Tri-Map working now; output of every state in a different color

opengl-test-two/main.cpp

@@ -251,12 +251,18 @@ int main(int argc, char* args[]) {
 
 
 
-    tex_jpe=LoadTexture("../img/tests/test.bmp",&textw,&texth);
+    tex_jpe=LoadTexture("../img/tests/test.png",&textw,&texth);
 
     GLuint programID = LoadShaders("trimap.vertexshader", "trimap.fragmentshader");
-    printf("%d", programID);
-    GLint textureLocation = glGetUniformLocationARB(programID, "myTextureSampler");
-    glUniform1i(textureLocation, tex_jpe);
+    GLint textureLocation = glGetUniformLocation(programID, "myTextureSampler");
+    GLint widthLocation = glGetUniformLocation(programID, "pixWidth");
+    GLint heigthLocation = glGetUniformLocation(programID, "pixHeight");
+    printf("Shader program ID: %d\n", programID);
+    printf("textureLocation: %d\n", textureLocation);
+    printf("widthLocation: %d\n", widthLocation);
+    printf("heigthLocation: %d\n", heigthLocation);
+    printf("Width: %f\n", 1.0f/textw);
+    printf("Height: %f\n", 1.0f/texth);
 
 
 
@@ -270,7 +276,8 @@ int main(int argc, char* args[]) {
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
         glUseProgram(programID);
-
+        glUniform1f(widthLocation, 1.0f/textw);
+        glUniform1f(heigthLocation, 1.0f/texth);
         // 1rst attribute buffer : vertices
         glEnableVertexAttribArray(0);
         glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
@@ -286,12 +293,12 @@ int main(int argc, char* args[]) {
         glEnableVertexAttribArray(1);
         glBindBuffer(GL_ARRAY_BUFFER, colorbuffer);
         glVertexAttribPointer(
-            1,                                // attribute. No particular reason for 1, but must match the layout in the shader.
-            2,                                // size
-            GL_FLOAT,                         // type
-            GL_FALSE,                         // normalized?
-            0,                                // stride
-            (void*)0                          // array buffer offset
+            1,                 // attribute. No particular reason for 1, but must match the layout in the shader.
+            2,                 // size
+            GL_FLOAT,          // type
+            GL_FALSE,          // normalized?
+            0,                 // stride
+            (void*)0           // array buffer offset
         );
 
 

opengl-test-two/opengl-test-two.depend

@@ -2,7 +2,7 @@
 1385320478 source:d:\owncloud\documents\programmierung\cpp\opengl-test-two\main.cpp
 	<iostream>
 
-1473097371 source:d:\owncloud\documents\programmierung\cpp\imanox-chroma-matting\opengl-test-two\main.cpp
+1473106263 source:d:\owncloud\documents\programmierung\cpp\imanox-chroma-matting\opengl-test-two\main.cpp
 	<GL/glew.h>
 	<GLFW/glfw3.h>
 	<SDL2/SDL.h>

opengl-test-two/trimap.fragmentshader

@@ -8,10 +8,71 @@ out vec3 color;
 
 // Values that stay constant for the whole mesh.
 uniform sampler2D myTextureSampler;
+//uniform float pixWidth;
+//uniform float pixHeight;
 
-void main(){
 
-    // Output color = color of the texture at the specified UV
-    color = texture( myTextureSampler, UV ).rgb;
+
+
+
+int IS_BACKGROUND = 0;
+int IS_UNDEFINED = 1;
+int IS_FOREGROUND = 2;
+int UNSET = -1;
+
+
+vec3 getColor(vec2 uvCoord) {
+    return texture(myTextureSampler, uvCoord).rgb;
 }
 
+bool isBackground(vec3 c) {
+    // 49,206, 11
+    if (all(   lessThanEqual(c, vec3(51.0f/255.0f, 208.0f/255.0f, 13.0f/255.0f))) &&
+        all(greaterThanEqual(c, vec3(47.0f/255.0f, 204.0f/255.0f, 9.0f/255.0f)))
+        ) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
+void main(){
+    float pixWidth = 0.001174f;
+    float pixHeight = 0.002083f;
+    int status = UNSET;
+    float pw = pixWidth;
+    float ph = pixHeight;
+
+    // Output color = color of the texture at the specified UV
+    for(int w=-5;w<=5;w++){
+        for(int h=-5;h<=5;h++){
+            if (w+h==-10) { // first pixel
+                if (isBackground(getColor(UV+vec2(pixWidth*w,pixHeight*h)))) {
+                    status = IS_BACKGROUND;
+                } else {
+                    status = IS_FOREGROUND;
+                }
+            } else { // other pixels
+                if (isBackground(getColor(UV+vec2(pixWidth*w,pixHeight*h)))) {
+                    if (status != IS_BACKGROUND) {
+                        status = IS_UNDEFINED;
+                        break;
+                    }
+                } else {
+                    if (status != IS_FOREGROUND) {
+                        status = IS_UNDEFINED;
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+    if (status == IS_BACKGROUND) {
+        color = vec3(1.0f, 0.0f, 0.0f);
+    } else if (status == IS_FOREGROUND) {
+        color = vec3(0.0f, 1.0f, 0.0f);
+    } else {
+        color = vec3(0.0f, 0.0f, 1.0f);
+    }
+}

opengl-test-two/trimap.vertexshader

@@ -9,7 +9,7 @@ out vec2 UV;
 
 void main(){
     // Output position of the vertex, in clip space : MVP * position
-    gl_Position = vec4(vertexPosition_modelspace,1);
+    gl_Position = vec4(vertexPosition_modelspace, 1);
 
     // UV of the vertex. No special space for this one.
     UV = vertexUV;