func (t *Text) Draw() {
if t.IsDebug {
t.BoundingBox.Draw()
}
gl.UseProgram(t.font.program)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, t.font.textureID)
// uniforms
gl.Uniform1i(t.font.fragmentTextureUniform, 0)
gl.Uniform4fv(t.font.colorUniform, 1, &t.color[0])
gl.Uniform2fv(t.font.finalPositionUniform, 1, &t.finalPosition[0])
gl.UniformMatrix4fv(t.font.orthographicMatrixUniform, 1, false, &t.font.OrthographicMatrix[0])
gl.UniformMatrix4fv(t.font.scaleMatrixUniform, 1, false, &t.scaleMatrix[0])
// draw
drawCount := int32(t.RuneCount * 6)
if drawCount > int32(t.eboIndexCount) {
drawCount = int32(t.eboIndexCount)
}
if drawCount < 0 {
drawCount = 0
}
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.BindVertexArray(t.vao)
gl.DrawElements(gl.TRIANGLES, drawCount, gl.UNSIGNED_INT, nil)
gl.BindVertexArray(0)
gl.Disable(gl.BLEND)
}
func (c Context) DrawRectangle(x, y, w, h float32, color Color) {
gl.UseProgram(c.program)
model := mgl32.Translate3D(x, y, 0).Mul4(mgl32.Scale3D(w, h, 0))
modelUniform := gl.GetUniformLocation(c.program, gl.Str("model\x00"))
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
colorArray := []float32{color.B, color.G, color.R}
colorUniform := gl.GetUniformLocation(c.program, gl.Str("color\x00"))
gl.Uniform4fv(colorUniform, 1, &colorArray[0])
gl.DrawArrays(gl.TRIANGLES, 0, 6)
}