1 files changed, 139 insertions, 0 deletions
diff --git a/Project/Shader.cpp b/Project/Shader.cpp
new file mode 100644
index 0000000..7835fec
--- /dev/null
+++ b/Project/Shader.cpp
@@ -0,0 +1,139 @@
+#include "Shader.h"
+#include "Renderer.h"
+
+#include <wx/msgdlg.h>
+
+#include <fstream>
+#include <sstream>
+#include <string>
+
+
+Shader::Shader(const std::string& filepath)
+    : m_filepath(filepath), m_rendererID(0)
+{
+    ShaderSource source = ParseShader(filepath);
+    m_rendererID = CreateShader(source.vertexShader, source.fragmentShader);
+}
+
+Shader::~Shader()
+{
+    GLCall(glDeleteProgram(m_rendererID));
+}
+
+
+unsigned int Shader::CompileShader(unsigned int type, const wxString& source) const
+{
+    unsigned int id = glCreateShader(type);
+    const char* src = source.c_str();
+    GLCall(glShaderSource(id, 1, &src, nullptr));
+    GLCall(glCompileShader(id));
+
+    // Error handling
+    int result;
+    GLCall(glGetShaderiv(id, GL_COMPILE_STATUS, &result));
+    if (result == GL_FALSE) {
+        int length;
+        GLCall(glGetShaderiv(id, GL_INFO_LOG_LENGTH, &length));
+        char* message = static_cast<char*>(alloca(length * sizeof(char))); // Heap allocation dynamically! =)
+        GLCall(glGetShaderInfoLog(id, length, &length, message));
+
+        wxMessageBox(wxString::Format("Erro ao compilar o \"%s shader\" ='(\n%s", type == GL_VERTEX_SHADER ? "vertex" : "fragment", message));
+
+        GLCall(glDeleteShader(id));
+        return 0;
+    }
+    return id;
+}
+
+ShaderSource Shader::ParseShader(const wxString& filepath) const
+{
+    enum class ShaderType
+    {
+        NONE = -1, VERTEX = 0, FRAGMENT = 1
+    };
+
+    ShaderType type = ShaderType::NONE;
+
+    std::ifstream stream(filepath.ToStdString());
+    std::string line;
+    std::stringstream ss[2];
+
+    while (getline(stream, line))
+    {
+        if (line.find("#shader") != std::string::npos) {
+            if (line.find("vertex") != std::string::npos) {
+                type = ShaderType::VERTEX;
+            }
+            else if (line.find("fragment") != std::string::npos) {
+                type = ShaderType::FRAGMENT;
+            }
+        }
+        else {
+            ss[static_cast<int>(type)] << line + std::string("\n");
+        }
+    }
+
+    return { ss[0].str(), ss[1].str() };
+}
+
+unsigned int Shader::CreateShader(std::string& vertexShader, std::string& fragmentShader) const
+{
+    GLCall(unsigned int program = glCreateProgram());
+    unsigned int vs = CompileShader(GL_VERTEX_SHADER, vertexShader);
+    unsigned int fs = CompileShader(GL_FRAGMENT_SHADER, fragmentShader);
+
+    GLCall(glAttachShader(program, vs));
+    GLCall(glAttachShader(program, fs));
+
+    GLCall(glLinkProgram(program));
+    GLCall(glValidateProgram(program));
+
+    GLCall(glDeleteShader(vs));
+    GLCall(glDeleteShader(fs));
+
+    return program;
+}
+
+void Shader::Bind() const
+{
+    GLCall(glUseProgram(m_rendererID));
+}
+
+void Shader::Unbind() const
+{
+    GLCall(glUseProgram(0));
+}
+
+void Shader::SetUniform4f(const std::string& name, float v0, float v1, float v2, float v3)
+{
+    GLCall(glUniform4f(GetUniformLocation(name), v0, v1, v2, v3));
+}
+
+void Shader::SetUniform2f(const std::string& name, float v0, float v1)
+{
+    GLCall(glUniform2f(GetUniformLocation(name), v0, v1));
+}
+
+void Shader::SetUniformMatrix4fv(const std::string& name, const glm::mat4& matrix)
+{
+    GLCall(glUniformMatrix4fv(GetUniformLocation(name), 1, GL_FALSE, &matrix[0][0]));
+}
+
+void Shader::SetUniform1f(const std::string& name, const float& value)
+{
+    GLCall(glUniform1f(GetUniformLocation(name), value));
+}
+
+unsigned int Shader::GetUniformLocation(const std::string& name)
+{
+    if (m_uniformLocationCache.find(name) != m_uniformLocationCache.end())
+        return m_uniformLocationCache[name];
+
+    GLCall(int location = glGetUniformLocation(m_rendererID, name.c_str()));
+    if (location == -1) {
+        wxMessageBox(wxString::Format("Atenção! uniform \"%s\" não encontrado", name));
+    }
+    
+    m_uniformLocationCache[name] = location;
+    return location;
+}