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#include "../../include/mgl/graphics/text.h"
#include "../../include/mgl/graphics/font.h"
#include "../../include/mgl/system/utf8.h"
#include "../../include/mgl/mgl.h"
#include <stdio.h>
#define TAB_WIDTH 4
static float max_float(float a, float b) {
return a >= b ? a : b;
}
static mgl_vec2f mgl_text_calculate_bounds(mgl_text *self) {
mgl_vec2f bounds;
bounds.x = 0.0f;
bounds.y = self->font->character_size;
/* TODO: Combine this with the loop in mgl_text_draw */
mgl_font_glyph glyph;
float width = 0.0f;
for(size_t i = 0; i < self->text_size;) {
unsigned char *cp = (unsigned char*)&self->text[i];
uint32_t codepoint;
size_t clen;
if(!mgl_utf8_decode(cp, self->text_size - i, &codepoint, &clen)) {
codepoint = *cp;
clen = 1;
}
if(codepoint == '\t') {
if(mgl_font_get_glyph(self->font, ' ', &glyph) == 0) {
width += (glyph.advance * TAB_WIDTH);
bounds.x = max_float(bounds.x, width);
}
} else if(codepoint == '\n') {
width = 0.0f;
bounds.y += self->font->character_size;
} else {
if(mgl_font_get_glyph(self->font, codepoint, &glyph) == 0) {
width += glyph.advance;
bounds.x = max_float(bounds.x, width);
}
}
i += clen;
}
return bounds;
}
void mgl_text_init(mgl_text *self, mgl_font *font, const char *str, size_t str_size) {
self->font = font;
self->color = (mgl_color){ 255, 255, 255, 255 };
self->position = (mgl_vec2f){ 0.0f, 0.0f };
self->text = NULL;
self->text_size = 0;
mgl_text_set_string(self, str, str_size);
}
void mgl_text_deinit(mgl_text *self) {
self->font = NULL;
self->position = (mgl_vec2f){ 0.0f, 0.0f };
self->text = NULL;
self->text_size = 0;
self->bounds = (mgl_vec2f){ 0.0f, 0.0f };
}
void mgl_text_set_string(mgl_text *self, const char *str, size_t str_size) {
self->text = str;
self->text_size = str_size;
if(self->text && self->text_size > 0 && self->font)
self->bounds = mgl_text_calculate_bounds(self);
else
self->bounds = (mgl_vec2f){ 0.0f, 0.0f };
}
void mgl_text_set_font(mgl_text *self, mgl_font *font) {
self->font = font;
if(self->font) {
if(self->bounds.x < 0.001f && self->bounds.y < 0.001f && self->text && self->text_size > 0)
self->bounds = mgl_text_calculate_bounds(self);
} else {
self->bounds = (mgl_vec2f){ 0.0f, 0.0f };
}
}
void mgl_text_set_position(mgl_text *self, mgl_vec2f position) {
self->position = position;
}
void mgl_text_set_color(mgl_text *self, mgl_color color) {
self->color = color;
}
mgl_vec2f mgl_text_get_bounds(const mgl_text *self) {
return self->bounds;
}
static void mgl_text_draw_glyph(mgl_context *context, mgl_font_glyph *glyph, mgl_vec2f position) {
context->gl.glTexCoord2f(glyph->texture_position.x, glyph->texture_position.y);
context->gl.glVertex3f(position.x + glyph->position.x, position.y + glyph->position.y, 0.0f);
context->gl.glTexCoord2f(glyph->texture_position.x + glyph->texture_size.x, glyph->texture_position.y);
context->gl.glVertex3f(position.x + glyph->position.x + glyph->size.x, position.y + glyph->position.y, 0.0f);
context->gl.glTexCoord2f(glyph->texture_position.x + glyph->texture_size.x, glyph->texture_position.y + glyph->texture_size.y);
context->gl.glVertex3f(position.x + glyph->position.x + glyph->size.x, position.y + glyph->position.y + glyph->size.y, 0.0f);
context->gl.glTexCoord2f(glyph->texture_position.x, glyph->texture_position.y + glyph->texture_size.y);
context->gl.glVertex3f(position.x + glyph->position.x, position.y + glyph->position.y + glyph->size.y, 0.0f);
}
/* TODO: Use opengl buffer object instead */
/* TODO: Cache texture bind to not bind texture if its already bound and do not bind texture 0 */
void mgl_text_draw(mgl_context *context, mgl_text *text) {
if(!text->text || text->text_size == 0 || !text->font)
return;
mgl_font_glyph glyph;
mgl_vec2f position = text->position;
position.y += text->font->character_size;
context->gl.glColor4ub(text->color.r, text->color.g, text->color.b, text->color.a);
context->gl.glBindTexture(GL_TEXTURE_2D, text->font->texture.id);
context->gl.glBegin(GL_QUADS);
for(size_t i = 0; i < text->text_size;) {
unsigned char *cp = (unsigned char*)&text->text[i];
uint32_t codepoint;
size_t clen;
if(!mgl_utf8_decode(cp, text->text_size - i, &codepoint, &clen)) {
codepoint = *cp;
clen = 1;
}
if(codepoint == '\t') {
if(mgl_font_get_glyph(text->font, ' ', &glyph) == 0) {
position.x += (glyph.advance * TAB_WIDTH);
}
} else if(codepoint == '\n') {
position.x = text->position.x;
position.y += text->font->character_size;
} else {
if(mgl_font_get_glyph(text->font, codepoint, &glyph) == 0) {
mgl_text_draw_glyph(context, &glyph, position);
position.x += glyph.advance;
}
}
i += clen;
}
context->gl.glEnd();
context->gl.glBindTexture(GL_TEXTURE_2D, 0);
}
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