mirror of
https://github.com/hajimehoshi/ebiten.git
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67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
// Copyright 2014 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package opengl
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// Framebuffer is a wrapper of OpenGL's framebuffer.
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//
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// TODO: Create a new struct Image and embed this struct.
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type Framebuffer struct {
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native framebufferNative
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proMatrix []float32
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width int
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height int
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}
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// newFramebufferFromTexture creates a framebuffer from the given texture.
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func newFramebufferFromTexture(texture Texture, width, height int) (*Framebuffer, error) {
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native, err := theContext.newFramebuffer(texture)
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if err != nil {
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return nil, err
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}
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return &Framebuffer{
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native: native,
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width: width,
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height: height,
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}, nil
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}
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// newScreenFramebuffer creates a framebuffer for the screen.
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func newScreenFramebuffer(width, height int) *Framebuffer {
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return &Framebuffer{
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native: theContext.getScreenFramebuffer(),
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width: width,
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height: height,
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}
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}
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// projectionMatrix returns a projection matrix of the framebuffer.
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//
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// A projection matrix converts the coodinates on the framebuffer
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// (0, 0) - (viewport width, viewport height)
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// to the normalized device coodinates (-1, -1) - (1, 1) with adjustment.
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func (f *Framebuffer) projectionMatrix() []float32 {
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if f.proMatrix != nil {
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return f.proMatrix
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}
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f.proMatrix = orthoProjectionMatrix(0, f.width, 0, f.height)
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return f.proMatrix
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}
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func (f *Framebuffer) delete() {
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if f.native != theContext.getScreenFramebuffer() {
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theContext.deleteFramebuffer(f.native)
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}
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}
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