spieleprogrammierer.de - Forum und Wiki zur Spieleprogrammierung und Spieleentwicklung

Quellcode

int width, height, tex;
unsigned char* image;



     int loadTexture(char* fileName)
       {
        SDL_Surface *image=IMG_Load(fileName);
        //SDL_DisplayFormatAlpha(image);
        GLuint object;
        glGenTextures(1,&object);
        glBindTexture(GL_TEXTURE_2D,object);
        glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
        glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
        glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_EDGE);
        glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP_TO_EDGE);
        glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,image->w,image ->h,0,GL_RGBA,GL_UNSIGNED_BYTE,image->pixels);
        SDL_FreeSurface(image);
        return object;
    }


void initor()
{
        glClearColor(0.0,0.0,0.0,0.0);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glOrthof(0.0,800,600,1.0,-1.0,1.0);
        glEnable(GL_BLEND);
        glEnable(GL_TEXTURE_2D);
        glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
        tex = loadTexture("hi.png");
  }


void Draw(int x, int y, Image* texture, bool blendFlag) {
{
//Bind Texture
glBindTexture(GL_TEXTURE_2D, texture->getData());

if (blendFlag)
{
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}

GLfloat Vertices[] = {(float)x, (float)y, 0,
                    (float)x + texture->getWidth(), (float)y, 0,
                    (float)x + (float)texture->getWidth(), (float)y + (float)texture->getHeight(), 0,
                    (float)x, (float)y + (float)texture->getHeight(), 0};
                    
GLfloat TexCoord[] = {0, 0,
    1, 0,
    1, 1,
    0, 1,
};
GLubyte indices[] = {0,1,2, // first triangle (bottom left - top left - top right)
                     0,2,3}; // second triangle (bottom left - top right - bottom right)

glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, Vertices);

glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, TexCoord);

glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, indices);

glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);

if (blendFlag)  glDisable(GL_BLEND);
}
....

static void Cube
{
...
}


static void Render()
{

  Cube()
  Draw(10,10, ? ,blendFlag);  // so?

}

.... // ganz viel Code  und initor(); später in main

Quellcode

 SDL_Surface *Image=IMG_Load("hi.bmp");
//typedef Image;

void Draw(int x, int y,/* Image* texture */ bool blendFlag) 
{
//Bind Texture
GLuint texture= 1;

glGenTextures(1, &texture);

glBindTexture(GL_TEXTURE_2D, texture);
...

C-/C++-Quelltext

 SDL_Surface *Image=IMG_Load("hi.bmp");

void Draw(int x, int y,Image* texture, bool blendFlag) 
{
//Bind Texture
glBindTexture(GL_TEXTURE_2D,texture->getData());

C-/C++-Quelltext

//*********************************
//*        SDL2 - OpenGL ES 1.1 
//*  Android Crossplattform Bridge  for 2D and 3D 
//*    micoAndro3D Engine alpha
//***********************************
// 
//        work in process........
//
//***********************************

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

#include "SDL2/SDL.h"
#include "SDL_test_common.h"

#include "SDL_opengles.h"
#include "SDL_image.h"

static SDLTest_CommonState *state;
static SDL_GLContext *context = NULL;
static int depth = 16;



/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void quit(int rc)
{
    int i;

    if (context != NULL) {
        for (i = 0; i < state->num_windows; i++) {
            if (context[i]) {
                SDL_GL_DeleteContext(context[i]);
            }
        }

        SDL_free(context);
    }

    SDLTest_CommonQuit(state);
    exit(rc);
}

//‐---------------------------------------------------------------------------------------------
//  SDL2 Image_ loader for OpenGL ES
//
//   use in main()  -  myglu=LoadTexture("example.bmp",&textw,&texth);
//    use in render() - draw(x,y,myglu,32,32 )   // image size
//-----------------------------------‐-------------------------------------------------------------


    GLuint myglu;
  int textw,texth;


bool blendFlag;
GLuint textureid = 0;
 

GLuint LoadTexture(char *filename,int *textw,int *texth) {

        SDL_Surface *surface;
        GLuint textureid;
        int mode;

        surface = IMG_Load(filename);

        // Or if you don't use SDL_image you can use SDL_LoadBMP here instead:
        // surface = SDL_LoadBMP(filename);

        // could not load filename
        if (!surface) {

                return 0;

        }

        // work out what format to tell glTexImage2D to use...
        if (surface->format->BytesPerPixel == 3) { // RGB 24bit

                mode = GL_RGB;

        } else if (surface->format->BytesPerPixel == 4) { // RGBA 32bit

                mode = GL_RGBA;

        } else {

                SDL_FreeSurface(surface);
                return 0;

        }

         *textw=surface->w;
         *texth=surface->h;
        // create one texture name
        glGenTextures(1, &textureid);

        // tell opengl to use the generated texture name
        glBindTexture(GL_TEXTURE_2D, textureid);

        // this reads from the sdl surface and puts it into an opengl texture
        glTexImage2D(GL_TEXTURE_2D, 0, mode, surface->w, surface->h, 0, mode, GL_UNSIGNED_BYTE, surface->pixels);

        // these affect how this texture is drawn later on...
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);

        // clean up
        SDL_FreeSurface(surface);

        return textureid;
}

//---------------------------------



void Draw(int x, int y, GLuint textureid, int textw,int texth)

{
    
    glBindTexture(GL_TEXTURE_2D, textureid);
    glEnable(GL_TEXTURE_2D);

if (blendFlag)
{
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}

GLfloat Vertices[] = {
    (float)x, (float)y, 0,
    (float)x + -1, (float)y, 0,
     (float)x + (float)-1,
     (float)y +  (float)-1, 0,
     (float)x,(float)y + 
     (float)-1, 0};

                    
GLfloat TexCoord[] = {0, 0,
    1, 0,
    1, 1,
    0, 1,
};

GLubyte indices[] = {0,1,2, // first triangle (bottom left - top left - top right)
                     0,2,3}; // second triangle (bottom left - top right - bottom right)
 
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, Vertices);

glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, TexCoord);

glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, indices);

glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);

if (blendFlag)  glDisable(GL_BLEND);

glDisable(GL_TEXTURE_2D );
}



// -----------------------------------
// -----------------------------------



static void Cube()
{
    // Cube 
    // Bunte Farbe //in alle diemension
    static GLubyte color[8][4] = { {255, 0, 0, 0},
    {255, 0, 0, 255},
    {0, 255, 0, 255},
    {0, 255, 0, 255},
    {0, 255, 0, 255},
    {255, 255, 255, 255},
    {255, 0, 255, 255},
    {0, 0, 255, 255}
    };
   
    static GLfloat cube[8][3] = { {0.5, 0.5, -0.5},
    {0.5f, -0.5f, -0.5f},
    {-0.5f, -0.5f, -0.5f},
    {-0.5f, 0.5f, -0.5f},
    {-0.5f, 0.5f, 0.5f},
    {0.5f, 0.5f, 0.5f},
    {0.5f, -0.5f, 0.5f},
    {-0.5f, -0.5f, 0.5f}
    };
    
  //ecktpunkte zum verbinden zu alle seiten hin
    static GLubyte indices[36] = { 0, 3, 4,
        4, 5, 0,
        0, 5, 6,
        6, 1, 0,
        6, 7, 2,
        2, 1, 6,
        7, 4, 3,
        3, 2, 7,
        5, 4, 7,
        7, 6, 5,
        2, 3, 1,
        3, 0, 1
    };


    /* Draw the cube in */ 
     glColorPointer(4, GL_UNSIGNED_BYTE, 0, color);
     glEnableClientState(GL_COLOR_ARRAY);

    glVertexPointer(3, GL_FLOAT, 0, cube);
    glEnableClientState(GL_VERTEX_ARRAY);
    
    glDrawElements(GL_TRIANGLES, 36,   
    GL_UNSIGNED_BYTE, indices);

   glMatrixMode(GL_MODELVIEW);
}


static void Render()
{
   // Render aufraümen 
 glClearColor(0.0, 0.0, 0.0, 1.0);
 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

//  hier rendern //
 Draw(1,1,myglu,32,32);
 Draw(0,4,myglu,32,32);
 
 // "stelle alles da"*
 glMatrixMode(GL_MODELVIEW);
}



/// ------------------------------

// this is new 2020 stuff from code example in 
// c4droid. its free to iuse - well it works 
// okey we dont need it now,  ony for inits();.
// be carefully if you changeing

int main(int argc, char *argv[])
{
    //für framework 
    int fsaa, accel; 
    int value;
    int i, done;
    
    SDL_DisplayMode mode;
    SDL_Event event;
    Uint32 then, now, frames;
    int status;

    /* Initialize parameters */
    fsaa = 0;
    accel = 0;

    /* Initialize test framework */
    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
    if (!state) {
        return 1;
    }
    for (i = 1; i < argc;) {
        int consumed;

        consumed = SDLTest_CommonArg(state, i);
        if (consumed == 0) {
            if (SDL_strcasecmp(argv[i], "--fsaa") == 0) {
                ++fsaa;
                consumed = 1;
            } else if (SDL_strcasecmp(argv[i], "--accel") == 0) {
                ++accel;
                consumed = 1;
            } else if (SDL_strcasecmp(argv[i], "--zdepth") == 0) {
                i++;
                if (!argv[i]) {
                    consumed = -1;
                } else {
                    depth = SDL_atoi(argv[i]);
                    consumed = 1;
                }
            } else {
                consumed = -1;
            }
        }
        if (consumed < 0) {
            fprintf(stderr, "Usage: %s %s [--fsaa] [--accel] [--zdepth %%d]\n", argv[0],
                    SDLTest_CommonUsage(state));
            quit(1);
        }
        i += consumed;
    }

    /* Set OpenGL parameters */
    state->window_flags |= SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_BORDERLESS;
    
    // We are using 888 instead of 555 due to a bug that happens on OnePlus 6
    // With "Disable HW overlays" option off colors become weird
    // This is not fixed in the dev version of SDL2 at the time of writing (08/08/2018)
    state->gl_red_size = 8;
    state->gl_green_size = 8;
    state->gl_blue_size = 8;
    state->gl_depth_size = depth;
    
    if (fsaa) {
        state->gl_multisamplebuffers=1;
        state->gl_multisamplesamples=fsaa;
    }
    if (accel) {
        state->gl_accelerated=1;
    }
    if (!SDLTest_CommonInit(state)) {
        quit(2);
    }

    context = (void**) SDL_calloc(state->num_windows, sizeof(context));
    if (context == NULL) {
        fprintf(stderr, "Out of memory!\n");
        quit(2);
    }
    
    /* We want to use OpenGL ES 1, required for SDL 2.0.1 */
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 1);

    /* Create OpenGL ES contexts */
    for (i = 0; i < state->num_windows; i++) {
        context[i] = SDL_GL_CreateContext(state->windows[i]);
        if (!context[i]) {
            fprintf(stderr, "SDL_GL_CreateContext(): %s\n", SDL_GetError());
            quit(2);
        }
    }

    if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) {
        SDL_GL_SetSwapInterval(1);
    } else {
        SDL_GL_SetSwapInterval(0);
    }
    
    

  myglu=LoadTexture("hi.bmp",&textw,&texth);
//  DrawTexture(100,100,myglu,&testw,&texth);
  
  

    SDL_GetCurrentDisplayMode(0, &mode);
    SDL_BITSPERPIXEL(mode.format);
   

    status = SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value);
 
    status = SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &value);
    status = SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &value);
    status = SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &value);
   
    if (fsaa) {
        status = SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value);
        status = SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &value);    
    }
    
    if (accel) {
        status = SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &value);
    }

    /* Set rendering settings for each context */
    for (i = 0; i < state->num_windows; ++i) {
        float aspectAdjust;

        status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
        if (status) {
            printf("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());

            /* Continue for next window */
            continue;
        }
        //Android workaround
        state->window_w=mode.w;
        state->window_h=mode.h;
         
         //window screen and "camera"
        aspectAdjust = (4.0f / 3.0f) / ((float)state->window_w / state->window_h);
        glViewport(0, 0, state->window_w, state->window_h);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glOrthof(-2.0, 2.0, -2.0 * aspectAdjust, 2.0 * aspectAdjust, -20.0, 20.0);
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        glEnable(GL_DEPTH_TEST);
        glDepthFunc(GL_LESS);
        glShadeModel(GL_SMOOTH);
    }

    /* Main render loop */
    frames = 0;
    then = SDL_GetTicks();
    done = 0;
    while (!done) {
        /* Check for events */
        ++frames;
        while (SDL_PollEvent(&event)) {
            switch (event.type) {
            case SDL_WINDOWEVENT:
                switch (event.window.event) {
                    case SDL_WINDOWEVENT_RESIZED:
                        for (i = 0; i < state->num_windows; ++i) {
                            if (event.window.windowID == SDL_GetWindowID(state->windows[i])) {
                                status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
                                if (status) {
                                    printf("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
                                    break;
                                }
                                /* Change view port to the new window dimensions */
                                glViewport(0, 0, event.window.data1, event.window.data2);
                                /* Update window content */
                                Render();
                                SDL_GL_SwapWindow(state->windows[i]);
                                break;
                            }
                        }
                        break;
                }
            }
            SDLTest_CommonEvent(state, &event, &done);
        }
        for (i = 0; i < state->num_windows; ++i) {
            status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
            if (status) {
                printf("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());

                /* Continue for next window */
                continue;
            }
            Render();
            SDL_GL_SwapWindow(state->windows[i]);
        }
    }

    /* Print out some timing information */
    now = SDL_GetTicks();
    if (now > then) {
        printf("%2.2f frames per second\n",
               ((double) frames * 1000) / (now - then));
    }
    quit(0);
    return 0;
}

C-/C++-Quelltext

    float angle = 1.0f;

static void Render()
{
        angle += 1.0f;
   // Render aufraümen 
 glClearColor(0.0, 0.0, 0.0, 1.0);
 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

//  hier rendern //

 Draw(1,1,myglu,32,32);
 Draw(0,4,myglu,32,32);
 
 // "stelle alles da"*
 glMatrixMode(GL_MODELVIEW);
 glLoadIdentity();
 
    //int done_render = 0;
//    while (!done_render) 
 //   {
 glPushMatrix();
 glRotatef(angle, 1, 1, 0);
 Cube();
 glPopMatrix();

//    }
}