mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2025-10-31 11:46:23 +08:00
344 lines
9.4 KiB
Go
344 lines
9.4 KiB
Go
// Copyright 2014 Hajime Hoshi
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package opengl
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/hajimehoshi/ebiten/internal/affine"
|
|
"github.com/hajimehoshi/ebiten/internal/driver"
|
|
"github.com/hajimehoshi/ebiten/internal/graphics"
|
|
"github.com/hajimehoshi/ebiten/internal/web"
|
|
)
|
|
|
|
// arrayBufferLayoutPart is a part of an array buffer layout.
|
|
type arrayBufferLayoutPart struct {
|
|
// TODO: This struct should belong to a program and know it.
|
|
name string
|
|
num int
|
|
}
|
|
|
|
// arrayBufferLayout is an array buffer layout.
|
|
//
|
|
// An array buffer in OpenGL is a buffer representing vertices and
|
|
// is passed to a vertex shader.
|
|
type arrayBufferLayout struct {
|
|
parts []arrayBufferLayoutPart
|
|
total int
|
|
}
|
|
|
|
func (a *arrayBufferLayout) names() []string {
|
|
ns := make([]string, len(a.parts))
|
|
for i, p := range a.parts {
|
|
ns[i] = p.name
|
|
}
|
|
return ns
|
|
}
|
|
|
|
// totalBytes returns the size in bytes for one element of the array buffer.
|
|
func (a *arrayBufferLayout) totalBytes() int {
|
|
if a.total != 0 {
|
|
return a.total
|
|
}
|
|
t := 0
|
|
for _, p := range a.parts {
|
|
t += float.SizeInBytes() * p.num
|
|
}
|
|
a.total = t
|
|
return a.total
|
|
}
|
|
|
|
// newArrayBuffer creates OpenGL's buffer object for the array buffer.
|
|
func (a *arrayBufferLayout) newArrayBuffer(context *context) buffer {
|
|
return context.newArrayBuffer(a.totalBytes() * graphics.IndicesNum)
|
|
}
|
|
|
|
// enable binds the array buffer the given program to use the array buffer.
|
|
func (a *arrayBufferLayout) enable(context *context, program program) {
|
|
for i := range a.parts {
|
|
context.enableVertexAttribArray(program, i)
|
|
}
|
|
total := a.totalBytes()
|
|
offset := 0
|
|
for i, p := range a.parts {
|
|
context.vertexAttribPointer(program, i, p.num, float, total, offset)
|
|
offset += float.SizeInBytes() * p.num
|
|
}
|
|
}
|
|
|
|
// disable stops using the array buffer.
|
|
func (a *arrayBufferLayout) disable(context *context, program program) {
|
|
// TODO: Disabling should be done in reversed order?
|
|
for i := range a.parts {
|
|
context.disableVertexAttribArray(program, i)
|
|
}
|
|
}
|
|
|
|
// theArrayBufferLayout is the array buffer layout for Ebiten.
|
|
var theArrayBufferLayout = arrayBufferLayout{
|
|
// Note that GL_MAX_VERTEX_ATTRIBS is at least 16.
|
|
parts: []arrayBufferLayoutPart{
|
|
{
|
|
name: "vertex",
|
|
num: 2,
|
|
},
|
|
{
|
|
name: "tex",
|
|
num: 2,
|
|
},
|
|
{
|
|
name: "tex_region",
|
|
num: 4,
|
|
},
|
|
{
|
|
name: "color_scale",
|
|
num: 4,
|
|
},
|
|
},
|
|
}
|
|
|
|
func init() {
|
|
vertexFloatNum := theArrayBufferLayout.totalBytes() / float.SizeInBytes()
|
|
if graphics.VertexFloatNum != vertexFloatNum {
|
|
panic(fmt.Sprintf("vertex float num must be %d but %d", graphics.VertexFloatNum, vertexFloatNum))
|
|
}
|
|
}
|
|
|
|
type programKey struct {
|
|
useColorM bool
|
|
filter driver.Filter
|
|
address driver.Address
|
|
}
|
|
|
|
// openGLState is a state for
|
|
type openGLState struct {
|
|
// arrayBuffer is OpenGL's array buffer (vertices data).
|
|
arrayBuffer buffer
|
|
|
|
// elementArrayBuffer is OpenGL's element array buffer (indices data).
|
|
elementArrayBuffer buffer
|
|
|
|
// programs is OpenGL's program for rendering a texture.
|
|
programs map[programKey]program
|
|
|
|
lastProgram program
|
|
lastViewportWidth int
|
|
lastViewportHeight int
|
|
lastColorMatrix []float32
|
|
lastColorMatrixTranslation []float32
|
|
lastSourceWidth int
|
|
lastSourceHeight int
|
|
lastFilter *driver.Filter
|
|
lastAddress *driver.Address
|
|
|
|
source *Image
|
|
destination *Image
|
|
}
|
|
|
|
var (
|
|
zeroBuffer buffer
|
|
zeroProgram program
|
|
)
|
|
|
|
// reset resets or initializes the OpenGL state.
|
|
func (s *openGLState) reset(context *context) error {
|
|
if err := context.reset(); err != nil {
|
|
return err
|
|
}
|
|
|
|
s.lastProgram = zeroProgram
|
|
s.lastViewportWidth = 0
|
|
s.lastViewportHeight = 0
|
|
s.lastColorMatrix = nil
|
|
s.lastColorMatrixTranslation = nil
|
|
s.lastSourceWidth = 0
|
|
s.lastSourceHeight = 0
|
|
s.lastFilter = nil
|
|
s.lastAddress = nil
|
|
|
|
// When context lost happens, deleting programs or buffers is not necessary.
|
|
// However, it is not assumed that reset is called only when context lost happens.
|
|
// Let's delete them explicitly.
|
|
if s.programs == nil {
|
|
s.programs = map[programKey]program{}
|
|
} else {
|
|
for k, p := range s.programs {
|
|
context.deleteProgram(p)
|
|
delete(s.programs, k)
|
|
}
|
|
}
|
|
|
|
// On browsers (at least Chrome), buffers are already detached from the context
|
|
// and must not be deleted by DeleteBuffer.
|
|
if !web.IsBrowser() {
|
|
if !s.arrayBuffer.equal(zeroBuffer) {
|
|
context.deleteBuffer(s.arrayBuffer)
|
|
}
|
|
if !s.elementArrayBuffer.equal(zeroBuffer) {
|
|
context.deleteBuffer(s.elementArrayBuffer)
|
|
}
|
|
}
|
|
|
|
shaderVertexModelviewNative, err := context.newShader(vertexShader, vertexShaderStr())
|
|
if err != nil {
|
|
panic(fmt.Sprintf("graphics: shader compiling error:\n%s", err))
|
|
}
|
|
defer context.deleteShader(shaderVertexModelviewNative)
|
|
|
|
for _, c := range []bool{false, true} {
|
|
for _, a := range []driver.Address{
|
|
driver.AddressClampToZero,
|
|
driver.AddressRepeat,
|
|
} {
|
|
for _, f := range []driver.Filter{
|
|
driver.FilterNearest,
|
|
driver.FilterLinear,
|
|
driver.FilterScreen,
|
|
} {
|
|
shaderFragmentColorMatrixNative, err := context.newShader(fragmentShader, fragmentShaderStr(c, f, a))
|
|
if err != nil {
|
|
panic(fmt.Sprintf("graphics: shader compiling error:\n%s", err))
|
|
}
|
|
defer context.deleteShader(shaderFragmentColorMatrixNative)
|
|
|
|
program, err := context.newProgram([]shader{
|
|
shaderVertexModelviewNative,
|
|
shaderFragmentColorMatrixNative,
|
|
}, theArrayBufferLayout.names())
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
s.programs[programKey{
|
|
useColorM: c,
|
|
filter: f,
|
|
address: a,
|
|
}] = program
|
|
}
|
|
}
|
|
}
|
|
|
|
s.arrayBuffer = theArrayBufferLayout.newArrayBuffer(context)
|
|
|
|
// Note that the indices passed to NewElementArrayBuffer is not under GC management
|
|
// in opengl package due to unsafe-way.
|
|
// See NewElementArrayBuffer in context_mobile.go.
|
|
s.elementArrayBuffer = context.newElementArrayBuffer(graphics.IndicesNum * 2)
|
|
|
|
return nil
|
|
}
|
|
|
|
// areSameFloat32Array returns a boolean indicating if a and b are deeply equal.
|
|
func areSameFloat32Array(a, b []float32) bool {
|
|
if len(a) != len(b) {
|
|
return false
|
|
}
|
|
for i := 0; i < len(a); i++ {
|
|
if a[i] != b[i] {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// useProgram uses the program (programTexture).
|
|
func (d *Driver) useProgram(mode driver.CompositeMode, colorM *affine.ColorM, filter driver.Filter, address driver.Address) error {
|
|
destination := d.state.destination
|
|
if destination == nil {
|
|
panic("destination image is not set")
|
|
}
|
|
source := d.state.source
|
|
if source == nil {
|
|
panic("source image is not set")
|
|
}
|
|
|
|
if err := destination.setViewport(); err != nil {
|
|
return err
|
|
}
|
|
dstW := destination.width
|
|
srcW, srcH := source.width, source.height
|
|
|
|
d.context.blendFunc(mode)
|
|
|
|
program := d.state.programs[programKey{
|
|
useColorM: colorM != nil,
|
|
filter: filter,
|
|
address: address,
|
|
}]
|
|
if !d.state.lastProgram.equal(program) {
|
|
d.context.useProgram(program)
|
|
if d.state.lastProgram.equal(zeroProgram) {
|
|
theArrayBufferLayout.enable(&d.context, program)
|
|
d.context.bindBuffer(arrayBuffer, d.state.arrayBuffer)
|
|
d.context.bindBuffer(elementArrayBuffer, d.state.elementArrayBuffer)
|
|
d.context.uniformInt(program, "texture", 0)
|
|
}
|
|
|
|
d.state.lastProgram = program
|
|
d.state.lastViewportWidth = 0
|
|
d.state.lastViewportHeight = 0
|
|
d.state.lastColorMatrix = nil
|
|
d.state.lastColorMatrixTranslation = nil
|
|
d.state.lastSourceWidth = 0
|
|
d.state.lastSourceHeight = 0
|
|
}
|
|
|
|
vw := destination.framebuffer.width
|
|
vh := destination.framebuffer.height
|
|
if d.state.lastViewportWidth != vw || d.state.lastViewportHeight != vh {
|
|
d.context.uniformFloats(program, "viewport_size", []float32{float32(vw), float32(vh)})
|
|
d.state.lastViewportWidth = vw
|
|
d.state.lastViewportHeight = vh
|
|
}
|
|
|
|
if colorM != nil {
|
|
esBody, esTranslate := colorM.UnsafeElements()
|
|
if !areSameFloat32Array(d.state.lastColorMatrix, esBody) {
|
|
d.context.uniformFloats(program, "color_matrix_body", esBody)
|
|
// ColorM's elements are immutable. It's OK to hold the reference without copying.
|
|
d.state.lastColorMatrix = esBody
|
|
}
|
|
if !areSameFloat32Array(d.state.lastColorMatrixTranslation, esTranslate) {
|
|
d.context.uniformFloats(program, "color_matrix_translation", esTranslate)
|
|
// ColorM's elements are immutable. It's OK to hold the reference without copying.
|
|
d.state.lastColorMatrixTranslation = esTranslate
|
|
}
|
|
}
|
|
|
|
if filter != driver.FilterNearest {
|
|
sw := graphics.InternalImageSize(srcW)
|
|
sh := graphics.InternalImageSize(srcH)
|
|
if d.state.lastSourceWidth != sw || d.state.lastSourceHeight != sh {
|
|
d.context.uniformFloats(program, "source_size", []float32{float32(sw), float32(sh)})
|
|
d.state.lastSourceWidth = sw
|
|
d.state.lastSourceHeight = sh
|
|
}
|
|
}
|
|
|
|
if filter == driver.FilterScreen {
|
|
scale := float32(dstW) / float32(srcW)
|
|
d.context.uniformFloat(program, "scale", scale)
|
|
}
|
|
|
|
// We don't have to call gl.ActiveTexture here: GL_TEXTURE0 is the default active texture
|
|
// See also: https://www.opengl.org/sdk/docs/man2/xhtml/glActiveTexture.xml
|
|
d.context.bindTexture(source.textureNative)
|
|
|
|
d.state.source = nil
|
|
d.state.destination = nil
|
|
return nil
|
|
}
|