mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
273 lines
7.0 KiB
Go
273 lines
7.0 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 graphics
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
|
|
)
|
|
|
|
type arrayBufferLayoutPart struct {
|
|
// TODO: This struct should belong to a program and know it.
|
|
name string
|
|
dataType opengl.DataType
|
|
num int
|
|
normalize bool
|
|
}
|
|
|
|
type arrayBufferLayout struct {
|
|
parts []arrayBufferLayoutPart
|
|
total int
|
|
}
|
|
|
|
func (a *arrayBufferLayout) totalBytes() int {
|
|
if a.total != 0 {
|
|
return a.total
|
|
}
|
|
t := 0
|
|
for _, p := range a.parts {
|
|
t += p.dataType.SizeInBytes() * p.num
|
|
}
|
|
a.total = t
|
|
return a.total
|
|
}
|
|
|
|
func (a *arrayBufferLayout) newArrayBuffer(c *opengl.Context) opengl.Buffer {
|
|
return c.NewBuffer(opengl.ArrayBuffer, a.totalBytes()*4*maxQuads, opengl.DynamicDraw)
|
|
}
|
|
|
|
func (a *arrayBufferLayout) enable(c *opengl.Context, program opengl.Program) {
|
|
for _, p := range a.parts {
|
|
c.EnableVertexAttribArray(program, p.name)
|
|
}
|
|
total := a.totalBytes()
|
|
offset := 0
|
|
for _, p := range a.parts {
|
|
c.VertexAttribPointer(program, p.name, p.num, p.dataType, p.normalize, total, offset)
|
|
offset += p.dataType.SizeInBytes() * p.num
|
|
}
|
|
}
|
|
|
|
func (a *arrayBufferLayout) disable(c *opengl.Context, program opengl.Program) {
|
|
// TODO: Disabling should be done in reversed order?
|
|
for _, p := range a.parts {
|
|
c.DisableVertexAttribArray(program, p.name)
|
|
}
|
|
}
|
|
|
|
var (
|
|
theArrayBufferLayout = arrayBufferLayout{
|
|
// Note that GL_MAX_VERTEX_ATTRIBS is at least 16.
|
|
parts: []arrayBufferLayoutPart{
|
|
{
|
|
name: "vertex",
|
|
dataType: opengl.Short,
|
|
num: 2,
|
|
normalize: false,
|
|
},
|
|
{
|
|
name: "tex_coord",
|
|
dataType: opengl.Short,
|
|
num: 2,
|
|
normalize: true,
|
|
},
|
|
{
|
|
name: "geo_matrix_body",
|
|
dataType: opengl.Float,
|
|
num: 4,
|
|
normalize: false,
|
|
},
|
|
{
|
|
name: "geo_matrix_translation",
|
|
dataType: opengl.Float,
|
|
num: 2,
|
|
normalize: false,
|
|
},
|
|
},
|
|
}
|
|
)
|
|
|
|
type openGLState struct {
|
|
arrayBuffer opengl.Buffer
|
|
indexBufferQuads opengl.Buffer
|
|
programTexture opengl.Program
|
|
|
|
lastProgram opengl.Program
|
|
lastProjectionMatrix []float32
|
|
lastColorMatrix []float32
|
|
lastColorMatrixTranslation []float32
|
|
}
|
|
|
|
var (
|
|
theOpenGLState openGLState
|
|
|
|
zeroBuffer opengl.Buffer
|
|
zeroProgram opengl.Program
|
|
zeroTexture opengl.Texture
|
|
)
|
|
|
|
const (
|
|
indicesNum = 1 << 16
|
|
maxQuads = indicesNum / 6
|
|
)
|
|
|
|
func Reset(context *opengl.Context) error {
|
|
return theOpenGLState.reset(context)
|
|
}
|
|
|
|
func (s *openGLState) reset(context *opengl.Context) error {
|
|
if err := context.Reset(); err != nil {
|
|
return err
|
|
}
|
|
s.lastProgram = zeroProgram
|
|
s.lastProjectionMatrix = nil
|
|
s.lastColorMatrix = nil
|
|
s.lastColorMatrixTranslation = nil
|
|
|
|
if s.arrayBuffer != zeroBuffer {
|
|
context.DeleteBuffer(s.arrayBuffer)
|
|
}
|
|
if s.indexBufferQuads != zeroBuffer {
|
|
context.DeleteBuffer(s.indexBufferQuads)
|
|
}
|
|
if s.programTexture != zeroProgram {
|
|
context.DeleteProgram(s.programTexture)
|
|
}
|
|
|
|
shaderVertexModelviewNative, err := context.NewShader(opengl.VertexShader, shader(context, shaderVertexModelview))
|
|
if err != nil {
|
|
panic(fmt.Sprintf("graphics: shader compiling error:\n%s", err))
|
|
}
|
|
defer context.DeleteShader(shaderVertexModelviewNative)
|
|
|
|
shaderFragmentTextureNative, err := context.NewShader(opengl.FragmentShader, shader(context, shaderFragmentTexture))
|
|
if err != nil {
|
|
panic(fmt.Sprintf("graphics: shader compiling error:\n%s", err))
|
|
}
|
|
defer context.DeleteShader(shaderFragmentTextureNative)
|
|
|
|
s.programTexture, err = context.NewProgram([]opengl.Shader{
|
|
shaderVertexModelviewNative,
|
|
shaderFragmentTextureNative,
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
s.arrayBuffer = theArrayBufferLayout.newArrayBuffer(context)
|
|
|
|
indices := make([]uint16, 6*maxQuads)
|
|
for i := uint16(0); i < maxQuads; i++ {
|
|
indices[6*i+0] = 4*i + 0
|
|
indices[6*i+1] = 4*i + 1
|
|
indices[6*i+2] = 4*i + 2
|
|
indices[6*i+3] = 4*i + 1
|
|
indices[6*i+4] = 4*i + 2
|
|
indices[6*i+5] = 4*i + 3
|
|
}
|
|
s.indexBufferQuads = context.NewBuffer(opengl.ElementArrayBuffer, indices, opengl.StaticDraw)
|
|
|
|
return nil
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
type programContext struct {
|
|
state *openGLState
|
|
program opengl.Program
|
|
context *opengl.Context
|
|
projectionMatrix []float32
|
|
texture opengl.Texture
|
|
colorM Matrix
|
|
}
|
|
|
|
func (p *programContext) begin() error {
|
|
c := p.context
|
|
if p.state.lastProgram != p.program {
|
|
c.UseProgram(p.program)
|
|
if p.state.lastProgram != zeroProgram {
|
|
theArrayBufferLayout.disable(c, p.state.lastProgram)
|
|
}
|
|
theArrayBufferLayout.enable(c, p.program)
|
|
|
|
p.state.lastProgram = p.state.programTexture
|
|
p.state.lastProjectionMatrix = nil
|
|
p.state.lastColorMatrix = nil
|
|
p.state.lastColorMatrixTranslation = nil
|
|
c.BindElementArrayBuffer(p.state.indexBufferQuads)
|
|
c.UniformInt(p.program, "texture", 0)
|
|
}
|
|
|
|
if !areSameFloat32Array(p.state.lastProjectionMatrix, p.projectionMatrix) {
|
|
c.UniformFloats(p.program, "projection_matrix", p.projectionMatrix)
|
|
if p.state.lastProjectionMatrix == nil {
|
|
p.state.lastProjectionMatrix = make([]float32, 16)
|
|
}
|
|
copy(p.state.lastProjectionMatrix, p.projectionMatrix)
|
|
}
|
|
|
|
e := [4][5]float32{}
|
|
for i := 0; i < 4; i++ {
|
|
for j := 0; j < 5; j++ {
|
|
e[i][j] = float32(p.colorM.Element(i, j))
|
|
}
|
|
}
|
|
|
|
colorMatrix := []float32{
|
|
e[0][0], e[1][0], e[2][0], e[3][0],
|
|
e[0][1], e[1][1], e[2][1], e[3][1],
|
|
e[0][2], e[1][2], e[2][2], e[3][2],
|
|
e[0][3], e[1][3], e[2][3], e[3][3],
|
|
}
|
|
if !areSameFloat32Array(p.state.lastColorMatrix, colorMatrix) {
|
|
c.UniformFloats(p.program, "color_matrix", colorMatrix)
|
|
if p.state.lastColorMatrix == nil {
|
|
p.state.lastColorMatrix = make([]float32, 16)
|
|
}
|
|
copy(p.state.lastColorMatrix, colorMatrix)
|
|
}
|
|
colorMatrixTranslation := []float32{
|
|
e[0][4], e[1][4], e[2][4], e[3][4],
|
|
}
|
|
if !areSameFloat32Array(p.state.lastColorMatrixTranslation, colorMatrixTranslation) {
|
|
c.UniformFloats(p.program, "color_matrix_translation", colorMatrixTranslation)
|
|
if p.state.lastColorMatrixTranslation == nil {
|
|
p.state.lastColorMatrixTranslation = make([]float32, 4)
|
|
}
|
|
copy(p.state.lastColorMatrixTranslation, colorMatrixTranslation)
|
|
}
|
|
|
|
// 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
|
|
if err := c.BindTexture(p.texture); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (p *programContext) end() {
|
|
}
|