509 lines
16 KiB
C++
509 lines
16 KiB
C++
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/*
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* Mr. 4th Dimention - Allen Webster
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*
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* 12.17.2014
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*
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* Rendering layer for project codename "4ed"
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*
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*/
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// TOP
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inline void
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draw_set_clip(Render_Target *target, i32_Rect clip_box){
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glScissor(clip_box.x0,
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target->height - clip_box.y1,
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clip_box.x1 - clip_box.x0,
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clip_box.y1 - clip_box.y0);
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}
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inline void
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draw_bind_texture(Render_Target *target, i32 texid){
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if (target->bound_texture != texid){
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glBindTexture(GL_TEXTURE_2D, texid);
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target->bound_texture = texid;
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}
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}
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inline void
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draw_set_color(Render_Target *target, u32 color){
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if (target->color != color){
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target->color = color;
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Vec4 c = unpack_color4(color);
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glColor4f(c.r, c.g, c.b, c.a);
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}
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}
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#define PutStruct(s,x) *(s*)(target->push_buffer + target->size) = x; target->size += sizeof(s)
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internal void
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draw_push_piece(Render_Target *target, Render_Piece_Combined piece){
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PutStruct(Render_Piece_Header, piece.header);
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switch (piece.header.type){
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case piece_type_rectangle:
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case piece_type_outline:
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PutStruct(Render_Piece_Rectangle, piece.rectangle);
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break;
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case piece_type_gradient:
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PutStruct(Render_Piece_Gradient, piece.gradient);
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break;
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case piece_type_glyph:
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case piece_type_mono_glyph:
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PutStruct(Render_Piece_Glyph, piece.glyph);
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break;
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case piece_type_mono_glyph_advance:
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PutStruct(Render_Piece_Glyph_Advance, piece.glyph_advance);
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break;
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}
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Assert(target->size <= target->max);
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}
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internal void
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draw_push_piece_clip(Render_Target *target, i32_Rect clip_box){
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// TODO(allen): optimize out if there are two clip box changes in a row
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Render_Piece_Change_Clip clip;
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Render_Piece_Header header;
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header.type = piece_type_change_clip;
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clip.box = clip_box;
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PutStruct(Render_Piece_Header, header);
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PutStruct(Render_Piece_Change_Clip, clip);
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}
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internal void
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draw_push_clip(Render_Target *target, i32_Rect clip_box){
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Assert(target->clip_top == -1 ||
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fits_inside(clip_box, target->clip_boxes[target->clip_top]));
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Assert(target->clip_top+1 < ArrayCount(target->clip_boxes));
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target->clip_boxes[++target->clip_top] = clip_box;
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draw_push_piece_clip(target, clip_box);
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}
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internal void
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draw_pop_clip(Render_Target *target){
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i32_Rect clip_box;
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Assert(target->clip_top > 0);
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--target->clip_top;
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clip_box = target->clip_boxes[target->clip_top];
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draw_push_piece_clip(target, clip_box);
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}
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#define ExtractStruct(s) ((s*)cursor); cursor += sizeof(s)
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inline void
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private_draw_rectangle(Render_Target *target, f32_Rect rect, u32 color){
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draw_set_color(target, color);
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draw_bind_texture(target, 0);
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glBegin(GL_QUADS);
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{
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glVertex2f(rect.x0, rect.y0);
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glVertex2f(rect.x0, rect.y1);
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glVertex2f(rect.x1, rect.y1);
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glVertex2f(rect.x1, rect.y0);
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}
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glEnd();
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}
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inline void
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private_draw_rectangle_outline(Render_Target *target, f32_Rect rect, u32 color){
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f32_Rect r;
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r.x0 = rect.x0 + .5f;
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r.y0 = rect.y0 + .5f;
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r.x1 = rect.x1 - .5f;
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r.y1 = rect.y1 - .5f;
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draw_set_color(target, color);
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draw_bind_texture(target, 0);
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glBegin(GL_LINE_STRIP);
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{
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glVertex2f(r.x0, r.y0);
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glVertex2f(r.x1, r.y0);
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glVertex2f(r.x1, r.y1);
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glVertex2f(r.x0, r.y1);
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glVertex2f(r.x0, r.y0);
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}
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glEnd();
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}
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inline void
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private_draw_gradient(Render_Target *target, f32_Rect rect,
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Vec4 color_left, Vec4 color_right){
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Vec4 cl = color_left;
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Vec4 cr = color_right;
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draw_bind_texture(target, 0);
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glBegin(GL_QUADS);
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{
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glColor4f(cl.r, cl.g, cl.b, cl.a);
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glVertex2f(rect.x0, rect.y0);
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glVertex2f(rect.x0, rect.y1);
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glColor4f(cr.r, cr.g, cr.b, cr.a);
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glVertex2f(rect.x1, rect.y1);
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glVertex2f(rect.x1, rect.y0);
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}
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glEnd();
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}
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inline void
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private_draw_glyph(Render_Target *target, Render_Font *font,
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u8 character, f32 x, f32 y, u32 color){
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f32 x_shift, y_shift;
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x_shift = 0;
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y_shift = (f32)font->ascent;
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x += x_shift;
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y += y_shift;
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stbtt_aligned_quad q;
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stbtt_GetPackedQuad(font->chardata, font->tex_width, font->tex_height,
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character, &x, &y, &q, 0);
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draw_set_color(target, color);
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draw_bind_texture(target, 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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}
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inline void
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private_draw_glyph_mono(Render_Target *target, Render_Font *font, u8 character,
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f32 x, f32 y, f32 advance, u32 color){
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f32 x_shift, y_shift;
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i32 left = font->chardata[character].x0;
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i32 right = font->chardata[character].x1;
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i32 width = (right - left);
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x_shift = (f32)(advance - width) * .5f - font->chardata[character].xoff;
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y_shift = (f32)font->ascent;
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x += x_shift;
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y += y_shift;
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stbtt_aligned_quad q;
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stbtt_GetPackedQuad(font->chardata, font->tex_width, font->tex_height,
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character, &x, &y, &q, 0);
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draw_set_color(target, color);
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draw_bind_texture(target, 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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}
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inline void
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private_draw_glyph_mono(Render_Target *target, Render_Font *font, u8 character,
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real32 x, real32 y, u32 color){
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private_draw_glyph_mono(target, font, character, x, y, (f32)font->advance, color);
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}
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internal void
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launch_rendering(Render_Target *target){
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byte *cursor = target->push_buffer;
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byte *cursor_end = cursor + target->size;
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for (; cursor < cursor_end;){
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Render_Piece_Header *header = ExtractStruct(Render_Piece_Header);
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i32 type = header->type;
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switch (type){
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case piece_type_rectangle:
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{
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Render_Piece_Rectangle *rectangle =
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ExtractStruct(Render_Piece_Rectangle);
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private_draw_rectangle(target, rectangle->rect, rectangle->color);
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}break;
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case piece_type_outline:
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{
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Render_Piece_Rectangle *rectangle =
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ExtractStruct(Render_Piece_Rectangle);
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private_draw_rectangle_outline(target, rectangle->rect, rectangle->color);
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}break;
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case piece_type_gradient:
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{
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Render_Piece_Gradient *gradient =
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ExtractStruct(Render_Piece_Gradient);
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private_draw_gradient(target, gradient->rect,
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unpack_color4(gradient->left_color),
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unpack_color4(gradient->right_color));
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}break;
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case piece_type_glyph:
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{
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Render_Piece_Glyph *glyph =
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ExtractStruct(Render_Piece_Glyph);
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Render_Font *font = get_font_info(&target->font_set, glyph->font_id)->font;
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if (font)
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private_draw_glyph(target, font, glyph->character,
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glyph->pos.x, glyph->pos.y, glyph->color);
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}break;
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case piece_type_mono_glyph:
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{
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Render_Piece_Glyph *glyph =
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ExtractStruct(Render_Piece_Glyph);
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Render_Font *font = get_font_info(&target->font_set, glyph->font_id)->font;
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if (font)
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private_draw_glyph_mono(target, font, glyph->character,
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glyph->pos.x, glyph->pos.y, glyph->color);
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}break;
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case piece_type_mono_glyph_advance:
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{
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Render_Piece_Glyph_Advance *glyph =
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ExtractStruct(Render_Piece_Glyph_Advance);
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Render_Font *font = get_font_info(&target->font_set, glyph->font_id)->font;
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if (font)
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private_draw_glyph_mono(target, font, glyph->character,
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glyph->pos.x, glyph->pos.y,
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glyph->advance, glyph->color);
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}break;
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case piece_type_change_clip:
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{
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Render_Piece_Change_Clip *clip =
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ExtractStruct(Render_Piece_Change_Clip);
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draw_set_clip(target, clip->box);
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}break;
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}
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}
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}
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#undef ExtractStruct
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internal i32
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draw_font_info_load(Partition *partition,
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char *filename_untranslated,
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i32 pt_size, i32 *height, i32 *advance){
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char space_[1024];
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String filename = make_fixed_width_string(space_);
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b32 translate_success = system_to_binary_path(&filename, filename_untranslated);
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if (!translate_success) return 0;
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i32 result = 1;
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Data file;
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file = system_load_file(filename.str);
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Temp_Memory temp = begin_temp_memory(partition);
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stbtt_packedchar *chardata = push_array(partition, stbtt_packedchar, 256);
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i32 oversample = 2;
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i32 tex_width, tex_height;
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tex_width = pt_size*128*oversample;
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tex_height = pt_size*2*oversample;
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void *block = push_block(partition, tex_width * tex_height);
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if (!file.data){
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result = 0;
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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 = 0;
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}
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else{
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i32 ascent, descent, line_gap;
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f32 scale;
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stbtt_GetFontVMetrics(&font, &ascent, &descent, &line_gap);
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scale = stbtt_ScaleForPixelHeight(&font, (f32)pt_size);
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f32 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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i32 font_height = (i32)(scaled_ascent - scaled_descent + scaled_line_gap);
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stbtt_pack_context spc;
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if (stbtt_PackBegin(&spc, (u8*)block, tex_width, tex_height, tex_width, 1, partition)){
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stbtt_PackSetOversampling(&spc, oversample, oversample);
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if (stbtt_PackFontRange(&spc, (u8*)file.data, 0,
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STBTT_POINT_SIZE((f32)pt_size), 0, 128, chardata)){
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// do nothing
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}
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else{
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result = 0;
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}
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stbtt_PackEnd(&spc);
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}
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else{
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result = 0;
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}
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if (result){
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i32 max_advance = 0;
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for (u8 code_point = 0; code_point < 128; ++code_point){
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if (stbtt_FindGlyphIndex(&font, code_point) != 0){
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i32 adv = CEIL32(chardata[code_point].xadvance);
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if (max_advance < adv){
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||
|
|
max_advance = adv;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
*height = font_height;
|
||
|
|
*advance = max_advance - 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
system_free_memory(file.data);
|
||
|
|
}
|
||
|
|
|
||
|
|
end_temp_memory(temp);
|
||
|
|
|
||
|
|
return(result);
|
||
|
|
}
|
||
|
|
|
||
|
|
internal i32
|
||
|
|
draw_font_load(void *base_block, i32 size,
|
||
|
|
Render_Font *font_out,
|
||
|
|
char *filename_untranslated,
|
||
|
|
i32 pt_size,
|
||
|
|
i32 tab_width){
|
||
|
|
|
||
|
|
char space_[1024];
|
||
|
|
String filename = make_fixed_width_string(space_);
|
||
|
|
b32 translate_success = system_to_binary_path(&filename, filename_untranslated);
|
||
|
|
if (!translate_success) return 0;
|
||
|
|
|
||
|
|
i32 result = 1;
|
||
|
|
Data file;
|
||
|
|
file = system_load_file(filename.str);
|
||
|
|
|
||
|
|
Partition partition_ = partition_open(base_block, size);
|
||
|
|
Partition *partition = &partition_;
|
||
|
|
|
||
|
|
stbtt_packedchar *chardata = font_out->chardata;
|
||
|
|
|
||
|
|
i32 oversample = 2;
|
||
|
|
|
||
|
|
i32 tex_width, tex_height;
|
||
|
|
tex_width = pt_size*128*oversample;
|
||
|
|
tex_height = pt_size*2*oversample;
|
||
|
|
void *block = push_block(partition, tex_width * tex_height);
|
||
|
|
|
||
|
|
if (!file.data){
|
||
|
|
result = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
else{
|
||
|
|
stbtt_fontinfo font;
|
||
|
|
if (!stbtt_InitFont(&font, (u8*)file.data, 0)){
|
||
|
|
result = 0;
|
||
|
|
}
|
||
|
|
else{
|
||
|
|
i32 ascent, descent, line_gap;
|
||
|
|
f32 scale;
|
||
|
|
|
||
|
|
stbtt_GetFontVMetrics(&font, &ascent, &descent, &line_gap);
|
||
|
|
scale = stbtt_ScaleForPixelHeight(&font, (f32)pt_size);
|
||
|
|
|
||
|
|
f32 scaled_ascent, scaled_descent, scaled_line_gap;
|
||
|
|
|
||
|
|
scaled_ascent = scale*ascent;
|
||
|
|
scaled_descent = scale*descent;
|
||
|
|
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);
|
||
|
|
|
||
|
|
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, partition)){
|
||
|
|
stbtt_PackSetOversampling(&spc, oversample, oversample);
|
||
|
|
if (stbtt_PackFontRange(&spc, (u8*)file.data, 0,
|
||
|
|
STBTT_POINT_SIZE((f32)pt_size), 0, 128, chardata)){
|
||
|
|
// do nothing
|
||
|
|
}
|
||
|
|
else{
|
||
|
|
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);
|
||
|
|
|
||
|
|
font_out->chardata['\r'] = font_out->chardata[' '];
|
||
|
|
font_out->chardata['\n'] = font_out->chardata[' '];
|
||
|
|
font_out->chardata['\t'] = font_out->chardata[' '];
|
||
|
|
font_out->chardata['\t'].xadvance *= 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(font_out->chardata[code_point].xadvance);
|
||
|
|
if (max_advance < advance) max_advance = advance;
|
||
|
|
font_out->advance_data[code_point] = font_out->chardata[code_point].xadvance;
|
||
|
|
}
|
||
|
|
else if (code_point == '\r' || code_point == '\n' || code_point == '\t'){
|
||
|
|
font_out->advance_data[code_point] = font_out->chardata[code_point].xadvance;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
font_out->advance = max_advance - 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
system_free_memory(file.data);
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
internal
|
||
|
|
Release_Font_Sig(draw_release_font){
|
||
|
|
glDeleteTextures(1, &font->tex);
|
||
|
|
font->tex = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
// BOTTOM
|
||
|
|
|