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MEDVEDx64/terrain.c

Created February 21, 2016 17:56
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terrain.c
#include <stdio.h>
#include <stdint.h>
#include <SDL/SDL_image.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <mario/engine/timer.h>
#include <mario/engine/event.h>
#define SW 960
#define SH 480
/**
MEDVEDx64
2013-05-28
GPL
ACHTUNG! Опасно для моска.
**/
int init() {
if(SDL_Init(SDL_INIT_VIDEO)) return 1;
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
if(!SDL_SetVideoMode(SW,SH,0,SDL_OPENGL|SDL_OPENGLBLIT)) return 1;
SDL_WM_SetCaption("medvedish terrainview", NULL);
glShadeModel(GL_SMOOTH);
glClearColor(0,0,0,0);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
glViewport(0,0,SW,SH);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f,(GLfloat)SW/(GLfloat)SH, 0.1f,100.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
ev_Reset();
tim_SetFPSLimit(60);
glTranslatef(-5, -1, -5);
return 0;
}
void let_there_be_grid() {
glColor3f(1,0,0);
glBegin(GL_LINES);
glVertex3f(0,100.0f,0);
glVertex3f(0,-100.0f,0);
glEnd();
glColor3f(0,0,0.64f);
GLfloat i;
for(i = -100.0f; i < 100.1f; i++) {
glBegin(GL_LINES);
glVertex3f(-100.0f, -1, i);
glVertex3f(100.0f, -1, i);
glVertex3f(i, -1, -100.0f);
glVertex3f(i, -1, 100.0f);
glEnd();
}
}
#define SPEED_F 0.364f
#define R_SPEED_F 0.064f
#define R_ANGLE_F 2.5f
void ev_loop() {
ev_Query();
if(ev_GetKeyState(SDLK_w) == K_PRESSED) glTranslatef(0,0, SPEED_F);
if(ev_GetKeyState(SDLK_s) == K_PRESSED) glTranslatef(0,0, -SPEED_F);
if(ev_GetKeyState(SDLK_a) == K_PRESSED) glTranslatef(SPEED_F,0,0);
if(ev_GetKeyState(SDLK_d) == K_PRESSED) glTranslatef(-SPEED_F,0,0);
if(ev_GetKeyState(SDLK_q) == K_PRESSED) glTranslatef(0,-SPEED_F,0);
if(ev_GetKeyState(SDLK_e) == K_PRESSED) glTranslatef(0,SPEED_F,0);
if(ev_GetKeyState(SDLK_LEFT) == K_PRESSED) glRotatef(R_ANGLE_F, 0, -R_SPEED_F, 0);
if(ev_GetKeyState(SDLK_RIGHT) == K_PRESSED) glRotatef(R_ANGLE_F, 0, R_SPEED_F, 0);
if(ev_GetKeyState(SDLK_UP) == K_PRESSED) glRotatef(R_ANGLE_F, -R_SPEED_F, 0, 0);
if(ev_GetKeyState(SDLK_DOWN) == K_PRESSED) glRotatef(R_ANGLE_F, R_SPEED_F, 0, 0);
if(ev_CaughtQuitSignal()) exit(0);
}
char *argv_2__ = NULL;
#define HEIGHT_MUL (GLfloat)(atoi(argv_2__))*0.001
uint8_t *pixels__ = NULL;
uint8_t *pixels_r__ = NULL;
uint8_t *pixels_g__ = NULL;
uint8_t *pixels_b__ = NULL;
uint16_t w__,h__;
void render_terrain(uint8_t *pixels, uint16_t w, uint16_t h)
{
glColor4f(0,0.78f,0,1);
register uint16_t x,z;
for(x = 2; x < w-2; ++x){
for(z = 2; z < h-2; ++z){
glBegin(GL_TRIANGLES);
glColor3f(pixels_r__? (GLfloat)pixels_r__[(z*w+x)]/256.0f: 0,
pixels_g__? (GLfloat)pixels_g__[(z*w+x)]/256.0f:
((GLfloat)pixels[(z*w+x)])/256.0f,
pixels_b__? (GLfloat)pixels_b__[(z*w+x)]/256.0f: 0);
glVertex3f((GLfloat)x, ((GLfloat)pixels[(z*w+x)])*HEIGHT_MUL, (GLfloat)z);
glColor3f(pixels_r__? (GLfloat)pixels_r__[z*w+(x+1)]/256.0f: 0,
pixels_g__? (GLfloat)pixels_g__[z*w+(x+1)]/256.0f:
((GLfloat)pixels[z*w+(x+1)])/256.0f,
pixels_b__? (GLfloat)pixels_b__[z*w+(x+1)]/256.0f: 0);
glVertex3f((GLfloat)x+1, ((GLfloat)pixels[z*w+(x+1)])*HEIGHT_MUL, (GLfloat)z);
glColor3f(pixels_r__? (GLfloat)pixels_r__[(z+1)*w+x]/256.0f: 0,
pixels_g__? (GLfloat)pixels_g__[(z+1)*w+x]/256.0f:
((GLfloat)pixels[(z+1)*w+x])/256.0f,
pixels_b__? (GLfloat)pixels_b__[(z+1)*w+x]/256.0f: 0);
glVertex3f((GLfloat)x, ((GLfloat)pixels[(z+1)*w+x])*HEIGHT_MUL, (GLfloat)z+1);
glColor3f(pixels_r__? (GLfloat)pixels_r__[(z+1)*w+x]/256.0f: 0,
pixels_g__? (GLfloat)pixels_g__[(z+1)*w+x]/256.0f:
((GLfloat)pixels[(z+1)*w+x])/256.0f,
pixels_b__? (GLfloat)pixels_b__[(z+1)*w+x]/256.0f: 0);
glVertex3f((GLfloat)x, ((GLfloat)pixels[(z+1)*w+x])*HEIGHT_MUL, (GLfloat)z+1);
glColor3f(pixels_r__? (GLfloat)pixels_r__[z*w+(x+1)]/256.0f: 0,
pixels_g__? (GLfloat)pixels_g__[z*w+(x+1)]/256.0f:
((GLfloat)pixels[z*w+(x+1)])/256.0f,
pixels_b__? (GLfloat)pixels_b__[z*w+(x+1)]/256.0f: 0);
glVertex3f((GLfloat)x+1, ((GLfloat)pixels[z*w+(x+1)])*HEIGHT_MUL, (GLfloat)z);
glColor3f(pixels_r__? (GLfloat)pixels_r__[(z+1)*w+(x+1)]/256.0f: 0,
pixels_g__? (GLfloat)pixels_g__[(z+1)*w+(x+1)]/256.0f:
((GLfloat)pixels[(z+1)*w+(x+1)])/256.0f,
pixels_b__? (GLfloat)pixels_b__[(z+1)*w+(x+1)]/256.0f: 0);
glVertex3f((GLfloat)x+1, ((GLfloat)pixels[(z+1)*w+(x+1)])*HEIGHT_MUL, (GLfloat)z+1);
glEnd();
}
}
#undef X
#undef Z
}
void draw() {
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
let_there_be_grid();
render_terrain(pixels__, w__, h__);
SDL_GL_SwapBuffers();
}
int main(int argc, char *argv[])
{
if(argc < 3) return 0;
printf("terrainview\n");
argv_2__ = argv[2];
if(init()) {
printf("init() has crashed.\n");
return 1;
}
SDL_Surface *img = IMG_Load(argv[1]);
if(img == NULL)
{
printf("img_load() fail.\n");
return 1;
}
w__ = img->w;
h__ = img->h;
if(img->format->BytesPerPixel == 1)
pixels__ = img->pixels;
else if(img->format->BytesPerPixel == 3) {
Uint8 *pix = img->pixels;
pixels__ = malloc(w__*h__);
pixels_r__ = malloc(w__*h__);
pixels_g__ = malloc(w__*h__);
pixels_b__ = malloc(w__*h__);
register int i;
for(i = 0; i < w__*h__; ++i) {
pixels__[i] = (pix[i*3]+pix[i*3+1]+pix[i*3+2])/3;
pixels_r__[i] = pix[i*3];
pixels_g__[i] = pix[i*3+1];
pixels_b__[i] = pix[i*3+2];
}
}
else if(img->format->BytesPerPixel == 4) {
Uint8 *pix = img->pixels;
pixels__ = malloc(w__*h__);
pixels_r__ = malloc(w__*h__);
pixels_g__ = malloc(w__*h__);
pixels_b__ = malloc(w__*h__);
register int i;
for(i = 0; i < w__*h__; ++i)
{
pixels__[i] = (pix[i*4]+pix[i*4+1]+pix[i*4+2])/3;
pixels_r__[i] = pix[i*4];
pixels_g__[i] = pix[i*4+1];
pixels_b__[i] = pix[i*4+2];
}
}
while(1) {
tim_fps_control();
ev_loop();
draw();
}
return 0;
}
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