func (lr *LinesRenderer) Draw(line *LineGeometry, mv mgl32.Mat4, style *LineStyle) (err error) {
var (
dataBytes int = len(line.Vertices) * int(lr.stride)
indexBytes int = len(line.Indices) * int(lr.stride)
elementCount int32 = int32(len(line.Indices))
r, g, b, a = style.Color.RGBA()
)
gl.Uniform1f(lr.thicknessLoc, style.Thickness)
gl.Uniform1f(lr.innerLoc, style.Inner)
gl.Uniform4f(lr.colorLoc, float32(r)/255.0, float32(g)/255.0, float32(b)/255.0, float32(a)/255.0)
gl.UniformMatrix4fv(lr.modelviewLoc, 1, false, &mv[0])
if dataBytes > lr.bufferBytes {
lr.bufferBytes = dataBytes
gl.BufferData(gl.ARRAY_BUFFER, dataBytes, gl.Ptr(line.Vertices), gl.STREAM_DRAW)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, indexBytes, gl.Ptr(line.Indices), gl.STREAM_DRAW)
} else {
gl.BufferSubData(gl.ARRAY_BUFFER, 0, dataBytes, gl.Ptr(line.Vertices))
gl.BufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, indexBytes, gl.Ptr(line.Indices))
}
gl.DrawElements(gl.TRIANGLES, elementCount, gl.UNSIGNED_INT, gl.PtrOffset(0))
if e := gl.GetError(); e != 0 {
err = fmt.Errorf("ERROR: OpenGL error %X", e)
}
return
}
// Rendering this LineRender.
func (lr *LineRender) Render() {
// Binding the appropriate information.
gl.BindVertexArray(lr.vao)
gl.BindBuffer(gl.ARRAY_BUFFER, lr.vbo)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, lr.ebo)
gl.UseProgram(lr.shaderProgram)
// Loading up vertex attributes.
vertAttrib := uint32(gl.GetAttribLocation(lr.shaderProgram, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 2, gl.FLOAT, false, 2*4, gl.PtrOffset(0))
// Line thickness information.
gl.Uniform1f(
gl.GetUniformLocation(lr.shaderProgram, gl.Str("in_thickness\x00")),
lr.weight)
// Fragment shader color information.
gl.Uniform4f(
gl.GetUniformLocation(lr.shaderProgram, gl.Str("in_color\x00")),
lr.color.Red,
lr.color.Green,
lr.color.Blue,
lr.color.Alpha)
gl.BindFragDataLocation(lr.shaderProgram, 0, gl.Str("out_color\x00"))
// Performing the render.
gl.DrawElements(gl.LINE_STRIP, lr.points, gl.UNSIGNED_INT, nil)
}
func SetUniform4F(shader, variable string, vs []float32) error {
prog, ok := shader_progs[shader]
if !ok {
return fmt.Errorf("Tried to set a uniform in an unknown shader '%s'", shader)
}
bvariable := []byte(fmt.Sprintf("%s\x00", variable))
loc := gl.GetUniformLocation(prog, (*uint8)(unsafe.Pointer(&bvariable[0])))
gl.Uniform4f(loc, vs[0], vs[1], vs[2], vs[3])
return nil
}
func (r *Framerate) Render(camera *core.Camera) (err error) {
r.data.Sample()
var (
modelView = mgl32.Ident4()
dataBytes int = int(r.data.Count) * int(r.stride)
)
gl.Uniform4f(r.locColor, 255.0/255.0, 0, 0, 255.0/255.0)
gl.UniformMatrix4fv(r.locModelView, 1, false, &modelView[0])
gl.UniformMatrix4fv(r.locProjection, 1, false, &camera.Projection[0])
if dataBytes > r.vboBytes {
r.vboBytes = dataBytes
gl.BufferData(gl.ARRAY_BUFFER, dataBytes, gl.Ptr(r.data.Points), gl.STREAM_DRAW)
} else {
gl.BufferSubData(gl.ARRAY_BUFFER, 0, dataBytes, gl.Ptr(r.data.Points))
}
gl.DrawArrays(gl.POINTS, 0, r.data.Count)
if e := gl.GetError(); e != 0 {
err = fmt.Errorf("ERROR: OpenGL error %X", e)
}
return
}
func (r *Renderable) Draw(perspective mgl.Mat4, view mgl.Mat4) {
gl.UseProgram(r.Shader)
gl.BindVertexArray(r.Vao)
model := r.GetTransformMat4()
var mvp mgl.Mat4
shaderMvp := getUniformLocation(r.Shader, "MVP_MATRIX")
if shaderMvp >= 0 {
mvp = perspective.Mul4(view).Mul4(model)
gl.UniformMatrix4fv(shaderMvp, 1, false, &mvp[0])
}
shaderMv := getUniformLocation(r.Shader, "MV_MATRIX")
if shaderMv >= 0 {
mv := view.Mul4(model)
gl.UniformMatrix4fv(shaderMv, 1, false, &mv[0])
}
shaderTex0 := getUniformLocation(r.Shader, "DIFFUSE_TEX")
if shaderTex0 >= 0 {
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, r.Tex0)
gl.Uniform1i(shaderTex0, 0)
}
shaderColor := getUniformLocation(r.Shader, "MATERIAL_DIFFUSE")
if shaderColor >= 0 {
gl.Uniform4f(shaderColor, r.Color[0], r.Color[1], r.Color[2], r.Color[3])
}
shaderTex1 := getUniformLocation(r.Shader, "MATERIAL_TEX_0")
if shaderTex1 >= 0 {
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, r.Tex0)
gl.Uniform1i(shaderTex1, 0)
}
shaderCameraWorldPos := getUniformLocation(r.Shader, "CAMERA_WORLD_POSITION")
if shaderCameraWorldPos >= 0 {
gl.Uniform3f(shaderCameraWorldPos, -view[12], -view[13], -view[14])
}
shaderPosition := getAttribLocation(r.Shader, "VERTEX_POSITION")
if shaderPosition >= 0 {
gl.BindBuffer(gl.ARRAY_BUFFER, r.VertVBO)
gl.EnableVertexAttribArray(uint32(shaderPosition))
gl.VertexAttribPointer(uint32(shaderPosition), 3, gl.FLOAT, false, 0, gl.PtrOffset(0))
}
shaderNormal := getAttribLocation(r.Shader, "VERTEX_NORMAL")
if shaderNormal >= 0 {
gl.BindBuffer(gl.ARRAY_BUFFER, r.NormsVBO)
gl.EnableVertexAttribArray(uint32(shaderNormal))
gl.VertexAttribPointer(uint32(shaderNormal), 3, gl.FLOAT, false, 0, gl.PtrOffset(0))
}
shaderVertUv := getAttribLocation(r.Shader, "VERTEX_UV_0")
if shaderVertUv >= 0 {
gl.BindBuffer(gl.ARRAY_BUFFER, r.UvVBO)
gl.EnableVertexAttribArray(uint32(shaderVertUv))
gl.VertexAttribPointer(uint32(shaderVertUv), 2, gl.FLOAT, false, 0, gl.PtrOffset(0))
}
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, r.ElementsVBO)
gl.DrawElements(gl.TRIANGLES, int32(r.FaceCount*3), gl.UNSIGNED_INT, gl.PtrOffset(0))
gl.BindVertexArray(0)
}