move gl stuff to Graphics class

CMakeLists.txt

@@ -29,6 +29,7 @@ ENDIF()
 IF(CMAKE_BUILD_TYPE STREQUAL "Debug")
     SET(LINK_FLAGS "${debug_linker}")
     SET(optimize_flags "-Og -g3 -ffunction-sections -fdata-sections")
+    ADD_DEFINITIONS(-DDEBUG)
 ELSE()
     SET(optimize_flags "-O3 -ffast-math")
 ENDIF()

src/graphics/graphics.cpp

@@ -13,6 +13,7 @@
 #include <iostream>
 #include <string>
 
+#ifdef DEBUG
 void GLAPIENTRY MessageCallback(GLenum source,
                                 GLenum type,
                                 GLuint id,
@@ -25,6 +26,7 @@ void GLAPIENTRY MessageCallback(GLenum source,
             (type == GL_DEBUG_TYPE_ERROR ? "** GL ERROR **" : ""), type,
             severity, message);
 }
+#endif
 
 Graphics::Graphics(Game* game) {
     this->pGame = game;
@@ -40,8 +42,50 @@ Graphics::Graphics(Game* game) {
     glewExperimental = GL_TRUE;
     glewInit();
 
+#ifdef DEBUG
     glEnable(GL_DEBUG_OUTPUT);
     glDebugMessageCallback(MessageCallback, nullptr);
+#endif
+
+    this->program = glCreateProgram();
+}
+
+void Graphics::compileShader(const char* shaderSrc, int shaderType) const {
+    GLuint shader = glCreateShader(shaderType);
+    glShaderSource(shader, 1, &shaderSrc, nullptr);
+    glCompileShader(shader);
+    glAttachShader(this->program, shader);
+#ifdef DEBUG
+    char msg[512];
+    glGetShaderInfoLog(shader, sizeof msg, nullptr, msg);
+    std::cout << "Vertex shader info: " << msg << "\n";
+#endif
+}
+
+void Graphics::bindAttribLoc(int argIndex, const char* argName) const {
+    glBindAttribLocation(this->program, argIndex, argName);
+}
+
+void Graphics::useProgram() const {
+    glLinkProgram(program);
+#ifdef DEBUG
+    char msg[512];
+    glGetProgramInfoLog(program, sizeof msg, nullptr, msg);
+    std::cout << "Program info: " << msg << "\n";
+#endif
+    glUseProgram(program);
+}
+
+GLint Graphics::getUniformLoc(const char* name) const {
+    return glGetUniformLocation(this->program, name);
+}
+
+void Graphics::setUniformValue(GLint position, const GLfloat value[4]) {
+    glUniform4fv(position, 1, value);
+}
+
+void Graphics::setUniformMatrixValue(GLint position, const GLfloat value[16]) {
+    glUniformMatrix4fv(position, 1, GL_FALSE, value);
 }
 
 void Graphics::storeVertexBufObj(GLuint& dest, GLsizeiptr size, int* target) {

src/graphics/graphics.h

@@ -18,12 +18,19 @@ class Window;
 class Graphics {
     Game* pGame;
     SDL_GLContext context = nullptr;
+    GLuint program;
 
    public:
     Graphics(Game*);
     ~Graphics() = default;
 
     void setGLContext();
+    void compileShader(const char* shaderSrc, int shaderType) const;
+    void bindAttribLoc(int, const char*) const;
+    void useProgram() const;
+    GLint getUniformLoc(const char* name) const;
+    static void setUniformValue(GLint, const GLfloat[4]);
+    static void setUniformMatrixValue(GLint, const GLfloat[16]);
 
     void draw();
 

src/scene/gears/gears.cpp

@@ -56,49 +56,27 @@ static const char* fragmentShader = R"(
 
 GearsScene::GearsScene(Game* pGame) {
     this->pGame = pGame;
-    char msg[512];
-    const char* p;
 
     glEnable(GL_CULL_FACE);
     glEnable(GL_DEPTH_TEST);
 
-    GLuint vertex;
-    GLuint fragment;
-    GLuint program;
+    this->pGame->pRenderer->compileShader(vertexShader, GL_VERTEX_SHADER);
+    this->pGame->pRenderer->compileShader(fragmentShader, GL_FRAGMENT_SHADER);
+    this->pGame->pRenderer->bindAttribLoc(0, "position");
+    this->pGame->pRenderer->bindAttribLoc(1, "normal");
 
-    p = vertexShader;
-    vertex = glCreateShader(GL_VERTEX_SHADER);
-    glShaderSource(vertex, 1, &p, nullptr);
-    glCompileShader(vertex);
-    glGetShaderInfoLog(vertex, sizeof msg, nullptr, msg);
-    std::cout << "Vertex shader info: " << msg << "\n";
-
-    p = fragmentShader;
-    fragment = glCreateShader(GL_FRAGMENT_SHADER);
-    glShaderSource(fragment, 1, &p, nullptr);
-    glCompileShader(fragment);
-    glGetShaderInfoLog(fragment, sizeof msg, nullptr, msg);
-    std::cout << "Fragment shader info: " << msg << "\n";
-
-    program = glCreateProgram();
-    glAttachShader(program, vertex);
-    glAttachShader(program, fragment);
-    glBindAttribLocation(program, 0, "position");
-    glBindAttribLocation(program, 1, "normal");
-
-    glLinkProgram(program);
-    glGetProgramInfoLog(program, sizeof msg, nullptr, msg);
-    std::cout << "Program info: " << msg << "\n";
-
-    glUseProgram(program);
+    this->pGame->pRenderer->useProgram();
 
     this->modelViewProjectionMatrixLoc =
-        glGetUniformLocation(program, "ModelViewProjectionMatrix");
-    this->normalMatrixLoc = glGetUniformLocation(program, "NormalMatrix");
-    this->lightSrcPosLoc = glGetUniformLocation(program, "LightSourcePosition");
-    this->materialColorLoc = glGetUniformLocation(program, "MaterialColor");
+        this->pGame->pRenderer->getUniformLoc("ModelViewProjectionMatrix");
+    this->normalMatrixLoc =
+        this->pGame->pRenderer->getUniformLoc("NormalMatrix");
+    this->lightSrcPosLoc =
+        this->pGame->pRenderer->getUniformLoc("LightSourcePosition");
+    this->materialColorLoc =
+        this->pGame->pRenderer->getUniformLoc("MaterialColor");
 
-    glUniform4fv((GLint)this->lightSrcPosLoc, 1, lightSourcePos);
+    Graphics::setUniformValue((GLint)this->lightSrcPosLoc, lightSourcePos);
 
     gears[0] = createGear(1.0, 4.0, 1.0, 20, 0.7);
     gears[1] = createGear(0.5, 2.0, 2.0, 10, 0.7);
@@ -266,11 +244,9 @@ Gear* GearsScene::createGear(GLfloat innerRad,
     }
 
     gear->nVertices = (int)(vertex - gear->vertices);
-    glGenBuffers(1, &gear->vertexBufObj);
-    glBindBuffer(GL_ARRAY_BUFFER, gear->vertexBufObj);
-    glBufferData(GL_ARRAY_BUFFER,
-                 (GLsizeiptr)(gear->nVertices * sizeof(GearVertex)),
-                 gear->vertices, GL_STATIC_DRAW);
+    Graphics::storeVertexBufObj(
+        gear->vertexBufObj, (GLsizeiptr)(gear->nVertices * sizeof(GearVertex)),
+        (int*)gear->vertices);
 
     return gear;
 }
@@ -295,9 +271,8 @@ void GearsScene::drawGear(Gear* gear,
     memcpy(modelViewProjection, this->projectionMatrix,
            sizeof(modelViewProjection));
     Graphics::multiply4x4Matrices(modelViewProjection, modelView);
-
-    glUniformMatrix4fv((GLint)this->modelViewProjectionMatrixLoc, 1, GL_FALSE,
-                       modelViewProjection);
+    Graphics::setUniformMatrixValue((GLint)this->modelViewProjectionMatrixLoc,
+                                    modelViewProjection);
 
     /*
      * Create and set the NormalMatrix. It's the inverse transpose of the
@@ -306,10 +281,10 @@ void GearsScene::drawGear(Gear* gear,
     memcpy(normalMatrix, modelView, sizeof(normalMatrix));
     Graphics::invert4x4Matrix(normalMatrix);
     Graphics::transpose4x4Matrix(normalMatrix);
-    glUniformMatrix4fv((GLint)this->normalMatrixLoc, 1, GL_FALSE, normalMatrix);
+    Graphics::setUniformMatrixValue((GLint)this->normalMatrixLoc, normalMatrix);
 
     /* Set the gear color */
-    glUniform4fv((GLint)this->materialColorLoc, 1, color);
+    Graphics::setUniformValue((GLint)this->materialColorLoc, color);
 
     /* Set the vertex buffer object to use */
     glBindBuffer(GL_ARRAY_BUFFER, gear->vertexBufObj);