shocobenn

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About shocobenn

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  1. I would like some advices

    Hi ! After a little work with Boost.asio here is what I can say about starting with it :   If you want to learn and practice low level networking :   You should use boost, which allow you to do basic networking stuff without care about the threads stuff. The tutorials and samples are really good to start and you'll be able to understand faster other libraries.   If you don't want to learn low level networking (You need to decode the header... the body...) and want to quickly setup your network :   Use raknet. You can find it on github here, and if you're an indie and your budget is less than 100K, raknet will stay free for you. You will be able to quickly make a chat with the RPC functions (that's magical !).
  2. I would like some advices

    Thank you :) Then, I think  i'll use Boost.asio because I can easily find tutorials for this one.   Ice looks weird with its string commands... And POCO slides are not really helpfull to start... If someone know which slide will teach me how to setup a stream / datagram connection, please say which one, I only see HTTP requests.
  3. Hi ! Like a lot of people here i'm working on a game and I would like to add it a multiplayer part .   I looked the populars C++ libraries (Raknet, Ice, POCO) and the only one who is attracting me is eNet, because the 3 others have a lot of features that I don't want to use / I don't understand.   But I think that i'm going to make my own winsock server, so i'm going to ask some questions to see if I won't have to reinvent the wheel by doing this.   What kinds of things should I add to a basic winsock server to have a minimum of security / efficiency? Is it really usefull to have such complete libraries like Ice, POCO and raknet for a game ? Is eNet already effective for a game or will I have to add security / packet management things ? Thanks for your help.
  4. Problems with TransfromFeedback

    Hi ! I have tried to resolve my example by using a double buffer and double vao but nothing changed.   Then I copied you example but this is still not working.   BUT i have noticed something : I created a blank project where I only initialize Glew and I get back GL_INVALID_ENUM by using glewInit(). So I looked on the net and found gl3w which resolve those problems. I tried to run with python 2.6 the gl3w_gen.py but I get a 404 not found for the file which he is looking for on opengl.org.   Here is the "copied file" using freeglut && glew #include <stdlib.h> #include <stdio.h> #include <iostream> #include <GL\glew.h> #include <GL\freeglut.h> #include <glm.hpp> #include <gtc\matrix_transform.hpp> #include <gtc\type_ptr.hpp> #include <time.h> #include <vector> #include <LoadShaders.h> #define GLExitIfError()                                                         \ {                                                                               \     GLenum Error = glGetError();                                                \     switch(Error)                                                                \     {                                                                            \         case GL_NO_ERROR :                                                        \             printf( "%s\n", "NO ERROR"    );                                                                \         break;                                                                    \         case GL_INVALID_ENUM :                                                  \             printf( "%s\n", "GL_INVALID_ENUM" ); \         break; \         case GL_INVALID_VALUE : \             printf("%s\n", "GL_INVALID_VALUE"); \         break;\         case GL_INVALID_OPERATION : \             printf("%s\n", "GL_INVALID_OPERATION"); \         break; \         case GL_INVALID_FRAMEBUFFER_OPERATION : \             printf("%s\n", "GL_INVALID_FRAMEBUFFER_OPERATION"); \         break; \         case GL_OUT_OF_MEMORY : \             printf("%s\n", "GL_OUT_OF_MEMORY"); \         break; \         default :\             printf("%s\n", "Unknow");\         break;\     } \ } bool check_shader_compile_status(GLuint obj) {     GLint status;     glGetShaderiv(obj, GL_COMPILE_STATUS, &status);     if(status == GL_FALSE)     {         GLint length;         glGetShaderiv(obj, GL_INFO_LOG_LENGTH, &length);         std::vector<char> log(length);         glGetShaderInfoLog(obj, length, &length, &log[0]);         std::cerr << &log[0];         return false;     }     return true; } bool check_program_link_status(GLuint obj) {     GLint status;     glGetProgramiv(obj, GL_LINK_STATUS, &status);     if(status == GL_FALSE)     {         GLint length;         glGetProgramiv(obj, GL_INFO_LOG_LENGTH, &length);         std::vector<char> log(length);         glGetProgramInfoLog(obj, length, &length, &log[0]);         std::cerr << &log[0];         return false;     }     return true; }   // the vertex shader simply passes through data std::string vertex_source =     "#version 330\n"     "layout(location = 0) in vec4 vposition;\n"     "void main() {\n"     " gl_Position = vposition;\n"     "}\n";      // the geometry shader creates the billboard quads std::string geometry_source =     "#version 330\n"     "uniform mat4 View;\n"     "uniform mat4 Projection;\n"     "layout (points) in;\n"     "layout (triangle_strip, max_vertices = 4) out;\n"     "out vec2 txcoord;\n"     "void main() {\n"     " vec4 pos = View*gl_in[0].gl_Position;\n"     " txcoord = vec2(-1,-1);\n"     " gl_Position = Projection*(pos+0.2*vec4(txcoord,0,0));\n"     " EmitVertex();\n"     " txcoord = vec2( 1,-1);\n"     " gl_Position = Projection*(pos+0.2*vec4(txcoord,0,0));\n"     " EmitVertex();\n"     " txcoord = vec2(-1, 1);\n"     " gl_Position = Projection*(pos+0.2*vec4(txcoord,0,0));\n"     " EmitVertex();\n"     " txcoord = vec2( 1, 1);\n"     " gl_Position = Projection*(pos+0.2*vec4(txcoord,0,0));\n"     " EmitVertex();\n"     "}\n";      // the fragment shader creates a bell like radial color distribution std::string fragment_source =     "#version 330\n"     "in vec2 txcoord;\n"     "layout(location = 0) out vec4 FragColor;\n"     "void main() {\n"     " \n"     " FragColor = vec4(1.0,0.0,0.0,1);\n"     "}\n"; GLuint render_program; GLint View_location; GLint Projection_location; void createRenderProgram() {     GLuint vertex_shader, geometry_shader, fragment_shader;     const char *source;     int length;     // create and compiler vertex shader     vertex_shader = glCreateShader(GL_VERTEX_SHADER);     source = vertex_source.c_str();     length = vertex_source.size();     glShaderSource(vertex_shader, 1, &source, &length);     glCompileShader(vertex_shader);     if(!check_shader_compile_status(vertex_shader))     {         return;     }          // create and compiler geometry shader     geometry_shader = glCreateShader(GL_GEOMETRY_SHADER);     source = geometry_source.c_str();     length = geometry_source.size();     glShaderSource(geometry_shader, 1, &source, &length);     glCompileShader(geometry_shader);     if(!check_shader_compile_status(geometry_shader))     {         return;     }       // create and compiler fragment shader     fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);     source = fragment_source.c_str();     length = fragment_source.size();     glShaderSource(fragment_shader, 1, &source, &length);     glCompileShader(fragment_shader);     if(!check_shader_compile_status(fragment_shader))     {         return;     }     // create program     render_program = glCreateProgram();          // attach shaders     glAttachShader(render_program, vertex_shader);     glAttachShader(render_program, geometry_shader);     glAttachShader(render_program, fragment_shader);          // link the program and check for errors     glLinkProgram(render_program);     check_program_link_status(render_program);          View_location = glGetUniformLocation(render_program, "View");     Projection_location = glGetUniformLocation(render_program, "Projection"); }  // the transform feedback shader only has a vertex shader std::string transform_vertex_source =     "#version 330\n"     "uniform vec3 center[3];\n"     "uniform float radius[3];\n"     "uniform vec3 g;\n"     "uniform float dt;\n"     "uniform float bounce;\n"     "uniform int seed;\n"     "layout(location = 0) in vec3 inposition;\n"     "layout(location = 1) in vec3 invelocity;\n"     "out vec3 outposition;\n"     "out vec3 outvelocity;\n"              "float hash(int x) {\n"     " x = x*1235167 + gl_VertexID*948737 + seed*9284365;\n"     " x = (x >> 13) ^ x;\n"     " return ((x * (x * x * 60493 + 19990303) + 1376312589) & 0x7fffffff)/float(0x7fffffff-1);\n"     "}\n"              "void main() {\n"     " outvelocity = invelocity;\n"     " for(int j = 0;j<3;++j) {\n"     " vec3 diff = inposition-center[j];\n"     " float dist = length(diff);\n"     " float vdot = dot(diff, invelocity);\n"     " if(dist<radius[j] && vdot<0.0)\n"     " outvelocity -= bounce*diff*vdot/(dist*dist);\n"     " }\n"     " outvelocity += dt*g;\n"     " outposition = inposition + dt*outvelocity;\n"     " if(outposition.y < -30.0)\n"     " {\n"     " outvelocity = vec3(0,0,0);\n"     " outposition = 0.5-vec3(hash(3*gl_VertexID+0),hash(3*gl_VertexID+1),hash(3*gl_VertexID+2));\n"     " outposition = vec3(0,20,0) + 5.0*outposition;\n"     " }\n"     "}\n"; GLuint transform_shader_program; GLint center_location; GLint radius_location; GLint g_location; GLint dt_location; GLint bounce_location ; GLint seed_location; void createUpdateProgram() {     GLuint transform_vertex_shader;          const char *source;     int length;     transform_vertex_shader = glCreateShader(GL_VERTEX_SHADER);     source = transform_vertex_source.c_str();     length = transform_vertex_source.size();     glShaderSource(transform_vertex_shader, 1, &source, &length);     glCompileShader(transform_vertex_shader);     if(!check_shader_compile_status(transform_vertex_shader))     {         return;     }      // create program     transform_shader_program = glCreateProgram();          // attach shaders     glAttachShader(transform_shader_program, transform_vertex_shader);          // specify transform feedback output     const char *varyings[] = {"outposition", "outvelocity"};     glTransformFeedbackVaryings(transform_shader_program, 2, varyings, GL_INTERLEAVED_ATTRIBS);          // link the program and check for errors     glLinkProgram(transform_shader_program);     check_program_link_status(transform_shader_program);     center_location = glGetUniformLocation(transform_shader_program, "center");     radius_location = glGetUniformLocation(transform_shader_program, "radius");     g_location = glGetUniformLocation(transform_shader_program, "g");     dt_location = glGetUniformLocation(transform_shader_program, "dt");     bounce_location = glGetUniformLocation(transform_shader_program, "bounce");     seed_location = glGetUniformLocation(transform_shader_program, "seed"); } const int buffercount = 2; const int particles = 128*1024; std::vector<glm::vec3> vertexData(2*particles); GLuint vao[buffercount], vbo[buffercount]; const int spheres = 3; glm::vec3 center[spheres]; float radius[spheres]; // physical parameters float dt = 1.0f/60.0f; glm::vec3 g(0.0f, -9.81f, 0.0f); float bounce = 1.2f; // inelastic: 1.0f, elastic: 2.0f int current_buffer=0; void init() {          createRenderProgram();              createUpdateProgram();     for(int i = 0;i<particles;++i)     {         // initial position         vertexData[2*i+0] = glm::vec3(                                 0.5f-float(std::rand())/RAND_MAX,                                 0.5f-float(std::rand())/RAND_MAX,                                 0.5f-float(std::rand())/RAND_MAX                             );         vertexData[2*i+0] = glm::vec3(0.0f,20.0f,0.0f) + 5.0f*vertexData[2*i+0];                  // initial velocity         vertexData[2*i+1] = glm::vec3(0,0,0);     }     for(int i = 0;i<buffercount;++i)     {         glBindVertexArray(vao[i]);                  glBindBuffer(GL_ARRAY_BUFFER, vbo[i]);         // fill with initial data         glBufferData(GL_ARRAY_BUFFER, sizeof(glm::vec3)*vertexData.size(), &vertexData[0], GL_STATIC_DRAW);                                  // set up generic attrib pointers         glEnableVertexAttribArray(0);         glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6*sizeof(GLfloat), (char*)0 + 0*sizeof(GLfloat));         // set up generic attrib pointers         glEnableVertexAttribArray(1);         glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6*sizeof(GLfloat), (char*)0 + 3*sizeof(GLfloat));     }      // "unbind" vao     glBindVertexArray(0);          glEnable(GL_BLEND);     // and set the blend function to result = 1*source + 1*destination     glBlendFunc(GL_ONE, GL_ONE);     center[0] = glm::vec3(0,12,1);     radius[0] = 3;     center[1] = glm::vec3(-3,0,0);     radius[1] = 7;     center[2] = glm::vec3(5,-10,0);     radius[2] = 12; } void display() {     long t = time(NULL);     glUseProgram(transform_shader_program);     // set the uniforms         glUniform3fv(center_location, 3, reinterpret_cast<GLfloat*>(center));         glUniform1fv(radius_location, 3, reinterpret_cast<GLfloat*>(radius));         glUniform3fv(g_location, 1, glm::value_ptr(g));         glUniform1f(dt_location, dt);         glUniform1f(bounce_location, bounce);         glUniform1i(seed_location, std::rand());         // bind the current vao         glBindVertexArray(vao[(current_buffer+1)%buffercount]);         // bind transform feedback target         glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, vbo[current_buffer]);         glEnable(GL_RASTERIZER_DISCARD);         // perform transform feedback         glBeginTransformFeedback(GL_POINTS);         glDrawArrays(GL_POINTS, 0, particles);         glEndTransformFeedback();         glDisable(GL_RASTERIZER_DISCARD);             // clear first         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);                  // use the shader program         glUseProgram(render_program);                  // calculate ViewProjection matrix         glm::mat4 Projection = glm::perspective(90.0f, 4.0f / 3.0f, 0.1f, 100.f);                  // translate the world/view position         glm::mat4 View = glm::translate(glm::mat4(1.0f), glm::vec3(0.0f, 0.0f, -30.0f));                  // make the camera rotate around the origin         View = glm::rotate(View, 30.0f, glm::vec3(1.0f, 0.0f, 0.0f));         View = glm::rotate(View, -22.5f, glm::vec3(0.0f, 1.0f, 0.0f));                  // set the uniform         glUniformMatrix4fv(View_location, 1, GL_FALSE, glm::value_ptr(View));         glUniformMatrix4fv(Projection_location, 1, GL_FALSE, glm::value_ptr(Projection));                  // bind the current vao         glBindVertexArray(vao[current_buffer]);         // draw         glDrawArrays(GL_POINTS, 0, particles);                 // check for errors              // finally swap buffers         glutSwapBuffers();                  // advance buffer index         current_buffer = (current_buffer + 1) % buffercount; } void Reshape(int width, int height) {     glViewport(0, 0 , width, height); } int main(int argc, char **argv) {     glutInit(&argc, argv);     glutInitContextFlags(GLUT_DEBUG);     glutInitWindowSize(1024, 768);     glutInitContextVersion(3, 3);     glutInitWindowPosition (140, 140);     glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);     glutInitContextProfile(GLUT_CORE_PROFILE);     glutCreateWindow("hello");     glewExperimental = true;     if (glewInit() != GLEW_OK)     {         std::cout << "Une erreur est survenue lors de l'init de glew" << std::endl;         exit(EXIT_FAILURE);     }     GLExitIfError();          init();     glutDisplayFunc(display);     glutReshapeFunc(Reshape);     glutMainLoop();     glDeleteVertexArrays(buffercount, vao);     glDeleteBuffers(buffercount, vbo);          return 0; } Maybe someone could help me for debugging ? Because of glew GL_INVALID_ENUM I can't place a glGetError where I want . Is someone having the same probleme with gl3w? (I 'm on window8).
  5. Hi ! I'm not sure to really get transform feedback usage. They are used to modify a VBO from the GPU, so you can create particulesSystems which move without the CPU, isn't it?   So I tried to make a simple soft where I draw a point and I want to move it on his X axis. But It doesn't... i don't see why...   Here is the code   Instance.vert #version 400 layout (location = 0) in vec4 position; out vec4 vPosition; void main(void) { position.x += 0.5; vPosition = position; } Main.cpp #include <stdlib.h> #include <stdio.h> #include <iostream> #include <GL\glew.h> #include <GL\freeglut.h> #include <LoadShaders.h> GLuint render_prog; GLuint inputVBO; GLuint outputVBO; GLuint transformFeedbackObj; GLint render_model_matrix_loc; GLint render_projection_matrix_loc; // A single triangle static const GLfloat vertex_positions[] = { 0, 0, 0.0f, 1.0f, }; void createShader() { render_prog = glCreateProgram(); GLuint vsHandle = glCreateShader(GL_VERTEX_SHADER); const GLchar* source = ReadShader("instance.vert"); glShaderSource(vsHandle, 1, &source, 0); glCompileShader(vsHandle); glAttachShader(render_prog, vsHandle); const char* varyings[1] = { "vPosition"}; glTransformFeedbackVaryings(render_prog, 1, varyings, GL_INTERLEAVED_ATTRIBS); glLinkProgram(render_prog); } void init() { createShader(); glGenBuffers(1, &inputVBO); glGenBuffers(1, &outputVBO); glBindBuffer(GL_ARRAY_BUFFER, outputVBO); glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_positions) , (vertex_positions), GL_STATIC_DRAW); glBindBuffer(GL_ARRAY_BUFFER, 0); glGenTransformFeedbacks(1, &transformFeedbackObj); glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, transformFeedbackObj); glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, outputVBO); //So , as I understand outputVBO will be modified by the transfromFeedback using inputVBO glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, 0); glClearColor(0.0f, 0.1f, 0.0f, 1.0f); } void moveThePoint() { glEnable(GL_RASTERIZER_DISCARD); glUseProgram(render_prog); glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, transformFeedbackObj); glBeginTransformFeedback(GL_POINTS); //begin the transfromFeedback glBindBuffer(GL_ARRAY_BUFFER, inputVBO); //draw into it glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_positions), vertex_positions, GL_STREAM_DRAW); glEnableVertexAttribArray(0); glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, (const GLvoid *) 0); glDrawArrays(GL_POINTS,0, 1); glDisableVertexAttribArray(0); //clean glBindBuffer(GL_ARRAY_BUFFER, 0); glEndTransformFeedback(); glDisable(GL_RASTERIZER_DISCARD); glUseProgram(0); } void drawThePoint() { glBindBuffer(GL_ARRAY_BUFFER, outputVBO); glEnableClientState(GL_VERTEX_ARRAY); glVertexPointer(4, GL_FLOAT, 0, 0); glDrawTransformFeedback(GL_POINTS, transformFeedbackObj); glDisableClientState(GL_VERTEX_ARRAY); glBindBuffer(GL_ARRAY_BUFFER, 0); } void display() // Loop { // Setup glPointSize(21.0); glDisable(GL_DEPTH_TEST); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); moveThePoint(); drawThePoint(); glutSwapBuffers(); } void Reshape(int width, int height) { glViewport(0, 0 , width, height); } int main(int argc, char **argv) { glutInit(&argc, argv); glutInitContextFlags(GLUT_DEBUG); glutInitWindowSize(1024, 768); glutInitContextVersion(4, 0); glutInitWindowPosition (140, 140); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); glutInitContextProfile(GLUT_CORE_PROFILE); glutCreateWindow("hello"); if (glewInit()) { std::cout << "Une erreur est survenue lors de l'init de glew" << std::endl; exit(EXIT_FAILURE); } init(); glutDisplayFunc(display); glutReshapeFunc(Reshape); glutMainLoop(); glDeleteBuffers(1, &inputVBO); glDeleteBuffers(1, &outputVBO); glDeleteTransformFeedbacks(1, &transformFeedbackObj); return 0; }
  6. OpenGL Texture loading with devIL

    Thank you guys, used SOIL and resolved the problem :)
  7. Hello !       I tried to use devIL to import textures into OpenGL, my soft pass all the tests durring the loading of the devIL image and I get a "texture successfully loaded" BUT the result after building is that the texture is empty in the fragment shader (so I get a black rectangle)   So, to be sure that the problem is totally about the devIL loading, i tried with a DDS loader, and that worked.   My texture is 128 x 128 and 24 depth   Here is my code :     Vertex Shader : #version 400 uniform mat4 model_matrix; uniform mat4 projection_matrix; layout (location = 0) in vec4 position; layout (location = 1) in vec2 instance_uv; out vec2 UV; void main(void) { UV = instance_uv; gl_Position = position; } Fragment Shader : #version 400 core // Interpolated values from the vertex shaders in vec2 UV; // Ouput data out vec4 color; // Values that stay constant for the whole mesh. uniform sampler2D myTextureSampler; void main(){     // Output color = color of the texture at the specified UV     color = texture( myTextureSampler, UV.xy ).rgba;      } main.cpp #include <stdlib.h> #include <stdio.h> #include <iostream> #include <GL\glew.h> #include <GL\freeglut.h> #include <vgl.h> #include <LoadShaders.h> #include <IL\il.h> #include <IL\ilut.h> #include <IL\ilu.h> #include "texture.hpp" #define INSTANCE_COUNT 200 float aspect; GLuint render_prog; GLuint vao[1]; GLuint vbo[1]; GLuint ebo[1]; GLint render_model_matrix_loc; GLint render_projection_matrix_loc; ILuint images[2]; GLuint texture; GLuint TextureLoc; GLuint loadImage(const char* theFileName)// devIL loader { ILuint imageID; // Create an image ID as a ULuint GLuint textureID; // Create a texture ID as a GLuint ILboolean success; // Create a flag to keep track of success/failure ILenum error; // Create a flag to keep track of the IL error state ilGenImages(1, &imageID); // Generate the image ID ilBindImage(imageID); // Bind the image success = ilLoadImage(theFileName); // Load the image file // If we managed to load the image, then we can start to do things with it... if (success) { // If the image is flipped (i.e. upside-down and mirrored, flip it the right way up!) ILinfo ImageInfo; iluGetImageInfo(&ImageInfo); if (ImageInfo.Origin == IL_ORIGIN_UPPER_LEFT) { iluFlipImage(); } // Convert the image into a suitable format to work with // NOTE: If your image contains alpha channel you can replace IL_RGB with IL_RGBA success = ilConvertImage(IL_RGB, IL_UNSIGNED_BYTE); // Quit out if we failed the conversion if (!success) { error = ilGetError(); std::cout << "Image conversion failed - IL reports error: " << error << " - " << iluErrorString(error) << std::endl; exit(-1); } // Generate a new texture glGenTextures(1, &textureID); // Bind the texture to a name glBindTexture(GL_TEXTURE_2D, textureID); // Set texture clamping method glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); // Set texture interpolation method to use linear interpolation (no MIPMAPS) glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); // Specify the texture specification glTexImage2D(GL_TEXTURE_2D, // Type of texture 0, // Pyramid level (for mip-mapping) - 0 is the top level ilGetInteger(IL_IMAGE_BPP), // Image colour depth ilGetInteger(IL_IMAGE_WIDTH), // Image width ilGetInteger(IL_IMAGE_HEIGHT), // Image height 0, // Border width in pixels (can either be 1 or 0) ilGetInteger(IL_IMAGE_FORMAT), // Image format (i.e. RGB, RGBA, BGR etc.) GL_UNSIGNED_BYTE, // Image data type ilGetData()); // The actual image data itself } else // If we failed to open the image file in the first place... { error = ilGetError(); std::cout << "Image load failed - IL reports error: " << error << " - " << iluErrorString(error) << std::endl; exit(-1); } ilDeleteImages(1, &imageID); // Because we have already copied image data into texture data we can release memory used by image. std::cout << "Texture creation successful." << std::endl; return textureID; // Return the GLuint to the texture so you can use it! } void init() { glEnable(GL_TEXTURE_2D); ShaderInfo shader_info[] = { { GL_VERTEX_SHADER, "instance.vert" }, { GL_FRAGMENT_SHADER, "instance.frag" }, { GL_NONE, NULL } }; render_prog = LoadShaders(shader_info); render_model_matrix_loc = glGetUniformLocation(render_prog, "model_matrix"); render_projection_matrix_loc = glGetUniformLocation(render_prog, "projection_matrix"); // A single triangle static const GLfloat vertex_positions[] = { -0.5f, -0.5f, 0.0f, 1.0f, 0.5f, -0.5f, 0.0f, 1.0f, 0.5f, 0.5f, 0.0f, 1.0f, -0.5f, 0.5f, 0.0f, 1.0f }; static const GLfloat vertex_uv[] = { 0.0, 1.0, 1.0, 1.0, 1.0, 0.0, 0.0, 0.0 }; // Indices for the triangle strips static const GLushort vertex_indices[] = { 0, 1, 2, 3 }; glGenVertexArrays(1, vao); glBindVertexArray(vao[0]); glGenBuffers(1, vbo); glBindBuffer(GL_ARRAY_BUFFER, vbo[0]); glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_positions) + sizeof(vertex_uv) , NULL, GL_STATIC_DRAW); glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertex_positions), vertex_positions); glBufferSubData(GL_ARRAY_BUFFER, sizeof(vertex_positions), sizeof(vertex_uv), vertex_uv); glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, (const GLvoid*) 0); glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, (const GLvoid*) sizeof(vertex_positions)); //texture = loadDDS("uvtemplate.DDS"); works texture = loadImage("test.jpg"); // doesn't work TextureLoc = glGetUniformLocation(render_prog, "myTextureSampler"); glClearColor(1.0f, 0.0f, 0.0f, 1.0f); } void display() { // Setup glPointSize(21.0); glDisable(GL_DEPTH_TEST); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glUseProgram(render_prog); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, texture); // Set our "myTextureSampler" sampler to user Texture Unit 0 glUniform1i(TextureLoc, 0); glEnableVertexAttribArray(0); glEnableVertexAttribArray(1); glDrawArrays(GL_TRIANGLE_FAN, 0, 4); glDisableVertexAttribArray(0); glDisableVertexAttribArray(1); glutSwapBuffers(); } void Reshape(int width, int height) { glViewport(0, 0 , width, height); aspect = float(height) / float(width); } int main(int argc, char **argv) { glutInit(&argc, argv); glutInitContextFlags(GLUT_DEBUG); glutInitWindowSize(1024, 768); glutInitContextVersion(4, 0); glutInitWindowPosition (140, 140); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); glutInitContextProfile(GLUT_CORE_PROFILE); glutCreateWindow("hello"); if (glewInit()) { std::cout << "Une erreur est survenue lors de l'init de glew" << std::endl; exit(EXIT_FAILURE); } ilInit(); iluInit(); ilutInit(); ilutRenderer(ILUT_OPENGL); init(); glutDisplayFunc(display); glutReshapeFunc(Reshape); glutMainLoop(); glDeleteVertexArrays(1, vao);       glDeleteBuffers(1, vbo);      glDeleteTextures(1, &texture); return 0; } Thank you for your help !
  8. Smoothing the movement of a dragged object

    For this kind of problem i like to use Lerp, which is easy to implement. When the points are very close, this is verry slow, and when you'll drag it you'll have a little smooth. Vector2 position = new Vector2(100,100); Vector2 destination = new Vector2(101,101); position = Vector2.Lerp(position, destination, 0.8); http://keithmaggio.wordpress.com/2011/02/15/math-magician-lerp-slerp-and-nlerp/
  9.   For this solution Is it more easy to do it by making a server from scratch or use a lib (if you know free ones which are usefull for it)?
  10. OpenGL Instancing Demystified

    I learned about the instancing in opengl and knew that that was really usefull. But now I also know that it increases performances ! Thanks !