Shader refactor

core/Material.cpp

@@ -43,4 +43,5 @@ Material::Material() {
   usesTex = false;
   alphaScissor = 0.0f;
   unshaded = false;
+  cullBack = true;
 }

core/Material.h

@@ -28,6 +28,7 @@ struct Material {
   bool usesTex;
   cfloat alphaScissor;
   bool unshaded;
+  bool cullBack;
   Material();
 };
 

core/Mesh.cpp

@@ -35,10 +35,7 @@ void SubMesh::SetupSubMesh() {
 }
 
 void SubMesh::Draw(Shader *shader) {
-  shader->UpdateColor(material.usesColor, material.color);
-  shader->UpdateTex(material.usesTex, material.tex);
-  shader->UpdateAlphaScissor(material.alphaScissor);
-  shader->UpdateUnshaded(material.unshaded);
+  shader->UpdateMaterial(material);
   glBindVertexArray(VAO);
   glDrawElements(GL_TRIANGLES, indices.size() * 3, GL_UNSIGNED_INT, 0);
   glBindVertexArray(0);

core/Shaders/ScreenShader.cpp

@@ -4,4 +4,8 @@
 
 ScreenShader::ScreenShader() : Shader(screen_vert, screen_frag) {}
 
+void ScreenShader::UpdateTex(Texture tex){
+  glBindTexture(GL_TEXTURE_2D, tex.id);
+}
+
 Name ScreenShader::GetName() const {return "Screen Shader";}

core/Shaders/ScreenShader.h

@@ -4,4 +4,5 @@ class ScreenShader : public Shader {
 public:
   ScreenShader();
   Name GetName() const;
+  void UpdateTex(Texture texture);
 };

core/Shaders/Shader.cpp

@@ -53,27 +53,19 @@ void Shader::UpdateProjection(Matrix projection) {
   glUniformMatrix4fv(glGetUniformLocation(id, "PROJECTION"), 1, GL_FALSE, glm::value_ptr(projection));
 }
 
-void Shader::UpdateColor(bool usesColor) {
-  glUniform1i(glGetUniformLocation(id, "material.usesColor"), (int) usesColor);
-}
-
-void Shader::UpdateColor(bool usesColor, Color color) {
-  glUniform1i(glGetUniformLocation(id, "material.usesColor"), (int) usesColor);
-  glUniform3f(glGetUniformLocation(id, "material.color"), color.r, color.g, color.b);
-}
-
-void Shader::UpdateTex(bool usesTex) {
-  glUniform1i(glGetUniformLocation(id, "material.usesTex"), (int) usesTex);
-}
-void Shader::UpdateTex(bool usesTex, Texture tex) {
-  glUniform1i(glGetUniformLocation(id, "material.usesTex"), (int) usesTex);
-  glBindTexture(GL_TEXTURE_2D, tex.id);
-}
-void Shader::UpdateAlphaScissor(cfloat alphaScissor) {
-  glUniform1f(glGetUniformLocation(id, "material.alphaScissor"), alphaScissor);
-}
-void Shader::UpdateUnshaded(bool unshaded) {
-  glUniform1i(glGetUniformLocation(id, "material.unshaded"), (int) unshaded);
+void Shader::UpdateMaterial(Material material) {
+  glUniform1i(glGetUniformLocation(id, "material.usesColor"), (int) material.usesColor);
+  glUniform3f(glGetUniformLocation(id, "material.color"),
+	      material.color.r,
+	      material.color.g,
+	      material.color.b);
+  glUniform1i(glGetUniformLocation(id, "material.usesTex"), (int) material.usesTex);
+  if (material.usesTex) {
+    glBindTexture(GL_TEXTURE_2D, material.tex.id);
+  }
+  glUniform1f(glGetUniformLocation(id, "material.alphaScissor"), material.alphaScissor);
+  glUniform1i(glGetUniformLocation(id, "material.unshaded"), (int) material.unshaded);
+  glUniform1i(glGetUniformLocation(id, "material.cullBack"), (int) material.cullBack);
 }
 
 void Shader::UpdateDirectionalLight(DirectionalLight directionalLight) {

core/Shaders/Shader.h

@@ -16,13 +16,9 @@ public:
   void UpdateView(Matrix view);
   void UpdateModel(Matrix model);
   void UpdateProjection(Matrix projection);
-  void UpdateColor(bool usesColor);
-  void UpdateColor(bool usesColor, Color color);
-  void UpdateTex(bool usesTex);
-  void UpdateTex(bool usesTex, Texture tex);
-  void UpdateAlphaScissor(cfloat alphaScissor);
-  void UpdateUnshaded(bool unshaded);
 
+  void UpdateMaterial(Material material);
+  
   void UpdateDirectionalLight(DirectionalLight directionalLight);
 
   virtual Name GetName() const;

core/couch.cpp

@@ -131,7 +131,7 @@ int main() {
     screen.Disable();
     // // Render the screen
     screenShader->Use();
-    screenShader->UpdateTex(true, screen.tex);
+    screenShader->UpdateTex(screen.tex);
     glViewport(0, 0, width, height);
     screen.Draw();
     

demo/main.lua

@@ -27,7 +27,7 @@ function init()
    camera.transform:Translate(0.0, 0.0, 10.0)
 
    light = couch.DirectionalLight.new()
-   light.direction = couch.Vector3(0.0, -1.0, 0.0)
+   light.direction = couch.Vector3(0.0, -1.0, 1.0)
    light.color = couch.Vector3(1.0, 1.0, 1.0)
    light.ambient = 0.2
    light.diffuse = 1.0
@@ -60,6 +60,9 @@ function init()
    material = scaffold:GetMaterial(0)
    material.alphaScissor = 0.9
    scaffold:SetMaterial(0, material)
+   material = scaffold:GetMaterial(1)
+   material.cullBack = false
+   scaffold:SetMaterial(1, material)
 
    material = scaffold:GetMaterial(1)
    material.alphaScissor = 0.1

shaders/flat.frag

@@ -16,22 +16,30 @@ struct Material {
   bool usesTex;
   float alphaScissor;
   bool unshaded;
+  bool cullBack;
 };
 
 uniform Material material;
 
 void main() {
   FragColor = vec4(0.0);
+  
   if (material.usesColor) {
     FragColor += vec4(material.color, 1.0);
   }
+  
   if (material.usesTex) {
     FragColor += texture(material.tex, UV);
   }
+  
   if (FragColor.w < material.alphaScissor) {
     discard;
   }
 
+  if (material.cullBack && !gl_FrontFacing) {
+    discard;
+  }
+
   if (!material.unshaded) {
     FragColor *= vec4(AMBIENT + DIFFUSE + SPECULAR, 1.0);
   }

shaders/screen.frag

@@ -4,15 +4,8 @@ in vec2 UV;
 
 out vec4 FragColor;
 
-struct Material {
-  vec3 color;
-  bool usesColor;
-  sampler2D tex;
-  bool usesTex;
-};
-
-uniform Material material;
+uniform sampler2D tex;
 
 void main() {
-  FragColor = texture(material.tex, UV);
+  FragColor = texture(tex, UV);
 }