odin(sdl-opengl-rendering): Use a VAO
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SSH key fingerprint:
SHA256:UUF9JT2s8Xfyv76b8ZuVL7XrmimH4o49p4b+iexbVH4
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@ -1,7 +1,9 @@
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#version 140
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#version 330
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out vec4 LFragment;
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out vec4 FragColor;
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in vec4 vertexColor;
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void main() {
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LFragment = vec4( 1.0, 1.0, 1.0, 1.0 );
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FragColor = vertexColor;
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}
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@ -9,22 +9,27 @@ State :: struct {
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window: ^sdl3.Window,
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program: u32,
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vertex_pos_location: u32,
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vao: u32,
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vbo: u32,
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ibo: u32,
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wireframe: bool,
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}
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init :: proc() -> (state: State, ok: bool) {
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GL_MAJOR :: 3
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GL_MINOR :: 1
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GL_MINOR :: 3
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sdl3.Init(sdl3.InitFlags{.VIDEO}) or_return
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sdl3.GL_SetAttribute(.CONTEXT_MAJOR_VERSION, GL_MAJOR) or_return
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sdl3.GL_SetAttribute(.CONTEXT_MINOR_VERSION, GL_MINOR) or_return
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sdl3.GL_SetAttribute(.CONTEXT_PROFILE_MASK, c.int(sdl3.GL_CONTEXT_PROFILE_CORE)) or_return
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sdl3.GL_SetSwapInterval(1) // vsync
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state.window = sdl3.CreateWindow("SDL visual experiment", 640, 480, {.FULLSCREEN, .OPENGL})
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(state.window != nil) or_return
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sdl3.StartTextInput(state.window) or_return
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gl_ctx := sdl3.GL_CreateContext(state.window)
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(gl_ctx != nil) or_return
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@ -36,35 +41,48 @@ init :: proc() -> (state: State, ok: bool) {
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) or_return
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// log.debug("Doing Opengl stuff")
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vertex_pos_location := OpenGL.GetAttribLocation(state.program, "LVertexPos2D")
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vertex_pos_location := OpenGL.GetAttribLocation(state.program, "aPos")
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(vertex_pos_location != -1) or_return
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state.vertex_pos_location = u32(vertex_pos_location)
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OpenGL.ClearColor(0, 0, 0, 1)
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// VBO data
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vertex_data := [?]f32{-0.5, -0.5, 0.5, -0.5, 0.5, 0.5, -0.5, 0.5}
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vbos: [1]u32
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vertex_data := 2 * [?]f32{-0.5, -0.5, 0.5, -0.5, 0.5, 0.5, -0.5, 0.5}
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// IBO data
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index_data := [?]u32{0, 1, 2, 3}
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ibos: [1]u32
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OpenGL.GenVertexArrays(1, &state.vao)
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OpenGL.BindVertexArray(state.vao)
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//Create VBO
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OpenGL.GenBuffers(1, auto_cast &vbos)
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OpenGL.BindBuffer(OpenGL.ARRAY_BUFFER, vbos[0])
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OpenGL.GenBuffers(1, &state.vbo)
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OpenGL.BindBuffer(OpenGL.ARRAY_BUFFER, state.vbo)
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OpenGL.BufferData(OpenGL.ARRAY_BUFFER, 2 * 4 * size_of(f32), &vertex_data, OpenGL.STATIC_DRAW)
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state.vbo = vbos[0]
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OpenGL.GenBuffers(1, auto_cast &ibos)
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OpenGL.BindBuffer(OpenGL.ELEMENT_ARRAY_BUFFER, ibos[0])
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OpenGL.EnableVertexAttribArray(state.vertex_pos_location)
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OpenGL.VertexAttribPointer(
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state.vertex_pos_location,
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2,
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OpenGL.FLOAT,
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false,
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2 * size_of(f32),
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0,
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)
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OpenGL.GenBuffers(1, auto_cast &state.ibo)
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OpenGL.BindBuffer(OpenGL.ELEMENT_ARRAY_BUFFER, state.ibo)
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OpenGL.BufferData(
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OpenGL.ELEMENT_ARRAY_BUFFER,
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4 * size_of(u32),
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&index_data,
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OpenGL.STATIC_DRAW,
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)
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state.ibo = ibos[0]
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OpenGL.BindVertexArray(0)
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OpenGL.DisableVertexAttribArray(state.vertex_pos_location)
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return state, true
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}
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@ -75,25 +93,19 @@ render :: proc(state: State) {
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OpenGL.UseProgram(state.program)
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defer OpenGL.UseProgram(0)
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OpenGL.EnableVertexAttribArray(state.vertex_pos_location)
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defer OpenGL.DisableVertexAttribArray(state.vertex_pos_location)
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if state.wireframe {
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OpenGL.PolygonMode(OpenGL.FRONT_AND_BACK, OpenGL.LINE)
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} else {
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OpenGL.PolygonMode(OpenGL.FRONT_AND_BACK, OpenGL.FILL)
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}
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OpenGL.BindBuffer(OpenGL.ARRAY_BUFFER, state.vbo)
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OpenGL.VertexAttribPointer(
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state.vertex_pos_location,
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2,
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OpenGL.FLOAT,
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false,
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2 * size_of(f32),
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0,
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)
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OpenGL.BindBuffer(OpenGL.ELEMENT_ARRAY_BUFFER, state.ibo)
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OpenGL.BindVertexArray(state.vao)
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OpenGL.DrawElements(OpenGL.TRIANGLE_FAN, 4, OpenGL.UNSIGNED_INT, nil)
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}
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close :: proc(state: State) {
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OpenGL.DeleteProgram(state.program)
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_ = sdl3.StopTextInput(state.window)
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sdl3.DestroyWindow(state.window)
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sdl3.Quit()
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}
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@ -105,23 +117,25 @@ main :: proc() {
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defer close(state)
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quit := false
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log.debug("Created context")
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for !quit {
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sdl3.StartTextInput(state.window) or_break
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event: sdl3.Event
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for sdl3.PollEvent(&event) {
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#partial switch event.type {
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case .WINDOW_RESIZED:
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OpenGL.Viewport(0, 0, event.window.data1, event.window.data2)
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case .QUIT:
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quit = true
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case .TEXT_INPUT:
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switch ([^]u8)(event.text.text)[0] {
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case 'w':
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state.wireframe = !state.wireframe
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}
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log.debug(event.text)
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}
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}
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render(state)
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sdl3.GL_SwapWindow(state.window)
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sdl3.StopTextInput(state.window) or_break
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}
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}
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// //Handle keypress
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// else if( e.type == SDL_EVENT_TEXT_INPUT )
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// handleKeys( e.text.text[ 0 ] );
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@ -1,7 +1,10 @@
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#version 140
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#version 330
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in vec2 LVertexPos2D;
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in vec2 aPos;
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out vec4 vertexColor;
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void main() {
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gl_Position = vec4(LVertexPos2D.x, LVertexPos2D.y, 0, 1 );
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gl_Position = vec4(aPos.x, aPos.y, 0, 1);
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vertexColor = vec4((aPos.x + 1) / 2, (aPos.y + 1) / 2, 1, 1);
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}
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