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| #include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include <GL/glut.h>
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
/*
COMPILATION :
gcc ./Main.c -o ./Main.out -lGL -lglut -lGLU `sdl-config --cflags --libs` -lSDL_image
*/
#define BUFFER_OFFSET(a) ((char*)NULL + (a))
static void affichage(GLfloat *tabCouleur);
static unsigned char* chargementImage(int *width, int *height);
static void clavier();
static Uint32 getpixel(SDL_Surface *surface, int x, int y);
void makeVBO(unsigned char *matrice, int width, int height);
GLfloat * initCouleur(int width, int height, GLfloat r, GLfloat v, GLfloat b);
static GLuint id;
static GLfloat *tabVertex = NULL;
static GLfloat posCamZ = 0.0;
static GLfloat angleZ = 0.0;
static GLfloat angleX = 0.0;
static GLfloat Z = 0.0;
static GLfloat posCamX = 0.0;
static GLfloat posCamY = 0.0;
//Génération du tableau de couleur
GLfloat * initCouleur(int width, int height, GLfloat r, GLfloat v, GLfloat b)
{
GLfloat *tabCouleur = NULL;
tabCouleur = calloc((width * height)*3, sizeof(tabCouleur));
int i = 0, rank = 0;
for(i=0; i < (((width * height)*3)-1); i++)
{
if(rank == 0)
{
tabCouleur[i] = r;
rank++;
}
else if(rank == 1)
{
tabCouleur[i] = v;
rank++;
}
else
{
rank = 0;
tabCouleur[i] = b;
}
}
return tabCouleur;
free(tabCouleur);
}
//Génération du VBO qu'on va afficher
void makeVBO(unsigned char *matrice, int width, int height)
{
GLfloat *matriceVertex = NULL;
int i = 0, rank = 0, loopLargeur = width - 1, j=0;
GLfloat x=0.0, y=0.0, z=0.0;
matriceVertex = calloc((width * height)*3, sizeof *matriceVertex);
for(i=0, j=0; i < ((width*height)*3); i+=3, j++)
{
matriceVertex[i] = x;
matriceVertex[i+1] = (GLfloat)matrice[j];
matriceVertex[i+2] = z;
x+=3;
if(!(x < width*3))
{
z += 3.0;
x = 0.0;
}
}
for(j=0; j < ((width*height)*3); j++)
printf("%d: %lf\n", j, matriceVertex[j]);
glGenBuffers(1, &id);
glBindBuffer(GL_ARRAY_BUFFER, id);
glBufferData(GL_ARRAY_BUFFER, sizeof(matriceVertex), matriceVertex, GL_STATIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, ((width * height)*3) * sizeof(matriceVertex), matriceVertex);
glBindBuffer(GL_ARRAY_BUFFER, 0);
fprintf(stdout, "Mise en place du VBO : %d vertex\n", (width * height));
free(matrice);
free(matriceVertex);
}
Uint32 getpixel(SDL_Surface *surface, int x, int y)
{
int bpp = surface->format->BytesPerPixel;
Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
switch(bpp)
{
case 1:
return *p;
case 2:
return *(Uint16 *)p;
case 3:
if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
return p[0] << 16 | p[1] << 8 | p[2];
else
return p[0] | p[1] << 8 | p[2] << 16;
case 4:
return *(Uint32 *)p;
default:
return 0;
}
}
//Chargement de mon image dans un tableau
unsigned char* chargementImage(int *width, int *height)
{
SDL_Surface * s = NULL;
s = IMG_Load("in.bmp");
unsigned char *surfaceMonochrome;
int i=0, j=0;
surfaceMonochrome = calloc(s->w * s->h, sizeof *surfaceMonochrome);
Uint8 r, g ,b;
if(s == NULL)
{
fprintf(stderr, "Erreur lors du chargement de l'image : in.bmp\n");
return NULL;
}
else
{
fprintf(stdout, "Chargement de l'image : in.bmp\n");
fprintf(stdout, "Largeur : %dpx\nHauteur : %dpx\n", s->w, s->h);
*width = s->w;
*height = s->h;
SDL_LockSurface(s);
for(i=0; i < s->w; i++)
{
for(j=0; j < s->h; j++)
{
SDL_GetRGB(getpixel(s, i, j), s->format, &r, &g, &b);
surfaceMonochrome[j * s->w + i] = (char)((r + g + b) / 3);
}
}
SDL_UnlockSurface(s);
return surfaceMonochrome;
}
}
// Une demande d'affichage vient d'être générée
void affichage(GLfloat *tabCouleur)
{
/* On efface l'écran avec la couleur du fond et le Z-Buffer */
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
int i=0;
unsigned int index[33*33];
for(i=0; i < 33*33; i++)
index[i] = i;
//Gestion de la camera
glLoadIdentity();
glRotatef(angleZ, 0, 1, 0);
glRotatef(angleX, 1, 0, 0);
glTranslatef(0, 0, Z);
gluLookAt (10.0, 10.0, 10.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0);
//Dessin du VBO
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glBindBuffer(GL_ARRAY_BUFFER, id);
glVertexPointer(3, GL_FLOAT, 0, BUFFER_OFFSET(0));
glColorPointer(3, GL_FLOAT, 0, tabCouleur);
glDrawElements(GL_TRIANGLE_STRIP, 33*33, GL_UNSIGNED_INT, index);
//glDrawArrays(GL_LINE_STRIP, 0, 33*33);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
}
//Gestion des événements clavier
void clavier()
{
SDL_Event event;
SDL_WaitEvent(&event);
switch(event.type)
{
case SDL_QUIT:
exit(1);
break;
case SDL_KEYDOWN:
switch(event.key.keysym.sym)
{
case SDLK_UP:
Z += 10;
break;
case SDLK_DOWN:
Z -= 10;
break;
case SDLK_LEFT:
angleZ -= 10;
break;
case SDLK_RIGHT:
angleZ += 10;
break;
case 'z':
angleX -= 10;
break;
case 's':
angleX += 10;
break;
case 'q':
exit(1);
break;
}
}
}
int main(int argc, char **argv)
{
int done=1;
SDL_Event event;
SDL_Surface* screen;
int widthImage, heightImage;
int newx, newy, tmpx,tmpy, curmx,curmy;
GLfloat rapport = ((float) (800))/ ((float) (600));
GLfloat *tabCouleur;
unsigned char *matrice;
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
printf("Unable to initialize SDL: %s\n", SDL_GetError());
return 1;
}
SDL_WM_SetCaption("Affichage du terrain",NULL);
screen = SDL_SetVideoMode(800, 600, 32, SDL_OPENGL);
if(screen==NULL)
return EXIT_FAILURE;
//Chargement de l'image
matrice = chargementImage(&widthImage, &heightImage);
//Création du tableau de couleur
tabCouleur = initCouleur(widthImage, heightImage, 0.0, 255.0, 0.0);
//Création du VBO
makeVBO(matrice, widthImage, heightImage);
glEnable(GL_DEPTH_TEST);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 16);
glViewport(0,0,800,600);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(40,rapport,1.0,100.0);
glMatrixMode(GL_MODELVIEW);
glClearColor(0.0,0.0,0.0,0.0);
while(done)
{
//Affichage
affichage(tabCouleur);
clavier();
SDL_GL_SwapBuffers();
}
/*Quitter*/
SDL_Quit();
return EXIT_SUCCESS;
} |
Probléme d'affichage d'un VBO
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