func render(w *glfw.Window, r *gResources) {
/*
width, height := w.GetFramebufferSize()
gl.Viewport(0, 0, int32(width), int32(height))
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity()
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
*/
////////////////
gl.UseProgram(r.program)
gl.Uniform1f(r.uniforms.fadeFactor, r.fadeFactor)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, r.textures[0])
gl.Uniform1i(r.uniforms.textures[0], 0)
gl.ActiveTexture(gl.TEXTURE1)
gl.BindTexture(gl.TEXTURE_2D, r.textures[1])
gl.Uniform1i(r.uniforms.textures[1], 1)
gl.BindBuffer(gl.ARRAY_BUFFER, r.vertexBuffer)
gl.VertexAttribPointer(
uint32(r.attributes.position), /* attribute */
2, /* size */
gl.FLOAT, /* type */
false, /* normalized? */
8, /* stride */
gl.PtrOffset(0)) /* array buffer offset */
gl.EnableVertexAttribArray(uint32(r.attributes.position))
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, r.elementBuffer)
gl.DrawElements(
gl.TRIANGLE_STRIP, /* mode */
4, /* count */
gl.UNSIGNED_INT, /* type */
gl.PtrOffset(0)) /* element array buffer offset */
gl.DisableVertexAttribArray(uint32(r.attributes.position))
}
func render(w *glfw.Window, r *gResources) {
width, height := w.GetFramebufferSize()
ratio := float32(width) / float32(height)
var xmul, ymul float32
if ratio > 1 {
xmul, ymul = ra/ratio, ra
} else {
xmul, ymul = ra, ra*ratio
}
d := time.Since(start).Seconds()
sin := float32(math.Sin(d))
cos := float32(math.Cos(d))
gl.Viewport(0, 0, int32(width), int32(height))
gl.Clear(gl.COLOR_BUFFER_BIT)
////////////////
// axes
gl.UseProgram(r.program1)
gl.BindBuffer(gl.ARRAY_BUFFER, r.vertexBuffer1)
gl.VertexAttribPointer(
uint32(r.attributes1.position), // attribute
2, // size
gl.FLOAT, // type
false, // normalized?
8, // stride
gl.PtrOffset(0)) // array buffer offset
gl.EnableVertexAttribArray(uint32(r.attributes1.position))
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, r.elementBuffer1)
gl.LineWidth(1)
gl.DrawElements(
gl.LINES, // mode
4, // count
gl.UNSIGNED_INT, // type
gl.PtrOffset(0)) // element array buffer offset
gl.DisableVertexAttribArray(uint32(r.attributes1.position))
////////////////
// triangle
gl.UseProgram(r.program2)
gl.Uniform1f(r.uniforms2.xmul, xmul)
gl.Uniform1f(r.uniforms2.ymul, ymul)
gl.Uniform1f(r.uniforms2.sin, sin)
gl.Uniform1f(r.uniforms2.cos, cos)
gl.BindBuffer(gl.ARRAY_BUFFER, r.vertexBuffer2)
gl.VertexAttribPointer(
uint32(r.attributes2.position), // attribute
2, // size
gl.FLOAT, // type
false, // normalized?
8, // stride
gl.PtrOffset(0)) // array buffer offset
gl.EnableVertexAttribArray(uint32(r.attributes2.position))
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, r.elementBuffer2)
gl.EnableVertexAttribArray(uint32(r.attributes2.color))
gl.BindBuffer(gl.ARRAY_BUFFER, r.colorBuffer2)
gl.VertexAttribPointer(
uint32(r.attributes2.color), // attribute
3, // size
gl.FLOAT, // type
false, // normalized?
0, // stride
gl.PtrOffset(0)) // array buffer offset
gl.DrawElements(
gl.TRIANGLES, // mode
3, // count
gl.UNSIGNED_INT, // type
gl.PtrOffset(0)) // element array buffer offset
////////////////
// circle
gl.BindBuffer(gl.ARRAY_BUFFER, r.vertexBuffer3)
gl.VertexAttribPointer(
uint32(r.attributes2.position), // attribute
2, // size
gl.FLOAT, // type
false, // normalized?
8, // stride
gl.PtrOffset(0)) // array buffer offset
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, r.elementBuffer3)
gl.BindBuffer(gl.ARRAY_BUFFER, r.colorBuffer3)
gl.VertexAttribPointer(
uint32(r.attributes2.color), // attribute
3, // size
gl.FLOAT, // type
false, // normalized?
0, // stride
gl.PtrOffset(0)) // array buffer offset
gl.LineWidth(5)
gl.DrawElements(
gl.LINE_LOOP, // mode
r.len3, // count
gl.UNSIGNED_INT, // type
gl.PtrOffset(0)) // element array buffer offset
gl.DisableVertexAttribArray(uint32(r.attributes2.color))
gl.DisableVertexAttribArray(uint32(r.attributes2.position))
}