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#include "fonts.h"
#include <algorithm>
#include "glm/gtc/matrix_transform.hpp"
#include "glm/gtx/transform.hpp"
#ifdef __APPLE__
#define sggBindVertexArray glBindVertexArrayAPPLE
#define sggGenVertexArrays glGenVertexArraysAPPLE
#else
#define sggBindVertexArray glBindVertexArray
#define sggGenVertexArrays glGenVertexArrays
#endif
const char* __FontVertexShader = R"(
#version 120
attribute vec4 coord;
varying vec2 texcoord;
uniform mat4 projection;
uniform mat4 modelview;
void main(void) {
gl_Position = projection * modelview * vec4(coord.xy, 0, 1);
texcoord = coord.zw;
}
)";
const char* __FontFragmentShader = R"(
#version 120
varying vec2 texcoord;
uniform vec4 color1;
uniform vec4 color2;
uniform sampler2D tex;
uniform vec2 gradient;
void main(void) {
vec4 color = mix( color1, color2, dot(texcoord,gradient));
gl_FragColor = vec4(1, 1, 1, texture2D(tex, texcoord).r) * color;
}
)";
bool FontLib::init()
{
if (FT_Init_FreeType(&m_ft))
{
return false;
}
glGetError();
const GLubyte * s = glewGetErrorString(glGetError());
m_font_shader = Shader(__FontVertexShader, __FontFragmentShader);
if (!m_font_shader.init())
return false;
unsigned int attrib_position = m_font_shader.getAttributeLocation("coord");
sggGenVertexArrays(1, &m_font_vao);
sggBindVertexArray(m_font_vao);
glGenBuffers(1, &m_font_vbo);
glBindBuffer(GL_ARRAY_BUFFER, m_font_vbo);
glEnableVertexAttribArray(attrib_position);
glVertexAttribPointer(attrib_position, 4, GL_FLOAT, GL_FALSE, 0, 0);
GLfloat box[4][4] = {
{ -1, 1 , 0, 0 },
{ 1, 1 , 1, 0 },
{ -1, -1, 0, 1 },
{ 1, -1, 1, 1 },
};
glBufferData(GL_ARRAY_BUFFER, sizeof box, box, GL_DYNAMIC_DRAW);
m_curr_font = m_fonts.end();
return true;
}
void FontLib::submitText(const TextRecord & text)
{
m_content.push_back(text);
}
void FontLib::drawText(TextRecord entry)
{
float x = 0.0f;
float y = 0.0f;
const char *p;
if (m_curr_font == m_fonts.end())
return;
Font font = m_curr_font->second;
FT_GlyphSlot g = font.face->glyph;
#ifndef __APPLE__
//glFrontFace(GL_CW);
#endif
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, font.font_tex);
static int c = 0;
m_font_shader.use();
m_font_shader["tex"] = 0;
m_font_shader["color1"] = entry.color1;
m_font_shader["color2"] = (entry.use_gradient? entry.color2 : entry.color1);
m_font_shader["gradient"] = entry.gradient;
m_font_shader["projection"] = entry.proj;
for (p = entry.text.c_str(); *p; p++) {
if (FT_Load_Char(font.face, *p, FT_LOAD_RENDER))
continue;
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RED,
g->bitmap.width,
g->bitmap.rows,
0,
GL_RED,
GL_UNSIGNED_BYTE,
g->bitmap.buffer
);
float w = g->bitmap.width;
float h = g->bitmap.rows;
w = entry.size.x * g->bitmap.width / (float)m_font_res;
h = entry.size.y * g->bitmap.rows / (float)m_font_res;
float b = g->metrics.horiBearingY/(64* (float)m_font_res)*entry.size.y - h;
GLfloat box[4][4] = {
{ x, y-b , 0, 1 },
{ x + w, y-b , 1, 1 },
{ x, y - h - b, 0, 0 },
{ x + w, y - h -b, 1, 0 },
};
m_font_shader["modelview"] = glm::translate(glm::vec3(entry.pos.x, entry.pos.y, 0.0f)) * entry.mv;
sggBindVertexArray(m_font_vao);
glBindBuffer(GL_ARRAY_BUFFER, m_font_vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof box, box, GL_DYNAMIC_DRAW);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
x += std::max(w+ entry.size.x*0.05f, entry.size.x*0.15f);
y += entry.size.y*1.1f*(g->advance.y);
}
glBindTexture(GL_TEXTURE_2D, 0);
glFrontFace(GL_CCW);
}
void FontLib::commitText()
{
m_font_shader.use();
glEnable(GL_SCISSOR_TEST);
for (auto item : m_content)
{
drawText(item);
}
m_content.clear();
}
void FontLib::setCanvas(glm::vec2 sz)
{
m_canvas = sz;
}
bool FontLib::setCurrentFont(std::string fontname)
{
m_curr_font = m_fonts.find(fontname);
if (m_curr_font != m_fonts.end())
return true;
Font font;
if (FT_New_Face(m_ft, fontname.c_str(), 0, &font.face))
{
return false;
}
FT_Set_Pixel_Sizes(font.face, 0, m_font_res);
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &font.font_tex);
glBindTexture(GL_TEXTURE_2D, font.font_tex);
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);
m_curr_font = m_fonts.insert(std::pair<std::string, Font>(fontname,font)).first;
return true;
}
FT_Library FontLib::m_ft = nullptr;
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