1 files changed, 319 insertions, 0 deletions
diff --git a/demo/fancy/main.lua b/demo/fancy/main.lua
new file mode 100644
index 0000000..54472c5
--- /dev/null
+++ b/demo/fancy/main.lua
@@ -0,0 +1,319 @@
+local gl = honey.gl
+local window = honey.window
+
+
+--===== initialize audio =====--
+
+local result, engine = honey.ma.engine_init({})
+honey.ma.engine_play_sound(engine, 'example_sound.ogg', nil)
+
+
+--====== 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.Viewport(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 vec3 pos;
+out vec2 TexCoord;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(aPos, 1.0);
+    TexCoord = aTexCoord;
+    pos = aPos;
+}
+]]
+
+local fragmentShaderSource = [[
+#version 330 core
+out vec4 FragColor;
+  
+in vec3 pos;
+in vec2 TexCoord;
+
+uniform sampler2D ourTexture;
+
+void main()
+{
+	// FragColor = vec4(pos, 1.0f);
+    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 attrib, shapes, materials = honey.tinyobj.parse_obj('suzanne.obj', 1)
+print(#attrib.vertices)
+print(#attrib.face_num_verts)
+
+print("mesh face_offset", shapes[1].face_offset)
+print("mesh length", shapes[1].length)
+print("#attrib.faces", #attrib.faces)
+print("#attrib.face_num_verts", #attrib.face_num_verts)
+
+local suzanne = {}
+suzanne.vertices = {}
+suzanne.indices = {}
+
+function addVertex(vertex)
+	local pos = 3*vertex.v_idx
+	table.insert(suzanne.vertices, attrib.vertices[pos+1])
+	table.insert(suzanne.vertices, attrib.vertices[pos+2])
+	table.insert(suzanne.vertices, attrib.vertices[pos+3])
+
+	local tex = 3*vertex.vt_idx
+	table.insert(suzanne.vertices, attrib.texcoords[tex+1])
+	table.insert(suzanne.vertices, attrib.texcoords[tex+2])
+
+	table.insert(suzanne.indices, #suzanne.indices)
+end
+
+local start = shapes[1].face_offset
+local finish = start + shapes[1].length
+for i=start,finish-1 do
+	local numVerts = attrib.face_num_verts[i+1]
+	for j=0,numVerts-1 do
+		local vertex = attrib.faces[(3*i)+j+1]
+		addVertex(vertex)
+	end
+end
+
+--for i, vertex in ipairs(suzanne.vertices) do
+--	io.write(tostring(vertex) .. ", ")
+--	if i % 3 == 0 then print() end
+--end
+--print()
+--
+--local indices = {}
+--for i=1,#suzanne.indices do
+--	io.write(tostring(suzanne.indices[i]) .. ", ")
+--	if i % 3 == 0 then print() end
+--end
+--print()
+
+
+print("#suzanne.vertices", #suzanne.vertices)
+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)
+
+local size = 5
+gl.VertexAttribPointer(0, 3, false, size, 0)
+gl.EnableVertexAttribArray(0)
+gl.VertexAttribPointer(1, 2, false, size, 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_create()
+local axis1 = honey.glm.vec3_create()
+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_create()
+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_create()
+honey.glm.mat4_identity(view)
+local translation = honey.glm.vec3_create()
+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_create()
+honey.glm.perspective(math.rad(45), 800/600, 0.1, 100, projection)
+
+
+--====== main loop ======--
+
+local transform = honey.glm.mat4_create()
+
+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, #suzanne.indices, gl.UNSIGNED_INT, 0)
+
+	window.swapBuffers(w)
+	window.pollEvents()
+end
+
+--===== shut down =====--
+
+window.destroy(w)
+gl.Terminate()
+honey.ma.engine_uninit(engine)
+--image.surface_destroy(surface)
+--image.context_destroy(cr)