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--- fw:ogl:ogl4 [2013/03/04 22:17]
alfred [Entorno]
+++ fw:ogl:ogl4 [2020/05/09 09:25] (actual)
@@ Línea 5: / Línea 5: @@
 <code cpp>
 #define GL_GLEXT_PROTOTYPES 1
-# include  <GL/gl.h>
+#include  <GL/gl.h>
-# include  <GL/glext.h>
+#include  <GL/glext.h>
 </code>
-===== Shaders =====
+===== Almacenaje de datos =====
+==== Arrays ====
+=== Arrays indexados ===
+==== Buffers ====
+===== Shaders =====
+==== Creación de un programa de shaders ====
+<code cpp>
+GLuint LoadShaders(const char * vertex_file_path,const char * fragment_file_path){
+     // Create the shaders
+    GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
+    GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
+    // Read the Vertex Shader code from the file
+    std::string VertexShaderCode;
+    std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
+    if(VertexShaderStream.is_open())
+    {
+        std::string Line = "";
+        while(getline(VertexShaderStream, Line))
+            VertexShaderCode += "\n" + Line;
+        VertexShaderStream.close();
+    }
+    // Read the Fragment Shader code from the file
+    std::string FragmentShaderCode;
+    std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
+    if(FragmentShaderStream.is_open()){
+        std::string Line = "";
+        while(getline(FragmentShaderStream, Line))
+            FragmentShaderCode += "\n" + Line;
+        FragmentShaderStream.close();
+    }
+    GLint Result = GL_FALSE;
+    int InfoLogLength;
+    // Compile Vertex Shader
+    printf("Compiling shader : %s\n", vertex_file_path);
+    char const * VertexSourcePointer = VertexShaderCode.c_str();
+    glShaderSource(VertexShaderID, 1, &VertexSourcePointer , NULL);
+    glCompileShader(VertexShaderID);
+    // Check Vertex Shader
+    glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
+    glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+    std::vector<char> VertexShaderErrorMessage(InfoLogLength);
+    glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
+    fprintf(stdout, "%s\n", &VertexShaderErrorMessage[0]);
+    // Compile Fragment Shader
+    printf("Compiling shader : %s\n", fragment_file_path);
+    char const * FragmentSourcePointer = FragmentShaderCode.c_str();
+    glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , NULL);
+    glCompileShader(FragmentShaderID);
+    // Check Fragment Shader
+    glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
+    glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+    std::vector<char> FragmentShaderErrorMessage(InfoLogLength);
+    glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
+    fprintf(stdout, "%s\n", &FragmentShaderErrorMessage[0]);
+    // Link the program
+    fprintf(stdout, "Linking program\n");
+    GLuint ProgramID = glCreateProgram();
+    glAttachShader(ProgramID, VertexShaderID);
+    glAttachShader(ProgramID, FragmentShaderID);
+    glLinkProgram(ProgramID);
+    // Check the program
+    glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
+    glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+    std::vector<char> ProgramErrorMessage( max(InfoLogLength, int(1)) );
+    glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
+    fprintf(stdout, "%s\n", &ProgramErrorMessage[0]);
+    glDeleteShader(VertexShaderID);
+    glDeleteShader(FragmentShaderID);
+    return ProgramID;
+}
+</code>

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