ebiten/internal/graphicsdriver/opengl/program.go

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// 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.
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package opengl
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import (
"fmt"
"strconv"
"strings"
"github.com/hajimehoshi/ebiten/internal/driver"
"github.com/hajimehoshi/ebiten/internal/graphics"
"github.com/hajimehoshi/ebiten/internal/web"
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)
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// arrayBufferLayoutPart is a part of an array buffer layout.
type arrayBufferLayoutPart struct {
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// TODO: This struct should belong to a program and know it.
name string
num int
}
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// 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
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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
}
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// totalBytes returns the size in bytes for one element of the array buffer.
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func (a *arrayBufferLayout) totalBytes() int {
if a.total != 0 {
return a.total
}
t := 0
for _, p := range a.parts {
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t += float.SizeInBytes() * p.num
}
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a.total = t
return a.total
}
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// newArrayBuffer creates OpenGL's buffer object for the array buffer.
func (a *arrayBufferLayout) newArrayBuffer(context *context) buffer {
return context.newArrayBuffer(a.totalBytes() * graphics.IndicesNum)
}
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// 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)
}
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total := a.totalBytes()
offset := 0
for i, p := range a.parts {
context.vertexAttribPointer(program, i, p.num, float, total, offset)
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offset += float.SizeInBytes() * p.num
}
}
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// 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,
},
},
}
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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
}
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// openGLState is a state for
type openGLState struct {
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// arrayBuffer is OpenGL's array buffer (vertices data).
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arrayBuffer buffer
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// elementArrayBuffer is OpenGL's element array buffer (indices data).
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elementArrayBuffer buffer
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// programs is OpenGL's program for rendering a texture.
programs map[programKey]program
lastProgram program
lastUniforms map[string]interface{}
lastActiveTexture int
}
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var (
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zeroBuffer buffer
zeroProgram program
)
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// reset resets or initializes the OpenGL state.
func (s *openGLState) reset(context *context) error {
if err := context.reset(); err != nil {
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return err
}
s.lastProgram = zeroProgram
s.lastUniforms = map[string]interface{}{}
// 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())
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if err != nil {
panic(fmt.Sprintf("graphics: shader compiling error:\n%s", err))
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}
defer context.deleteShader(shaderVertexModelviewNative)
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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)
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// 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)
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return nil
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}
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// 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 (g *Graphics) useProgram(program program, uniforms map[string]interface{}) error {
if !g.state.lastProgram.equal(program) {
g.context.useProgram(program)
if g.state.lastProgram.equal(zeroProgram) {
theArrayBufferLayout.enable(&g.context, program)
g.context.bindBuffer(arrayBuffer, g.state.arrayBuffer)
g.context.bindBuffer(elementArrayBuffer, g.state.elementArrayBuffer)
}
g.state.lastProgram = program
g.state.lastUniforms = map[string]interface{}{}
g.state.lastActiveTexture = 0
g.context.activeTexture(0)
}
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for key, u := range uniforms {
switch u := u.(type) {
case float32:
cached, ok := g.state.lastUniforms[key].(float32)
if ok && cached == u {
continue
}
g.context.uniformFloat(program, key, u)
g.state.lastUniforms[key] = u
case []float32:
cached, ok := g.state.lastUniforms[key].([]float32)
if ok && areSameFloat32Array(cached, u) {
continue
}
g.context.uniformFloats(program, key, u)
g.state.lastUniforms[key] = u
case textureNative:
// Apparently, a texture must be bound every time. The cache is not used here.
tokens := strings.SplitN(key, "/", 2)
if len(tokens) != 2 {
return fmt.Errorf("opengl: a uniform variable name for textures must be '[name]/[index]' but %s", key)
}
idx, err := strconv.Atoi(tokens[1])
if err != nil {
return fmt.Errorf("opengl: a uniform variable name for textures must be '[name]/[index]' but %s", key)
}
g.context.uniformInt(program, tokens[0], idx)
if g.state.lastActiveTexture != idx {
g.context.activeTexture(idx)
g.state.lastActiveTexture = idx
}
g.context.bindTexture(u)
}
}
return nil
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}