53 lines
2.0 KiB
C++
53 lines
2.0 KiB
C++
#include "Glyph.h"
|
|
|
|
#define round_up_26_6(val) (((val) + 63) >> 6u)
|
|
|
|
bool Glyph::load(FT_Face face, FT_ULong char_code)
|
|
{
|
|
if (FT_Load_Char(face, char_code, FT_LOAD_RENDER) != 0)
|
|
return false;
|
|
|
|
m_texture = glcxx::Texture::create();
|
|
m_texture->bind(GL_TEXTURE_2D);
|
|
int width = face->glyph->bitmap.width;
|
|
int rounded_width = glcxx::Texture::next_power_of_2(width);
|
|
int height = face->glyph->bitmap.rows;
|
|
int rounded_height = glcxx::Texture::next_power_of_2(height);
|
|
m_advance = round_up_26_6(face->glyph->advance.x);
|
|
uint8_t * texture = new uint8_t[rounded_width * rounded_height];
|
|
memset(texture, 0, rounded_width * rounded_height);
|
|
for (int i = 0; i < height; i++)
|
|
{
|
|
memcpy(&texture[rounded_width * i],
|
|
&face->glyph->bitmap.buffer[width * (height - i - 1)],
|
|
width);
|
|
}
|
|
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
|
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, rounded_width, rounded_height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, texture);
|
|
delete[] texture;
|
|
|
|
m_array = glcxx::Array::create();
|
|
m_array->bind();
|
|
|
|
int left = face->glyph->bitmap_left;
|
|
int top = face->glyph->bitmap_top;
|
|
float s_max = width / (float)rounded_width;
|
|
float t_max = height / (float)rounded_height;
|
|
m_buffer = glcxx::Buffer::create(GL_ARRAY_BUFFER, GL_STATIC_DRAW, {
|
|
(GLfloat)left, (GLfloat)(top - height), 0.0, 0.0,
|
|
(GLfloat)(left + width), (GLfloat)(top - height), s_max, 0.0,
|
|
(GLfloat)left, (GLfloat)top, 0.0, t_max,
|
|
(GLfloat)(left + width), (GLfloat)top, s_max, t_max,
|
|
});
|
|
|
|
glEnableVertexAttribArray(0);
|
|
glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, 0);
|
|
|
|
return true;
|
|
}
|