mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 19:58:54 +01:00
116 lines
3.0 KiB
Go
116 lines
3.0 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 graphics
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import (
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"github.com/hajimehoshi/ebiten/internal"
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"github.com/hajimehoshi/ebiten/internal/graphics/internal/shader"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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)
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func orthoProjectionMatrix(left, right, bottom, top int) *[4][4]float64 {
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e11 := float64(2) / float64(right-left)
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e22 := float64(2) / float64(top-bottom)
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e14 := -1 * float64(right+left) / float64(right-left)
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e24 := -1 * float64(top+bottom) / float64(top-bottom)
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return &[4][4]float64{
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{e11, 0, 0, e14},
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{0, e22, 0, e24},
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{0, 0, 1, 0},
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{0, 0, 0, 1},
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}
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}
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type Framebuffer struct {
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native opengl.Framebuffer
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width int
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height int
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flipY bool
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}
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func NewZeroFramebuffer(c *opengl.Context, width, height int) (*Framebuffer, error) {
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r := &Framebuffer{
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width: width,
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height: height,
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flipY: true,
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}
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return r, nil
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}
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func NewFramebufferFromTexture(c *opengl.Context, texture *Texture) (*Framebuffer, error) {
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f, err := c.NewFramebuffer(opengl.Texture(texture.native))
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if err != nil {
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return nil, err
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}
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w, h := texture.Size()
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return &Framebuffer{
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native: f,
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width: w,
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height: h,
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}, nil
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}
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func (f *Framebuffer) Size() (width, height int) {
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return f.width, f.height
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}
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func (f *Framebuffer) Dispose(c *opengl.Context) {
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c.DeleteFramebuffer(f.native)
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}
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func (f *Framebuffer) setAsViewport(c *opengl.Context) error {
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width := internal.NextPowerOf2Int(f.width)
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height := internal.NextPowerOf2Int(f.height)
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return c.SetViewport(f.native, width, height)
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}
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func (f *Framebuffer) projectionMatrix() *[4][4]float64 {
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width := internal.NextPowerOf2Int(f.width)
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height := internal.NextPowerOf2Int(f.height)
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m := orthoProjectionMatrix(0, width, 0, height)
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if f.flipY {
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m[1][1] *= -1
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m[1][3] += float64(f.height) / float64(internal.NextPowerOf2Int(f.height)) * 2
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}
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return m
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}
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type Matrix interface {
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Element(i, j int) float64
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}
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type TextureQuads interface {
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Len() int
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Vertex(i int) (x0, y0, x1, y1 float32)
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Texture(i int) (u0, v0, u1, v1 float32)
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}
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func (f *Framebuffer) Fill(c *opengl.Context, r, g, b, a float64) error {
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if err := f.setAsViewport(c); err != nil {
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return err
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}
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return c.FillFramebuffer(f.native, r, g, b, a)
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}
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func (f *Framebuffer) DrawTexture(c *opengl.Context, t *Texture, quads TextureQuads, geo, clr Matrix) error {
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if err := f.setAsViewport(c); err != nil {
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return err
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}
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projectionMatrix := f.projectionMatrix()
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// TODO: Define texture.Draw()
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return shader.DrawTexture(c, t.native, projectionMatrix, quads, geo, clr)
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}
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