add demo script

1 files changed, 101 insertions, 0 deletions

diff --git a/demo/honey.lua b/demo/honey.lua
new file mode 100644
index 0000000..489f022
--- /dev/null
+++ b/demo/honey.lua
@@ -0,0 +1,101 @@
+local gl = honey.gl
+local window = honey.window
+
+gl.errorName = function(errorCode)
+	for name, code in pairs(gl.errorType) do
+		if code == errorCode then return name end
+	end
+	return 'unknown'
+end
+
+gl.init()
+window.setHint(window.hintType.contextVersionMajor, 3)
+window.setHint(window.hintType.contextVersionMinor, 3)
+window.setHint(window.hintType.openGlProfile, window.profileType.openGlCoreProfile)
+
+local w = window.create(640, 480, 'hello, world!')
+window.makeContextCurrent(w)
+gl.initGlad()
+
+window.setFramebufferSizeCallback(w, function(_, width, height)
+	print(string.format("resize: (%d, %d)", width, height))
+	gl.setViewport(0, 0, width, height)
+end)
+
+
+local vertexShaderSource = [[
+#version 330 core
+layout (location = 0) in vec3 aPos;
+out vec3 pos;
+
+void main()
+{
+    gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
+    pos = aPos;
+}
+]]
+
+local fragmentShaderSource = [[
+#version 330 core
+in vec3 pos;
+out vec4 FragColor;
+
+void main()
+{
+	FragColor = vec4(pos.x+0.5, 0.0f, 2*(pos.y+pos.x), 1.0f);
+}
+]]
+
+local vertexShader = gl.createShader(gl.shaderType.vertexShader)
+gl.setShaderSource(vertexShader, vertexShaderSource)
+gl.compileShader(vertexShader)
+local fragmentShader = gl.createShader(gl.shaderType.fragmentShader)
+gl.setShaderSource(fragmentShader, fragmentShaderSource)
+gl.compileShader(fragmentShader)
+
+local shader = gl.createProgram()
+gl.programAttachShader(shader, vertexShader)
+gl.programAttachShader(shader, fragmentShader)
+gl.linkProgram(shader)
+gl.deleteShader(vertexShader)
+gl.deleteShader(fragmentShader)
+
+
+local vertices = {
+    -0.5, -0.5, 0.0,
+     0.5, -0.5, 0.0,
+     0.0,  0.5, 0.0
+}  
+
+local vertexArray = gl.createVertexArray()
+
+local vertexBuffer = gl.createBuffer()
+gl.bindVertexArray(vertexArray)
+
+gl.bindBuffer(gl.bufferTarget.arrayBuffer, vertexBuffer)
+local err = gl.getError()
+if err ~= gl.errorType.noError then error(gl.errorName(err)) end
+gl.bufferData(gl.bufferTarget.arrayBuffer, vertices, gl.bufferUsage.staticDraw)
+if gl.getError() ~= gl.errorType.noError then error(gl.getError()) end
+
+gl.vertexAttribPointer(0, 3, false, 3, 0)
+if gl.getError() ~= gl.errorType.noError then error(gl.getError()) end
+gl.vertexArrayEnableAttrib(0)
+if gl.getError() ~= gl.errorType.noError then error(gl.getError()) end
+
+gl.bindBuffer(gl.bufferTarget.arrayBuffer, 0)
+if gl.getError() ~= gl.errorType.noError then error(gl.getError()) end
+
+while not window.shouldClose(w) do
+	gl.setClearColor(0.2, 0.3, 0.3, 1.0)
+	gl.clear(gl.bufferMask.colorBuffer);
+
+	gl.useProgram(shader)
+	gl.bindVertexArray(vertexArray)
+	gl.drawArrays(gl.primitiveType.triangles, 0, 3)
+
+	window.swapBuffers(w)
+	window.pollEvents()
+end
+window.destroy(w)
+gl.terminate()