1 files changed, 87 insertions, 0 deletions
diff --git a/engine-ocean/Graphics/textrenderer.cpp b/engine-ocean/Graphics/textrenderer.cpp
new file mode 100644
index 0000000..d5551f9
--- /dev/null
+++ b/engine-ocean/Graphics/textrenderer.cpp
@@ -0,0 +1,87 @@
+#include "textrenderer.h"
+#include "debug.h"
+
+void TextRenderer::initialize(){
+    glGenVertexArrays(1, &m_vao);
+    glGenBuffers(1, &m_vbo);
+    glBindVertexArray(m_vao);
+    glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 6 * 4, NULL, GL_DYNAMIC_DRAW);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(float), 0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);   
+}
+
+void TextRenderer::renderUIText(std::shared_ptr<Font> font, std::string text, glm::vec2 anchorPosition, AnchorPoint anchorPoint, float textBoxWidth, float fontSize, float lineSpacing, glm::vec3 textColor){
+    glActiveTexture(GL_TEXTURE0);
+    glBindVertexArray(m_vao);
+
+    float x = 0;
+    float y = 0;
+
+    float maxY = font->getCharacter(73).size.y * fontSize;
+    float minY = - (font->getCharacter(106).size.y - font->getCharacter(106).bearing.y) * fontSize;
+
+    switch(anchorPoint){
+        case AnchorPoint::TopLeft:
+            x = anchorPosition.x;
+            y = anchorPosition.y - maxY;
+            break;
+        case AnchorPoint::TopCenter:
+            x = anchorPosition.x - textBoxWidth * 0.5f;
+            y = anchorPosition.y - maxY;
+            break;
+        case AnchorPoint::TopRight:
+            x = anchorPosition.x - textBoxWidth;
+            y = anchorPosition.y - maxY;
+            break;
+    }
+
+    float initX = x;
+    float initY = y;
+
+    std::string::const_iterator c;
+    for (c = text.begin(); c != text.end(); c++)
+    {
+        Character ch = font->getCharacter(*c);
+
+        float xpos = x + ch.bearing.x * fontSize;
+        float ypos = y - (ch.size.y - ch.bearing.y) * fontSize;
+
+        float w = ch.size.x * fontSize;
+        float h = ch.size.y * fontSize;
+
+        if(xpos + w > initX + textBoxWidth){
+            x = initX;
+            y -= (1.f + lineSpacing) * (maxY - minY);
+
+            xpos = x + ch.bearing.x * fontSize;
+            ypos = y - (ch.size.y - ch.bearing.y) * fontSize;
+        }
+
+
+        // update VBO for each character
+        float vertices[6][4] = {
+            { xpos,     ypos + h,   0.0f, 0.0f },            
+            { xpos,     ypos,       0.0f, 1.0f },
+            { xpos + w, ypos,       1.0f, 1.0f },
+
+            { xpos,     ypos + h,   0.0f, 0.0f },
+            { xpos + w, ypos,       1.0f, 1.0f },
+            { xpos + w, ypos + h,   1.0f, 0.0f }           
+        };
+        // render glyph texture over quad
+        glBindTexture(GL_TEXTURE_2D, ch.textureID);
+        // update content of VBO memory
+        glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
+        glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices); 
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+        // render quad
+        glDrawArrays(GL_TRIANGLES, 0, 6);
+        // now advance cursors for next glyph (note that advance is number of 1/64 pixels)
+        x += (ch.advance >> 6) * fontSize; // bitshift by 6 to get value in pixels (2^6 = 64)
+    }
+    glBindVertexArray(0);
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+\ No newline at end of file