void init(float winwidth, float winheight, float pixratio)
{
printf(
"Spacebar to toggle texture modes.\n"
"D to toggle auto-zooming demo mode.\n"
"G to toggle the slippy map grid.\n");
parg_state_clearcolor((Vector4){0.43, 0.61, 0.8, 1});
parg_state_cullfaces(1);
parg_state_depthtest(0);
parg_shader_load_from_asset(SHADER_DEFAULT);
parg_zcam_init(1, 1, fovy);
parg_zcam_set_position(0, 0, STARTZ);
ocean_texture = parg_texture_from_asset(TEXTURE_OCEAN);
paper_texture = parg_texture_from_asset(TEXTURE_PAPER);
// Decode the europe image.
int* rawdata;
parg_buffer* colorbuf =
parg_buffer_slurp_asset(TEXTURE_EUROPE, (void*) &rawdata);
int width = *rawdata++;
int height = *rawdata++;
int ncomps = *rawdata++;
parg_texture_fliprows(rawdata, width * ncomps, height);
// Sample the ocean color from one corner of the image.
int ocean_color = rawdata[0];
// Perform marching squares and generate a mesh.
par_msquares_meshlist* mlist =
par_msquares_color((parg_byte*) rawdata, width, height, 16, ocean_color,
4, PAR_MSQUARES_SWIZZLE | PAR_MSQUARES_DUAL | PAR_MSQUARES_HEIGHTS |
PAR_MSQUARES_SIMPLIFY);
par_msquares_mesh const* mesh;
mesh = par_msquares_get_mesh(mlist, 0);
landmass_mesh = parg_mesh_create(
mesh->points, mesh->npoints, mesh->triangles, mesh->ntriangles);
mesh = par_msquares_get_mesh(mlist, 1);
ocean_mesh = parg_mesh_create(
mesh->points, mesh->npoints, mesh->triangles, mesh->ntriangles);
parg_buffer_unlock(colorbuf);
par_msquares_free(mlist);
}
static void create_mesh()
{
par_msquares_meshlist* mlist = 0;
float threshold = 0;
int flags = 0;
if (state == STATE_GRAY_DEFAULT) {
float const* graydata = parg_buffer_lock(graybuf, PARG_READ);
mlist = par_msquares_grayscale(
graydata, IMGWIDTH, IMGHEIGHT, CELLSIZE, threshold, flags);
parg_buffer_unlock(graybuf);
} else if (state == STATE_GRAY_SIMPLIFY) {
float const* graydata = parg_buffer_lock(graybuf, PARG_READ);
flags = PAR_MSQUARES_SIMPLIFY;
mlist = par_msquares_grayscale(
graydata, IMGWIDTH, IMGHEIGHT, CELLSIZE, threshold, flags);
parg_buffer_unlock(graybuf);
} else if (state == STATE_GRAY_INVERT) {
float const* graydata = parg_buffer_lock(graybuf, PARG_READ);
flags = PAR_MSQUARES_INVERT;
mlist = par_msquares_grayscale(
graydata, IMGWIDTH, IMGHEIGHT, CELLSIZE, threshold, flags);
parg_buffer_unlock(graybuf);
} else if (state == STATE_GRAY_DUAL) {
float const* graydata = parg_buffer_lock(graybuf, PARG_READ);
flags = PAR_MSQUARES_DUAL;
mlist = par_msquares_grayscale(
graydata, IMGWIDTH, IMGHEIGHT, CELLSIZE, threshold, flags);
parg_buffer_unlock(graybuf);
} else if (state == STATE_GRAY_HEIGHTS) {
float const* graydata = parg_buffer_lock(graybuf, PARG_READ);
flags = PAR_MSQUARES_HEIGHTS;
mlist = par_msquares_grayscale(
graydata, IMGWIDTH, IMGHEIGHT, CELLSIZE, threshold, flags);
parg_buffer_unlock(graybuf);
} else if (state == STATE_GRAY_DHS) {
float const* graydata = parg_buffer_lock(graybuf, PARG_READ);
flags = PAR_MSQUARES_DUAL | PAR_MSQUARES_HEIGHTS | PAR_MSQUARES_SNAP;
mlist = par_msquares_grayscale(
graydata, IMGWIDTH, IMGHEIGHT, CELLSIZE, threshold, flags);
parg_buffer_unlock(graybuf);
} else if (state == STATE_GRAY_DHSC) {
float const* graydata = parg_buffer_lock(graybuf, PARG_READ);
flags = PAR_MSQUARES_DUAL | PAR_MSQUARES_HEIGHTS | PAR_MSQUARES_SNAP |
PAR_MSQUARES_CONNECT;
mlist = par_msquares_grayscale(
graydata, IMGWIDTH, IMGHEIGHT, CELLSIZE, threshold, flags);
parg_buffer_unlock(graybuf);
} else if (state == STATE_GRAY_MULTI) {
float const* graydata = parg_buffer_lock(graybuf, PARG_READ);
float thresholds[] = {0.0, 0.1};
flags = PAR_MSQUARES_SIMPLIFY | PAR_MSQUARES_HEIGHTS |
PAR_MSQUARES_SNAP | PAR_MSQUARES_CONNECT;
mlist = par_msquares_grayscale_multi(
graydata, IMGWIDTH, IMGHEIGHT, CELLSIZE, thresholds, 2, flags);
parg_buffer_unlock(graybuf);
} else if (state == STATE_COLOR_DEFAULT) {
parg_byte const* rgbadata = parg_buffer_lock(colorbuf, PARG_READ);
rgbadata += sizeof(int) * 3;
mlist = par_msquares_color(
rgbadata, IMGWIDTH, IMGHEIGHT, CELLSIZE, 0x214562, 4, flags);
parg_buffer_unlock(colorbuf);
} else if (state == STATE_COLOR_IH) {
parg_byte const* rgbadata = parg_buffer_lock(colorbuf, PARG_READ);
rgbadata += sizeof(int) * 3;
flags = PAR_MSQUARES_INVERT | PAR_MSQUARES_HEIGHTS;
mlist = par_msquares_color(
rgbadata, IMGWIDTH, IMGHEIGHT, CELLSIZE, 0x214562, 4, flags);
parg_buffer_unlock(colorbuf);
} else if (state == STATE_COLOR_DHSCSI) {
parg_byte const* rgbadata = parg_buffer_lock(colorbuf, PARG_READ);
rgbadata += sizeof(int) * 3;
flags = PAR_MSQUARES_DUAL | PAR_MSQUARES_HEIGHTS | PAR_MSQUARES_SNAP |
PAR_MSQUARES_CONNECT | PAR_MSQUARES_SIMPLIFY |
PAR_MSQUARES_INVERT;
mlist = par_msquares_color(
rgbadata, IMGWIDTH, IMGHEIGHT, CELLSIZE, 0x214562, 4, flags);
parg_buffer_unlock(colorbuf);
} else if (state == STATE_MULTI_RGB) {
unsigned dims[2] = {0, 0};
unsigned char* pixels;
lodepng_decode_file(
&pixels, &dims[0], &dims[1], "extern/par/test/rgb.png", LCT_RGB, 8);
mlist = par_msquares_color_multi(
pixels, dims[0], dims[1], 16, 3, PAR_MSQUARES_SIMPLIFY);
free(pixels);
} else if (state == STATE_MULTI_RGBA) {
unsigned dims[2] = {0, 0};
unsigned char* pixels;
lodepng_decode_file(&pixels, &dims[0], &dims[1],
"extern/par/test/rgba.png", LCT_RGBA, 8);
mlist = par_msquares_color_multi(pixels, dims[0], dims[1], 16, 4,
PAR_MSQUARES_HEIGHTS | PAR_MSQUARES_CONNECT |
PAR_MSQUARES_SIMPLIFY);
free(pixels);
} else if (state == STATE_MULTI_DIAGRAM) {
parg_byte const* rgbadata = parg_buffer_lock(colorbuf, PARG_READ);
rgbadata += sizeof(int) * 3;
mlist = par_msquares_color_multi(rgbadata, IMGWIDTH, IMGHEIGHT,
CELLSIZE, 4, PAR_MSQUARES_SIMPLIFY | PAR_MSQUARES_HEIGHTS);
parg_buffer_unlock(colorbuf);
}
nmeshes = par_msquares_get_count(mlist);
printf("%d meshes\n", nmeshes);
for (int imesh = 0; imesh < nmeshes; imesh++) {
par_msquares_mesh const* mesh = par_msquares_get_mesh(mlist, imesh);
// mquares_mesh might have dimensionality of 2 or 3, while parg_mesh
// only
// supports the latter. So, we potentially need to expand the data from
// vec2 to vec3.
float* points = mesh->points;
if (mesh->dim == 2) {
points = malloc(mesh->npoints * sizeof(float) * 3);
for (int i = 0; i < mesh->npoints; i++) {
points[i * 3] = mesh->points[i * 2];
points[i * 3 + 1] = mesh->points[i * 2 + 1];
points[i * 3 + 2] = 0;
}
}
meshcolors[imesh] = mesh->color;
trimesh[imesh] = parg_mesh_create(
points, mesh->npoints, mesh->triangles, mesh->ntriangles);
if (mesh->dim == 2) {
free(points);
}
}
par_msquares_free(mlist);
}