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4coder/4ed_render_target.cpp

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/*
* Mr. 4th Dimention - Allen Webster
*
* 10.11.2017
*
* Render target function implementations.
*
*/
// TOP
internal void
draw__begin_new_group(Render_Target *target){
Render_Group *group = 0;
if (target->group_last != 0){
if (target->group_last->vertex_list.vertex_count == 0){
group = target->group_last;
}
}
if (group == 0){
group = push_array_zero(&target->arena, Render_Group, 1);
sll_queue_push(target->group_first, target->group_last, group);
}
group->face_id = target->current_face_id;
group->clip_box = target->current_clip_box;
}
internal Render_Vertex_Array_Node*
draw__extend_group_vertex_memory(Arena *arena, Render_Vertex_List *list, i32 size){
Render_Vertex_Array_Node *node = push_array_zero(arena, Render_Vertex_Array_Node, 1);
sll_queue_push(list->first, list->last, node);
node->vertices = push_array(arena, Render_Vertex, size);
node->vertex_max = size;
return(node);
}
internal void
draw__write_vertices_in_current_group(Render_Target *target, Render_Vertex *vertices, i32 count){
if (count > 0){
Render_Group *group = target->group_last;
if (group == 0){
draw__begin_new_group(target);
group = target->group_last;
}
Render_Vertex_List *list = &group->vertex_list;
Render_Vertex_Array_Node *last = list->last;
Render_Vertex *tail_vertex = 0;
i32 tail_count = 0;
if (last != 0){
tail_vertex = last->vertices + last->vertex_count;
tail_count = last->vertex_max - last->vertex_count;
}
i32 base_vertex_max = 64;
i32 transfer_count = clamp_top(count, tail_count);
if (transfer_count > 0){
block_copy_dynamic_array(tail_vertex, vertices, transfer_count);
last->vertex_count += transfer_count;
list->vertex_count += transfer_count;
base_vertex_max = last->vertex_max;
}
i32 count_left_over = count - transfer_count;
if (count_left_over > 0){
Render_Vertex *vertices_left_over = vertices + transfer_count;
i32 next_node_size = (base_vertex_max + count_left_over)*2;
Render_Vertex_Array_Node *memory = draw__extend_group_vertex_memory(&target->arena, list, next_node_size);
block_copy_dynamic_array(memory->vertices, vertices_left_over, count_left_over);
memory->vertex_count += count_left_over;
list->vertex_count += count_left_over;
}
}
}
internal void
draw__set_face_id(Render_Target *target, Face_ID face_id){
if (target->current_face_id != face_id){
if (target->current_face_id != 0){
target->current_face_id = face_id;
draw__begin_new_group(target);
}
else{
target->current_face_id = face_id;
for (Render_Group *group = target->group_first;
group != 0;
group = group->next){
group->face_id = face_id;
}
}
}
}
////////////////////////////////
internal Rect_f32
draw_set_clip(Render_Target *target, Rect_f32 clip_box){
Rect_f32 result = target->current_clip_box;
if (target->current_clip_box != clip_box){
target->current_clip_box = clip_box;
draw__begin_new_group(target);
}
return(result);
}
internal void
begin_frame(Render_Target *target, void *font_set){
linalloc_clear(&target->arena);
target->group_first = 0;
target->group_last = 0;
target->current_face_id = 0;
target->current_clip_box = Rf32(0, 0, (f32)target->width, (f32)target->height);
target->font_set = font_set;
}
internal void
begin_render_section(Render_Target *target, i32 frame_index, f32 literal_dt, f32 animation_dt){
target->frame_index = frame_index;
target->literal_dt = literal_dt;
target->animation_dt = animation_dt;
}
internal void
end_render_section(Render_Target *target){
}
////////////////////////////////
internal void
draw_rectangle_outline(Render_Target *target, Rect_f32 rect, f32 roundness, f32 thickness, u32 color){
if (roundness < epsilon_f32){
roundness = 0.f;
}
thickness = clamp_bot(1.f, thickness);
f32 half_thickness = thickness*0.5f;
Render_Vertex vertices[6] = {};
vertices[0].xy = V2f32(rect.x0, rect.y0);
vertices[1].xy = V2f32(rect.x1, rect.y0);
vertices[2].xy = V2f32(rect.x0, rect.y1);
vertices[3].xy = V2f32(rect.x1, rect.y0);
vertices[4].xy = V2f32(rect.x0, rect.y1);
vertices[5].xy = V2f32(rect.x1, rect.y1);
Vec2_f32 center = rect_center(rect);
for (i32 i = 0; i < ArrayCount(vertices); i += 1){
vertices[i].uvw = V3f32(center.x, center.y, roundness);
vertices[i].color = color;
vertices[i].half_thickness = half_thickness;
}
draw__write_vertices_in_current_group(target, vertices, ArrayCount(vertices));
}
internal void
draw_rectangle(Render_Target *target, Rect_f32 rect, f32 roundness, u32 color){
Vec2_f32 dim = rect_dim(rect);
draw_rectangle_outline(target, rect, roundness, Max(dim.x, dim.y), color);
}
internal void
draw_font_glyph(Render_Target *target, Face *face, u32 codepoint, Vec2_f32 p,
ARGB_Color color, Glyph_Flag flags, Vec2_f32 x_axis){
draw__set_face_id(target, face->id);
u16 glyph_index = 0;
if (!codepoint_index_map_read(&face->advance_map.codepoint_to_index,
codepoint, &glyph_index)){
glyph_index = 0;
}
Glyph_Bounds bounds = face->bounds[glyph_index];
Vec3_f32 texture_dim = face->texture_dim;
Render_Vertex vertices[6] = {};
Rect_f32 uv = bounds.uv;
vertices[0].uvw = V3f32(uv.x0, uv.y0, bounds.w);
vertices[1].uvw = V3f32(uv.x1, uv.y0, bounds.w);
vertices[2].uvw = V3f32(uv.x0, uv.y1, bounds.w);
vertices[5].uvw = V3f32(uv.x1, uv.y1, bounds.w);
Vec2_f32 y_axis = V2f32(-x_axis.y, x_axis.x);
Vec2_f32 x_min = bounds.xy_off.x0*x_axis;
Vec2_f32 x_max = bounds.xy_off.x1*x_axis;
Vec2_f32 y_min = bounds.xy_off.y0*y_axis;
Vec2_f32 y_max = bounds.xy_off.y1*y_axis;
Vec2_f32 p_x_min = p + x_min;
Vec2_f32 p_x_max = p + x_max;
vertices[0].xy = p_x_min + y_min;
vertices[1].xy = p_x_max + y_min;
vertices[2].xy = p_x_min + y_max;
vertices[5].xy = p_x_max + y_max;
#if 0
Vec2_f32 xy_min = p + bounds.xy_off.x0*x_axis + bounds.xy_off.y0*y_axis;
Vec2_f32 xy_max = p + bounds.xy_off.x1*x_axis + bounds.xy_off.y1*y_axis;
vertices[0].xy = V2f32(xy_min.x, xy_min.y);
vertices[1].xy = V2f32(xy_max.x, xy_min.y);
vertices[2].xy = V2f32(xy_min.x, xy_max.y);
vertices[5].xy = V2f32(xy_max.x, xy_max.y);
#endif
#if 0
if (!HasFlag(flags, GlyphFlag_Rotate90)){
Rect_f32 xy = Rf32(p + bounds.xy_off.p0, p + bounds.xy_off.p1);
vertices[0].xy = V2f32(xy.x0, xy.y1);
vertices[0].uvw = V3f32(uv.x0, uv.y1, bounds.w);
vertices[1].xy = V2f32(xy.x1, xy.y1);
vertices[1].uvw = V3f32(uv.x1, uv.y1, bounds.w);
vertices[2].xy = V2f32(xy.x0, xy.y0);
vertices[2].uvw = V3f32(uv.x0, uv.y0, bounds.w);
vertices[5].xy = V2f32(xy.x1, xy.y0);
vertices[5].uvw = V3f32(uv.x1, uv.y0, bounds.w);
}
else{
Rect_f32 xy = Rf32(p.x - bounds.xy_off.y1, p.y + bounds.xy_off.x0,
p.x - bounds.xy_off.y0, p.y + bounds.xy_off.x1);
vertices[0].xy = V2f32(xy.x0, xy.y1);
vertices[0].uvw = V3f32(uv.x1, uv.y1, bounds.w);
vertices[1].xy = V2f32(xy.x1, xy.y1);
vertices[1].uvw = V3f32(uv.x1, uv.y0, bounds.w);
vertices[2].xy = V2f32(xy.x0, xy.y0);
vertices[2].uvw = V3f32(uv.x0, uv.y1, bounds.w);
vertices[5].xy = V2f32(xy.x1, xy.y0);
vertices[5].uvw = V3f32(uv.x0, uv.y0, bounds.w);
}
#endif
vertices[3] = vertices[1];
vertices[4] = vertices[2];
for (i32 i = 0; i < ArrayCount(vertices); i += 1){
vertices[i].color = color;
vertices[i].half_thickness = 0.f;
}
draw__write_vertices_in_current_group(target, vertices, ArrayCount(vertices));
}
////////////////////////////////
internal Vec2_f32
floor32(Vec2_f32 point){
point.x = f32_floor32(point.x);
point.y = f32_floor32(point.y);
return(point);
}
internal f32
draw_string(Render_Target *target, Face *face, String_Const_u8 string, Vec2_f32 point,
ARGB_Color color, u32 flags, Vec2_f32 delta){
f32 total_delta = 0.f;
if (face != 0){
point = floor32(point);
f32 byte_advance = face->metrics.byte_advance;
f32 *byte_sub_advances = face->metrics.byte_sub_advances;
u8 *str = (u8*)string.str;
u8 *str_end = str + string.size;
Translation_State tran = {};
Translation_Emits emits = {};
for (u32 i = 0; str < str_end; ++str, ++i){
translating_fully_process_byte(&tran, *str, i, (i32)string.size, &emits);
for (TRANSLATION_DECL_EMIT_LOOP(J, emits)){
TRANSLATION_DECL_GET_STEP(step, behavior, J, emits);
if (behavior.do_codepoint_advance){
u32 codepoint = step.value;
if (color != 0){
u32 draw_codepoint = step.value;
if (draw_codepoint == '\t'){
draw_codepoint = ' ';
}
draw_font_glyph(target, face, draw_codepoint, point, color, flags, delta);
}
local_const f32 internal_tab_width = 4.f;
f32 d = font_get_glyph_advance(&face->advance_map, &face->metrics, codepoint, internal_tab_width);
point += d*delta;
total_delta += d;
}
else if (behavior.do_number_advance){
u8 n = (u8)(step.value);
if (color != 0){
u8 cs[3];
cs[0] = '\\';
u8 nh = (n >> 4);
u8 nl = (n & 0xF);
u8 ch = '0' + nh;
u8 cl = '0' + nl;
if (nh > 0x9){
ch = ('A' - 0xA) + nh;
}
if (nl > 0x9){
cl = ('A' - 0xA) + nl;
}
cs[1] = ch;
cs[2] = cl;
Vec2_f32 pp = point;
for (u32 j = 0; j < 3; ++j){
draw_font_glyph(target, face, cs[j], pp, color, flags, delta);
pp += delta*byte_sub_advances[j];
}
}
point += byte_advance*delta;
total_delta += byte_advance;
}
}
}
}
return(total_delta);
}
internal f32
draw_string(Render_Target *target, Face *face, String_Const_u8 string, Vec2_f32 point, u32 color){
return(draw_string(target, face, string, point, color, 0, V2f32(1.f, 0.f)));
}
internal f32
draw_string(Render_Target *target, Face *face, u8 *str, Vec2_f32 point, u32 color, u32 flags, Vec2_f32 delta){
return(draw_string(target, face, SCu8(str), point, color, flags, delta));
}
internal f32
draw_string(Render_Target *target, Face *face, u8 *str, Vec2_f32 point, u32 color){
return(draw_string(target, face, SCu8(str), point, color, 0, V2f32(1.f, 0.f)));
}
internal f32
font_string_width(Render_Target *target, Face *face, String_Const_u8 str){
return(draw_string(target, face, str, V2f32(0, 0), 0, 0, V2f32(0, 0)));
}
internal f32
font_string_width(Render_Target *target, Face *face, u8 *str){
return(draw_string(target, face, SCu8(str), V2f32(0, 0), 0, 0, V2f32(0, 0)));
}
// BOTTOM
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