249 lines
7.5 KiB
C++
249 lines
7.5 KiB
C++
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/*
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* Overreact - Mr. 4th Dimention
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* Allen Webster
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* 03.21.2015 (mm.dd.yyyy)
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*
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* Graphics Layer.
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*/
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// TOP
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internal Blit_Rect
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rect_from_target(Game_Render_Target *target){
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Blit_Rect result;
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result.x_start = 0;
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result.y_start = 0;
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result.x_end = target->width;
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result.y_end = target->height;
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return result;
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}
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internal void
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bitmap_open_file(char *filename, Bitmap_File *bmp_file){
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File file = system_load_file(filename);
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if (file.data && file.size > sizeof(Bitmap_Header)){
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*bmp_file = {};
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bmp_file->file = file;
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bmp_file->header = *(Bitmap_Header*)file.data;
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bmp_file->byte_pitch =
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bmp_file->header.image_size / bmp_file->header.h;
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Assert(bmp_file->header.type == 0x4D42);
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Assert(bmp_file->header.compression == 0);
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}
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}
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internal i32
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bitmap_data_requirement(Bitmap_File *bmp_file){
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i32 w, h;
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w = round_up_POT(bmp_file->header.w);
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h = round_up_POT(bmp_file->header.h);
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return 4*(w * h);
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}
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internal void
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bitmap_fill_image(Bitmap_File *bmp_file, Image *image){
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image->width = round_up_POT(bmp_file->header.w);
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image->height = round_up_POT(bmp_file->header.h);
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image->pitch = 4*image->width;
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i32 true_width, true_height;
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true_width = bmp_file->header.w;
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true_height = bmp_file->header.h;
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image->img_width = true_width;
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image->img_height = true_height;
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i32 byte_per_pixel = bmp_file->header.bits_per_pixel >> 3;
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u8 *pixel_line = (u8*)bmp_file->file.data + bmp_file->header.offset;
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u8 *dest_line = (u8*)image->data;
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if (byte_per_pixel == 3){
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for (i32 y = 0; y < true_height; ++y){
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u8 *pixel = pixel_line;
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u32 *dest = (u32*)dest_line;
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for (i32 x = 0; x < true_width; ++x){
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#if 0
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*dest = (0xFF << 24) | (pixel[2] << 16) | (pixel[1] << 8) | (pixel[0]);
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#else
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*dest = (0xFF << 24) | (pixel[0] << 16) | (pixel[1] << 8) | (pixel[2]);
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#endif
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pixel += 3;
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++dest;
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}
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pixel_line += bmp_file->byte_pitch;
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dest_line += image->pitch;
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}
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}
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else{
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for (i32 y = 0; y < true_height; ++y){
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u32 *pixel = (u32*)pixel_line;
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u32 *dest = (u32*)dest_line;
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for (i32 x = 0; x < true_width; ++x){
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#if 0
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*dest =
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(*pixel & 0xFF00FF00) |
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((*pixel & 0x00FF0000) >> 16) |
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((*pixel & 0x000000FF) << 16);
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#else
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*dest = *pixel;
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#endif
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++pixel;
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++dest;
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}
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pixel_line += bmp_file->byte_pitch;
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dest_line += image->pitch;
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}
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}
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}
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internal void
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bitmap_free_file(Bitmap_File *bmp_file){
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system_free_file(bmp_file->file);
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}
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// TODO(allen): eliminate this?
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internal i32
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font_init(){
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return 0;
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}
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inline internal i32
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font_predict_size(i32 pt_size){
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return pt_size*pt_size*128;
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}
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// TODO(allen): switch to 0 = FAIL, 1 = SUCCESS
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internal i32
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font_load(char *filename, Font *font_out, i32 pt_size,
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void *font_block, i32 font_block_size){
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i32 result = 0;
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File file;
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file = system_load_file(filename);
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if (!file.data){
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result = 1;
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}
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else{
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stbtt_fontinfo font;
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if (!stbtt_InitFont(&font, (u8*)file.data, 0)){
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result = 1;
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}
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else{
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i32 ascent, descent, line_gap;
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real32 scale;
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stbtt_GetFontVMetrics(&font, &ascent, &descent, &line_gap);
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scale = stbtt_ScaleForPixelHeight(&font, (real32)pt_size);
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real32 scaled_ascent, scaled_descent, scaled_line_gap;
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scaled_ascent = scale*ascent;
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scaled_descent = scale*descent;
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scaled_line_gap = scale*line_gap;
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font_out->height = (i32)(scaled_ascent - scaled_descent + scaled_line_gap);
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font_out->ascent = (i32)(scaled_ascent);
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font_out->descent = (i32)(scaled_descent);
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font_out->line_skip = (i32)(scaled_line_gap);
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u8 *memory_cursor = (u8*)font_block;
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Assert(pt_size*pt_size*128 <= font_block_size);
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i32 tex_width, tex_height;
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tex_width = pt_size*128;
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tex_height = pt_size*2;
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font_out->tex_width = tex_width;
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font_out->tex_height = tex_height;
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if (stbtt_BakeFontBitmap((u8*)file.data, 0, (real32)pt_size,
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memory_cursor, tex_width, tex_height, 0, 128, font_out->chardata) <= 0){
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result = 0;
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}
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else{
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GLuint font_tex;
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glGenTextures(1, &font_tex);
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glBindTexture(GL_TEXTURE_2D, font_tex);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, tex_width, tex_height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, memory_cursor);
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font_out->tex = font_tex;
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}
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i32 max_advance = 0;
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for (u16 code_point = 0; code_point < 128; ++code_point){
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if (stbtt_FindGlyphIndex(&font, code_point) != 0){
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font_out->glyphs[code_point].exists = 1;
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font_out->glyphs[code_point].advance = font_out->chardata[code_point].xadvance;
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i32 advance = Ceil(font_out->chardata[code_point].xadvance);
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if (max_advance < advance){
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max_advance = advance;
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}
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}
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}
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font_out->advance = max_advance;
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}
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system_free_file(file);
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}
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return result;
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}
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internal void
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font_draw_glyph_clipped(Game_Render_Target *target,
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Font *font, u16 character,
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real32 x, real32 y, u32 color,
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Blit_Rect clip_box){
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if (clip_box.x_start < clip_box.x_end && clip_box.y_start < clip_box.y_end){
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real32 x_shift, y_shift;
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x_shift = font->chardata[character].xoff;
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y_shift = (real32)font->ascent;// + font->chardata[character].yoff;
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x += x_shift;
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y += y_shift;
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glScissor(clip_box.x_start,
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target->height - clip_box.y_end,
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clip_box.x_end - clip_box.x_start,
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clip_box.y_end - clip_box.y_start);
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stbtt_aligned_quad q;
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stbtt_GetBakedQuadUnrounded(font->chardata, font->tex_width, font->tex_height, character, &x, &y, &q, 1);
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Vec3 c = unpack_color3(color);
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glColor3f(c.r, c.g, c.b);
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glBindTexture(GL_TEXTURE_2D, font->tex);
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glBegin(GL_QUADS);
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{
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glTexCoord2f(q.s0, q.t1); glVertex2f(q.x0, q.y1);
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glTexCoord2f(q.s1, q.t1); glVertex2f(q.x1, q.y1);
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glTexCoord2f(q.s1, q.t0); glVertex2f(q.x1, q.y0);
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glTexCoord2f(q.s0, q.t0); glVertex2f(q.x0, q.y0);
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}
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glEnd();
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glScissor(0, 0, target->width, target->height);
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}
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}
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internal void
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font_draw_glyph(Game_Render_Target *target,
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Font *font, u16 character,
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real32 x, real32 y, u32 color){
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Blit_Rect screen = rect_from_target(target);
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font_draw_glyph_clipped(target, font, character, x, y, color, screen);
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}
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