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4coder/4ed_system_shared.cpp

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/*
* Mr. 4th Dimention - Allen Webster
*
* 09.02.2016
*
* Shared system functions
*
*/
// TOP
#if !defined(FCODER_SYSTEM_SHARED_CPP)
#define FCODER_SYSTEM_SHARED_CPP
//
// Standard implementation of file system stuff based on the file track layer.
//
internal void
init_shared_vars(){
umem scratch_size = KB(128);
void *scratch_memory = system_memory_allocate(scratch_size);
shared_vars.scratch = make_part(scratch_memory, (i32)scratch_size);
shared_vars.track_table_size = KB(16);
shared_vars.track_table = system_memory_allocate(shared_vars.track_table_size);
shared_vars.track_node_size = KB(16);
void *track_nodes = system_memory_allocate(shared_vars.track_node_size);
i32 track_result = init_track_system(&shared_vars.track, &shared_vars.scratch, shared_vars.track_table, shared_vars.track_table_size, track_nodes, shared_vars.track_node_size);
if (track_result != FileTrack_Good){
exit(1);
}
}
internal b32
handle_track_out_of_memory(i32 val){
b32 result = 0;
switch (val){
case FileTrack_OutOfTableMemory:
{
u32 new_table_size = shared_vars.track_table_size*2;
void *new_table = system_memory_allocate(new_table_size);
move_track_system(&shared_vars.track, &shared_vars.scratch, new_table, new_table_size);
system_memory_free(shared_vars.track_table, shared_vars.track_table_size);
shared_vars.track_table_size = new_table_size;
shared_vars.track_table = new_table;
}break;
case FileTrack_OutOfListenerMemory:
{
shared_vars.track_node_size *= 2;
void *node_expansion = system_memory_allocate(shared_vars.track_node_size);
expand_track_system_listeners(&shared_vars.track, &shared_vars.scratch, node_expansion, shared_vars.track_node_size);
}break;
default: result = 1; break;
}
return(result);
}
internal
Sys_Add_Listener_Sig(system_add_listener){
b32 result = false;
for (;;){
i32 track_result = add_listener(&shared_vars.track, &shared_vars.scratch, (u8*)filename);
if (handle_track_out_of_memory(track_result)){
if (track_result == FileTrack_Good){
result = true;
}
break;
}
}
return(result);
}
internal
Sys_Remove_Listener_Sig(system_remove_listener){
b32 result = false;
i32 track_result = remove_listener(&shared_vars.track, &shared_vars.scratch, (u8*)filename);
if (track_result == FileTrack_Good){
result = true;
}
return(result);
}
internal
Sys_Get_File_Change_Sig(system_get_file_change){
b32 result = false;
i32 size = 0;
i32 get_result = get_change_event(&shared_vars.track, &shared_vars.scratch, (u8*)buffer, max, &size);
*required_size = size;
*mem_too_small = false;
if (get_result == FileTrack_Good){
result = true;
}
else if (get_result == FileTrack_MemoryTooSmall){
*mem_too_small = true;
result = true;
}
return(result);
}
//
// General shared pieces
//
internal File_Data
sysshared_load_file(char *filename){
File_Data result = {0};
Plat_Handle handle = {0};
if (system_load_handle(filename, &handle)){
u32 size = system_load_size(handle);
result.got_file = 1;
if (size > 0){
result.size = size;
result.data = (char*)system_memory_allocate(size+1);
if (!result.data){
result = null_file_data;
}
else{
if (!system_load_file(handle, result.data, size)){
system_memory_free(result.data, size+1);
result = null_file_data;
}
}
}
system_load_close(handle);
}
return(result);
}
internal b32
usable_ascii(char c){
b32 result = true;
if ((c < ' ' || c > '~') && c != '\n' && c != '\r' && c != '\t'){
result = false;
}
return(result);
}
internal void
sysshared_filter_real_files(char **files, i32 *file_count){
i32 end = *file_count;
i32 i = 0, j = 0;
for (; i < end; ++i){
if (system_file_can_be_made((u8*)files[i])){
files[j] = files[i];
++j;
}
}
*file_count = j;
}
internal Partition
sysshared_scratch_partition(i32 size){
void *data = system_memory_allocate((umem)size);
Partition part = make_part(data, size);
return(part);
}
internal void
sysshared_partition_grow(Partition *part, i32 new_size){
void *data = 0;
if (new_size > part->max){
// TODO(allen): attempt to grow in place by just acquiring next vpages?!
data = system_memory_allocate((umem)new_size);
memcpy(data, part->base, part->pos);
system_memory_free(part->base, part->max);
part->base = (char*)data;
part->max = new_size;
}
}
internal void
sysshared_partition_double(Partition *part){
sysshared_partition_grow(part, part->max*2);
}
internal void*
sysshared_push_block(Partition *part, i32 size){
void *result = 0;
result = push_block(part, size);
if (!result){
sysshared_partition_grow(part, size+part->max);
result = push_block(part, size);
}
return(result);
}
internal b32
sysshared_to_binary_path(String *out_filename, char *filename){
b32 translate_success = 0;
i32 max = out_filename->memory_size;
i32 size = system_get_binary_path(out_filename);
if (size > 0 && size < max-1){
out_filename->size = size;
if (append_sc(out_filename, filename) && terminate_with_null(out_filename)){
translate_success = 1;
}
}
return(translate_success);
}
//
// Rendering
//
inline void
draw_set_clip(Render_Target *target, i32_Rect clip_box){
glScissor(clip_box.x0, target->height - clip_box.y1, clip_box.x1 - clip_box.x0, clip_box.y1 - clip_box.y0);
}
inline void
draw_bind_texture(Render_Target *target, i32 texid){
if (target->bound_texture != texid){
glBindTexture(GL_TEXTURE_2D, texid);
target->bound_texture = texid;
}
}
inline void
draw_set_color(Render_Target *target, u32 color){
if (target->color != color){
target->color = color;
Vec4 c = unpack_color4(color);
glColor4f(c.r, c.g, c.b, c.a);
}
}
inline void
draw_safe_push(Render_Target *target, i32 size, void *x){
if (size + target->size <= target->max){
memcpy(target->push_buffer + target->size, x, size);
target->size += size;
}
}
#define PutStruct(s,x) draw_safe_push(target, sizeof(s), &x)
internal void
draw_push_piece(Render_Target *target, Render_Piece_Combined piece){
if (!target->clip_all){
PutStruct(Render_Piece_Header, piece.header);
switch (piece.header.type){
case piece_type_rectangle: case piece_type_outline:
{
PutStruct(Render_Piece_Rectangle, piece.rectangle);
}break;
case piece_type_gradient:
{
PutStruct(Render_Piece_Gradient, piece.gradient);
}break;
case piece_type_glyph: case piece_type_mono_glyph:
{
PutStruct(Render_Piece_Glyph, piece.glyph);
}break;
case piece_type_mono_glyph_advance:
{
PutStruct(Render_Piece_Glyph_Advance, piece.glyph_advance);
}break;
}
Assert(target->size <= target->max);
}
}
internal void
draw_push_piece_clip(Render_Target *target, i32_Rect clip_box){
if (!target->clip_all){
// TODO(allen): optimize out if there are two clip box changes in a row
Render_Piece_Change_Clip clip;
Render_Piece_Header header;
header.type = piece_type_change_clip;
clip.box = clip_box;
PutStruct(Render_Piece_Header, header);
PutStruct(Render_Piece_Change_Clip, clip);
}
}
internal void
draw_push_clip(Render_Target *target, i32_Rect clip_box){
Assert(target->clip_top == -1 || fits_inside(clip_box, target->clip_boxes[target->clip_top]));
Assert(target->clip_top+1 < ArrayCount(target->clip_boxes));
target->clip_boxes[++target->clip_top] = clip_box;
target->clip_all = (clip_box.x0 >= clip_box.x1 || clip_box.y0 >= clip_box.y1);
draw_push_piece_clip(target, clip_box);
}
internal i32_Rect
draw_pop_clip(Render_Target *target){
Assert(target->clip_top > 0);
i32_Rect result = target->clip_boxes[target->clip_top];
--target->clip_top;
i32_Rect clip_box = target->clip_boxes[target->clip_top];
target->clip_all = (clip_box.x0 >= clip_box.x1 || clip_box.y0 >= clip_box.y1);
draw_push_piece_clip(target, clip_box);
return(result);
}
#define ExtractStruct(s) ((s*)cursor); cursor += sizeof(s)
inline void
private_draw_rectangle(Render_Target *target, f32_Rect rect, u32 color){
draw_set_color(target, color);
draw_bind_texture(target, 0);
glBegin(GL_QUADS);
{
glVertex2f(rect.x0, rect.y0);
glVertex2f(rect.x0, rect.y1);
glVertex2f(rect.x1, rect.y1);
glVertex2f(rect.x1, rect.y0);
}
glEnd();
}
inline void
private_draw_rectangle_outline(Render_Target *target, f32_Rect rect, u32 color){
f32_Rect r = get_inner_rect(rect, .5f);
draw_set_color(target, color);
draw_bind_texture(target, 0);
glBegin(GL_LINE_STRIP);
{
glVertex2f(r.x0, r.y0);
glVertex2f(r.x1, r.y0);
glVertex2f(r.x1, r.y1);
glVertex2f(r.x0, r.y1);
glVertex2f(r.x0, r.y0);
}
glEnd();
}
inline void
private_draw_gradient(Render_Target *target, f32_Rect rect, Vec4 color_left, Vec4 color_right){
Vec4 cl = color_left;
Vec4 cr = color_right;
draw_bind_texture(target, 0);
glBegin(GL_QUADS);
{
glColor4f(cl.r, cl.g, cl.b, cl.a);
glVertex2f(rect.x0, rect.y0);
glVertex2f(rect.x0, rect.y1);
glColor4f(cr.r, cr.g, cr.b, cr.a);
glVertex2f(rect.x1, rect.y1);
glVertex2f(rect.x1, rect.y0);
}
glEnd();
}
struct Render_Quad{
f32 x0, y0, x1, y1;
f32 s0, t0, s1, t1;
};
inline Render_Quad
get_render_quad(Glyph_Bounds *b, i32 pw, i32 ph, float xpos, float ypos){
Render_Quad q;
float ipw = 1.0f / pw, iph = 1.0f / ph;
q.x0 = xpos + b->xoff;
q.y0 = ypos + b->yoff;
q.x1 = xpos + b->xoff2;
q.y1 = ypos + b->yoff2;
q.s0 = b->x0 * ipw;
q.t0 = b->y0 * iph;
q.s1 = b->x1 * ipw;
q.t1 = b->y1 * iph;
return(q);
}
inline Render_Quad
get_exact_render_quad(Glyph_Bounds *b, i32 pw, i32 ph, float xpos, float ypos){
Render_Quad q;
float ipw = 1.0f / pw, iph = 1.0f / ph;
q.x0 = xpos;
q.y0 = ypos + b->yoff;
q.x1 = xpos + (b->xoff2 - b->xoff);
q.y1 = ypos + b->yoff2;
q.s0 = b->x0 * ipw;
q.t0 = b->y0 * iph;
q.s1 = b->x1 * ipw;
q.t1 = b->y1 * iph;
return(q);
}
inline void
private_draw_glyph(System_Functions *system, Render_Target *target, Render_Font *font, u32 codepoint, f32 x, f32 y, u32 color){
Glyph_Data glyph = font_get_glyph(system, font, codepoint);
if (glyph.tex != 0){
Render_Quad q = get_render_quad(&glyph.bounds, glyph.tex_width, glyph.tex_height, x, y);
draw_set_color(target, color);
draw_bind_texture(target, glyph.tex);
glBegin(GL_QUADS);
{
glTexCoord2f(q.s0, q.t1); glVertex2f(q.x0, q.y1);
glTexCoord2f(q.s1, q.t1); glVertex2f(q.x1, q.y1);
glTexCoord2f(q.s1, q.t0); glVertex2f(q.x1, q.y0);
glTexCoord2f(q.s0, q.t0); glVertex2f(q.x0, q.y0);
}
glEnd();
}
}
inline void
private_draw_glyph_mono(System_Functions *system, Render_Target *target, Render_Font *font, u32 codepoint, f32 x, f32 y, f32 advance, u32 color){
Glyph_Data glyph = font_get_glyph(system, font, codepoint);
if (glyph.tex != 0){
f32 left = glyph.bounds.x0;
f32 right = glyph.bounds.x1;
f32 width = (right - left);
f32 x_shift = (advance - width) * .5f;
x += x_shift;
Render_Quad q = get_exact_render_quad(&glyph.bounds, glyph.tex_width, glyph.tex_height, x, y);
draw_set_color(target, color);
draw_bind_texture(target, glyph.tex);
glBegin(GL_QUADS);
{
glTexCoord2f(q.s0, q.t1); glVertex2f(q.x0, q.y1);
glTexCoord2f(q.s1, q.t1); glVertex2f(q.x1, q.y1);
glTexCoord2f(q.s1, q.t0); glVertex2f(q.x1, q.y0);
glTexCoord2f(q.s0, q.t0); glVertex2f(q.x0, q.y0);
}
glEnd();
}
}
inline void
private_draw_glyph_mono(System_Functions *system, Render_Target *target, Render_Font *font, u32 character, f32 x, f32 y, u32 color){
f32 advance = (f32)font_get_advance(font);
private_draw_glyph_mono(system, target, font, character, x, y, advance, color);
}
internal void
launch_rendering(System_Functions *system, Render_Target *target){
char *cursor = target->push_buffer;
char *cursor_end = cursor + target->size;
for (; cursor < cursor_end;){
Render_Piece_Header *header = ExtractStruct(Render_Piece_Header);
i32 type = header->type;
switch (type){
case piece_type_rectangle:
{
Render_Piece_Rectangle *rectangle = ExtractStruct(Render_Piece_Rectangle);
private_draw_rectangle(target, rectangle->rect, rectangle->color);
}break;
case piece_type_outline:
{
Render_Piece_Rectangle *rectangle = ExtractStruct(Render_Piece_Rectangle);
private_draw_rectangle_outline(target, rectangle->rect, rectangle->color);
}break;
case piece_type_gradient:
{
Render_Piece_Gradient *gradient = ExtractStruct(Render_Piece_Gradient);
private_draw_gradient(target, gradient->rect, unpack_color4(gradient->left_color), unpack_color4(gradient->right_color));
}break;
case piece_type_glyph:
{
Render_Piece_Glyph *glyph = ExtractStruct(Render_Piece_Glyph);
Render_Font *font = system->font.get_render_data_by_id(glyph->font_id);
Assert(font != 0);
private_draw_glyph(system, target, font, glyph->codepoint, glyph->pos.x, glyph->pos.y, glyph->color);
}break;
case piece_type_mono_glyph:
{
Render_Piece_Glyph *glyph = ExtractStruct(Render_Piece_Glyph);
Render_Font *font = system->font.get_render_data_by_id(glyph->font_id);
Assert(font != 0);
private_draw_glyph_mono(system, target, font, glyph->codepoint, glyph->pos.x, glyph->pos.y, glyph->color);
}break;
case piece_type_mono_glyph_advance:
{
Render_Piece_Glyph_Advance *glyph = ExtractStruct(Render_Piece_Glyph_Advance);
Render_Font *font = system->font.get_render_data_by_id(glyph->font_id);
Assert(font != 0);
private_draw_glyph_mono(system, target, font, glyph->codepoint, glyph->pos.x, glyph->pos.y, glyph->advance, glyph->color);
}break;
case piece_type_change_clip:
{
Render_Piece_Change_Clip *clip = ExtractStruct(Render_Piece_Change_Clip);
draw_set_clip(target, clip->box);
}break;
}
}
}
#undef ExtractStruct
// NOTE(allen): Thanks to insofaras. This is copy-pasted from some work he originally did to get free type working on Linux.
#undef internal
#include <ft2build.h>
#include FT_FREETYPE_H
#define internal static
internal void
font_load_page_inner(Partition *part, Render_Font *font, FT_Library ft, FT_Face face, b32 use_hinting, Glyph_Page *page, u32 page_number, i32 tab_width){
Temp_Memory temp = begin_temp_memory(part);
Assert(page != 0);
page->page_number = page_number;
// prepare to read glyphs into a temporary texture buffer
i32 max_glyph_w = face->size->metrics.x_ppem;
i32 max_glyph_h = font_get_height(font);
i32 tex_width = 64;
i32 tex_height = 0;
do {
tex_width *= 2;
float glyphs_per_row = ceilf(tex_width / (float) max_glyph_w);
float rows = ceilf(ITEM_PER_FONT_PAGE / glyphs_per_row);
tex_height = ceil32(rows * (max_glyph_h + 2));
} while(tex_height > tex_width);
tex_height = round_up_pot_u32(tex_height);
i32 pen_x = 0;
i32 pen_y = 0;
u32* pixels = push_array(part, u32, tex_width * tex_height);
memset(pixels, 0, tex_width * tex_height * sizeof(u32));
u32 ft_flags = FT_LOAD_RENDER;
if (use_hinting){
// NOTE(inso): FT_LOAD_TARGET_LIGHT does hinting only vertically, which looks nicer imo
// maybe it could be exposed as an option for hinting, instead of just on/off.
ft_flags |= FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_LIGHT;
}
else{
ft_flags |= (FT_LOAD_NO_AUTOHINT | FT_LOAD_NO_HINTING);
}
// fill the texture
u32 base_codepoint = (page_number << 8);
Glyph_Bounds *glyphs = &page->glyphs[0];
Glyph_Bounds *glyph_ptr = glyphs;
f32 *advances = &page->advance[0];
f32 *advance_ptr = advances;
for(u32 i = 0; i < ITEM_PER_FONT_PAGE; ++i, ++glyph_ptr, ++advance_ptr){
u32 codepoint = i + base_codepoint;
if(FT_Load_Char(face, codepoint, ft_flags) == 0){
i32 w = face->glyph->bitmap.width;
i32 h = face->glyph->bitmap.rows;
i32 ascent = font_get_ascent(font);
// move to next line if necessary
if(pen_x + w >= tex_width){
pen_x = 0;
pen_y += (max_glyph_h + 2);
}
// set all this stuff the renderer needs
glyph_ptr->x0 = (f32)(pen_x);
glyph_ptr->y0 = (f32)(pen_y);
glyph_ptr->x1 = (f32)(pen_x + w);
glyph_ptr->y1 = (f32)(pen_y + h + 1);
glyph_ptr->xoff = (f32)(face->glyph->bitmap_left);
glyph_ptr->yoff = (f32)(ascent - face->glyph->bitmap_top);
glyph_ptr->xoff2 = glyph_ptr->xoff + w;
glyph_ptr->yoff2 = glyph_ptr->yoff + h + 1;
// TODO(allen): maybe advance data should be integers?
*advance_ptr = (f32)ceil32(face->glyph->advance.x / 64.0f);
// write to texture atlas
i32 pitch = face->glyph->bitmap.pitch;
for(i32 Y = 0; Y < h; ++Y){
for(i32 X = 0; X < w; ++X){
i32 x = pen_x + X;
i32 y = pen_y + Y;
pixels[y * tex_width + x] = face->glyph->bitmap.buffer[Y * pitch + X] * 0x01010101;
}
}
pen_x = ceil32(glyph_ptr->x1 + 1);
}
}
// upload texture
tex_height = round_up_pot_u32(pen_y + max_glyph_h + 2);
page->tex_width = tex_width;
page->tex_height = tex_height;
glGenTextures(1, &page->tex);
glBindTexture(GL_TEXTURE_2D, page->tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, tex_width, tex_height, 0, GL_ALPHA, GL_UNSIGNED_INT, pixels);
glBindTexture(GL_TEXTURE_2D, 0);
end_temp_memory(temp);
// whitespace spacing stuff
if (page_number == 0){
f32 space_adv = advances[' '];
f32 backslash_adv = advances['\\'];
f32 r_adv = advances['r'];
advances['\n'] = space_adv;
advances['\r'] = backslash_adv + r_adv;
advances['\t'] = space_adv*tab_width;
}
}
internal b32
font_load_page(System_Functions *system, Partition *part, Render_Font *font, Glyph_Page *page, u32 page_number, u32 pt_size, b32 use_hinting){
char *filename = font->filename;
// TODO(allen): Stop redoing all this init for each call.
FT_Library ft;
FT_Init_FreeType(&ft);
FT_Face face;
FT_New_Face(ft, filename, 0, &face);
FT_Size_RequestRec_ size = {};
size.type = FT_SIZE_REQUEST_TYPE_NOMINAL;
size.height = pt_size << 6;
FT_Request_Size(face, &size);
// NOTE(allen): set texture and glyph data.
font_load_page_inner(part, font, ft, face, use_hinting, page, page_number, 4);
FT_Done_FreeType(ft);
return(true);
}
internal b32
font_load(System_Functions *system, Partition *part, Render_Font *font, i32 pt_size, b32 use_hinting){
char *filename = font->filename;
// TODO(allen): Stop redoing all this init for each call.
FT_Library ft;
FT_Init_FreeType(&ft);
FT_Face face;
FT_New_Face(ft, filename, 0, &face);
FT_Size_RequestRec_ size = {};
size.type = FT_SIZE_REQUEST_TYPE_NOMINAL;
size.height = pt_size << 6;
FT_Request_Size(face, &size);
// set size & metrics
font->ascent = ceil32 (face->size->metrics.ascender / 64.0f);
font->descent = floor32 (face->size->metrics.descender / 64.0f);
font->advance = ceil32 (face->size->metrics.max_advance / 64.0f);
font->height = ceil32 (face->size->metrics.height / 64.0f);
font->line_skip = font->height - (font->ascent - font->descent);
font->height -= font->line_skip;
font->line_skip = 0;
// NOTE(allen): set texture and glyph data.
Glyph_Page *page = font_get_or_make_page(system, font, 0);
// NOTE(allen): Setup some basic spacing stuff.
f32 backslash_adv = page->advance['\\'];
f32 max_hex_advance = 0.f;
for (u32 i = '0'; i <= '9'; ++i){
f32 adv = page->advance[i];
max_hex_advance = Max(max_hex_advance, adv);
}
for (u32 i = 'a'; i <= 'f'; ++i){
f32 adv = page->advance[i];
max_hex_advance = Max(max_hex_advance, adv);
}
for (u32 i = 'A'; i <= 'F'; ++i){
f32 adv = page->advance[i];
max_hex_advance = Max(max_hex_advance, adv);
}
font->byte_advance = backslash_adv + max_hex_advance*2;
font->byte_sub_advances[0] = backslash_adv;
font->byte_sub_advances[1] = max_hex_advance;
font->byte_sub_advances[2] = max_hex_advance;
FT_Done_FreeType(ft);
return(true);
}
internal void
system_set_page(System_Functions *system, Partition *part, Render_Font *font, Glyph_Page *page, u32 page_number, u32 pt_size, b32 use_hinting){
memset(page, 0, sizeof(*page));
if (part->base == 0){
*part = sysshared_scratch_partition(MB(8));
}
b32 success = false;
for (u32 R = 0; R < 3; ++R){
success = font_load_page(system, part, font, page, page_number, pt_size, use_hinting);
if (success){
break;
}
else{
sysshared_partition_double(part);
}
}
}
internal void
system_set_font(System_Functions *system, Partition *part, Render_Font *font, String filename, String name, u32 pt_size, b32 use_hinting){
memset(font, 0, sizeof(*font));
copy_partial_cs(font->filename, sizeof(font->filename)-1, filename);
font->filename_len = filename.size;
font->filename[font->filename_len] = 0;
copy_partial_cs(font->name, sizeof(font->name)-1, name);
font->name_len = name.size;
font->name[font->name_len] = 0;
if (part->base == 0){
*part = sysshared_scratch_partition(MB(8));
}
b32 success = false;
for (u32 R = 0; R < 3; ++R){
success = font_load(system, part, font, pt_size, use_hinting);
if (success){
break;
}
else{
sysshared_partition_double(part);
}
}
}
#endif
// BOTTOM
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