Created
August 9, 2019 20:44
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| vertex shader: | |
| #version 300 es | |
| #ifdef GL_ES | |
| precision mediump float; | |
| #endif | |
| in vec4 Vertex; | |
| uniform mat4 viewProjMatrix; | |
| void main(void) { | |
| gl_Position = viewProjMatrix * Vertex; | |
| } | |
| matrix: | |
| internal var viewProjMatrix = Matrix4() | |
| .makeOrthographic(-0.5, 0.5, -.5, .5, 1.0, 10.0) | |
| .lookAt( | |
| Vector3(0.0f, 0.0f, 1.0f), | |
| Vector3(0.0f, 0.0f, 0.0f), | |
| Vector3(0.0f, 1.0f, 0.0f) | |
| ) | |
| quad: | |
| inner class Quad { | |
| private val vertices = arrayOf( | |
| // Left bottom triangle | |
| -0.5f, 0.5f, 0f, | |
| -0.5f, -0.5f, 0f, | |
| 0.5f, -0.5f, 0f, | |
| // Right top triangle | |
| 0.5f, -0.5f, 0f, | |
| 0.5f, 0.5f, 0f, | |
| -0.5f, 0.5f, 0f | |
| ) | |
| private val indices = arrayOf(0, 1, 2, 3, 4, 5).map { it.toShort() }.toTypedArray() | |
| private var quadVertexBuffer: WebGLBuffer? = null | |
| private var indexBuffer: WebGLBuffer? = null | |
| init { | |
| quadVertexBuffer = gl.createBuffer() | |
| gl { gl.bindBuffer(GL.ARRAY_BUFFER, quadVertexBuffer) } | |
| gl { gl.bufferData(GL.ARRAY_BUFFER, Float32Array(vertices), GL.STATIC_DRAW); } | |
| indexBuffer = gl.createBuffer() | |
| gl { gl.bindBuffer(GL.ELEMENT_ARRAY_BUFFER, indexBuffer); } | |
| gl { gl.bufferData(GL.ELEMENT_ARRAY_BUFFER, Uint16Array(indices), GL.STATIC_DRAW); } | |
| val vertexAttr = gl { gl.getAttribLocation(program, "Vertex") } | |
| gl { gl.vertexAttribPointer(vertexAttr, 3, GL.FLOAT, false, 0, 0) } | |
| gl { gl.enableVertexAttribArray(vertexAttr) } | |
| gl { gl.bindBuffer(GL.ARRAY_BUFFER, null) } | |
| gl { gl.bindBuffer(GL.ELEMENT_ARRAY_BUFFER, null); } | |
| } | |
| internal fun render() { | |
| gl { gl.bindBuffer(GL.ARRAY_BUFFER, quadVertexBuffer) } | |
| gl { gl.bindBuffer(GL.ELEMENT_ARRAY_BUFFER, indexBuffer); } | |
| // Draw the vertices | |
| gl { gl.drawElements(GL.TRIANGLES, indices.size, GL.UNSIGNED_SHORT,0) } | |
| gl { gl.bindBuffer(GL.ARRAY_BUFFER, null) } | |
| gl { gl.bindBuffer(GL.ELEMENT_ARRAY_BUFFER, null); } | |
| } | |
| private fun release() { | |
| gl { gl.bindBuffer(GL.ARRAY_BUFFER, null) } | |
| gl { gl.deleteBuffer(quadVertexBuffer) } | |
| gl { gl.deleteBuffer(indexBuffer) } | |
| } | |
| } |
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