openvgfordummies/redonion/redonion.cpp

/**
  * Draws number of really large paths, created by rasterising a photograph
  * (using inkscape/potrace, svgconv)
  *
  */

#include "game.h"

// for readability, the screen and texture sizes are hard-coded
const float SCREEN_WIDTH=640.0f;
const float SCREEN_HEIGHT=360.0f;

const VGfloat backgroundColor[4] = { 0.9f, .83f, 0.76f, 1.0f };

// defines used by svgconv

typedef int HGint32;
typedef unsigned int HGuint32;

typedef short HGint16;
typedef unsigned short HGuint16;

typedef signed char HGint8;
typedef unsigned char HGuint8;

typedef int HGbool;

#define HG_FALSE (0 == 1)
#define HG_TRUE (1 == 1)

#define OVG_RGB(r,g,b) ((b<<8)|(g<<16)|(r<<24)|0xff)

typedef struct
{
    const float* floats;
    const HGuint8* cmds;
    HGint32 nCommands;
    HGint32 nFloats;
    HGuint32 color;
    float transform[9];
} PathData;

#include "redonion_svg.h"

#define NUM_PATHS (sizeof(_paths)/sizeof(PathData))

// runtime path handles
VGPath paths[NUM_PATHS];
VGPaint paint;

/** walltime */
float t;

void game_init()
{
}

void game_destroy()
{
}

void game_prepare()
{
    vgSeti(VG_RENDERING_QUALITY, VG_RENDERING_QUALITY_FASTER);

    paint = vgCreatePaint();
    vgSetPaint(paint, VG_FILL_PATH);
    vgSeti(VG_FILL_RULE, VG_NON_ZERO);

    for(int i=0;i<NUM_PATHS;i++)
    {
        paths[i] = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F, 1.0f, 0.0f, 0, 0, VG_PATH_CAPABILITY_APPEND_TO);
        vgAppendPathData(paths[i], _paths[i].nCommands, (VGubyte*)_paths[i].cmds, _paths[i].floats);
    }
}

void game_release()
{
    for(int i=0;i<NUM_PATHS;i++)
    {
        vgDestroyPath(paths[i]);
        paths[i]=VG_INVALID_HANDLE;
    }

    vgDestroyPaint(paint);
    paint=VG_INVALID_HANDLE;
}

void game_update(float walltime)
{
    t=walltime;
}

void game_render()
{
    // clear background using black
    vgSetfv(VG_CLEAR_COLOR, 4, backgroundColor);
    vgClear(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);

    vgSetPaint(paint, VG_FILL_PATH);
    for(int i = 0; i < NUM_PATHS; i++)
    {
        vgSetColor(paint, _paths[i].color);
        vgSeti(VG_MATRIX_MODE, VG_MATRIX_PATH_USER_TO_SURFACE);
        vgLoadIdentity();
        vgRotate(90);
        vgTranslate(-130*(1+sin(t*.2)),0);
        vgScale(1.0f, -1.0f);
        vgMultMatrix(_paths[i].transform);
        vgDrawPath(paths[i], VG_FILL_PATH);
    }

}

void game_event(int type, float x, float y, float z)
{
}