add input handling, move vertexstrip struct to graphics, fix broken rendering of the gears

src/game/game.cpp

@@ -18,6 +18,7 @@ void Game::loop() {
     while (!this->done && !this->scenes.empty()) {
         this->pWindow->updateDimensions();
         this->done = this->pInput->pollEvent();
+        this->pInput->pollKeys();
 
         if (this->scenes.top()->destroy) {
             delete this->scenes.top();

src/graphics/graphics.cpp

@@ -102,7 +102,8 @@ void Graphics::enable(int cap) {
 
 void Graphics::drawArrays(GLuint& vertexBufObj,
                           int mode,
-                          int count,
+                          int stripCount,
+                          VertexStrip* strips,
                           int attrBindingIdx,
                           int attrCount,
                           int attrOffset,
@@ -121,7 +122,9 @@ void Graphics::drawArrays(GLuint& vertexBufObj,
     glBindVertexBuffer(attrBindingIdx, vertexBufObj, 0, attrCount * attrSize);
 
     /* Draw the triangle strips that comprise the gear */
-    glDrawArrays(mode, 0, count);
+    for (int n = 0; n < stripCount; ++n) {
+        glDrawArrays(mode, strips[n].first, strips[n].count);
+    }
 
     /* Disable the attributes */
     for (int i = attrCount - 1; i >= 0; --i) {

src/graphics/graphics.h

@@ -15,6 +15,14 @@
 class Game;
 class Window;
 
+// Struct describing the vertices in triangle strip
+using VertexStrip = struct VertexStrip {
+    // First vertex in the strip
+    GLint first;
+    // Number of consecutive verices in the strip after the first
+    GLint count;
+};
+
 class Graphics {
     Game* pGame;
     SDL_GLContext context = nullptr;
@@ -38,7 +46,8 @@ class Graphics {
 
     static void drawArrays(GLuint& vertexBufObj,
                            int mode,
-                           int count,
+                           int stripCount,
+                           VertexStrip* strips,
                            int attrBindingIdx,
                            int attrCount,
                            int attrOffset,

src/input/input.cpp

@@ -3,6 +3,7 @@
  * All rights reserved
  */
 
+#include <SDL2/SDL_keyboard.h>
 #include <game/game.h>
 #include <input/input.h>
 
@@ -22,3 +23,7 @@ bool Input::pollEvent() {
            event.window.windowID ==
                SDL_GetWindowID(this->game->pWindow->window);
 }
+
+void Input::pollKeys() {
+    this->keys = SDL_GetKeyboardState(nullptr);
+}

src/input/input.h

@@ -18,7 +18,9 @@ class Input {
    public:
     Input(Game*);
     ~Input() = default;
+    const Uint8* keys;
     bool pollEvent();
+    void pollKeys();
 };
 
 #endif

src/scene/gears/gears.cpp

@@ -5,6 +5,8 @@
 
 #include <GLES3/gl3.h>
 #include <GL/glew.h>
+#include <SDL2/SDL_keycode.h>
+#include <SDL2/SDL_scancode.h>
 #include <game/game.h>
 #include <graphics/graphics.h>
 #include <scene/gears/gears.h>
@@ -266,8 +268,8 @@ void GearsScene::drawGear(Gear* gear,
     Graphics::setUniformValue((GLint)materialColorLoc, color);
 
     // Draw the triangle strips that comprise the gear
-    Graphics::drawArrays(gear->vertexBufObj, GL_TRIANGLE_STRIP, gear->nVertices,
-                         0, 2, 0, sizeof(GLfloat) * 3);
+    Graphics::drawArrays(gear->vertexBufObj, GL_TRIANGLE_STRIP, gear->nStrips,
+                         gear->strips, 0, 2, 0, sizeof(GLfloat) * 3);
 }
 
 void GearsScene::reshape() {
@@ -317,6 +319,22 @@ void GearsScene::idle() {
     }
 }
 
+void GearsScene::keypress() {
+    static const Uint8* keys = pGame->pInput->keys;
+    if (keys[SDL_SCANCODE_LEFT] || keys[SDL_SCANCODE_A]) {
+        viewRotation[1] += 5.0F;
+    }
+    if (keys[SDL_SCANCODE_RIGHT] || keys[SDL_SCANCODE_D]) {
+        viewRotation[1] -= 5.0F;
+    }
+    if (keys[SDL_SCANCODE_UP] || keys[SDL_SCANCODE_W]) {
+        viewRotation[0] += 5.0F;
+    }
+    if (keys[SDL_SCANCODE_DOWN] || keys[SDL_SCANCODE_S]) {
+        viewRotation[0] -= 5.0F;
+    }
+}
+
 void GearsScene::draw() {
     const static GLfloat red[4] = {0.8, 0.1, 0.0, 1.0};
     const static GLfloat green[4] = {0.0, 0.8, 0.2, 1.0};
@@ -344,5 +362,6 @@ void GearsScene::draw() {
              blue);
 
     reshape();
+    keypress();
     idle();
 }

src/scene/gears/gears.h

@@ -11,13 +11,7 @@
 #define VERTICES_PER_TOOTH 34
 #define GEAR_VERTEX_STRIDE 6
 
-// Class describing the vertices in triangle strip
-using VertexStrip = struct {
-    // First vertex in the strip
-    GLint first;
-    // Number of consecutive verices in the strip after the first
-    GLint count;
-};
+struct VertexStrip;
 
 // Each vertex consists of GEAR_VERTEX_STRIDE GLfloat attributes
 using GearVertex = GLfloat[GEAR_VERTEX_STRIDE];
@@ -75,6 +69,7 @@ class GearsScene : public Scene {
 
     void idle();
     void reshape();
+    void keypress();
 
     // The direction of the directional light for the scene
     const GLfloat lightSourcePos[4] = {5.0, 5.0, 10.0, 1.0};