Changed name and made a TextPassState

2016-01-23 11:38:31 +01:00
parent ea9c4d19d0
commit 445248af55
7 changed files with 46 additions and 17 deletions
@@ -0,0 +1,107 @@
+#include "Rendering/TextPass.h"
+
+TextPass::TextPass()
+{
+
+}
+
+void TextPass::Initialize()
+{
+    glGenVertexArrays(1, &VAO);
+    glGenBuffers(1, &VBO);
+    glBindVertexArray(VAO);
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 6 * 4, NULL, GL_DYNAMIC_DRAW);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), 0);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+
+    m_TextProgram = ResourceManager::Load<ShaderProgram>("#TextProgram");
+    m_TextProgram->AddShader(std::shared_ptr<Shader>(new VertexShader("Shaders/Text.vert.glsl")));
+    m_TextProgram->AddShader(std::shared_ptr<Shader>(new FragmentShader("Shaders/Text.frag.glsl")));
+    m_TextProgram->Compile();
+    m_TextProgram->Link();
+}
+
+void TextPass::Update()
+{
+
+}
+
+void TextPass::Draw(RenderScene& scene)
+{
+    for (auto &job : scene.TextJobs) {
+        auto textJob = std::dynamic_pointer_cast<TextJob>(job);
+        if (textJob) {
+
+            renderText(textJob->Content, textJob->Resource, textJob->Alignment, textJob->Color, textJob->Matrix, scene.Camera->ProjectionMatrix(), scene.Camera->ViewMatrix());
+        }
+    }
+}
+
+void TextPass::renderText(std::string text, Font* font, TextJob::AlignmentEnum alignment, glm::vec4 color, glm::mat4 modelMatrix, glm::mat4 projectionMatrix, glm::mat4 viewMatrix)
+{
+    GLfloat penX = 0;
+    GLfloat penY = 0;
+    GLfloat scale = 1.0/font->FontSize;
+
+    GLfloat stringWidth = 0.f;
+
+    for (std::string::const_iterator c = text.begin(); c != text.end(); c++) {
+        Font::Character ch = font->m_Characters[*c];
+        stringWidth += (ch.Advance >> 6) * scale;
+    }
+
+    if(alignment == TextJob::AlignmentEnum::Center) {
+        penX = -stringWidth/2.f;
+    } else if (alignment == TextJob::AlignmentEnum::Right) {
+        penX = -stringWidth;
+    } else {
+        penX = 0;
+    }	
+    
+    TextPassState state;
+
+    m_TextProgram->Bind();
+    glUniform3f(glGetUniformLocation(m_TextProgram->GetHandle(), "textColor"), color.x, color.y, color.z);
+    glUniformMatrix4fv(glGetUniformLocation(m_TextProgram->GetHandle(), "M"), 1, GL_FALSE, glm::value_ptr(modelMatrix));
+    glUniformMatrix4fv(glGetUniformLocation(m_TextProgram->GetHandle(), "V"), 1, GL_FALSE, glm::value_ptr(viewMatrix));
+    glUniformMatrix4fv(glGetUniformLocation(m_TextProgram->GetHandle(), "P"), 1, GL_FALSE, glm::value_ptr(projectionMatrix));
+    glActiveTexture(GL_TEXTURE0);
+    glBindVertexArray(VAO);
+
+
+    for (std::string::const_iterator c = text.begin(); c != text.end(); c++) {
+        Font::Character ch = font->m_Characters[*c];
+
+        GLfloat xpos = penX + ch.Bearing.x * scale;
+        GLfloat ypos = penY - (ch.Size.y - ch.Bearing.y) * scale;
+
+        GLfloat w = ch.Size.x * scale;
+        GLfloat h = ch.Size.y * scale;
+
+        GLfloat vertices[6][4] = {
+            { xpos, ypos + h, 0.0, 0.0 },
+            { xpos, ypos, 0.0, 1.0 },
+            { xpos + w, ypos, 1.0, 1.0 },
+
+            { xpos, ypos + h, 0.0, 0.0 },
+            { xpos + w, ypos, 1.0, 1.0 },
+            { xpos + w, ypos + h, 1.0, 0.0 }
+        };
+
+        glBindTexture(GL_TEXTURE_2D, ch.TextureID);
+
+        glBindBuffer(GL_ARRAY_BUFFER, VBO);
+        glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+        glDrawArrays(GL_TRIANGLES, 0, 6);
+        penX += (ch.Advance >> 6) * scale; // Bitshift by 6 to get value in pixels (2^6 = 64)
+    }
+    glBindVertexArray(0);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    GLERROR("Text rendering Error");
+}
+