Re: D, Derelict2, and OpenGL
Am 20.04.2012 00:34, schrieb Stephen Jones:
In the same vein, I have getting nothing on the screen when there should
be rendered a red triangle. The vertex positions are those used by
McKeeson http://www.arcsynthesis.org/gltut/, being in ndc fall within
the frustum. The code for setting up vao and shaders is:
module ShaderHub;
import std.stdio;
import std.string;
import derelict.opengl3.gl3;
class ShaderHub{
private bool ok=true;
private GLuint shad=0, vshad=0, fshad=0;
private int voff=0;
private GLuint vbo=0, vao=0;
const float[] v = [ 0.75f, 0.75f, 0.0f, 1.0f,
0.75f, -0.75f, 0.0f, 1.0f,
-0.75f, -0.75f, 0.0f, 1.0f];
public this(){
immutable string vshader = `
#version 330
layout(location = 1) in vec4 pos;
void main(void)
{
gl_Position = pos;
}
`;
immutable string fshader = `
#version 330
void main(void)
{
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
`;
shad=glCreateProgram();
if(shad==0){
writeln("Error: GL did not assigh main shader program id");
ok=false;
}
vshad=glCreateShader(GL_VERTEX_SHADER);
const char *vptr=toStringz(vshader);
glShaderSource(vshad, 1, &vptr, null);
glCompileShader(vshad);
int status, len;
glGetShaderiv(vshad, GL_COMPILE_STATUS, &status);
if(status==GL_FALSE){
glGetShaderiv(vshad, GL_INFO_LOG_LENGTH, &len);
char[] error=new char[len];
glGetShaderInfoLog(vshad, len, null, cast(char*)error);
writeln(error);
ok=false;
}
fshad=glCreateShader(GL_FRAGMENT_SHADER);
const char *fptr=toStringz(fshader);
glShaderSource(fshad, 1, &fptr, null);
glCompileShader(fshad);
glGetShaderiv(vshad, GL_COMPILE_STATUS, &status);
if(status==GL_FALSE){
glGetShaderiv(fshad, GL_INFO_LOG_LENGTH, &len);
char[] error=new char[len];
glGetShaderInfoLog(fshad, len, null, cast(char*)error);
writeln(error);
ok=false;
}
glAttachShader(shad, vshad);
glAttachShader(shad, fshad);
glLinkProgram(shad);
glGetShaderiv(shad, GL_LINK_STATUS, &status);
if(status==GL_FALSE){
glGetShaderiv(shad, GL_INFO_LOG_LENGTH, &len);
char[] error=new char[len];
glGetShaderInfoLog(shad, len, null, cast(char*)error);
writeln(error);
ok=false;
}
glGenVertexArrays(1, &vao);
if(vao<1){
writeln("Error: GL failed to assign vao id");
ok=false;
}
glBindVertexArray(vao);
glGenBuffers(1, &vbo);
if(vbo<1){
writeln("Error: GL failed to assign vbo id");
ok=false;
}
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, v.length * GL_FLOAT.sizeof, &v[0],
GL_STATIC_DRAW);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, 0, cast(void*)voff);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
public void draw(){
glUseProgram(shad);
writeln(glGetAttribLocation(shad, "pos"));//prints 1
glBindVertexArray(vao);
glDrawArrays(GL_TRIANGLES, 0, 6);
glBindVertexArray(0);
glUseProgram(0);
}
}
//__
the code for setting up openGL3 is:
import std.stdio;
import derelict.sdl2.sdl;
import derelict.opengl3.gl3;
import EventHub;
import ExposeApp;
pragma(lib, "DerelictUtil.lib");
pragma(lib, "DerelictSDL2.lib");
pragma(lib, "DerelictGL3.lib");
class App{
private ExposeApp funcPtrs;
private EventHub ehub;
private SDL_Window *win;
private SDL_GLContext context;
private int w=600, h=480, fov=55;
private bool running=true;
public this(){
if(!initSDL()){
writeln("Error initializing SDL");
SDL_Quit();
}
initGL();
funcPtrs=new ExposeApp();
funcPtrs.stop=&stopLoop;
funcPtrs.grabMouse=&grabMouse;
funcPtrs.releaseMouse=&releaseMouse;
ehub=new EventHub(funcPtrs);
while(running){
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
ehub.tick();
SDL_GL_SwapWindow(win);
}
SDL_GL_DeleteContext(context);
SDL_DestroyWindow(win);
SDL_Quit();
}
private void stopLoop(){
running=false;
}
private void grabMouse(){
SDL_ShowCursor(SDL_DISABLE);
SDL_SetWindowGrab(win, SDL_TRUE);
}
private void releaseMouse(){
SDL_ShowCursor(SDL_ENABLE);
SDL_SetWindowGrab(win, SDL_FALSE);
}
private bool initSDL(){
if(SDL_Init(SDL_INIT_VIDEO)< 0){
writefln("Error initializing SDL");
SDL_Quit();
return false;
}
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
win=SDL_CreateWindow("3Doodle", SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED, w, h, SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN);
if(!win){
writefln("Error creating SDL window");
SDL_Quit();
return false;
}
context=SDL_GL_CreateContext(win);
SDL_GL_SetSwapInterval(1);
DerelictGL3.reload();
return true;
}
private void initGL(){
resize(w, h);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glDepthFunc(GL_LEQUAL);
glClearColor(0.0, 0.0, 0.0, 1.0);
glClearDepth(1.0);
glCullFace(GL_BACK);
glFrontFace(GL_CCW);
}
private void resize(int w, int h){
//this will contain the makings of the projection matrix, which we go
into next tut
glViewport(0, 0, w, h);
}
}
void main(){
try{
DerelictSDL2.load();
}catch(Exception e){
writeln("Error loading SDL2 lib");
}
try{
DerelictGL3.load();
Re: D, Derelict2, and OpenGL
In the same vein, I have getting nothing on the screen when there
should be rendered a red triangle. The vertex positions are those
used by McKeeson http://www.arcsynthesis.org/gltut/, being in ndc
fall within the frustum. The code for setting up vao and shaders
is:
module ShaderHub;
import std.stdio;
import std.string;
import derelict.opengl3.gl3;
class ShaderHub{
private bool ok=true;
private GLuint shad=0, vshad=0, fshad=0;
private int voff=0;
private GLuint vbo=0, vao=0;
const float[] v = [ 0.75f, 0.75f, 0.0f, 1.0f,
0.75f, -0.75f, 0.0f, 1.0f,
-0.75f, -0.75f, 0.0f, 1.0f];
public this(){
immutable string vshader = `
#version 330
layout(location = 1) in vec4 pos;
void main(void)
{
gl_Position = pos;
}
`;
immutable string fshader = `
#version 330
void main(void)
{
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
`;
shad=glCreateProgram();
if(shad==0){
writeln("Error: GL did not assigh main shader program
id");
ok=false;
}
vshad=glCreateShader(GL_VERTEX_SHADER);
const char *vptr=toStringz(vshader);
glShaderSource(vshad, 1, &vptr, null);
glCompileShader(vshad);
int status, len;
glGetShaderiv(vshad, GL_COMPILE_STATUS, &status);
if(status==GL_FALSE){
glGetShaderiv(vshad, GL_INFO_LOG_LENGTH, &len);
char[] error=new char[len];
glGetShaderInfoLog(vshad, len, null, cast(char*)error);
writeln(error);
ok=false;
}
fshad=glCreateShader(GL_FRAGMENT_SHADER);
const char *fptr=toStringz(fshader);
glShaderSource(fshad, 1, &fptr, null);
glCompileShader(fshad);
glGetShaderiv(vshad, GL_COMPILE_STATUS, &status);
if(status==GL_FALSE){
glGetShaderiv(fshad, GL_INFO_LOG_LENGTH, &len);
char[] error=new char[len];
glGetShaderInfoLog(fshad, len, null, cast(char*)error);
writeln(error);
ok=false;
}
glAttachShader(shad, vshad);
glAttachShader(shad, fshad);
glLinkProgram(shad);
glGetShaderiv(shad, GL_LINK_STATUS, &status);
if(status==GL_FALSE){
glGetShaderiv(shad, GL_INFO_LOG_LENGTH, &len);
char[] error=new char[len];
glGetShaderInfoLog(shad, len, null, cast(char*)error);
writeln(error);
ok=false;
}
glGenVertexArrays(1, &vao);
if(vao<1){
writeln("Error: GL failed to assign vao id");
ok=false;
}
glBindVertexArray(vao);
glGenBuffers(1, &vbo);
if(vbo<1){
writeln("Error: GL failed to assign vbo id");
ok=false;
}
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, v.length * GL_FLOAT.sizeof,
&v[0], GL_STATIC_DRAW);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, 0,
cast(void*)voff);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
public void draw(){
glUseProgram(shad);
writeln(glGetAttribLocation(shad, "pos"));//prints 1
glBindVertexArray(vao);
glDrawArrays(GL_TRIANGLES, 0, 6);
glBindVertexArray(0);
glUseProgram(0);
}
}
//__
the code for setting up openGL3 is:
import std.stdio;
import derelict.sdl2.sdl;
import derelict.opengl3.gl3;
import EventHub;
import ExposeApp;
pragma(lib, "DerelictUtil.lib");
pragma(lib, "DerelictSDL2.lib");
pragma(lib, "DerelictGL3.lib");
class App{
private ExposeApp funcPtrs;
private EventHub ehub;
private SDL_Window *win;
private SDL_GLContext context;
private int w=600, h=480, fov=55;
private bool running=true;
public this(){
if(!initSDL()){
writeln("Error initializing SDL");
SDL_Quit();
}
initGL();
funcPtrs=new ExposeApp();
f
Re: D, Derelict2, and OpenGL
On Friday, 24 February 2012 at 09:22:59 UTC, David wrote: Am 24.02.2012 01:50, schrieb Chris Pons: Is the documentation up-to-date on this site? So that I can search through and try to learn more about a certain library and how it could help me? Which site? The derelict documentation? There is no real derelict documentation, but you normally dont need it, the only thing you're doing with derelict is initializing and loading a shared library (glfw, sdl, opengl …). Ok, I guess I was not specific enough. I was asking about D documentation. Is it up-to-date?
Re: D, Derelict2, and OpenGL
Am 24.02.2012 01:50, schrieb Chris Pons: Is the documentation up-to-date on this site? So that I can search through and try to learn more about a certain library and how it could help me? Which site? The derelict documentation? There is no real derelict documentation, but you normally dont need it, the only thing you're doing with derelict is initializing and loading a shared library (glfw, sdl, opengl …).
Re: D, Derelict2, and OpenGL
On Thursday, 23 February 2012 at 19:26:31 UTC, James Miller wrote: I find that when learning a complicated system or library, the best way is to write out the code examples, compile them, then change things until they break, fix it, then make more changes. Eventually you end up with the worst code ever known to man and a thorough understanding of the system at hand. I did it recently when figuring out that there is more to terminal emulation than just IO redirection and interpreting Terminal codes. Most of the time, you'll bang your head against your desk screaming "why wont you work" until you brain-damage your way into an epiphany, fix everything, achieve enlightenment, ???, PROFIT! I have followed this same pattern when I work with the UDK. Although, with that, its more about searching through source code, reading over the foundation I'm building upon and moving from there to try to implement my classes. For me, that method has been the best to learn. Along with some frustration when it doesn't go as planned. Is the documentation up-to-date on this site? So that I can search through and try to learn more about a certain library and how it could help me?
Re: D, Derelict2, and OpenGL
I find that when learning a complicated system or library, the best way is to write out the code examples, compile them, then change things until they break, fix it, then make more changes. Eventually you end up with the worst code ever known to man and a thorough understanding of the system at hand. I did it recently when figuring out that there is more to terminal emulation than just IO redirection and interpreting Terminal codes. Most of the time, you'll bang your head against your desk screaming "why wont you work" until you brain-damage your way into an epiphany, fix everything, achieve enlightenment, ???, PROFIT!
Re: D, Derelict2, and OpenGL
Ok, well it must be something wrong on my end. I have tried logging in with no result. I'll try to work it. I don't know if you are mistaken or not, but looking at the member list sorted by join date, several new members have registered recently. So if approval *is* required, it probably isn't too long. Did you try to log in? At any, rate, I (Aldacron) have nothing to do with approval of members of the forums as a whole. All I can do is moderate posts specifically in the Derelict forum.
Re: D, Derelict2, and OpenGL
On 2/23/2012 10:29 AM, Chris Pons wrote: Ok, thanks for clearing that up. I am really looking forward to seeing what D and Derelict2 can offer. However, I would have liked to post this in the Derelict forums because it seems like the more appropriate place. I know that Aldacron is only one man, and I appreciate his hard work, but how long does it take to get approved to post on that forum? I read that I had to wait for moderator activation (unless I was mistaken) ? I don't know if you are mistaken or not, but looking at the member list sorted by join date, several new members have registered recently. So if approval *is* required, it probably isn't too long. Did you try to log in? At any, rate, I (Aldacron) have nothing to do with approval of members of the forums as a whole. All I can do is moderate posts specifically in the Derelict forum.
Re: D, Derelict2, and OpenGL
Ok, thanks for clearing that up. I am really looking forward to
seeing what D and Derelict2 can offer. However, I would have
liked to post this in the Derelict forums because it seems like
the more appropriate place.
I know that Aldacron is only one man, and I appreciate his hard
work, but how long does it take to get approved to post on that
forum?
I read that I had to wait for moderator activation (unless I was
mistaken) ?
On Thursday, 23 February 2012 at 01:15:17 UTC, David wrote:
Am 23.02.2012 01:20, schrieb Chris Pons:
Hey David and Vijay,
Thank you for the swift replies. It seems like this foray into
D and
OpenGL could be a bit overwhelming considering I would be
learning D and
SDL/OpenGL at the same time. So because of this, i'm going to
make sure
I have a solid base in D to start with.
I am an Intermediate level C++ programmer, and I have used
SDL/SFML/DirectX so the majority so far in the D programming
book is
very familiar.
I however, do have a newbie Derelict2/OpenGL question. I have
a basic
program that simply spawns a window using SDL which I found
from one of
the SDL/OpenGL tuts on the derelict website.
In order to use DerelictGL and DerelictSDL do I simply need to
import
derelict.opengl.gl and import derelict.sdl.sdl and then
initialize the
modules by typing DerelictSDL.load() , DerelictGL.load()?
After this am I free to use SDL/OpenGL functions, like
SDL_Init(...),
SDL_Quit(); etc?
No you need also do init opengl after creating the context,
here's how I am (was) doing it:
--
static this() {
DerelictSDL.load();
DerelictGL.load();
}
void main() {
writefln("main");
if(SDL_Init(SDL_INIT_VIDEO)) {
writefln("error: SDL_INIT_VIDEO");
return;
} else {
writefln("no error (SDL_INIT_VIDEO)");
}
SDL_WM_SetCaption("titel", "nirgends");
SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 16);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 0);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
//SDL_SetVideoMode(1000, 800, 32, SDL_OPENGL |
SDL_RESIZABLE);
SDL_SetVideoMode(1000, 800, 32, SDL_OPENGL);
DerelictGL.loadModernVersions(GLVersion.GL30);
DerelictGL.loadExtendedVersions();
//DerelictGL.loadExtensions();
// rendering goes here
}
---
Re: D, Derelict2, and OpenGL
Am 23.02.2012 01:20, schrieb Chris Pons:
Hey David and Vijay,
Thank you for the swift replies. It seems like this foray into D and
OpenGL could be a bit overwhelming considering I would be learning D and
SDL/OpenGL at the same time. So because of this, i'm going to make sure
I have a solid base in D to start with.
I am an Intermediate level C++ programmer, and I have used
SDL/SFML/DirectX so the majority so far in the D programming book is
very familiar.
I however, do have a newbie Derelict2/OpenGL question. I have a basic
program that simply spawns a window using SDL which I found from one of
the SDL/OpenGL tuts on the derelict website.
In order to use DerelictGL and DerelictSDL do I simply need to import
derelict.opengl.gl and import derelict.sdl.sdl and then initialize the
modules by typing DerelictSDL.load() , DerelictGL.load()?
After this am I free to use SDL/OpenGL functions, like SDL_Init(...),
SDL_Quit(); etc?
No you need also do init opengl after creating the context, here's how I
am (was) doing it:
--
static this() {
DerelictSDL.load();
DerelictGL.load();
}
void main() {
writefln("main");
if(SDL_Init(SDL_INIT_VIDEO)) {
writefln("error: SDL_INIT_VIDEO");
return;
} else {
writefln("no error (SDL_INIT_VIDEO)");
}
SDL_WM_SetCaption("titel", "nirgends");
SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 16);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 0);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
//SDL_SetVideoMode(1000, 800, 32, SDL_OPENGL | SDL_RESIZABLE);
SDL_SetVideoMode(1000, 800, 32, SDL_OPENGL);
DerelictGL.loadModernVersions(GLVersion.GL30);
DerelictGL.loadExtendedVersions();
//DerelictGL.loadExtensions();
// rendering goes here
}
---
Re: D, Derelict2, and OpenGL
Hey David and Vijay, Thank you for the swift replies. It seems like this foray into D and OpenGL could be a bit overwhelming considering I would be learning D and SDL/OpenGL at the same time. So because of this, i'm going to make sure I have a solid base in D to start with. I am an Intermediate level C++ programmer, and I have used SDL/SFML/DirectX so the majority so far in the D programming book is very familiar. I however, do have a newbie Derelict2/OpenGL question. I have a basic program that simply spawns a window using SDL which I found from one of the SDL/OpenGL tuts on the derelict website. In order to use DerelictGL and DerelictSDL do I simply need to import derelict.opengl.gl and import derelict.sdl.sdl and then initialize the modules by typing DerelictSDL.load() , DerelictGL.load()? After this am I free to use SDL/OpenGL functions, like SDL_Init(...), SDL_Quit(); etc?
Re: D, Derelict2, and OpenGL
I am doing almost exactly what you are doing, and to get more familiar with both SDL/OpenGL and D, I used Derelict2. To get familiar with basic graphics in SDL, I used this C++ tutorial, http://www.sdltutorials.com/. The functions pretty much convert 1-to-1 in Derelict2. If it helps, I also have a small project that is hopefully simple enough that it is educational. https://github.com/vnayar/dsdl - Vijay On Wed, 22 Feb 2012, Chris Pons wrote: I have been reading the book "The D Programming Language" and am really enjoying D. However, my current motivation to use D was specifically for programming through OpenGL, and I was excited when I found out Dereict2 provided support for OpenGL. My current Gfx card can only support up to OpenGL 3.3, Can Derelict2 support up to OpenGL 3.3? Also, and most importantly, would it be possible for me to follow a book such as the "Red Book" to learn about using OpenGL with D? Does anyone have a recommendation for a book about OpenGL that is geared towards people new to OpenGL?
Re: D, Derelict2, and OpenGL
Am 22.02.2012 23:36, schrieb Chris Pons: I have been reading the book "The D Programming Language" and am really enjoying D. However, my current motivation to use D was specifically for programming through OpenGL, and I was excited when I found out Dereict2 provided support for OpenGL. My current Gfx card can only support up to OpenGL 3.3, Can Derelict2 support up to OpenGL 3.3? Also, and most importantly, would it be possible for me to follow a book such as the "Red Book" to learn about using OpenGL with D? Does anyone have a recommendation for a book about OpenGL that is geared towards people new to OpenGL? Hello, Yes Derelict2 supports OpenGL 3(.3), you maybe wanna take a look at Derelict3, but be aware, that's just a binding to the gl3-Header, which means you dont have the deprecated function-set (aka. fixed pipeline, <3.0). You can also follow any OpenGL-programming book you like, you've just to port the examples to D, which isn't that hard (opengl function names stay the same), I did it also. Sometimes it's a bit tricky, but it's really doable (e.g. .sizeof on a dynamic array does not return it's size in memory as you would expect as a C-programmer). I used http://www.arcsynthesis.org/gltut/ to teach myself OpenGL, all in all it's a great book, but the source-code is in my opinion really "ugly" and you can't port all the code (well you can but that will take you very long, since they are using their own mesh-formats and loader), therefor I've written some librarys which may be usefule for you: https://bitbucket.org/dav1d/gljm - gljm loads meshes from 2 common formats (.ply and .obj, blender e.g. can export to them) and a custom json format. https://bitbucket.org/dav1d/gl3n - gl3n which implements vector/matrix/quaternion math. Hope this helps - David
