84 lines
2.2 KiB
Standard ML
84 lines
2.2 KiB
Standard ML
structure GlDraw =
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struct
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open CML
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type t = { window: MLton.Pointer.t }
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fun createShader (shaderType, shaderString) =
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let
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val shader = Gles3.createShader shaderType
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val _ = Gles3.shaderSource (shader, shaderString)
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val _ = Gles3.compileShader shader
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in
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shader
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end
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fun createProgram (vertexShader, fragmentShader) =
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let
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val program = Gles3.createProgram ()
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val _ = Gles3.attachShader (program, vertexShader)
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val _ = Gles3.attachShader (program, fragmentShader)
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val _ = Gles3.linkProgram program
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in
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program
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end
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fun create window =
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let
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(* create vertex buffer, program, etc. *)
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val textVertexBuffer = Gles3.createBuffer ()
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val xyrgbVertexShader = createShader
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(Gles3.VERTEX_SHADER, GlShaders.xyrgbVertexShaderString)
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val rgbFragmentShader = createShader
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(Gles3.FRAGMENT_SHADER, GlShaders.rgbFragmentShaderString)
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val placeholderProgram = createProgram (xyrgbVertexShader, rgbFragmentShader)
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in
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{window = window}
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end
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fun drawXyrgb (vertexBuffer, program, drawLength) =
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if drawLength > 0 then
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let
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val _ = Gles3.bindBuffer vertexBuffer
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(* enable xy component from uploaded array *)
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val _ = Gles3.vertexAttribPointer (0, 2, 5, 0)
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val _ = Gles3.enableVertexAttribArray 0
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(* enable rgb component from uploaded array *)
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val _ = Gles3.vertexAttribPointer (1, 3, 5, 8)
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val _ = Gles3.enableVertexAttribArray 1
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val _ = Gles3.useProgram program
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val _ = Gles3.drawArrays (Gles3.TRIANGLES, 0, drawLength)
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in
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()
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end
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else
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()
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fun helpLoop (shellState as {window, ...}: t) =
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case Glfw.windowShouldClose window of
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false =>
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let
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val _ = Gles3.clearColor (1.0, 1.0, 1.0, 1.0)
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val _ = Gles3.clear ()
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(* todo:
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* - update game state
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* - consume draw messages
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* - finally, draw
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* *)
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val _ = Glfw.swapBuffers window
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val _ = Glfw.waitEvents ()
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in
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helpLoop shellState
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end
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| true => Glfw.terminate ()
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fun loop window =
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let val shellState = create window
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in helpLoop shellState
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end
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end
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