diff options
Diffstat (limited to 'demo/fancy/honey.lua')
| -rw-r--r-- | demo/fancy/honey.lua | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/demo/fancy/honey.lua b/demo/fancy/honey.lua new file mode 100644 index 0000000..4b1526f --- /dev/null +++ b/demo/fancy/honey.lua @@ -0,0 +1,283 @@ +local gl = honey.gl +local window = honey.window + + +--===== initialize audio =====-- + +local engine = honey.audio.engine_init() +honey.audio.engine_play_sound(engine, 'example_sound.ogg') + + +--====== initialize opengl ======-- + +gl.Init() +window.setHint(window.hintType.contextVersionMajor, 3) +window.setHint(window.hintType.contextVersionMinor, 3) +window.setHint(window.hintType.openGlProfile, window.profileType.openGlCoreProfile) + + +--====== create window ======-- + +local w = window.create(640, 480, 'hello, world!') +window.makeContextCurrent(w) +gl.InitGlad() +gl.Enable(gl.DEPTH_TEST) + +window.setFramebufferSizeCallback(w, function(_, width, height) + print(string.format("resize: (%d, %d)", width, height)) + gl.setViewport(0, 0, width, height) +end) + + +--====== compile shaders ======-- + +local vertexShaderSource = [[ +#version 330 core +layout (location = 0) in vec3 aPos; +layout (location = 1) in vec2 aTexCoord; + +uniform mat4 model; +uniform mat4 view; +uniform mat4 projection; + +out vec2 TexCoord; + +void main() +{ + gl_Position = projection * view * model * vec4(aPos, 1.0); + TexCoord = aTexCoord; +} +]] + +local fragmentShaderSource = [[ +#version 330 core +out vec4 FragColor; + +in vec2 TexCoord; + +uniform sampler2D ourTexture; + +void main() +{ + FragColor = texture(ourTexture, TexCoord); +} +]] + +-- vertex shader +local vertexShader = gl.CreateShader(gl.VERTEX_SHADER) +gl.ShaderSource(vertexShader, vertexShaderSource) +gl.CompileShader(vertexShader) + +-- fragment shader +local fragmentShader = gl.CreateShader(gl.FRAGMENT_SHADER) +gl.ShaderSource(fragmentShader, fragmentShaderSource) +gl.CompileShader(fragmentShader) + +-- link +local shader = gl.CreateProgram() +gl.AttachShader(shader, vertexShader) +gl.AttachShader(shader, fragmentShader) +gl.LinkProgram(shader) +-- clean up +gl.DeleteShader(vertexShader) +gl.DeleteShader(fragmentShader) + + +--====== set up mesh data manually ======-- + +local vertices = { +-- positions uvs + 0.5, 0.5, 0.0, 1.0, 1.0, -- top right + 0.5, -0.5, 0.0, 1.0, 0.0, -- bottom right + -0.5, -0.5, 0.0, 0.0, 0.0, -- bottom let + -0.5, 0.5, 0.0, 0.0, 1.0 -- top let +} +local indices = { + 0, 1, 3, -- first triangle + 1, 2, 3 -- second triangle +} + +-- buffers +local vertexArray = gl.GenVertexArrays() +local vertexBuffer = gl.GenBuffers() +local elementBuffer = gl.GenBuffers() + +gl.BindVertexArray(vertexArray) + +gl.BindBuffer(gl.ARRAY_BUFFER, vertexBuffer) +gl.BufferData(gl.ARRAY_BUFFER, gl.FLOAT, vertices, gl.STATIC_DRAW) + +gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, elementBuffer) +gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, gl.UNSIGNED_INT, indices, gl.STATIC_DRAW) + +-- position +gl.VertexAttribPointer(0, 3, false, 5, 0) +gl.EnableVertexAttribArray(0) + +-- uv +gl.VertexAttribPointer(1, 2, false, 5, 3) +gl.EnableVertexAttribArray(1) + + +--===== load mesh from file =====-- + +local scene = honey.import.importFile('suzanne.dae') +local mesh = scene.meshes[1] +local suzanne = {} +suzanne.vertices = {} +print('mesh.vertices', #mesh.vertices) +for i=1,#mesh.vertices do + local position = mesh.vertices[i] + local uv = mesh.uvs[1][i] + table.insert(suzanne.vertices, position.x) + table.insert(suzanne.vertices, position.y) + table.insert(suzanne.vertices, position.z) + table.insert(suzanne.vertices, uv.x) + table.insert(suzanne.vertices, uv.y) +end +suzanne.indices = {} +for _, face in ipairs(mesh.faces) do + assert(#face == 3) + for _, i in ipairs(face) do + table.insert(suzanne.indices, i) + end +end +print('mesh.faces', #mesh.faces) +print('suzanne.indices', #suzanne.indices) + +suzanne.vertexArr = gl.GenVertexArrays() +suzanne.vertexBuf = gl.GenBuffers() +suzanne.elementBuf = gl.GenBuffers() + +gl.BindVertexArray(suzanne.vertexArr) +gl.BindBuffer(gl.ARRAY_BUFFER, suzanne.vertexBuf) +gl.BufferData(gl.ARRAY_BUFFER, gl.FLOAT, suzanne.vertices, gl.STATIC_DRAW) + +gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, suzanne.elementBuf) +gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, gl.UNSIGNED_INT, suzanne.indices, gl.STATIC_DRAW) + +gl.VertexAttribPointer(0, 3, false, 5, 0) +gl.EnableVertexAttribArray(0) +gl.VertexAttribPointer(1, 2, false, 5, 3) +gl.EnableVertexAttribArray(1) + + +--====== load texture ======-- + +local texture = gl.GenTextures() +gl.BindTexture(gl.TEXTURE_2D, texture) + +gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT) +gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT) + +gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR) +gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR) + +local image, width, height = honey.image.load('container.jpg', 3) +gl.TexImage2D( + gl.TEXTURE_2D, 0, + gl.RGB, width, height, + gl.RGB, gl.UNSIGNED_BYTE, + image +) +gl.GenerateMipmap(gl.TEXTURE_2D) +honey.image.destroy(image) + +-- connect shader samplers to texture units +gl.UseProgram(shader) +gl.Uniform1i(gl.GetUniformLocation(shader, 'ourTexture'), 0) + + +--===== generate cairo texture =====-- + +local image = honey.image +local surface = image.surface_create(image.FORMAT_ARGB32, 512, 512) +local cr = image.context_create(surface) +image.context_select_font_face(cr, "sans-serif", image.FONT_SLANT_NORMAL, image.FONT_WEIGHT_NORMAL) +image.context_set_font_size(cr, 32) +image.context_set_source_rgb(cr, 1, 0, 0) +image.context_move_to(cr, 100, 100) +image.context_show_text(cr, "hello, world!") +local data = image.surface_get_data(surface) +gl.BindTexture(gl.TEXTURE_2D, texture) +gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_SWIZZLE_R, gl.BLUE) +gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_SWIZZLE_B, gl.RED) +--gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_SWIZZLE_A, gl.RED) +gl.TexImage2D( + gl.TEXTURE_2D, 0, + gl.RGB, width, height, + gl.RGBA, gl.UNSIGNED_BYTE, + data +) +gl.GenerateMipmap(gl.TEXTURE_2D) + + +--====== matrices ======-- + +local model = honey.glm.mat4() +local axis1 = honey.glm.vec3() +honey.glm.vec3_set(axis1, 0, 1.0) +honey.glm.vec3_set(axis1, 1, 0.0) +honey.glm.vec3_set(axis1, 2, 0.0) + +local axis2 = honey.glm.vec3() +honey.glm.vec3_set(axis2, 0, 0.0) +honey.glm.vec3_set(axis2, 1, 1.0) +honey.glm.vec3_set(axis2, 2, 0.0) + +local view = honey.glm.mat4() +honey.glm.mat4_identity(view) +local translation = honey.glm.vec3() +honey.glm.vec3_set(translation, 0, 0.0) +honey.glm.vec3_set(translation, 1, 0.0) +honey.glm.vec3_set(translation, 2, -3.0) +honey.glm.translate(view, translation) + +local projection = honey.glm.mat4() +honey.glm.perspective(math.rad(45), 800/600, 0.1, 100, projection) + + +--====== main loop ======-- + +local transform = honey.glm.mat4() + +while not window.shouldClose(w) do + local time = window.getTime() + + gl.ClearColor(0.2, 0.3, 0.3, 1.0) + gl.Clear(gl.COLOR_BUFFER_BIT + gl.DEPTH_BUFFER_BIT) + + gl.ActiveTexture(0) + gl.BindTexture(gl.TEXTURE_2D, texture) + + gl.UseProgram(shader) + + local modelL = gl.GetUniformLocation(shader, 'model') + local viewL = gl.GetUniformLocation(shader, 'view') + local projectionL = gl.GetUniformLocation(shader, 'projection') + + honey.glm.mat4_identity(model) + honey.glm.rotate(model, 0.5*math.pi*time, axis2) + honey.glm.rotate(model, math.rad(-90), axis1) + + gl.UniformMatrix4fv(modelL, false, model) + gl.UniformMatrix4fv(viewL, false, view) + gl.UniformMatrix4fv(projectionL, false, projection) + + --gl.BindVertexArray(vertexArray) + --gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, 0) + + gl.BindVertexArray(suzanne.vertexArr) + gl.DrawElements(gl.TRIANGLES, 3*#mesh.faces, gl.UNSIGNED_INT, 0) + + window.swapBuffers(w) + window.pollEvents() +end + +--===== shut down =====-- + +window.destroy(w) +gl.Terminate() +honey.audio.engine_uninit(engine) +image.surface_destroy(surface) +image.context_destroy(cr) |