diff --git a/crtpi.glsl b/crtpi.glsl
index 067a4fb..7739b85 100644
--- a/crtpi.glsl
+++ b/crtpi.glsl
@@ -41,7 +41,7 @@ MASK_TYPE defines what, if any, shadow mask to use. MASK_BRIGHTNESS defines how
 #define MULTISAMPLE
 #define GAMMA
 //#define FAKE_GAMMA
-//#define CURVATURE
+#define CURVATURE
 //#define SHARPER
 // MASK_TYPE: 0 = none, 1 = green/magenta, 2 = trinitron(ish)
 #define MASK_TYPE 1
@@ -64,8 +64,8 @@ uniform COMPAT_PRECISION float BLOOM_FACTOR;
 uniform COMPAT_PRECISION float INPUT_GAMMA;
 uniform COMPAT_PRECISION float OUTPUT_GAMMA;
 #else
-#define CURVATURE_X 0.10
-#define CURVATURE_Y 0.25
+#define CURVATURE_X 0.25
+#define CURVATURE_Y 0.45
 #define MASK_BRIGHTNESS 0.70
 #define SCANLINE_WEIGHT 6.0
 #define SCANLINE_GAP_BRIGHTNESS 0.12
@@ -78,7 +78,7 @@ uniform COMPAT_PRECISION float OUTPUT_GAMMA;
    - GLSL compilers
 */
 
-uniform vec2 TextureSize;
+//uniform vec2 TextureSize;
 #if defined(CURVATURE)
 varying vec2 screenScale;
 #endif
@@ -86,20 +86,20 @@ varying vec2 TEX0;
 varying float filterWidth;
 
 #if defined(VERTEX)
-uniform mat4 MVPMatrix;
-attribute vec4 VertexCoord;
-attribute vec2 TexCoord;
-uniform vec2 InputSize;
-uniform vec2 OutputSize;
+//uniform mat4 MVPMatrix;
+//attribute vec4 VertexCoord;
+//attribute vec2 TexCoord;
+//uniform vec2 InputSize;
+//uniform vec2 OutputSize;
 
 void main()
 {
 #if defined(CURVATURE)
-	screenScale = TextureSize / InputSize;
+	screenScale = vec2(1.0, 1.0); //TextureSize / InputSize;
 #endif
-	filterWidth = (InputSize.y / OutputSize.y) / 3.0;
-	TEX0 = TexCoord*1.0001;
-	gl_Position = MVPMatrix * VertexCoord;
+	filterWidth = (768.0 / 240.0) / 3.0;
+	TEX0 = vec2(gl_MultiTexCoord0.x, 1.0-gl_MultiTexCoord0.y)*1.0001;
+	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
 }
 #elif defined(FRAGMENT)
 
@@ -146,6 +146,7 @@ float CalcScanLine(float dy)
 
 void main()
 {
+	vec2 TextureSize = vec2(320.0, 240.0);
 #if defined(CURVATURE)
 	vec2 texcoord = Distort(TEX0);
 	if (texcoord.x < 0.0)
diff --git a/main.cpp b/main.cpp
index 9a3372c..52281c5 100644
--- a/main.cpp
+++ b/main.cpp
@@ -21,8 +21,8 @@
 #include <SDL2/SDL_opengl_glext.h>
 #endif
 
-const int WIN_WIDTH = 640;
-const int WIN_HEIGHT = 480;
+const int WIN_WIDTH = 1024;
+const int WIN_HEIGHT = 768;
 
 const int WORLD_WIDTH = 320;
 const int WORLD_HEIGHT = 240;
@@ -81,8 +81,11 @@ GLuint compileShader(const char* source, GLuint shaderType) {
 	//std::cout << "Compilando shader:" << std::endl << source << std::endl;
 	// Create ID for shader
 	GLuint result = glCreateShader(shaderType);
+
+	const char *sources[2] = { shaderType==GL_VERTEX_SHADER?"#define VERTEX\n":"#define FRAGMENT\n", source };
+
 	// Define shader text
-	glShaderSource(result, 1, &source, NULL);
+	glShaderSource(result, 2, sources, NULL);
 	// Compile shader
 	glCompileShader(result);
 
@@ -118,9 +121,6 @@ GLuint compileProgram(const char* vtxFile, const char* fragFile) {
 	std::string source((std::istreambuf_iterator<char>(f)),
 						std::istreambuf_iterator<char>());
 
-	/*const char *sources[2] = { "#define VERTEX\n", source.c_str() };
-	glShaderSourceARB(shader, 2, sources, NULL);*/
-
 	vtxShaderId = compileShader(source.c_str(), GL_VERTEX_SHADER);
 	
 	f=std::ifstream(fragFile);
@@ -159,6 +159,8 @@ void presentBackBuffer(SDL_Renderer *renderer, SDL_Window* win, SDL_Texture* bac
 	GLint oldProgramId;
 	// Guarrada para obtener el textureid (en driverdata->texture)
 	//Detach the texture
+	SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
+
 	SDL_SetRenderTarget(renderer, NULL);
 	SDL_RenderClear(renderer);
 
@@ -291,6 +293,7 @@ int main(int argc, char **argv){
 
 	while ( ! done ) {
 		//Render to the texture
+	SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
 		SDL_SetRenderTarget(renderer, texTarget);
 		SDL_RenderClear(renderer);