Work In Progress

lib/renderer/g_buffer.rb

@@ -5,7 +5,7 @@ class IMICFPS
     attr_reader :screen_vbo, :vertices, :uvs
     def initialize
       @framebuffer = nil
-      @buffers = [:position, :diffuse, :normal, :texcoord]
+      @buffers = [:position, :diffuse, :normal, :texcoord, :scene]
       @textures = {}
       @screen_vbo = nil
       @ready = false
@@ -86,9 +86,9 @@ class IMICFPS
         @textures[@buffers[i]] = texture_id
 
         glBindTexture(GL_TEXTURE_2D, texture_id)
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, width, height, 0, GL_RGBA, GL_FLOAT, nil)
-        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
-        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, width, height, 0, GL_RGBA, GL_FLOAT, nil)
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D, texture_id, 0)
       end
 
@@ -101,7 +101,7 @@ class IMICFPS
       glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, width, height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nil)
       glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, texture_id, 0)
 
-      draw_buffers = [ GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3 ]
+      draw_buffers = @buffers.each_with_index.map { |b ,i| Object.const_get("GL_COLOR_ATTACHMENT#{i}") }
       glDrawBuffers(draw_buffers.size, draw_buffers.pack("I*"))
     end
 

lib/renderer/opengl_renderer.rb

@@ -16,7 +16,7 @@ class IMICFPS
     end
 
     def render(camera, lights, entities)
-      if Shader.available?("default") && Shader.available?("render_screen")
+      if Shader.available?("default") && Shader.available?("render_screen") && Shader.available?("lighting")
         @g_buffer.bind_for_writing
         gl_error?
 
@@ -24,19 +24,6 @@ class IMICFPS
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
 
         Shader.use("default") do |shader|
-          lights.each_with_index do |light, i|
-            shader.uniform_float("lights[#{i}.end", -1.0);
-            shader.uniform_float("lights[#{i}.type", light.type);
-            shader.uniform_vec3("lights[#{i}].position", light.position)
-            shader.uniform_vec3("lights[#{i}].ambient", light.ambient)
-            shader.uniform_vec3("lights[#{i}].diffuse", light.diffuse)
-            shader.uniform_vec3("lights[#{i}].specular", light.specular)
-          end
-          gl_error?
-
-
-          shader.uniform_integer("totalLights", lights.size)
-
           entities.each do |entity|
             next unless entity.visible && entity.renderable
 
@@ -52,6 +39,9 @@ class IMICFPS
           end
         end
 
+        lighting(lights)
+        post_processing
+
         @g_buffer.unbind_framebuffer
         gl_error?
 
@@ -59,8 +49,6 @@ class IMICFPS
         @g_buffer.bind_for_reading
         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0)
 
-        # lighting(lights)
-        post_processing
         render_framebuffer
 
         @g_buffer.unbind_framebuffer
@@ -96,25 +84,32 @@ class IMICFPS
     end
 
     def lighting(lights)
-      @g_buffer.set_read_buffer(:position)
-      glBlitFramebuffer(0, 0, @g_buffer.width, @g_buffer.height,
-                        0, 0, @g_buffer.width / 2, @g_buffer.height / 2,
-                        GL_COLOR_BUFFER_BIT, GL_LINEAR)
+      if Shader.available?("lighting")
+        Shader.use("lighting") do |shader|
+          lights.each do |light|
+            shader.uniform_integer("inLightType", light.type);
+            shader.uniform_vec3("inLightPosition", light.position)
+            shader.uniform_vec3("inLightAmbient", light.ambient)
+            shader.uniform_vec3("inLightDiffuse", light.diffuse)
+            shader.uniform_vec3("inLightSpecular", light.specular)
 
-      @g_buffer.set_read_buffer(:diffuse)
-      glBlitFramebuffer(0, 0, @g_buffer.width, @g_buffer.height,
-                        0, @g_buffer.height / 2, @g_buffer.width / 2, @g_buffer.height,
-                        GL_COLOR_BUFFER_BIT, GL_LINEAR)
+            glBindVertexArray(@g_buffer.screen_vbo)
+            glEnableVertexAttribArray(0)
+            glEnableVertexAttribArray(1)
 
-      @g_buffer.set_read_buffer(:normal)
-      glBlitFramebuffer(0, 0, @g_buffer.width, @g_buffer.height,
-                        @g_buffer.width / 2, @g_buffer.height / 2, @g_buffer.width, @g_buffer.height,
-                        GL_COLOR_BUFFER_BIT, GL_LINEAR)
+            glDisable(GL_DEPTH_TEST)
+            glEnable(GL_BLEND)
 
-      @g_buffer.set_read_buffer(:texcoord)
-      glBlitFramebuffer(0, 0, @g_buffer.width, @g_buffer.height,
-                        @g_buffer.width / 2, 0, @g_buffer.width, @g_buffer.height / 2,
-                        GL_COLOR_BUFFER_BIT, GL_LINEAR)
+            glDrawArrays(GL_TRIANGLES, 0, @g_buffer.vertices.size)
+
+            glDisableVertexAttribArray(1)
+            glDisableVertexAttribArray(0)
+            glBindVertexArray(0)
+          end
+
+          gl_error?
+        end
+      end
     end
 
     def post_processing
@@ -131,7 +126,7 @@ class IMICFPS
           glEnable(GL_BLEND)
 
           glActiveTexture(GL_TEXTURE0)
-          glBindTexture(GL_TEXTURE_2D, @g_buffer.texture(:diffuse))
+          glBindTexture(GL_TEXTURE_2D, @g_buffer.texture(:scene))
 
           glDrawArrays(GL_TRIANGLES, 0, @g_buffer.vertices.size)
 

lib/renderer/renderer.rb

@@ -10,7 +10,7 @@ class IMICFPS
     end
 
     def preload_default_shaders
-      shaders = ["default", "render_screen"]
+      shaders = ["default", "render_screen", "lighting"]
       shaders.each do |shader|
         Shader.new(
           name: shader,

shaders/fragment/default.glsl

@@ -1,19 +1,15 @@
 # version 330 core
 
-@include "light_struct"
-
-layout(location  = 0) out vec3 fragPosition;
+layout (location = 0) out vec4 fragPosition;
 layout (location = 1) out vec4 fragColor;
-layout (location = 2) out vec3 fragNormal;
-layout (location = 3) out vec3 fragUV;
+layout (location = 2) out vec4 fragNormal;
+layout (location = 3) out vec4 fragUV;
 
 in vec3 outPosition;
 in vec3 outColor;
 in vec3 outNormal;
 in vec3 outUV;
 in float outTextureID;
-in Light outLights[MAX_LIGHTS];
-flat in int outTotalLights;
 in vec3 outFragPos;
 in vec3 outCameraPos;
 flat in int outHasTexture;
@@ -21,88 +17,17 @@ flat in int outDisableLighting;
 
 uniform sampler2D diffuse_texture;
 
-// optimizing compilers are annoying at this stage of my understanding of GLSL
-vec4 lokiVar;
-
-// https://learnopengl.com/Lighting/Multiple-lights
-vec3 calculatePointLight(Light light) {
-  vec3 viewDir = normalize(outCameraPos - outFragPos);
-  vec3 lightDir = normalize(light.position - outFragPos);
-  float diff = max(dot(vec3(outNormal), lightDir), 0.0);
-  vec3 reflectDir = reflect(-lightDir, vec3(outNormal));
-  float spec = pow(max(dot(viewDir, reflectDir), 0.0), 16.0);
-
-  float distance    = length(light.position - outFragPos);
-  float attenuation = 1.0 / (1.0 + 0.09 * distance +
-                      0.032 * (distance * distance));
-
-  vec3 ambient  = light.ambient  * outColor;
-  vec3 diffuse  = light.diffuse  * outColor;
-  vec3 specular = light.specular * spec * vec3(1.0, 1.0, 1.0);
-
-  ambient  *= attenuation;
-  diffuse  *= attenuation;
-  specular *= attenuation;
-
-  return (ambient + diffuse + specular);
-}
-
-// https://learnopengl.com/Lighting/Basic-Lighting
-vec3 calculateBasicLight(Light light) {
-  vec3 lightDir = normalize(light.position - outFragPos);
-
-  float ambientStrength = 0.25;
-  vec3 ambient = ambientStrength * light.ambient;
-
-  float diff = max(dot(normalize(vec3(outNormal)), lightDir), 0.0);
-  vec3 diffuse = diff * light.diffuse;
-
-  float specularStrength = 0.5;
-  vec3 viewDir = normalize(outCameraPos - outFragPos);
-  vec3 reflectDir = reflect(-lightDir, outNormal);
-  float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32);
-  vec3 specular = specularStrength * spec * light.specular;
-
-  return vec3(ambient + diffuse + specular);
-}
-
-vec3 calculateLighting() {
-  vec3 result = vec3(0.0, 0.0, 0.0);
-
-  for (int i = 0; i < min(outTotalLights, MAX_LIGHTS); i++) {
-    if (int(outLights[i].type) == 0) {
-      result += calculateBasicLight(outLights[i]);
-    } else if (int(outLights[i].type) == 1) {
-      result += calculateBasicLight(outLights[i]);
-    }
-  }
-
-  return result;
-}
-
 void main() {
-  lokiVar = vec4(outColor, 1.0) + vec4(outNormal, 1.0) + vec4(outUV, 1.0) + vec4(outTextureID, 1.0, 1.0, 1.0);
-  lokiVar = normalize(lokiVar);
-
   vec3 result;
 
   if (outHasTexture == 0) {
-    if (outDisableLighting == 1.0) {
-      result = outColor + 0.25;
-    } else {
-      result = calculateLighting() * outColor;
-    }
-
+      result = outColor;
   } else {
-    if (outDisableLighting == 1.0) {
-      result = texture(diffuse_texture, outUV.xy).xyz + 0.25;
-    } else {
-      result = calculateLighting() * texture(diffuse_texture, outUV.xy).xyz;
-    }
+    result = texture(diffuse_texture, outUV.xy).xyz;
   }
 
-  fragPosition = outPosition;
+  fragPosition = vec4(outPosition, 1.0);
   fragColor = vec4(result, 1.0);
-  fragNormal = outNormal;
-  fragUV = outUV;
+  fragNormal = vec4(outNormal, 1.0);
+  fragUV = vec4(outUV, 1.0);
 }

shaders/fragment/lighting.glsl

@@ -0,0 +1,17 @@
+# version 330 core
+
+layout (location = 4) out vec4 sceneColor;
+
+flat in int outLightType;
+in vec3 outLightPosition;
+in vec3 outLightAmbient;
+in vec3 outLightDiffuse;
+in vec3 outLightSpecular;
+
+in vec2 outTexCoords;
+
+@include "light_struct"
+
+void main() {
+  sceneColor = vec4(1.0, 0.5, 0.25, 1.0);
+}

shaders/vertex/default.glsl

@@ -39,8 +39,6 @@ void main() {
   outUV    = inUV;
   outTextureID = inTextureID;
   outHasTexture = hasTexture;
-  outLights = lights;
-  outTotalLights = totalLights;
   outCameraPos = cameraPos;
   outDisableLighting = disableLighting;
 

shaders/vertex/lighting.glsl

@@ -0,0 +1,28 @@
+#version 330 core
+layout (location = 0) in vec3 inPosition;
+layout (location = 1) in vec2 inTexCoords;
+
+in int  inLightType;
+in vec3 inLightPosition;
+in vec3 inLightAmbient;
+in vec3 inLightDiffuse;
+in vec3 inLightSpecular;
+
+flat out int outLightType;
+out vec3 outLightPosition;
+out vec3 outLightAmbient;
+out vec3 outLightDiffuse;
+out vec3 outLightSpecular;
+
+out vec2 outTexCoords;
+
+void main() {
+  gl_Position = vec4(inPosition.x, inPosition.y, inPosition.z, 1.0);
+
+  outLightType = inLightType;
+  outLightPosition = inLightPosition;
+  outLightAmbient = inLightAmbient;
+  outLightDiffuse = inLightDiffuse;
+  outLightSpecular = inLightSpecular;
+  outTexCoords = inTexCoords;
+}

shaders/vertex/render_screen.glsl

@@ -5,6 +5,6 @@ layout (location = 1) in vec2 inTexCoords;
 out vec2 outTexCoords;
 
 void main() {
-  gl_Position = vec4(inPosition.x, inPosition.y, inPosition.z, 1.0); 
+  gl_Position = vec4(inPosition.x, inPosition.y, inPosition.z, 1.0);
   outTexCoords = inTexCoords;
-}  
+}