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FontMaster.cpp
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281 lines (219 loc) · 10.6 KB
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#include "FontMaster.h"
#include <OVR_FileSys.h>
#include <freetype/tttables.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
using namespace OVR;
namespace FontManager {
FT_Library ft;
GLuint VAO, VBO;
GlProgram glProgram;
GLfloat vertices[6 * 100][4];
static const char VERTEX_SHADER[] =
"#version 330 core\n"
"layout (location = 0) in vec4 vertex; // <vec2 pos, vec2 tex>\n"
"out vec2 TexCoords;\n"
"uniform mat4 projection;\n"
"void main()\n"
"{\n"
" gl_Position = projection * vec4(vertex.xy, 0.0, 1.0);\n"
" TexCoords = vertex.zw;\n"
"}\n";
static const char FRAGMENT_SHADER[] =
"#version 330 core\n"
"in vec2 TexCoords;\n"
"out vec4 color;\n"
"uniform sampler2D text;\n"
"uniform vec4 textColor;\n"
"void main()\n"
"{\n"
" color = textColor * texture(text, TexCoords).a;\n"
"}\n";
void Init(int MenuWidth, int MenuHeight) {
if (FT_Init_FreeType(&ft))
OVR_LOG_WITH_TAG("FontMaster", "ERROR::FREETYPE: Could not init FreeType Library");
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 6 * 4 * 100, NULL, GL_DYNAMIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), 0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
glProgram = GlProgram::Build(VERTEX_SHADER, FRAGMENT_SHADER, NULL, 0);
glUseProgram(glProgram.Program);
glm::mat4 projection = glm::ortho(0.0f, (float) MenuWidth, 0.0f, (float) MenuHeight);
glUniformMatrix4fv(glGetUniformLocation(glProgram.Program, "projection"), 1, GL_FALSE,
glm::value_ptr(projection));
OVR_LOG_WITH_TAG("FontMaster", "Initialized");
}
void LoadFont(RenderFont *font, FT_Face face, uint fontSize) {
font->FontSize = fontSize;
FT_Set_Pixel_Sizes(face, 0, fontSize);
// Disable byte-alignment restriction
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
// create a texture for the characters
int textureWidth = 30 * fontSize;
int textureHeight = 8 * fontSize;
glGenTextures(1, &font->textureID);
glBindTexture(GL_TEXTURE_2D, font->textureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, textureWidth, textureHeight, 0, GL_ALPHA,
GL_UNSIGNED_BYTE, NULL);
int posX = 1;
int posY = 1;
for (GLubyte c = 32; c < 192; c++) {
// Load character glyph
if (FT_Load_Char(face, c, FT_LOAD_RENDER)) {
// std::cout << "ERROR::FREETYTPE: Failed to load Glyph" << std::endl;
continue;
}
float descent = 0.0f;
if (descent < (face->glyph->bitmap.rows - face->glyph->bitmap_top)) {
descent = face->glyph->bitmap.rows - face->glyph->bitmap_top;
}
float ascent_calc = 0.0f;
if (face->glyph->bitmap_top < face->glyph->bitmap.rows) {
ascent_calc = face->glyph->bitmap.rows;
} else {
ascent_calc = face->glyph->bitmap_top;
}
float ascent = 0.0f;
if (ascent < (ascent_calc - descent)) {
ascent = ascent_calc - descent;
}
if (font->offsetY < (int) ascent) {
OVR_LOG("new ascent %i to %f", font->offsetY, ascent);
font->offsetY = (int) ascent;
}
// go to the next line
if (posX + face->glyph->bitmap.width > textureWidth) {
posX = 0;
posY += fontSize + fontSize * 1 / 2.0f;
}
glTexSubImage2D(GL_TEXTURE_2D, 0, posX, posY, face->glyph->bitmap.width,
face->glyph->bitmap.rows, GL_ALPHA, GL_UNSIGNED_BYTE,
face->glyph->bitmap.buffer);
// Now store character for later use
Character character = {glm::fvec4((float) posX / textureWidth, (float) posY / textureHeight,
(float) (posX + face->glyph->bitmap.width) / textureWidth,
(float) (posY + face->glyph->bitmap.rows) / textureHeight),
glm::ivec2(face->glyph->bitmap.width, face->glyph->bitmap.rows),
glm::ivec2(face->glyph->bitmap_left, face->glyph->bitmap_top),
((GLuint) face->glyph->advance.x >> 6)};
font->Characters.insert(std::pair<GLchar, Character>(c, character));
posX += face->glyph->bitmap.width + 2;
}
Character ch = font->Characters['P'];
font->PHeight = ch.Size.y;
font->PStart = font->offsetY - ch.Bearing.y;
OVR_LOG_WITH_TAG("FontMaster", "offset: %i, height: %i, start: %i", font->offsetY, font->PHeight, font->PStart);
// Set texture options
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);
glBindTexture(GL_TEXTURE_2D, 0);
FT_Done_Face(face);
OVR_LOG_WITH_TAG("FontMaster", "finished loading font");
}
void LoadFontFromAssets(App *app, RenderFont *font, const char *filePath, uint fontSize) {
OVR_LOG_WITH_TAG("FontMaster", "start loading font from assets");
static MemBufferT<uint8_t> buffer;
FT_Face face;
if (app->GetFileSys().ReadFile(filePath, buffer))
if (FT_New_Memory_Face(ft, buffer, buffer.GetSize(), 0, &face)) {
OVR_LOG_WITH_TAG("FontMaster", "ERRO::FREETYPE: Faild to load font from memory");
} else {
LoadFont(font, face, fontSize);
}
}
void LoadFont(RenderFont *font, const char *filePath, uint fontSize) {
OVR_LOG_WITH_TAG("FontMaster", "start loading font from android system");
FT_Face face;
if (FT_New_Face(ft, filePath, 0, &face))
OVR_LOG_WITH_TAG("FontMaster", "ERROR::FREETYPE: Failed to load font");
LoadFont(font, face, fontSize);
}
void CloseFontLoader() { FT_Done_FreeType(ft); }
int GetWidth(RenderFont font, std::string text) {
int width = 0;
// Iterate through all characters
std::string::const_iterator c;
for (c = text.begin(); c != text.end(); c++) {
Character ch = font.Characters[*c];
width += (ch.Advance);
}
return width;
}
void Begin() {
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
glActiveTexture(GL_TEXTURE0);
glBindVertexArray(VAO);
glUseProgram(glProgram.Program);
}
void Close() {
glBindVertexArray(0);
glBindTexture(GL_TEXTURE_2D, 0);
}
void RenderText(RenderFont font, std::string text, GLfloat x, GLfloat y, GLfloat scale,
ovrVector4f color, float transparency) {
// Iterate through all characters
std::string::const_iterator c;
int index = 0;
for (c = text.begin(); c != text.end(); c++) {
Character ch = font.Characters[*c];
GLfloat xpos = x + ch.Bearing.x * scale;
GLfloat ypos = y + font.offsetY - ch.Bearing.y; // font.FontSize;// - (ch.Bearing.y) * scale;
GLfloat w = ch.Size.x * scale;
GLfloat h = ch.Size.y * scale;
// Update VBO for each character
GLfloat charVertices[6][4] = {{xpos, ypos + h, ch.Position.x, ch.Position.w},
{xpos, ypos, ch.Position.x, ch.Position.y},
{xpos + w, ypos, ch.Position.z, ch.Position.y},
{xpos, ypos + h, ch.Position.x, ch.Position.w},
{xpos + w, ypos, ch.Position.z, ch.Position.y},
{xpos + w, ypos + h, ch.Position.z, ch.Position.w}};
memcpy(&vertices[6 * index], &charVertices, sizeof(charVertices));
// Now advance cursors for next glyph (note that advance is number of 1/64 pixels)
x += (ch.Advance) * scale; // Bitshift by 6 to get value in pixels (2^6 = 64)
index++;
}
// Activate corresponding render state
glUniform4f(glGetUniformLocation(glProgram.Program, "textColor"), color.x * transparency,
color.y * transparency, color.z * transparency, color.w * transparency);
glBindTexture(GL_TEXTURE_2D, font.textureID);
// Update content of VBO memory
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// Render quad
// .length() will not work when a char is bigger than 1 byte
glDrawArrays(GL_TRIANGLES, 0, 6 * text.length());
}
void RenderFontTexture(FontManager::RenderFont font, ovrVector4f color, float transparency) {
GLfloat posX = 0.0f;
GLfloat posY = 200.0f;
GLfloat posZ = posX + font.FontSize * 30.0f;
GLfloat posW = posY + font.FontSize * 8.0f;
// Update VBO for each character
GLfloat charVertices[6][4] = {{posX, posW, 0, 1},
{posX, posY, 0, 0},
{posZ, posY, 1, 0},
{posX, posW, 0, 1},
{posZ, posY, 1, 0},
{posZ, posW, 1, 1}};
// Activate corresponding render state
glUniform4f(glGetUniformLocation(glProgram.Program, "textColor"),
color.x * transparency, color.y * transparency, color.z * transparency, color.w * transparency);
glBindTexture(GL_TEXTURE_2D, font.textureID);
// Update content of VBO memory
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(charVertices), charVertices);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// Render quad
glDrawArrays(GL_TRIANGLES, 0, 6);
}
} // namespace FontManager