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graphics: Reduce calls of glBindTexture

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This commit is contained in:
Hajime Hoshi 2016-06-05 01:55:28 +09:00
parent 4812f2e76e
commit 4c2650c721
1 changed files with 12 additions and 4 deletions
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16
internal/graphics/program.go
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@ -29,9 +29,14 @@ type openGLState struct {
lastModelviewMatrix []float32
lastColorMatrix []float32
lastColorMatrixTranslation []float32
lastTexture opengl.Texture
}
var theOpenGLState openGLState
var (
zeroProgram opengl.Program
zeroTexture opengl.Texture
)
const (
indicesNum = 1 << 16
@ -53,12 +58,12 @@ func Finalize(c *opengl.Context) error {
}
func (s *openGLState) initialize(c *opengl.Context) error {
var zeroProgram opengl.Program
s.lastProgram = zeroProgram
s.lastProjectionMatrix = nil
s.lastModelviewMatrix = nil
s.lastColorMatrix = nil
s.lastColorMatrixTranslation = nil
s.lastTexture = zeroTexture
shaderVertexModelviewNative, err := c.NewShader(c.VertexShader, shader(c, shaderVertexModelview))
if err != nil {
@ -98,12 +103,12 @@ func (s *openGLState) initialize(c *opengl.Context) error {
}
func (s *openGLState) finalize(c *opengl.Context) error {
var zeroProgram opengl.Program
s.lastProgram = zeroProgram
s.lastProjectionMatrix = nil
s.lastModelviewMatrix = nil
s.lastColorMatrix = nil
s.lastColorMatrixTranslation = nil
s.lastTexture = zeroTexture
c.DeleteBuffer(s.indexBufferQuads)
c.DeleteProgram(s.programTexture)
return nil
@ -135,7 +140,6 @@ func (p *programContext) begin() {
c := p.context
if p.state.lastProgram != p.program {
c.UseProgram(p.program)
var zeroProgram opengl.Program
if p.state.lastProgram != zeroProgram {
c.DisableVertexAttribArray(p.state.lastProgram, "tex_coord")
c.DisableVertexAttribArray(p.state.lastProgram, "vertex")
@ -150,6 +154,7 @@ func (p *programContext) begin() {
p.state.lastModelviewMatrix = nil
p.state.lastColorMatrix = nil
p.state.lastColorMatrixTranslation = nil
p.state.lastTexture = zeroTexture
c.BindElementArrayBuffer(p.state.indexBufferQuads)
c.UniformInt(p.program, "texture", 0)
}
@ -215,7 +220,10 @@ func (p *programContext) begin() {
// 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
c.BindTexture(p.texture)
if p.state.lastTexture != p.texture {
c.BindTexture(p.texture)
p.state.lastTexture = p.texture
}
}
func (p *programContext) end() {