*屏幕特效(post processing)

18 files changed, 144 insertions, 57 deletions

diff --git a/bin/SDL2.dll b/bin/SDL2.dll
index 15fa57c..b73575b 100644
--- a/bin/SDL2.dll
+++ b/bin/SDL2.dll
diff --git a/bin/cembed.exe b/bin/cembed.exe
index e30b730..0a0bb5a 100644
--- a/bin/cembed.exe
+++ b/bin/cembed.exe
diff --git a/bin/game/main.lua b/bin/game/main.lua
index ce5b62c..3ce17a0 100644
--- a/bin/game/main.lua
+++ b/bin/game/main.lua
@@ -20,7 +20,11 @@ end
 local particle_sprites = {}
 local Pi = 3.1415
 local sinShader = nil
+local screen = nil
+local pp = nil
+local pixel = nil 
 function jin.core.onLoad()
+	screen = jin.graphics.newCanvas(jin.graphics.getSize())
 	-- bitmap = jin.graphics.newBitmap(200, 200, function(w, h, x, y)
 		-- return {255*math.sin(x/w),255 - 255,255*math.cos(y/w),255}
 	-- end)
@@ -103,6 +107,54 @@ function jin.core.onLoad()
 		}
 		#END_FRAGMENT_SHADER
     ]]
+	
+	pp = jin.graphics.newShader[[ 
+		#VERTEX_SHADER
+		Vertex vert(Vertex v)
+		{
+			return v;
+		}
+		#END_VERTEX_SHADER
+		#FRAGMENT_SHADER
+		Color frag(Color col, Texture tex, Vertex v)
+		{
+			v.uv.x += sin(v.uv.y * 4 * 2 * 3.14 + jin_Time.x) / (10 + sin(jin_Time.x) * 10);
+			return texel(tex, v.uv);
+		}
+		#END_FRAGMENT_SHADER
+	]]
+	
+	pixel = jin.graphics.newShader[[ 
+		#VERTEX_SHADER
+		Vertex vert(Vertex v)
+		{
+			return v;
+		}
+		#END_VERTEX_SHADER
+		#FRAGMENT_SHADER
+		Color frag(Color col, Texture tex, Vertex v)
+		{
+			// config 
+			float pixel_w = 10.0;
+			float pixel_h = 10.0;
+			
+			vec2 uv = v.uv;
+			vec3 tc = vec3(1.0, 0.0, 0.0);
+			if(uv.x < abs(sin(jin_Time.x)))
+			{
+				float dx = pixel_w*(1.0/jin_RenderTargetSize.x);
+				float dy = pixel_h*(1.0/jin_RenderTargetSize.y);
+				vec2 coord = vec2(dx*floor(uv.x/dx),dy*floor(uv.y/dy));
+				tc = texel(tex, coord).rgb;
+			}
+			else 
+			{
+				tc = texel(tex, uv).rgb;
+			}
+			return vec4(tc, 1.0);
+		}
+		#END_FRAGMENT_SHADER
+	]] 
     
     jin.log.info("test")
     
@@ -127,6 +179,11 @@ function jin.core.onEvent(e)
     if e.type == "Quit" then 
         jin.core.stop()
     end
+	if e.type == "MouseButtonDown" then 
+		if e.button == "Left" then 
+			ps:setPosition(e.x, e.y)
+		end 
+	end 
 end
 
 local t = 0
@@ -142,6 +199,8 @@ function jin.core.onUpdate(dt)
 end
 
 function jin.core.onDraw()
+	jin.graphics.bindCanvas(screen)
+	jin.graphics.clear()
     jin.graphics.useShader(jin.graphics.Shaders.Shape)
     jin.graphics.setColor(255, 0, 255, 255)
     jin.graphics.rect(jin.graphics.RenderMode.FILL, 30, 50, 100, 200)
@@ -166,4 +225,9 @@ function jin.core.onDraw()
     jin.graphics.unuseShader()
     jin.graphics.setColor(255, 255, 255, 255)
     jin.graphics.print(jin.graphics.getStatsStr(), 450, 10)
+	
+	jin.graphics.unbindCanvas(screen)
+	jin.graphics.useShader(pixel)
+	jin.graphics.draw(screen, 0, 0)
+	jin.graphics.unuseShader()
 end
\ No newline at end of file
diff --git a/bin/jin.exe b/bin/jin.exe
index d4c075e..e9e8f37 100644
--- a/bin/jin.exe
+++ b/bin/jin.exe
diff --git a/bin/lua51.dll b/bin/lua51.dll
index 7b534e6..5ec2ae0 100644
--- a/bin/lua51.dll
+++ b/bin/lua51.dll
diff --git a/src/libjin-lua/scripts/app.lua b/src/libjin-lua/scripts/app.lua
index d4f2e59..261ae28 100644
--- a/src/libjin-lua/scripts/app.lua
+++ b/src/libjin-lua/scripts/app.lua
@@ -113,7 +113,7 @@ jin.audio.init()
 
 jin.graphics.init(jin.config)
 
-jin.log.info("Start game...")
+jin.log.info("================== Start game ==================")
 
 -------------------------------------------------------------------------
 -- Boot game
@@ -125,7 +125,7 @@ xpcall(boot, onError)
 -- Destroy sub-systems
 -------------------------------------------------------------------------
 
-jin.log.info("Quit...")
+jin.log.info("================== Quit game ==================")
 
 jin.graphics.destroy()
 
diff --git a/src/libjin-lua/scripts/app.lua.h b/src/libjin-lua/scripts/app.lua.h
index 7b981d2..863b49f 100644
--- a/src/libjin-lua/scripts/app.lua.h
+++ b/src/libjin-lua/scripts/app.lua.h
@@ -173,38 +173,42 @@ static char app_lua[] = {
 100,105,111,46,105,110,105,116,40,41,13,10,13,10,106,105,110,46,103,114,
 97,112,104,105,99,115,46,105,110,105,116,40,106,105,110,46,99,111,110,102,
 105,103,41,13,10,13,10,106,105,110,46,108,111,103,46,105,110,102,111,40,
-34,83,116,97,114,116,32,103,97,109,101,46,46,46,34,41,13,10,13,10,
+34,61,61,61,61,61,61,61,61,61,61,61,61,61,61,61,61,61,61,32,
+83,116,97,114,116,32,103,97,109,101,32,61,61,61,61,61,61,61,61,61,
+61,61,61,61,61,61,61,61,61,34,41,13,10,13,10,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
-45,45,45,45,45,45,45,45,45,45,45,45,45,13,10,45,45,32,66,111,
-111,116,32,103,97,109,101,13,10,45,45,45,45,45,45,45,45,45,45,45,
+45,45,45,45,45,45,45,45,13,10,45,45,32,66,111,111,116,32,103,97,
+109,101,13,10,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
+45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,13,10,13,
+10,120,112,99,97,108,108,40,98,111,111,116,44,32,111,110,69,114,114,111,
+114,41,13,10,13,10,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
-45,45,13,10,13,10,120,112,99,97,108,108,40,98,111,111,116,44,32,111,
-110,69,114,114,111,114,41,13,10,13,10,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
+45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,13,
+10,45,45,32,68,101,115,116,114,111,121,32,115,117,98,45,115,121,115,116,
+101,109,115,13,10,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
-45,45,45,45,13,10,45,45,32,68,101,115,116,114,111,121,32,115,117,98,
-45,115,121,115,116,101,109,115,13,10,45,45,45,45,45,45,45,45,45,45,
+45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,13,10,
+13,10,106,105,110,46,108,111,103,46,105,110,102,111,40,34,61,61,61,61,
+61,61,61,61,61,61,61,61,61,61,61,61,61,61,32,81,117,105,116,32,
+103,97,109,101,32,61,61,61,61,61,61,61,61,61,61,61,61,61,61,61,
+61,61,61,34,41,13,10,13,10,106,105,110,46,103,114,97,112,104,105,99,
+115,46,100,101,115,116,114,111,121,40,41,13,10,13,10,106,105,110,46,97,
+117,100,105,111,46,100,101,115,116,114,111,121,40,41,13,10,13,10,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
-45,45,45,13,10,13,10,106,105,110,46,108,111,103,46,105,110,102,111,40,
-34,81,117,105,116,46,46,46,34,41,13,10,13,10,106,105,110,46,103,114,
-97,112,104,105,99,115,46,100,101,115,116,114,111,121,40,41,13,10,13,10,
-106,105,110,46,97,117,100,105,111,46,100,101,115,116,114,111,121,40,41,13,
-10,13,10,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
+45,45,45,45,45,45,45,45,45,45,45,13,10,45,45,32,81,117,105,116,
+32,103,97,109,101,13,10,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
-45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,13,10,45,45,
-32,81,117,105,116,32,103,97,109,101,13,10,45,45,45,45,45,45,45,45,
 45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
-45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
-45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
-45,45,45,45,45,13,10,13,10,106,105,110,46,99,111,114,101,46,113,117,
-105,116,40,41,13,10
+13,10,13,10,106,105,110,46,99,111,114,101,46,113,117,105,116,40,41,13,
+10
 };
 
diff --git a/src/libjin/graphics/je_canvas.cpp b/src/libjin/graphics/je_canvas.cpp
index ba7919e..d52bdfd 100644
--- a/src/libjin/graphics/je_canvas.cpp
+++ b/src/libjin/graphics/je_canvas.cpp
@@ -22,10 +22,11 @@ namespace JinEngine
             GLint current_fbo;
             glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &current_fbo);
 
-            // Generate a new render buffer object 
+            // Generate a new render buffer object.
             fbo = gl.genFrameBuffer();
             gl.bindFrameBuffer(fbo);
 
+            // Render texture.
             GLuint texture = getGLTexture();
             gl.bindTexture(texture);
             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
@@ -33,7 +34,6 @@ namespace JinEngine
             gl.texImage(GL_RGBA8, w, h, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
             gl.bindTexture(0);
             glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
-
             GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
 
             // Unbind framebuffer
diff --git a/src/libjin/graphics/je_canvas.h b/src/libjin/graphics/je_canvas.h
index b65e598..dc0a59e 100644
--- a/src/libjin/graphics/je_canvas.h
+++ b/src/libjin/graphics/je_canvas.h
@@ -23,7 +23,7 @@ namespace JinEngine
             static bool isBinded(const Canvas*);
 
             /// 
-            /// 
+            /// Default canvas, aka screen.
             /// 
             Canvas(GLuint n);
 
diff --git a/src/libjin/graphics/je_gl.cpp b/src/libjin/graphics/je_gl.cpp
index 24b0a48..aeaa663 100644
--- a/src/libjin/graphics/je_gl.cpp
+++ b/src/libjin/graphics/je_gl.cpp
@@ -18,7 +18,7 @@ namespace JinEngine
 
         OpenGL gl;
 
-        const Canvas* const OpenGL::DEFAULT_CANVAS = new Canvas(0);
+        Canvas* const OpenGL::DEFAULT_CANVAS = new Canvas(0);
 
         OpenGL::OpenGL()
             : mBlendMode(BlendMode::NONE)
@@ -262,6 +262,7 @@ namespace JinEngine
             case BlendMode::ADDITIVE:
                 srcRGB = GL_SRC_ALPHA;
                 dstRGB = GL_ONE;
+                dstA = GL_ONE;
                 break;
             case BlendMode::PREMULTIPLIEDALPHA:
                 srcRGB = srcA = GL_ONE;
@@ -316,6 +317,11 @@ namespace JinEngine
 
                 mCanvas = canvas;
 
+                gl.enable(GL_BLEND);
+                gl.enable(GL_TEXTURE_2D);
+
+                gl.setBlendMode(OpenGL::BlendMode::ALPHA);
+
                 ++mStats.canvasSwitches;
             }
         }
@@ -340,7 +346,7 @@ namespace JinEngine
             glViewport(0, 0, w, h);
             gl.setProjectionMatrix(0, w, h, 0, -1, 1);
 
-            mCanvas = nullptr;
+            mCanvas = DEFAULT_CANVAS;
         }
 
         Canvas* OpenGL::getCanvas()
diff --git a/src/libjin/graphics/je_gl.h b/src/libjin/graphics/je_gl.h
index 21aa900..d6edc2f 100644
--- a/src/libjin/graphics/je_gl.h
+++ b/src/libjin/graphics/je_gl.h
@@ -51,6 +51,8 @@ namespace JinEngine
                 //int64 textureMemory;
             };
 
+            static Canvas* const DEFAULT_CANVAS;
+
             OpenGL();
             ~OpenGL();
 
@@ -210,8 +212,6 @@ namespace JinEngine
 
         private:
 
-            static const Canvas* const DEFAULT_CANVAS;
-
             ///
             ///
             ///
diff --git a/src/libjin/graphics/je_graphic.cpp b/src/libjin/graphics/je_graphic.cpp
index 96c3b4a..18dbf42 100644
--- a/src/libjin/graphics/je_graphic.cpp
+++ b/src/libjin/graphics/je_graphic.cpp
@@ -72,10 +72,10 @@ namespace JinEngine
             // Set shader.
             Shader* shader = gl.getShader();
             shader->prepare()
-            .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelViewMatrix)
-            .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix())
-            .uploadVertices(2, GL_FLOAT, 0, vertexCoords)
-            .uploadUV(2, GL_FLOAT, 0, textureCoords);
+                .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelViewMatrix)
+                .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix())
+                .uploadVertices(2, GL_FLOAT, 0, vertexCoords)
+                .uploadUV(2, GL_FLOAT, 0, textureCoords);
 
             gl.bindTexture(getGLTexture());
             gl.drawArrays(GL_QUADS, 0, 4);
@@ -106,10 +106,10 @@ namespace JinEngine
 
             Shader* shader = gl.getShader();
             shader->prepare()
-            .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelViewMatrix)
-            .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix())
-            .uploadVertices(2, GL_FLOAT, 0, vertexCoords)
-            .uploadUV(2, GL_FLOAT, 0, textureCoords);
+                .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelViewMatrix)
+                .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix())
+                .uploadVertices(2, GL_FLOAT, 0, vertexCoords)
+                .uploadUV(2, GL_FLOAT, 0, textureCoords);
 
             gl.bindTexture(getGLTexture());
             gl.drawArrays(GL_QUADS, 0, 4);
diff --git a/src/libjin/graphics/je_mesh.cpp b/src/libjin/graphics/je_mesh.cpp
index e8512ac..2d453b0 100644
--- a/src/libjin/graphics/je_mesh.cpp
+++ b/src/libjin/graphics/je_mesh.cpp
@@ -61,11 +61,11 @@ namespace JinEngine
 
             Shader* shader = gl.getShader();
             shader->prepare()
-            .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelViewMatrix)
-            .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix())
-            .uploadVertices(2, GL_FLOAT, sizeof(Vertex), &(mVertices[0].xy))
-            .uploadUV(2, GL_FLOAT, sizeof(Vertex), &(mVertices[0].uv))
-            .uploadColor(4, GL_UNSIGNED_BYTE, sizeof(Vertex), &(mVertices[0].color), GL_TRUE);
+                .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelViewMatrix)
+                .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix())
+                .uploadVertices(2, GL_FLOAT, sizeof(Vertex), &(mVertices[0].xy))
+                .uploadUV(2, GL_FLOAT, sizeof(Vertex), &(mVertices[0].uv))
+                .uploadColor(4, GL_UNSIGNED_BYTE, sizeof(Vertex), &(mVertices[0].color), GL_TRUE);
 
             gl.bindTexture(mGraphic->getGLTexture());
             gl.drawArrays(GL_POLYGON, 0, mVertices.size());
diff --git a/src/libjin/graphics/je_shapes.cpp b/src/libjin/graphics/je_shapes.cpp
index 8bfb1ef..ce5c7e7 100644
--- a/src/libjin/graphics/je_shapes.cpp
+++ b/src/libjin/graphics/je_shapes.cpp
@@ -26,9 +26,9 @@ namespace JinEngine
 
             Shader* shader = gl.getShader();
             shader->prepare()
-            .uploadVertices(2, GL_FLOAT, 0, verts)
-            .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
-            .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix());
+                .uploadVertices(2, GL_FLOAT, 0, verts)
+                .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
+                .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix());
 
             gl.drawArrays(GL_POINTS, 0, 1);
         }
@@ -39,9 +39,9 @@ namespace JinEngine
 
             Shader* shader = gl.getShader();
             shader->prepare()
-            .uploadVertices(2, GL_SHORT, 0, p)
-            .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
-            .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix());
+                .uploadVertices(2, GL_SHORT, 0, p)
+                .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
+                .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix());
         
             gl.drawArrays(GL_POINTS, 0, n);
         }
@@ -57,9 +57,9 @@ namespace JinEngine
         
             Shader* shader = gl.getShader();
             shader->prepare()
-            .uploadVertices(2, GL_FLOAT, 0, verts)
-            .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
-            .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix());
+                .uploadVertices(2, GL_FLOAT, 0, verts)
+                .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
+                .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix());
         
             gl.drawArrays(GL_LINES, 0, 2);
         }
@@ -106,9 +106,9 @@ namespace JinEngine
             Shader* shader = gl.getShader();
             Matrix modelMatrix = gl.getModelViewMatrix();
             shader->prepare()
-            .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
-            .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix())
-            .uploadVertices(2, GL_FLOAT, 0, p);
+                .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
+                .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix())
+                .uploadVertices(2, GL_FLOAT, 0, p);
 
             gl.drawArrays(GL_LINE_LOOP, 0, count);
         }
@@ -124,9 +124,9 @@ namespace JinEngine
                 Shader* shader = gl.getShader();
                 Matrix modelMatrix = gl.getModelViewMatrix();
                 shader->prepare()
-                .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
-                .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix())
-                .uploadVertices(2, GL_FLOAT, 0, p);
+                    .sendMatrix4(SHADER_MODELVIEW_MATRIX, &modelMatrix)
+                    .sendMatrix4(SHADER_PROJECTION_MATRIX, &gl.getProjectionMatrix())
+                    .uploadVertices(2, GL_FLOAT, 0, p);
 
                 gl.drawArrays(GL_POLYGON, 0, count);
             }
diff --git a/src/libjin/graphics/je_window.cpp b/src/libjin/graphics/je_window.cpp
index 1ce3901..49877e3 100644
--- a/src/libjin/graphics/je_window.cpp
+++ b/src/libjin/graphics/je_window.cpp
@@ -88,7 +88,7 @@ namespace JinEngine
             SDL_GL_SetSwapInterval(vsync ? 1 : 0);
             SDL_GL_MakeCurrent(mWnd, ctx);
             // Default configuration.
-            gl.setClearColor(0, 0, 0, 0xff);
+            gl.setClearColor(0, 0, 0, 0);
             glClear(GL_COLOR_BUFFER_BIT);
             gl.setColor(0xff, 0xff, 0xff, 0xff);
             gl.enable(GL_BLEND);
diff --git a/src/libjin/graphics/shaders/je_jsl_compiler.cpp b/src/libjin/graphics/shaders/je_jsl_compiler.cpp
index 8aacdd0..c5a004e 100644
--- a/src/libjin/graphics/shaders/je_jsl_compiler.cpp
+++ b/src/libjin/graphics/shaders/je_jsl_compiler.cpp
@@ -45,6 +45,7 @@ namespace JinEngine
             JinEngine::String SHADER_TEXTURE_COORDS = "jin_TextureCoords";
             JinEngine::String SHADER_VERTEX_COLOR = "jin_VertexColor";
             JinEngine::String SHADER_TIME = "jin_Time";
+            JinEngine::String SHADER_RENDERTARGET_SIZE = "jin_RenderTargetSize";
             JinEngine::String SHADER_VERSION = "#version 130 core \n";
             JinEngine::String SHADER_DEFINITIONS =
                 // Types
@@ -69,7 +70,8 @@ namespace JinEngine
                 "uniform Texture " + SHADER_MAIN_TEXTURE + "; \n"
                 "uniform mat4 " + SHADER_PROJECTION_MATRIX + "; \n"
                 "uniform mat4 " + SHADER_MODELVIEW_MATRIX + "; \n"
-                "uniform vec2 " + SHADER_TIME + "; \n";
+                "uniform vec2 " + SHADER_TIME + "; \n"
+                "uniform vec2 " + SHADER_RENDERTARGET_SIZE + "; \n";
 
             JinEngine::String JSLCompiler::formatVertexShader(const JinEngine::String& vert)
             {
diff --git a/src/libjin/graphics/shaders/je_jsl_compiler.h b/src/libjin/graphics/shaders/je_jsl_compiler.h
index 75c92cf..c61e152 100644
--- a/src/libjin/graphics/shaders/je_jsl_compiler.h
+++ b/src/libjin/graphics/shaders/je_jsl_compiler.h
@@ -23,6 +23,7 @@ namespace JinEngine
             extern JinEngine::String SHADER_TEXTURE_COORDS;
             extern JinEngine::String SHADER_VERTEX_COLOR;
             extern JinEngine::String SHADER_TIME;
+            extern JinEngine::String SHADER_RENDERTARGET_SIZE;
 
             ///
             /// Compile JSL into GLSL.
diff --git a/src/libjin/graphics/shaders/je_shader.cpp b/src/libjin/graphics/shaders/je_shader.cpp
index 5668168..4fa3b9e 100644
--- a/src/libjin/graphics/shaders/je_shader.cpp
+++ b/src/libjin/graphics/shaders/je_shader.cpp
@@ -8,6 +8,7 @@
 #include "../../utils/je_macros.h"
 
 #include "../je_gl.h"
+#include "../je_window.h"
 
 #include "je_jsl_compiler.h"
 #include "je_shader.h"
@@ -78,6 +79,15 @@ namespace JinEngine
                 // Send uniforms.
                 sendInt(SHADER_MAIN_TEXTURE, DEFAULT_TEXTURE_UNIT);
                 sendVec2(SHADER_TIME, Time::getSecond(), Time::getDeltaTime());
+                Canvas* rt = gl.getCanvas();
+                if (rt == OpenGL::DEFAULT_CANVAS)
+                {
+                    sendVec2(SHADER_RENDERTARGET_SIZE, Window::get()->getW(), Window::get()->getH());
+                }
+                else if(rt != nullptr)
+                {
+                    sendVec2(SHADER_RENDERTARGET_SIZE, rt->getWidth(), rt->getHeight());
+                }
                 // Reset attribute index.
                 mAttributeIndex = 0;
                 return *this;