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/* pyramid.c
*
* @2011 Kamil Kaminski
*
* notes: since lighting is enabled, we need to specify normals for
* each polygon face so the OpenGL can calculate e.g. how light reflects
*
* drawing a shadow for the pyramid would require drawing things twice, so on 2nd
* pass we would draw with black color and multiply by squished matrix, we should
* get to this later with better approach
*
* so far we have been using immediate mode rendering, we should begin using
* display lists / batch processing to reduce overhead, aka compiling commands
*
* it might be time to split the code, and make a shader version...
*
*/
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include <GL/glew.h>
#include <GL/freeglut.h>
#include <sys/time.h>
#include "client.h"
#include "event.h"
#include "gldraw.h"
#include "glframe.h"
#include "gltools.h"
#include "math3d.h"
#include "platform.h"
#include "sdltools.h"
#include "window.h"
/* sane defaults, these are overwritable by config.lua */
int program_running = 1;
unsigned int xres_w = 640;
unsigned int yres_w = 480;
unsigned int bpp_w = 32;
unsigned int af_w = 8;
const char *window_caption = "Textured Pyramid";
const char *window_icon_path = "tux.png";
const unsigned int sdl_video_flags = SDL_OPENGL | SDL_RESIZABLE;
unsigned int maxfps_w = 60;
/* function prototypes */
static int client_init(struct client *);
static int client_destroy(struct client *);
static inline void process_events(void);
static void render(struct platform *);
static int client_init(struct client *p)
{
p->textures[0] = gltLoadTGATexture("stone.tga");
p->textures[1] = gltLoadTGATexture("grass.tga");
/* display list, precompile commands */
p->ground_list = glGenLists(2);
p->triangle_list = p->ground_list + 1;
/* a triangle with a texture */
glNewList(p->triangle_list, GL_COMPILE);
glBindTexture(GL_TEXTURE_2D, p->textures[0]);
/* glBindTexture(GL_TEXTURE_2D, p->textures[1]); */
glColor3f(1.0f, 1.0f, 1.0f);
glDrawTriangle();
glEndList();
/* a ground drawn using magneta lines */
glNewList(p->ground_list, GL_COMPILE);
glColor3ub(255, 0, 255);
glDrawGround();
glEndList();
return 0;
}
static int client_destroy(struct client *p)
{
glDeleteTextures(2, p->textures);
glDeleteLists(p->ground_list, 2);
return 0;
}
static inline void process_events(void)
{
sdl_process_events();
}
static void render(struct platform *p)
{
/* clear the window with current clearing color */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* save the matrix state and do the rotations */
glPushMatrix();
/* apply camera transform, and draw the ground */
glframe_apply_camera_transform(&p->camera, 1);
glCallList(p->c->ground_list);
glPushMatrix();
/* move object back and do in place rotation */
glTranslatef(0.0f, 0.2f, -3.5f);
glRotatef(p->c->xrot, 1.0f, 0.0f, 0.0f);
glRotatef(p->c->yrot, 0.0f, 1.0f, 0.0f);
/* draw the pyramid */
glCallList(p->c->triangle_list);
glPopMatrix();
/* draw a snowman */
glTranslatef(0.0f, 0.0f, -7.0f);
glDisable(GL_TEXTURE_2D);
glDrawSnowman();
glEnable(GL_TEXTURE_2D);
/* restore the matrix state */
glPopMatrix();
/* buffer swap */
SDL_GL_SwapBuffers();
}
int main(int argc, char **argv)
{
struct platform p;
memset(&p, 0, sizeof(p));
/* setup client platform */
struct client c;
memset(&c, 0, sizeof(c));
p.c = &c;
p.client_init = &client_init;
p.client_destroy = &client_destroy;
/* initialize host platform */
platform_init(&p);
gltErrorCheck();
gltOpenGLInfo();
unsigned int startclock;
while (program_running)
{
startclock = SDL_GetTicks();
process_events();
render(&p);
sdlFrameControl(startclock);
}
platform_destroy(&p);
puts("bye!");
return 0;
}
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