mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
105 lines
2.5 KiB
Go
105 lines
2.5 KiB
Go
// Copyright 2016 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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"image/color"
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"math"
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"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
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)
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type command interface {
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Exec(context *opengl.Context) error
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}
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type commandQueue struct {
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commands []command
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}
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var theCommandQueue = &commandQueue{
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commands: []command{},
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}
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func (q *commandQueue) Enqueue(command command) {
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q.commands = append(q.commands, command)
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}
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func (q *commandQueue) Exec(context *opengl.Context) error {
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// TODO: Do optimizing before executing
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for _, c := range q.commands {
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if err := c.Exec(context); err != nil {
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return err
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}
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}
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q.commands = []command{}
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return nil
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}
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type fillCommand struct {
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dst *Framebuffer
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color color.Color
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}
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func (c *fillCommand) Exec(context *opengl.Context) error {
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if err := c.dst.setAsViewport(context); err != nil {
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return err
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}
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cr, cg, cb, ca := c.color.RGBA()
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const max = math.MaxUint16
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r := float64(cr) / max
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g := float64(cg) / max
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b := float64(cb) / max
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a := float64(ca) / max
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return context.FillFramebuffer(r, g, b, a)
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}
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type drawImageCommand struct {
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dst *Framebuffer
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src *Texture
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vertices []int16
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geo Matrix
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color Matrix
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mode opengl.CompositeMode
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}
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func (c *drawImageCommand) Exec(context *opengl.Context) error {
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if err := c.dst.setAsViewport(context); err != nil {
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return err
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}
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p := c.dst.projectionMatrix()
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return drawTexture(context, c.src.native, p, c.vertices, c.geo, c.color, c.mode)
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}
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type replacePixelsCommand struct {
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dst *Framebuffer
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texture *Texture
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pixels []uint8
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}
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func (c *replacePixelsCommand) Exec(context *opengl.Context) error {
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// Filling with non black or white color is required here for glTexSubImage2D.
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// Very mysterious but this actually works (Issue #186)
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if err := c.dst.setAsViewport(context); err != nil {
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return err
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}
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if err := context.FillFramebuffer(0, 0, 0.5, 1); err != nil {
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return err
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}
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context.BindTexture(c.texture.native)
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context.TexSubImage2D(c.pixels, c.texture.width, c.texture.height)
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return nil
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}
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