1 files changed, 85 insertions, 0 deletions
diff --git a/src/OpenGLSupport.cpp b/src/OpenGLSupport.cpp
index c22fd1c..81a008b 100644
--- a/src/OpenGLSupport.cpp
+++ b/src/OpenGLSupport.cpp
@@ -28,3 +28,88 @@ bool OpenGL_Init()
 
     return true;
 }
+
+bool OpenGL_BuildShaderProgram(const char* vs, const char* fs, GLuint* ids, const char* name)
+{
+    int len;
+    int res;
+
+    ids[0] = glCreateShader(GL_VERTEX_SHADER);
+    len = strlen(vs);
+    glShaderSource(ids[0], 1, &vs, &len);
+    glCompileShader(ids[0]);
+
+    glGetShaderiv(ids[0], GL_COMPILE_STATUS, &res);
+    if (res != GL_TRUE)
+    {
+        glGetShaderiv(ids[0], GL_INFO_LOG_LENGTH, &res);
+        if (res < 1) res = 1024;
+        char* log = new char[res+1];
+        glGetShaderInfoLog(ids[0], res+1, NULL, log);
+        printf("OpenGL: failed to compile vertex shader %s: %s\n", name, log);
+        printf("shader source:\n--\n%s\n--\n", vs);
+        delete[] log;
+
+        glDeleteShader(ids[0]);
+
+        return false;
+    }
+
+    ids[1] = glCreateShader(GL_FRAGMENT_SHADER);
+    len = strlen(fs);
+    glShaderSource(ids[1], 1, &fs, &len);
+    glCompileShader(ids[1]);
+
+    glGetShaderiv(ids[1], GL_COMPILE_STATUS, &res);
+    if (res != GL_TRUE)
+    {
+        glGetShaderiv(ids[1], GL_INFO_LOG_LENGTH, &res);
+        if (res < 1) res = 1024;
+        char* log = new char[res+1];
+        glGetShaderInfoLog(ids[1], res+1, NULL, log);
+        printf("OpenGL: failed to compile fragment shader %s: %s\n", name, log);
+        //printf("shader source:\n--\n%s\n--\n", fs);
+        delete[] log;
+
+        glDeleteShader(ids[0]);
+        glDeleteShader(ids[1]);
+
+        return false;
+    }
+
+    ids[2] = glCreateProgram();
+    glAttachShader(ids[2], ids[0]);
+    glAttachShader(ids[2], ids[1]);
+    glLinkProgram(ids[2]);
+
+    glGetProgramiv(ids[2], GL_LINK_STATUS, &res);
+    if (res != GL_TRUE)
+    {
+        glGetProgramiv(ids[2], GL_INFO_LOG_LENGTH, &res);
+        if (res < 1) res = 1024;
+        char* log = new char[res+1];
+        glGetProgramInfoLog(ids[2], res+1, NULL, log);
+        printf("OpenGL: failed to link program %s: %s\n", name, log);
+        delete[] log;
+
+        glDeleteShader(ids[0]);
+        glDeleteShader(ids[1]);
+        glDeleteProgram(ids[2]);
+
+        return false;
+    }
+
+    return true;
+}
+
+void OpenGL_DeleteShaderProgram(GLuint* ids)
+{
+    glDeleteShader(ids[0]);
+    glDeleteShader(ids[1]);
+    glDeleteProgram(ids[2]);
+}
+
+void OpenGL_UseShaderProgram(GLuint* ids)
+{
+    glUseProgram(ids[2]);
+}