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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
//
// Standard implementation of file system stuff
// based on the file track layer.
//
struct Shared_Vars{
File_Track_System track;
void *track_table;
u32 track_table_size;
u32 track_node_size;
};
static Shared_Vars shared_vars;
internal void
init_shared_vars(){
shared_vars.track_table_size = (16 << 10);
shared_vars.track_table = system_get_memory(shared_vars.track_table_size);
shared_vars.track_node_size = (16 << 10);
void *track_nodes = system_get_memory(shared_vars.track_node_size);
i32 track_result =
init_track_system(&shared_vars.track,
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_get_memory(new_table_size);
move_track_system(&shared_vars.track, new_table, new_table_size);
system_free_memory(shared_vars.track_table);
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_get_memory(shared_vars.track_node_size);
expand_track_system_listeners(&shared_vars.track, node_expansion, shared_vars.track_node_size);
}break;
default: result = 1; break;
}
return(result);
}
internal
Sys_Add_Listener_Sig(system_add_listener){
b32 result = 0;
for (;;){
i32 track_result = add_listener(&shared_vars.track, filename);
if (handle_track_out_of_memory(track_result)){
if (track_result == FileTrack_Good){
result = 1;
}
break;
}
}
return(result);
}
internal
Sys_Remove_Listener_Sig(system_remove_listener){
i32 result = 0;
i32 track_result = remove_listener(&shared_vars.track, filename);
if (track_result == FileTrack_Good){
result = 1;
}
return(result);
}
internal
Sys_Get_File_Change_Sig(system_get_file_change){
i32 result = 0;
i32 size = 0;
i32 get_result = get_change_event(&shared_vars.track, buffer, max, &size);
*required_size = size;
*mem_too_small = 0;
if (get_result == FileTrack_Good){
result = 1;
}
else if (get_result == FileTrack_MemoryTooSmall){
*mem_too_small = 1;
result = 1;
}
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_get_memory(size+1);
if (!result.data){
result = null_file_data;
}
else{
if (!system_load_file(handle, result.data, size)){
system_free_memory(result.data);
result = null_file_data;
}
}
}
system_load_close(handle);
}
return(result);
}
internal b32
usable_ascii(char c){
b32 result = 1;
if ((c < ' ' || c > '~') && c != '\n' && c != '\r' && c != '\t'){
result = 0;
}
return(result);
}
internal void
sysshared_filter_real_files(char **files, i32 *file_count){
i32 i, j;
i32 end;
end = *file_count;
for (i = 0, j = 0; i < end; ++i){
if (system_file_can_be_made(files[i])){
files[j] = files[i];
++j;
}
}
*file_count = j;
}
internal Partition
sysshared_scratch_partition(i32 size){
void *data = system_get_memory(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_get_memory(new_size);
memcpy(data, part->base, part->pos);
system_free_memory(part->base);
part->base = (char*)data;
}
}
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){
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){
// 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);
}
inline int32_t
fits_inside(i32_Rect rect, i32_Rect outer){
return (rect.x0 >= outer.x0 && rect.x1 <= outer.x1 &&
rect.y0 >= outer.y0 && rect.y1 <= outer.y1);
}
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;
draw_push_piece_clip(target, clip_box);
}
internal i32_Rect
draw_pop_clip(Render_Target *target){
i32_Rect result = {0};
i32_Rect clip_box = {0};
Assert(target->clip_top > 0);
result = target->clip_boxes[target->clip_top];
--target->clip_top;
clip_box = target->clip_boxes[target->clip_top];
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;
r.x0 = rect.x0 + .5f;
r.y0 = rect.y0 + .5f;
r.x1 = rect.x1 - .5f;
r.y1 = rect.y1 - .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_Data *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_Data *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(Render_Target *target, Render_Font *font, u8 character, f32 x, f32 y, u32 color){
Render_Quad q = get_render_quad(font->glyphs + character, font->tex_width, font->tex_height, x, y);
draw_set_color(target, color);
draw_bind_texture(target, font->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(Render_Target *target, Render_Font *font, u8 character,
f32 x, f32 y, f32 advance, u32 color){
f32 left = font->glyphs[character].x0;
f32 right = font->glyphs[character].x1;
f32 width = (right - left);
f32 x_shift = (advance - width) * .5f;
x += x_shift;
Render_Quad q = get_exact_render_quad(
font->glyphs + character,
font->tex_width, font->tex_height, x, y
);
draw_set_color(target, color);
draw_bind_texture(target, font->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(Render_Target *target, Render_Font *font, u8 character, f32 x, f32 y, u32 color){
private_draw_glyph_mono(target, font, character, x, y, (f32)font->advance, color);
}
internal void
launch_rendering(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 = get_font_info(&target->font_set, glyph->font_id)->font;
if (font){
private_draw_glyph(target, font, glyph->character, 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 = get_font_info(&target->font_set, glyph->font_id)->font;
if (font){
private_draw_glyph_mono(target, font, glyph->character, 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 = get_font_info(&target->font_set, glyph->font_id)->font;
if (font){
private_draw_glyph_mono(target, font, glyph->character, 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
internal void*
part_alloc(i32 size, void *context){
Partition *part = (Partition*)context;
void *result = push_block(part, size);
return(result);
}
internal void
part_free(void *ptr, void *context){
}
#define STBTT_malloc part_alloc
#define STBTT_free part_free
#define STB_TRUETYPE_IMPLEMENTATION
#include "stb_truetype.h"
internal i32
stb_font_load(Partition *part,
Render_Font *font_out,
char *filename_untranslated,
i32 pt_size,
i32 tab_width,
i32 oversample,
b32 store_texture){
char space_[1024];
String filename = make_fixed_width_string(space_);
b32 translate_success = sysshared_to_binary_path(&filename, filename_untranslated);
if (!translate_success) return 0;
i32 result = 1;
stbtt_packedchar chardata[256];
File_Data file = sysshared_load_file(filename.str);
if (!file.data){
result = 0;
}
else{
stbtt_fontinfo font;
if (!stbtt_InitFont(&font, (u8*)file.data, 0)){
result = 0;
}
else{
memset(font_out, 0, sizeof(*font_out));
i32 ascent, descent, line_gap;
stbtt_GetFontVMetrics(&font, &ascent, &descent, &line_gap);
f32 scale = stbtt_ScaleForPixelHeight(&font, (f32)pt_size);
f32 scaled_ascent = scale*ascent;
f32 scaled_descent = scale*descent;
f32 scaled_line_gap = scale*line_gap;
font_out->height = (i32)(scaled_ascent - scaled_descent + scaled_line_gap);
font_out->ascent = (i32)(scaled_ascent);
font_out->descent = (i32)(scaled_descent);
font_out->line_skip = (i32)(scaled_line_gap);
if (store_texture){
Temp_Memory temp = begin_temp_memory(part);
i32 tex_width = pt_size*16*oversample;
i32 tex_height = pt_size*16*oversample;
void *block = sysshared_push_block(part, tex_width * tex_height);
font_out->tex_width = tex_width;
font_out->tex_height = tex_height;
/////////////////////////////////////////////////////////////////
stbtt_pack_context spc;
if (stbtt_PackBegin(&spc, (u8*)block, tex_width, tex_height,
tex_width, 1, part)){
stbtt_PackSetOversampling(&spc, oversample, oversample);
if (!stbtt_PackFontRange(&spc, (u8*)file.data, 0,
STBTT_POINT_SIZE((f32)pt_size),
0, 128, chardata)){
result = 0;
}
stbtt_PackEnd(&spc);
}
else{
result = 0;
}
/////////////////////////////////////////////////////////////////
if (result){
GLuint font_tex;
glGenTextures(1, &font_tex);
glBindTexture(GL_TEXTURE_2D, font_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);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, tex_width, tex_height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, block);
font_out->tex = font_tex;
glBindTexture(GL_TEXTURE_2D, 0);
f32 *advance_data = font_out->advance_data;
Glyph_Data *glyphs = font_out->glyphs;
for (u8 code_point = 0; code_point < 128; ++code_point){
advance_data[code_point] = (f32)(ceil32(chardata[code_point].xadvance));
glyphs[code_point].x0 = chardata[code_point].x0;
glyphs[code_point].y0 = chardata[code_point].y0;
glyphs[code_point].x1 = chardata[code_point].x1;
glyphs[code_point].y1 = chardata[code_point].y1;
glyphs[code_point].xoff = chardata[code_point].xoff;
glyphs[code_point].yoff = chardata[code_point].yoff + font_out->ascent;
glyphs[code_point].xoff2 = chardata[code_point].xoff2;
glyphs[code_point].yoff2 = chardata[code_point].yoff2 + font_out->ascent;
}
glyphs['\r'] = glyphs[' '];
advance_data['\r'] = advance_data[' '];
glyphs['\n'] = glyphs[' '];
advance_data['\n'] = advance_data[' '];
glyphs['\t'] = glyphs[' '];
advance_data['\t'] = advance_data[' ']*tab_width;
i32 max_advance = 0;
for (u8 code_point = 0; code_point < 128; ++code_point){
if (stbtt_FindGlyphIndex(&font, code_point) != 0){
font_out->glyphs[code_point].exists = 1;
i32 advance = ceil32(advance_data[code_point]);
if (max_advance < advance){
max_advance = advance;
}
}
}
font_out->advance = max_advance - 1;
}
end_temp_memory(temp);
}
}
system_free_memory(file.data);
}
return(result);
}
// NOTE(allen): Thanks to insofaras.
// This is copy-pasted from some work he
// did to get free type working on Linux.
#undef internal
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_LCD_FILTER_H
#define internal static
internal u32
next_pow_of_2(u32 v){
--v;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
return ++v;
}
#define NUM_GLYPHS 128
#define ENABLE_LCD_FILTER 0
internal b32
font_load_freetype(Partition *part,
Render_Font *rf,
char *filename,
i32 pt_size,
i32 tab_width,
b32 use_hinting){
memset(rf, 0, sizeof(*rf));
//TODO(inso): put stuff in linuxvars / init in main
FT_Library ft;
FT_Face face;
b32 use_lcd_filter = 0;
FT_Init_FreeType(&ft);
//NOTE(inso): i'm not sure the LCD filter looks better, and it doesn't work perfectly with the coloring stuff
// it will probably need shaders to work properly
#if ENABLE_LCD_FILTER
if(FT_Library_SetLcdFilter(ft, FT_LCD_FILTER_DEFAULT) == 0){
puts("LCD Filter on");
use_lcd_filter = 1;
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
}
#endif
FT_New_Face(ft, filename, 0, &face);
// set size & metrics
FT_Size_RequestRec_ size = {};
size.type = FT_SIZE_REQUEST_TYPE_NOMINAL;
size.height = pt_size << 6;
FT_Request_Size(face, &size);
rf->loaded = 1;
rf->ascent = ceil32 (face->size->metrics.ascender / 64.0f);
rf->descent = floor32 (face->size->metrics.descender / 64.0f);
rf->advance = ceil32 (face->size->metrics.max_advance / 64.0f);
rf->height = ceil32 (face->size->metrics.height / 64.0f);
rf->line_skip = rf->height - (rf->ascent - rf->descent);
rf->height -= rf->line_skip;
rf->line_skip = 0;
i32 max_glyph_w = face->size->metrics.x_ppem;
i32 max_glyph_h = rf->height;
i32 tex_width = 64;
i32 tex_height = 0;
// estimate upper bound on texture width
do {
tex_width *= 2;
float glyphs_per_row = ceilf(tex_width / (float) max_glyph_w);
float rows = ceilf(NUM_GLYPHS / glyphs_per_row);
tex_height = ceil32(rows * (max_glyph_h + 2));
} while(tex_height > tex_width);
tex_height = next_pow_of_2(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_extra_flags = 0;
if (use_lcd_filter){
ft_extra_flags = FT_LOAD_TARGET_LCD;
}
else{
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_extra_flags = FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_LIGHT;
}
else{
ft_extra_flags = (FT_LOAD_NO_AUTOHINT | FT_LOAD_NO_HINTING);
}
}
for(i32 i = 0; i < NUM_GLYPHS; ++i){
if(FT_Load_Char(face, i, FT_LOAD_RENDER | ft_extra_flags) != 0) continue;
i32 w = face->glyph->bitmap.width;
i32 h = face->glyph->bitmap.rows;
// lcd filter produces RGB bitmaps, need to account for the extra components
if(use_lcd_filter){
w /= 3;
}
// 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_Data* c = rf->glyphs + i;
c->x0 = (f32)(pen_x);
c->y0 = (f32)(pen_y);
c->x1 = (f32)(pen_x + w);
c->y1 = (f32)(pen_y + h + 1);
c->xoff = (f32)(face->glyph->bitmap_left);
c->yoff = (f32)(rf->ascent - face->glyph->bitmap_top);
c->xoff2 = w + c->xoff;
c->yoff2 = h + c->yoff + 1;
// TODO(allen): maybe advance data should be integers for a while...
// I require the actual values to be integers anyway... hmm...
rf->advance_data[i] = (f32)ceil32(face->glyph->advance.x / 64.0f);
rf->glyphs[i].exists = 1;
i32 pitch = face->glyph->bitmap.pitch;
// write to texture atlas
for(i32 j = 0; j < h; ++j){
for(i32 i = 0; i < w; ++i){
i32 x = pen_x + i;
i32 y = pen_y + j;
if(use_lcd_filter){
#if 1
u8 a = face->glyph->bitmap.buffer[j * pitch + i * 3 + 1];
u8 r = face->glyph->bitmap.buffer[j * pitch + i * 3 + 0];
u8 b = face->glyph->bitmap.buffer[j * pitch + i * 3 + 2];
pixels[y * tex_width + x] = (a << 24) | (b << 16) | (a << 8) | r;
#else
u8 r = face->glyph->bitmap.buffer[j * pitch + i * 3];
u8 g = face->glyph->bitmap.buffer[j * pitch + i * 3 + 1];
u8 b = face->glyph->bitmap.buffer[j * pitch + i * 3 + 2];
u8 a = (u8)ROUND32((r + g + b) / 3.0f);
pixels[y * tex_width + x] = (a << 24) | (r << 16) | (g << 8) | b;
#endif
} else {
pixels[y * tex_width + x] = face->glyph->bitmap.buffer[j * pitch + i] * 0x1010101;
}
}
}
pen_x = ceil32(c->x1 + 1);
}
// TODO(allen): advance data is still too stupid.
// Provide an "unedited" version, then generate these
// on the fly. Maybe later introduce a caching system or whatevs.
f32 *adv = rf->advance_data;
for (i32 i = 0; i < 256; ++i){
if (i < ' ' || i > '~'){
switch (i){
case '\n':
adv[i] = adv[' '];
break;
case '\r':
adv[i] = adv['\\'] + adv['r'];
break;
case '\t':
adv[i] = adv[' ']*tab_width;
break;
default:
{
int8_t d1 = (int8_t)(i/0x10), d2 = (int8_t)(i%0x10);
char c1 = '0' + d1, c2 = '0' + d2;
if (d1 >= 0xA){
c1 = ('A' - 0xA) + d1;
}
if (d2 >= 0xA){
c2 = ('A' - 0xA) + d2;
}
adv[i] = adv['\\'] + adv[c1] + adv[c2];
}break;
}
}
}
FT_Done_FreeType(ft);
tex_height = next_pow_of_2(pen_y + max_glyph_h + 2);
rf->tex_width = tex_width;
rf->tex_height = tex_height;
// upload texture
glGenTextures(1, &rf->tex);
glBindTexture(GL_TEXTURE_2D, rf->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);
if(use_lcd_filter){
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_width, tex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
} else {
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, tex_width, tex_height, 0, GL_ALPHA, GL_UNSIGNED_INT, pixels);
}
glBindTexture(GL_TEXTURE_2D, 0);
return 1;
}
internal
Release_Font_Sig(draw_release_font){
glDeleteTextures(1, &font->tex);
font->tex = 0;
}
// BOTTOM
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