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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_sharp(Render_Target *target, Rect_f32 rect, u32 color){
Render_Vertex vertices[6] = {};
vertices[0].xy = V2(rect.x0, rect.y0);
vertices[1].xy = V2(rect.x1, rect.y0);
vertices[2].xy = V2(rect.x0, rect.y1);
vertices[3].xy = V2(rect.x1, rect.y0);
vertices[4].xy = V2(rect.x0, rect.y1);
vertices[5].xy = V2(rect.x1, rect.y1);
Vec4_f32 c = unpack_color4(color);
for (i32 i = 0; i < 6; i += 1){
vertices[i].color = c;
}
draw__write_vertices_in_current_group(target, vertices, 6);
}
global b32 filled_round_corner = false;
global_const i32 baked_tri_count = 12;
global Vec2_f32 baked_round_corner[baked_tri_count + 1] = {};
internal void
bake_round_corner(void){
if (!filled_round_corner){
filled_round_corner = true;
Range_f32 theta = If32(0.f, half_pi_f32);
for (i32 k = 0; k < baked_tri_count + 1; k += 1){
f32 t = ((f32)k)/((f32)baked_tri_count);
f32 theta1 = lerp(t, theta);
baked_round_corner[k] = V2f32(cos_f32(theta1), sin_f32(theta1));
}
}
}
internal void
draw_round_corners(Render_Target *target, Rect_f32 mid, f32 roundness, u32 color){
bake_round_corner();
for (i32 i = 0; i < 2; i += 1){
for (i32 j = 0; j < 2; j += 1){
Vec2_f32 d = {};
Vec2_f32 p = {};
if (i == 0){
if (j == 0){
p = V2f32(mid.x0, mid.y0);
d = V2f32(-1.f, -1.f);
}
else{
p = V2f32(mid.x1, mid.y0);
d = V2f32( 1.f, -1.f);
}
}
else{
if (j == 0){
p = V2f32(mid.x0, mid.y1);
d = V2f32(-1.f, 1.f);
}
else{
p = V2f32(mid.x1, mid.y1);
d = V2f32( 1.f, 1.f);
}
}
d *= roundness;
Render_Vertex vertices[baked_tri_count*3] = {};
i32 m = 0;
for (i32 k = 0; k < baked_tri_count; k += 1){
Vec2_f32 p0 = baked_round_corner[k + 0];
Vec2_f32 p1 = baked_round_corner[k + 1];
vertices[m].xy = p;
m += 1;
vertices[m].xy = p + hadamard(p0, d);
m += 1;
vertices[m].xy = p + hadamard(p1, d);
m += 1;
}
Vec4_f32 c = unpack_color4(color);
for (i32 k = 0; k < ArrayCount(vertices); k += 1){
vertices[k].color = c;
}
draw__write_vertices_in_current_group(target, vertices, ArrayCount(vertices));
}
}
}
internal void
draw_rectangle(Render_Target *target, Rect_f32 rect, f32 roundness, u32 color){
if (roundness < epsilon_f32){
draw_rectangle_sharp(target, rect, color);
}
else{
Vec2_f32 dim = rect_dim(rect);
Vec2_f32 half_dim = dim*0.5f;
roundness = min(roundness, half_dim.x);
roundness = min(roundness, half_dim.y);
Rect_f32 mid = rect_inner(rect, roundness);
b32 has_x = (mid.x1 > mid.x0);
b32 has_y = (mid.y1 > mid.y0);
if (has_x && has_y){
draw_rectangle_sharp(target, mid, color);
}
if (has_x){
draw_rectangle_sharp(target,
Rf32(mid.x0, rect.y0, mid.x1, mid.y0),
color);
draw_rectangle_sharp(target,
Rf32(mid.x0, mid.y0, mid.x1, rect.y1),
color);
}
if (has_y){
draw_rectangle_sharp(target,
Rf32(rect.x0, mid.y0, mid.x0, mid.y1),
color);
draw_rectangle_sharp(target,
Rf32(mid.x1, mid.y0, rect.x1, mid.y1),
color);
}
draw_round_corners(target, mid, roundness, color);
}
}
internal void
draw_rectangle_outline(Render_Target *target, Rect_f32 rect, f32 roundness, f32 thickness, u32 color){
Vec2_f32 dim = rect_dim(rect);
Vec2_f32 half_dim = dim*0.5f;
f32 max_thickness = min(half_dim.x, half_dim.y);
thickness = clamp(1.f, thickness, max_thickness);
Rect_f32 inner = rect_inner(rect, thickness);
if (roundness < epsilon_f32){
Render_Vertex vertices[24] = {};
vertices[ 0].xy = V2(rect.x0, rect.y0);
vertices[ 1].xy = V2(inner.x0, inner.y0);
vertices[ 2].xy = V2(rect.x1, rect.y0);
vertices[ 3].xy = V2(inner.x0, inner.y0);
vertices[ 4].xy = V2(rect.x1, rect.y0);
vertices[ 5].xy = V2(inner.x1, inner.y0);
vertices[ 6].xy = V2(rect.x1, rect.y0);
vertices[ 7].xy = V2(inner.x1, inner.y0);
vertices[ 8].xy = V2(rect.x1, rect.y1);
vertices[ 9].xy = V2(inner.x1, inner.y0);
vertices[10].xy = V2(rect.x1, rect.y1);
vertices[11].xy = V2(inner.x1, inner.y1);
vertices[12].xy = V2(rect.x1, rect.y1);
vertices[13].xy = V2(inner.x1, inner.y1);
vertices[14].xy = V2(rect.x0, rect.y1);
vertices[15].xy = V2(inner.x1, inner.y1);
vertices[16].xy = V2(rect.x0, rect.y1);
vertices[17].xy = V2(inner.x0, inner.y1);
vertices[18].xy = V2(rect.x0, rect.y1);
vertices[19].xy = V2(inner.x0, inner.y1);
vertices[20].xy = V2(rect.x0, rect.y0);
vertices[21].xy = V2(inner.x0, inner.y1);
vertices[22].xy = V2(rect.x0, rect.y0);
vertices[23].xy = V2(inner.x0, inner.y0);
Vec4_f32 c = unpack_color4(color);
for (i32 i = 0; i < ArrayCount(vertices); i += 1){
vertices[i].color = c;
}
draw__write_vertices_in_current_group(target, vertices, ArrayCount(vertices));
}
else{
roundness = min(roundness, half_dim.x);
roundness = min(roundness, half_dim.y);
Rect_f32 mid = rect_inner(rect, roundness);
b32 has_x = (mid.x1 > mid.x0);
b32 has_y = (mid.y1 > mid.y0);
if (has_x){
draw_rectangle_sharp(target,
Rf32(mid.x0, rect.y0, mid.x1, inner.y0),
color);
draw_rectangle_sharp(target,
Rf32(mid.x0, inner.y1, mid.x1, rect.y1),
color);
}
if (has_y){
draw_rectangle_sharp(target,
Rf32(rect.x0, mid.y0, inner.x0, mid.y1),
color);
draw_rectangle_sharp(target,
Rf32(inner.x1, mid.y0, rect.x1, mid.y1),
color);
}
if (roundness <= thickness){
draw_round_corners(target, mid, roundness, color);
}
else{
bake_round_corner();
for (i32 i = 0; i < 2; i += 1){
for (i32 j = 0; j < 2; j += 1){
Vec2_f32 d = {};
Vec2_f32 p = {};
if (i == 0){
if (j == 0){
p = V2f32(mid.x0, mid.y0);
d = V2f32(-1.f, -1.f);
}
else{
p = V2f32(mid.x1, mid.y0);
d = V2f32( 1.f, -1.f);
}
}
else{
if (j == 0){
p = V2f32(mid.x0, mid.y1);
d = V2f32(-1.f, 1.f);
}
else{
p = V2f32(mid.x1, mid.y1);
d = V2f32( 1.f, 1.f);
}
}
Vec2_f32 d1 = d*roundness;
Vec2_f32 d2 = d*(roundness - thickness);
Render_Vertex vertices[baked_tri_count*6] = {};
i32 m = 0;
for (i32 k = 0; k < baked_tri_count; k += 1){
Vec2_f32 p0 = baked_round_corner[k + 0];
Vec2_f32 p1 = baked_round_corner[k + 1];
vertices[m].xy = p + hadamard(p0, d1);
m += 1;
vertices[m].xy = p + hadamard(p0, d2);
m += 1;
vertices[m].xy = p + hadamard(p1, d1);
m += 1;
vertices[m].xy = p + hadamard(p0, d2);
m += 1;
vertices[m].xy = p + hadamard(p1, d1);
m += 1;
vertices[m].xy = p + hadamard(p1, d2);
m += 1;
}
Vec4_f32 c = unpack_color4(color);
for (i32 k = 0; k < ArrayCount(vertices); k += 1){
vertices[k].color = c;
}
draw__write_vertices_in_current_group(target, vertices, ArrayCount(vertices));
}
}
}
}
}
internal void
draw_font_glyph(Render_Target *target, Face *face, u32 codepoint, f32 x, f32 y, u32 color, u32 flags){
draw__set_face_id(target, face->id);
u16 glyph_index = 0;
if (!codepoint_index_map_read(&face->codepoint_to_index_map, codepoint, &glyph_index)){
glyph_index = 0;
}
Glyph_Bounds bounds = face->bounds[glyph_index];
Vec3_f32 texture_dim = face->texture_dim;
Rect_f32 uv = bounds.uv;
Render_Vertex vertices[6] = {};
if (!HasFlag(flags, GlyphFlag_Rotate90)){
Rect_f32 xy = Rf32(x + bounds.xy_off.x0, y + bounds.xy_off.y0,
x + bounds.xy_off.x1, y + bounds.xy_off.y1);
vertices[0].xy = V2(xy.x0, xy.y1); vertices[0].uvw = V3(uv.x0, uv.y1, bounds.w);
vertices[1].xy = V2(xy.x1, xy.y1); vertices[1].uvw = V3(uv.x1, uv.y1, bounds.w);
vertices[2].xy = V2(xy.x0, xy.y0); vertices[2].uvw = V3(uv.x0, uv.y0, bounds.w);
vertices[5].xy = V2(xy.x1, xy.y0); vertices[5].uvw = V3(uv.x1, uv.y0, bounds.w);
}
else{
Rect_f32 xy = Rf32(x - bounds.xy_off.y1, y + bounds.xy_off.x0,
x - bounds.xy_off.y0, y + bounds.xy_off.x1);
vertices[0].xy = V2(xy.x0, xy.y1); vertices[0].uvw = V3(uv.x1, uv.y1, bounds.w);
vertices[1].xy = V2(xy.x1, xy.y1); vertices[1].uvw = V3(uv.x1, uv.y0, bounds.w);
vertices[2].xy = V2(xy.x0, xy.y0); vertices[2].uvw = V3(uv.x0, uv.y1, bounds.w);
vertices[5].xy = V2(xy.x1, xy.y0); vertices[5].uvw = V3(uv.x0, uv.y0, bounds.w);
}
vertices[3] = vertices[1];
vertices[4] = vertices[2];
Vec4 c = unpack_color4(color);
for (i32 i = 0; i < 6; i += 1){
vertices[i].color = c;
}
draw__write_vertices_in_current_group(target, vertices, 6);
}
////////////////////////////////
internal Vec2
snap_point_to_boundary(Vec2 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 point, u32 color, u32 flags, Vec2 delta){
f32 total_delta = 0.f;
if (face != 0){
point = snap_point_to_boundary(point);
f32 byte_advance = face->byte_advance;
f32 *byte_sub_advances = face->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){
draw_font_glyph(target, face, codepoint, point.x, point.y, color, flags);
}
f32 d = font_get_glyph_advance(face, codepoint);
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 pp = point;
for (u32 j = 0; j < 3; ++j){
draw_font_glyph(target, face, cs[j], pp.x, pp.y, color, flags);
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 point, u32 color){
return(draw_string(target, face, string, point, color, 0, V2(1.f, 0.f)));
}
internal f32
draw_string(Render_Target *target, Face *face, u8 *str, Vec2 point,
u32 color, u32 flags, Vec2 delta){
return(draw_string(target, face, SCu8(str), point, color, flags, delta));
}
internal f32
draw_string(Render_Target *target, Face *face, u8 *str, Vec2 point,
u32 color){
return(draw_string(target, face, SCu8(str), point, color, 0, V2(1.f, 0.f)));
}
internal f32
font_string_width(Render_Target *target, Face *face, String_Const_u8 str){
return(draw_string(target, face, str, V2(0, 0), 0, 0, V2(0, 0)));
}
internal f32
font_string_width(Render_Target *target, Face *face, u8 *str){
return(draw_string(target, face, SCu8(str), V2(0, 0), 0, 0, V2(0, 0)));
}
// BOTTOM
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