prescientmoon/solar-conflux
prescientmoon/solar-conflux
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Display a rect on screen

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This commit is contained in:
prescientmoon 2025-03-30 04:50:15 +02:00
parent de69cd8691
commit 41fdea4be2
Signed by: prescientmoon
SSH key fingerprint: SHA256:UUF9JT2s8Xfyv76b8ZuVL7XrmimH4o49p4b+iexbVH4
2 changed files with 75 additions and 192 deletions
odin/sdl-opengl-rendering
flake.nix
src
main.odin

2
odin/sdl-opengl-rendering/flake.nix
View file

@ -55,6 +55,7 @@
# {{{ Shell
devShell = pkgs.mkShell rec {
nativeBuildInputs = [
pkgs.pkg-config
pkgs.entr # File change detection
pkgs.odin # Compiler
pkgs.mold # Linker
@ -76,7 +77,6 @@
pkgs.xorg.libXinerama
pkgs.xorg.libXcursor
pkgs.sdl3
raylib
];
LD_LIBRARY_PATH = with pkgs; lib.makeLibraryPath buildInputs;

265
odin/sdl-opengl-rendering/src/main.odin
View file

@ -6,181 +6,100 @@ import "vendor:OpenGL"
import "vendor:sdl3"
State :: struct {
window: ^sdl3.Window,
window: ^sdl3.Window,
program: u32,
vertex_pos_location: u32,
vbo: u32,
ibo: u32,
}
init :: proc() -> (state: State, ok: bool) {
GL_MAJOR :: 3
GL_MINOR :: 1
sdl3.Init(sdl3.InitFlags{.VIDEO}) or_return
sdl3.GL_SetAttribute(.CONTEXT_MAJOR_VERSION, 3) or_return
sdl3.GL_SetAttribute(.CONTEXT_MINOR_VERSION, 1) or_return
sdl3.GL_SetAttribute(.CONTEXT_MAJOR_VERSION, GL_MAJOR) or_return
sdl3.GL_SetAttribute(.CONTEXT_MINOR_VERSION, GL_MINOR) or_return
sdl3.GL_SetAttribute(.CONTEXT_PROFILE_MASK, c.int(sdl3.GL_CONTEXT_PROFILE_CORE)) or_return
window := sdl3.CreateWindow("SDL visual experiment", 640, 480, {.FULLSCREEN, .OPENGL})
(window != nil) or_return
state.window = sdl3.CreateWindow("SDL visual experiment", 640, 480, {.FULLSCREEN, .OPENGL})
(state.window != nil) or_return
gl_ctx := sdl3.GL_CreateContext(window)
gl_ctx := sdl3.GL_CreateContext(state.window)
(gl_ctx != nil) or_return
// Init GL here
OpenGL.load_up_to(GL_MAJOR, GL_MINOR, sdl3.gl_set_proc_address)
return {window = window}, true
state.program = OpenGL.load_shaders_source(
#load("./vert.glsl"),
#load("./frag.glsl"),
) or_return
// log.debug("Doing Opengl stuff")
vertex_pos_location := OpenGL.GetAttribLocation(state.program, "LVertexPos2D")
(vertex_pos_location != -1) or_return
state.vertex_pos_location = u32(vertex_pos_location)
OpenGL.ClearColor(0, 0, 0, 1)
// VBO data
vertex_data := [?]f32{-0.5, -0.5, 0.5, -0.5, 0.5, 0.5, -0.5, 0.5}
vbos: [1]u32
// IBO data
index_data := [?]u32{0, 1, 2, 3}
ibos: [1]u32
//Create VBO
OpenGL.GenBuffers(1, auto_cast &vbos)
OpenGL.BindBuffer(OpenGL.ARRAY_BUFFER, vbos[0])
OpenGL.BufferData(OpenGL.ARRAY_BUFFER, 2 * 4 * size_of(f32), &vertex_data, OpenGL.STATIC_DRAW)
state.vbo = vbos[0]
OpenGL.GenBuffers(1, auto_cast &ibos)
OpenGL.BindBuffer(OpenGL.ELEMENT_ARRAY_BUFFER, ibos[0])
OpenGL.BufferData(
OpenGL.ELEMENT_ARRAY_BUFFER,
4 * size_of(u32),
&index_data,
OpenGL.STATIC_DRAW,
)
state.ibo = ibos[0]
return state, true
}
init_gl :: proc() -> (ok: bool) {
program_id := OpenGL.load_shaders_source(#load("./vert.glsl"), #load("./frag.glsl")) or_return
return true
render :: proc(state: State) {
OpenGL.Clear(OpenGL.COLOR_BUFFER_BIT)
OpenGL.UseProgram(state.program)
defer OpenGL.UseProgram(0)
OpenGL.EnableVertexAttribArray(state.vertex_pos_location)
defer OpenGL.DisableVertexAttribArray(state.vertex_pos_location)
OpenGL.BindBuffer(OpenGL.ARRAY_BUFFER, state.vbo)
OpenGL.VertexAttribPointer(
state.vertex_pos_location,
2,
OpenGL.FLOAT,
false,
2 * size_of(f32),
0,
)
OpenGL.BindBuffer(OpenGL.ELEMENT_ARRAY_BUFFER, state.ibo)
OpenGL.DrawElements(OpenGL.TRIANGLE_FAN, 4, OpenGL.UNSIGNED_INT, nil)
}
// //Get vertex attribute location
// gVertexPos2DLocation = glGetAttribLocation( gProgramID, "LVertexPos2D" );
// if( gVertexPos2DLocation == -1 )
// {
// SDL_Log( "LVertexPos2D is not a valid glsl program variable!\n" );
// success = false;
// }
// else
// {
// //Initialize clear color
// glClearColor( 0.f, 0.f, 0.f, 1.f );
//
// //VBO data
// GLfloat vertexData[] =
// {
// -0.5f, -0.5f,
// 0.5f, -0.5f,
// 0.5f, 0.5f,
// -0.5f, 0.5f
// };
//
// //IBO data
// GLuint indexData[] = { 0, 1, 2, 3 };
//
// //Create VBO
// glGenBuffers( 1, &gVBO );
// glBindBuffer( GL_ARRAY_BUFFER, gVBO );
// glBufferData( GL_ARRAY_BUFFER, 2 * 4 * sizeof(GLfloat), vertexData, GL_STATIC_DRAW );
//
// //Create IBO
// glGenBuffers( 1, &gIBO );
// glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, gIBO );
// glBufferData( GL_ELEMENT_ARRAY_BUFFER, 4 * sizeof(GLuint), indexData, GL_STATIC_DRAW );
// void render()
// {
// //Clear color buffer
// glClear( GL_COLOR_BUFFER_BIT );
//
// //Render quad
// if( gRenderQuad )
// {
// //Bind program
// glUseProgram( gProgramID );
//
// //Enable vertex position
// glEnableVertexAttribArray( gVertexPos2DLocation );
//
// //Set vertex data
// glBindBuffer( GL_ARRAY_BUFFER, gVBO );
// glVertexAttribPointer( gVertexPos2DLocation, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GLfloat), NULL );
//
// //Set index data and render
// glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, gIBO );
// glDrawElements( GL_TRIANGLE_FAN, 4, GL_UNSIGNED_INT, NULL );
//
// //Disable vertex position
// glDisableVertexAttribArray( gVertexPos2DLocation );
//
// //Unbind program
// glUseProgram( 0 );
// }
// }
close :: proc(state: State) {
OpenGL.DeleteProgram(state.program)
sdl3.DestroyWindow(state.window)
sdl3.Quit()
}
// void close()
// {
// //Deallocate program
// glDeleteProgram( gProgramID );
//
// //Destroy window
// SDL_DestroyWindow( gWindow );
// gWindow = NULL;
//
// //Quit SDL subsystems
// SDL_Quit();
// }
//
// void printProgramLog( GLuint program )
// {
// //Make sure name is shader
// if( glIsProgram( program ) )
// {
// //Program log length
// int infoLogLength = 0;
// int maxLength = infoLogLength;
//
// //Get info string length
// glGetProgramiv( program, GL_INFO_LOG_LENGTH, &maxLength );
//
// //Allocate string
// char* infoLog = new char[ maxLength ];
//
// //Get info log
// glGetProgramInfoLog( program, maxLength, &infoLogLength, infoLog );
// if( infoLogLength > 0 )
// {
// //Print Log
// SDL_Log( "%s\n", infoLog );
// }
//
// //Deallocate string
// delete[] infoLog;
// }
// else
// {
// SDL_Log( "Name %d is not a program\n", program );
// }
// }
//
// void printShaderLog( GLuint shader )
// {
// //Make sure name is shader
// if( glIsShader( shader ) )
// {
// //Shader log length
// int infoLogLength = 0;
// int maxLength = infoLogLength;
//
// //Get info string length
// glGetShaderiv( shader, GL_INFO_LOG_LENGTH, &maxLength );
//
// //Allocate string
// char* infoLog = new char[ maxLength ];
//
// //Get info log
// glGetShaderInfoLog( shader, maxLength, &infoLogLength, infoLog );
// if( infoLogLength > 0 )
// {
// //Print Log
// SDL_Log( "%s\n", infoLog );
// }
//
// //Deallocate string
// delete[] infoLog;
// }
// else
// {
// SDL_Log( "Name %d is not a shader\n", shader );
// }
// }
main :: proc() {
context.logger = log.create_console_logger()
log.debug("Starting")
state, ok := init()
log.assertf(ok, "Got SDL error: %v", sdl3.GetError())
defer close(state)
@ -198,47 +117,11 @@ main :: proc() {
}
}
render(state)
sdl3.GL_SwapWindow(state.window)
sdl3.StopTextInput(state.window) or_break
}
}
// //Event handler
// SDL_Event e;
//
// //Enable text input
// SDL_StartTextInput( gWindow );
//
// //While application is running
// while( !quit )
// {
// //Handle events on queue
// while( SDL_PollEvent( &e ) != 0 )
// {
// //User requests quit
// if( e.type == SDL_EVENT_QUIT )
// {
// quit = true;
// }
// //Handle keypress
// else if( e.type == SDL_EVENT_TEXT_INPUT )
// {
// handleKeys( e.text.text[ 0 ] );
// }
// }
//
// //Render quad
// render();
//
// //Update screen
// SDL_GL_SwapWindow( gWindow );
// }
//
// //Disable text input
// SDL_StopTextInput( gWindow );
// }
//
// //Free resources and close SDL
// close();
//
// return 0;
// }