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4coder/4ed_rendering.cpp

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/*
* Mr. 4th Dimention - Allen Webster
*
* 12.17.2014
*
* Rendering layer for project codename "4ed"
*
*/
// TOP
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);
}
}
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_set_clip(target, clip_box);
}
internal void
draw_pop_clip(Render_Target *target){
Assert(target->clip_top > 0);
--target->clip_top;
draw_set_clip(target, target->clip_boxes[target->clip_top]);
}
#define PutStruct(s,x) *(s*)(target->push_buffer + target->size) = x; target->size += sizeof(s)
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);
}
#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();
}
inline void
private_draw_glyph(Render_Target *target, Render_Font *font,
u16 character, f32 x, f32 y, u32 color){
f32 x_shift, y_shift;
x_shift = 0;
y_shift = (f32)font->ascent;
x += x_shift;
y += y_shift;
stbtt_aligned_quad q;
stbtt_GetBakedQuadUnrounded(font->chardata, font->tex_width, font->tex_height,
character, &x, &y, &q, 1);
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, u16 character,
f32 x, f32 y, f32 advance, u32 color){
f32 x_shift, y_shift;
i32 left = font->chardata[character].x0;
i32 right = font->chardata[character].x1;
i32 width = (right - left);
x_shift = (f32)(advance - width) * .5f - font->chardata[character].xoff;
y_shift = (f32)font->ascent;
x += x_shift;
y += y_shift;
stbtt_aligned_quad q;
stbtt_GetBakedQuadUnrounded(font->chardata, font->tex_width, font->tex_height, character, &x, &y, &q, 1);
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, u16 character,
real32 x, real32 y, u32 color){
private_draw_glyph_mono(target, font, character, x, y, (f32)font->advance, color);
}
internal void
launch_rendering(Render_Target *target){
byte *cursor = target->push_buffer;
byte *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 = glyph->font_id;
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 = glyph->font_id;
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 = glyph->font_id;
private_draw_glyph_mono(target, font, glyph->character,
glyph->pos.x, glyph->pos.y,
glyph->advance, glyph->color);
}break;
}
}
}
#undef ExtractStruct
internal i32
draw_font_load(System_Functions *system,
Render_Font *font_out,
char *filename,
i32 pt_size,
void *font_block,
i32 font_block_size,
i32 *memory_used_out,
i32 tab_width){
i32 result = 1;
Data file;
file = system->load_file(filename);
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;
real32 scale;
stbtt_GetFontVMetrics(&font, &ascent, &descent, &line_gap);
scale = stbtt_ScaleForPixelHeight(&font, (real32)pt_size);
real32 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);
u8 *memory_cursor = (u8*)font_block;
Assert(pt_size*pt_size*128 <= font_block_size);
i32 tex_width, tex_height;
tex_width = pt_size*128;
tex_height = pt_size*2;
font_out->tex_width = tex_width;
font_out->tex_height = tex_height;
if (stbtt_BakeFontBitmap((u8*)file.data, 0, (real32)pt_size,
memory_cursor, tex_width, tex_height, 0, 128, font_out->chardata) <= 0){
result = 0;
}
else{
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, memory_cursor);
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 (u16 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;
}
}
font_out->advance = max_advance - 1;
}
system->free_file(file);
}
return result;
}
#if 0
internal void
draw_rectangle(Render_Target *target, i32_Rect rect, u32 color){
draw_set_color(target, color);
draw_bind_texture(target, 0);
glBegin(GL_QUADS);
{
glVertex2i(rect.x0, rect.y0);
glVertex2i(rect.x0, rect.y1);
glVertex2i(rect.x1, rect.y1);
glVertex2i(rect.x1, rect.y0);
}
glEnd();
}
internal void
draw_triangle_3corner(Render_Target *target,
real32 x0, real32 y0,
real32 x1, real32 y1,
real32 x2, real32 y2,
u32 color){
draw_set_color(target, color);
draw_bind_texture(target, 0);
glBegin(GL_TRIANGLES);
{
glVertex2f(x0, y0);
glVertex2f(x1, y1);
glVertex2f(x2, y2);
}
glEnd();
}
inline void
draw_gradient_2corner_clipped(Render_Target *target, real32 l, real32 t, real32 r, real32 b,
Vec4 color_left, Vec4 color_right){
draw_gradient_2corner_clipped(target, f32R(l,t,r,b), color_left, color_right);
}
inline void
draw_rectangle_outline(Render_Target *target, i32_Rect rect, u32 color){
draw_rectangle_outline(target, f32R(rect), color);
}
internal void
draw_margin(Render_Target *target, i32_Rect outer, i32_Rect inner, u32 color){
draw_rectangle(target, i32R(outer.x0, outer.y0, outer.x1, inner.y0), color);
draw_rectangle(target, i32R(outer.x0, inner.y1, outer.x1, outer.y1), color);
draw_rectangle(target, i32R(outer.x0, inner.y0, inner.x0, inner.y1), color);
draw_rectangle(target, i32R(inner.x1, inner.y0, outer.x1, inner.y1), color);
}
inline internal i32
font_predict_size(i32 pt_size){
return pt_size*pt_size*128;
}
internal i32
font_load(System_Functions *system,
Render_Font *font_out, char *filename, i32 pt_size,
void *font_block, i32 font_block_size,
i32 *memory_used_out, i32 tab_width){
i32 result = 1;
File_Data file;
file = system->load_file(filename);
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;
real32 scale;
stbtt_GetFontVMetrics(&font, &ascent, &descent, &line_gap);
scale = stbtt_ScaleForPixelHeight(&font, (real32)pt_size);
real32 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);
u8 *memory_cursor = (u8*)font_block;
Assert(pt_size*pt_size*128 <= font_block_size);
i32 tex_width, tex_height;
tex_width = pt_size*128;
tex_height = pt_size*2;
font_out->tex_width = tex_width;
font_out->tex_height = tex_height;
if (stbtt_BakeFontBitmap((u8*)file.data, 0, (real32)pt_size,
memory_cursor, tex_width, tex_height, 0, 128, font_out->chardata) <= 0){
result = 0;
}
else{
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, memory_cursor);
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 (u16 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;
}
}
font_out->advance = max_advance - 1;
}
system->free_file(file);
}
return result;
}
internal void
font_set_tabwidth(Render_Font *font, i32 tab_width){
font->chardata['\t'].xadvance *= font->chardata[' '].xadvance * tab_width;
}
inline real32
font_get_glyph_width(Render_Font *font, u16 character){
return font->chardata[character].xadvance;
}
internal real32
font_string_width(Render_Font *font, char *str){
real32 x = 0;
for (i32 i = 0; str[i]; ++i){
x += font_get_glyph_width(font, str[i]);
}
return x;
}
internal i32
draw_string(Render_Target *target, Render_Font *font, char *str,
i32 x_, i32 y, u32 color){
real32 x = (real32)x_;
for (i32 i = 0; str[i]; ++i){
char c = str[i];
font_draw_glyph(target, font, c,
x, (real32)y, color);
x += font_get_glyph_width(font, c);
}
return CEIL32(x);
}
internal real32
draw_string_mono(Render_Target *target, Render_Font *font, char *str,
real32 x, real32 y, real32 advance, u32 color){
for (i32 i = 0; str[i]; ++i){
font_draw_glyph_mono(target, font, str[i],
x, y, advance, color);
x += advance;
}
return x;
}
internal i32
draw_string(Render_Target *target, Render_Font *font, String str,
i32 x_, i32 y, u32 color){
real32 x = (real32)x_;
for (i32 i = 0; i < str.size; ++i){
char c = str.str[i];
font_draw_glyph(target, font, c,
x, (real32)y, color);
x += font_get_glyph_width(font, c);
}
return CEIL32(x);
}
internal real32
draw_string_mono(Render_Target *target, Render_Font *font, String str,
real32 x, real32 y, real32 advance, u32 color){
for (i32 i = 0; i < str.size; ++i){
font_draw_glyph_mono(target, font, str.str[i],
x, y, advance, color);
x += advance;
}
return x;
}
internal real32
font_get_max_width(Render_Font *font, char *characters){
stbtt_bakedchar *chardata = font->chardata;
real32 cx, x = 0;
for (i32 i = 0; characters[i]; ++i){
cx = chardata[characters[i]].xadvance;
if (x < cx) x = cx;
}
return x;
}
internal real32
font_get_string_width(Render_Font *font, String string){
real32 result = 0;
for (i32 i = 0; i < string.size; ++i){
font_get_glyph_width(font, string.str[i]);
}
return result;
}
#endif
// BOTTOM
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