font,(char *)"GLUT Tutorial @ Lighthouse3D");
	renderBitmapString(30,30,0,font,s);
	renderBitmapString(30,45,0,font,(char *)"F1 - Game Mode  640x480 32 bits");
	renderBitmapString(30,60,0,font,(char *)"F2 - Game Mode  800x600 32 bits");
	renderBitmapString(30,75,0,font,(char *)"F3 - Game Mode 1024x768 32 bits");
	renderBitmapString(30,90,0,font,(char *)"F4 - Game Mode 1280x1024 32 bits");
	renderBitmapString(30,105,0,font,(char *)"F5 - Game Mode 1920x1200 32 bits");
	renderBitmapString(30,120,0,font,(char *)"F6 - Window Mode");
	renderBitmapString(30,135,0,font,(char *)"Esc - Quit");
	renderBitmapString(30,150,0,font,currentMode);
	glPopMatrix();

	restorePerspectiveProjection();

	glutSwapBuffers();
}

// -----------------------------------
//             KEYBOARD
// -----------------------------------

void processNormalKeys(unsigned char key, int xx, int yy) {

	switch (key) {
		case 27:
			if (glutGameModeGet(GLUT_GAME_MODE_ACTIVE) != 0)
				glutLeaveGameMode();
			exit(0);
			break;
	}
}

void pressKey(int key, int xx, int yy) {

	switch (key) {
		case GLUT_KEY_UP : deltaMove = 0.5f; break;
		case GLUT_KEY_DOWN : deltaMove = -0.5f; break;
		case GLUT_KEY_F1:
			// define resolution, color depth
			glutGameModeString("640x480:32");
			// enter full screen
			if (glutGameModeGet(GLUT_GAME_MODE_POSSIBLE)) {
				glutEnterGameMode();
				sprintf(gameModeString,"640x480:32");
				// register callbacks again
				// and init OpenGL context
				init();
			}
			else
				glutGameModeString(gameModeString);
			break;
		case GLUT_KEY_F2:
			// define resolution, color depth
			glutGameModeString("800x600:32");
			// enter full screen
			if (glutGameModeGet(GLUT_GAME_MODE_POSSIBLE)) {
				glutEnterGameMode();
				sprintf(gameModeString,"800x600:32");
				// register callbacks again
				// and init OpenGL context
				init();
			}
			else
				glutGameModeString(gameModeString);
			break;
		case GLUT_KEY_F3:
			// define resolution, color depth
			glutGameModeString("1024x768:32");
			// enter full screen
			if (glutGameModeGet(GLUT_GAME_MODE_POSSIBLE)) {
				glutEnterGameMode();
				sprintf(gameModeString,"1024x768:32");
				// register callbacks again
				// and init OpenGL context
				init();
			}
			else
				glutGameModeString(gameModeString);
			break;
		case GLUT_KEY_F4:
			// define resolution, color depth
			glutGameModeString("1280x1024:32");
			// enter full screen
			if (glutGameModeGet(GLUT_GAME_MODE_POSSIBLE)) {
				glutEnterGameMode();
				sprintf(gameModeString,"1280x1024:32");
				// register callbacks again
				// and init OpenGL context
				init();
			}
			else
				glutGameModeString(gameModeString);
			break;
		case GLUT_KEY_F5:
			// define resolution, color depth
			glutGameModeString("1920x1200");
			// enter full screen
			if (glutGameModeGet(GLUT_GAME_MODE_POSSIBLE)) {
				glutEnterGameMode();
				sprintf(gameModeString,"1920x1200");
				// register callbacks again
				// and init OpenGL context
				init();
			}
			else
				glutGameModeString(gameModeString);
			break;
		case GLUT_KEY_F6:
			// return to default window
			w = 800;h = 600;
			if (glutGameModeGet(GLUT_GAME_MODE_ACTIVE) != 0) {
				glutLeaveGameMode();
				//init();
			}
			break;
	}
	if (glutGameModeGet(GLUT_GAME_MODE_ACTIVE) == 0)
		sprintf(currentMode,"Current Mode: Window");
	else
		sprintf(currentMode,
			"Current Mode: Game Mode %dx%d at %d hertz, %d bpp",
			glutGameModeGet(GLUT_GAME_MODE_WIDTH),
			glutGameModeGet(GLUT_GAME_MODE_HEIGHT),
			glutGameModeGet(GLUT_GAME_MODE_REFRESH_RATE),
			glutGameModeGet(GLUT_GAME_MODE_PIXEL_DEPTH));
}

void releaseKey(int key, int x, int y) {

	switch (key) {
		case GLUT_KEY_UP :
		case GLUT_KEY_DOWN : deltaMove = 0;break;
	}
}

// -----------------------------------
//             MOUSE
// -----------------------------------

void mouseMove(int x, int y) {

	// this will only be true when the left button is down
	if (xOrigin >= 0) {

		// update deltaAngle
		deltaAngle = (x - xOrigin) * 0.001f;

		// update camera's direction
		lx = sin(angle + deltaAngle);
		lz = -cos(angle + deltaAngle);
	}
}

void mouseButton(int button, int state, int x, int y) {

	// only start motion if the left button is pressed
	if (button == GLUT_LEFT_BUTTON) {

		// when the button is released
		if (state == GLUT_UP) {
			angle += deltaAngle;
			xOrigin = -1;
		}
		else  {// state = GLUT_DOWN
			xOrigin = x;
		}
	}
}

void init() {

	// register callbacks
	glutDisplayFunc(renderScene);
	glutReshapeFunc(changeSize);
	glutIdleFunc(renderScene);

	glutIgnoreKeyRepeat(1);
	glutKeyboardFunc(processNormalKeys);
	glutSpecialFunc(pressKey);
	glutSpecialUpFunc(releaseKey);
	glutMouseFunc(mouseButton);
	glutMotionFunc(mouseMove);

	// OpenGL init
	glEnable(GL_DEPTH_TEST);
	glEnable(GL_CULL_FACE);
}

// -----------------------------------
//             MAIN
// -----------------------------------

int main(int argc, char **argv) {

	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
		glutInitWindowPosition(100,100);
	glutInitWindowSize(800,600);
	glutCreateWindow("Lighthouse3D - GLUT Tutorial");
GLuint Tex1 = ilutGLLoadImage("C:/Users/Marvin/Pictures/Textest.bmp");

	// init GLUT and create window

	// register callbacks
	init();

	// enter GLUT event processing cycle
	glutMainLoop();

	return 1;
}
    0

  • Ja, vermutlich weil du die libs nicht gelinked hast, was mich wieder zu dem Punkt von wegen C++ lernen zurückführt...

    0
  • A

    ok ich hab mir devil runtergelden, und di elibs und includes eingebunden, aber es kommt immer, das ein nicht aufgelöster verweis vorhanden sei.
    woran liegt das?

    0
  • K

    alterbro schrieb:

    ok ich hab mir devil runtergelden, und di elibs und includes eingebunden, aber es kommt immer, das ein nicht aufgelöster verweis vorhanden sei.
    woran liegt das?

    dot schrieb:

    Ja, vermutlich weil du die libs nicht gelinked hast, was mich wieder zu dem Punkt von wegen C++ lernen zurückführt...

    0
  • O

    Und niemand schaut sich hier 450 zeilen code durch.

    0
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