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graphicsdriver/opengl: Use glBindAttribLocation instead of glGetAttribLocation

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Attribute variables are often optimized out and it is really hard
to prevent this.

Instead of implicit indices of attribute variables, use explicit
indices by glBindAttribLocation.

Bug: #816
This commit is contained in:
Hajime Hoshi 2019-02-16 14:03:21 +09:00
parent 7ff99d3965
commit 09ca873c41
6 changed files with 55 additions and 80 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
internal/graphicsdriver/opengl/context_desktop.go
View File

@ -311,7 +311,7 @@ func (c *context) deleteShader(s shader) {
})
}
func (c *context) newProgram(shaders []shader) (program, error) {
func (c *context) newProgram(shaders []shader, attributes []string) (program, error) {
var pr program
if err := mainthread.Run(func() error {
p := gl.CreateProgram()
@ -322,6 +322,13 @@ func (c *context) newProgram(shaders []shader) (program, error) {
for _, shader := range shaders {
gl.AttachShader(p, uint32(shader))
}
for i, name := range attributes {
l, free := gl.Strs(name + "\x00")
gl.BindAttribLocation(p, uint32(i), *l)
free()
}
gl.LinkProgram(p)
var v int32
gl.GetProgramiv(p, gl.LINK_STATUS, &v)
@ -396,36 +403,23 @@ func (c *context) uniformFloats(p program, location string, v []float32) {
})
}
func (c *context) getAttribLocationImpl(p program, location string) attribLocation {
l, free := gl.Strs(location + "\x00")
attrib := attribLocation(gl.GetAttribLocation(uint32(p), *l))
free()
if attrib == -1 {
panic("opengl: invalid attrib location: " + location)
}
return attrib
}
func (c *context) vertexAttribPointer(p program, location string, size int, dataType dataType, stride int, offset int) {
func (c *context) vertexAttribPointer(p program, index int, size int, dataType dataType, stride int, offset int) {
_ = mainthread.Run(func() error {
l := c.locationCache.GetAttribLocation(c, p, location)
gl.VertexAttribPointer(uint32(l), int32(size), uint32(dataType), false, int32(stride), gl.PtrOffset(offset))
gl.VertexAttribPointer(uint32(index), int32(size), uint32(dataType), false, int32(stride), gl.PtrOffset(offset))
return nil
})
}
func (c *context) enableVertexAttribArray(p program, location string) {
func (c *context) enableVertexAttribArray(p program, index int) {
_ = mainthread.Run(func() error {
l := c.locationCache.GetAttribLocation(c, p, location)
gl.EnableVertexAttribArray(uint32(l))
gl.EnableVertexAttribArray(uint32(index))
return nil
})
}
func (c *context) disableVertexAttribArray(p program, location string) {
func (c *context) disableVertexAttribArray(p program, index int) {
_ = mainthread.Run(func() error {
l := c.locationCache.GetAttribLocation(c, p, location)
gl.DisableVertexAttribArray(uint32(l))
gl.DisableVertexAttribArray(uint32(index))
return nil
})
}

28
internal/graphicsdriver/opengl/context_js.go
View File

@ -293,7 +293,7 @@ func (c *context) deleteShader(s shader) {
gl.Call("deleteShader", js.Value(s))
}
func (c *context) newProgram(shaders []shader) (program, error) {
func (c *context) newProgram(shaders []shader, attributes []string) (program, error) {
c.ensureGL()
gl := c.gl
v := gl.Call("createProgram")
@ -304,6 +304,11 @@ func (c *context) newProgram(shaders []shader) (program, error) {
for _, shader := range shaders {
gl.Call("attachShader", v, js.Value(shader))
}
for i, name := range attributes {
gl.Call("bindAttribLocation", v, i, name)
}
gl.Call("linkProgram", v)
if !gl.Call("getProgramParameter", v, linkStatus).Bool() {
return program{}, errors.New("opengl: program error")
@ -374,31 +379,22 @@ func (c *context) uniformFloats(p program, location string, v []float32) {
}
}
func (c *context) getAttribLocationImpl(p program, location string) attribLocation {
func (c *context) vertexAttribPointer(p program, index int, size int, dataType dataType, stride int, offset int) {
c.ensureGL()
gl := c.gl
return attribLocation(gl.Call("getAttribLocation", p.value, location).Int())
gl.Call("vertexAttribPointer", index, size, int(dataType), false, stride, offset)
}
func (c *context) vertexAttribPointer(p program, location string, size int, dataType dataType, stride int, offset int) {
func (c *context) enableVertexAttribArray(p program, index int) {
c.ensureGL()
gl := c.gl
l := c.locationCache.GetAttribLocation(c, p, location)
gl.Call("vertexAttribPointer", int(l), size, int(dataType), false, stride, offset)
gl.Call("enableVertexAttribArray", index)
}
func (c *context) enableVertexAttribArray(p program, location string) {
func (c *context) disableVertexAttribArray(p program, index int) {
c.ensureGL()
gl := c.gl
l := c.locationCache.GetAttribLocation(c, p, location)
gl.Call("enableVertexAttribArray", int(l))
}
func (c *context) disableVertexAttribArray(p program, location string) {
c.ensureGL()
gl := c.gl
l := c.locationCache.GetAttribLocation(c, p, location)
gl.Call("disableVertexAttribArray", int(l))
gl.Call("disableVertexAttribArray", index)
}
func (c *context) newArrayBuffer(size int) buffer {

31
internal/graphicsdriver/opengl/context_mobile.go
View File

@ -243,7 +243,7 @@ func (c *context) deleteShader(s shader) {
gl.DeleteShader(mgl.Shader(s))
}
func (c *context) newProgram(shaders []shader) (program, error) {
func (c *context) newProgram(shaders []shader, attributes []string) (program, error) {
gl := c.gl
p := gl.CreateProgram()
if p.Value == 0 {
@ -253,6 +253,11 @@ func (c *context) newProgram(shaders []shader) (program, error) {
for _, shader := range shaders {
gl.AttachShader(p, mgl.Shader(shader))
}
for i, name := range attributes {
gl.BindAttribLocation(p, mgl.Attrib{uint(i)}, name)
}
gl.LinkProgram(p)
v := gl.GetProgrami(p, mgl.LINK_STATUS)
if v == mgl.FALSE {
@ -308,31 +313,19 @@ func (c *context) uniformFloats(p program, location string, v []float32) {
}
}
func (c *context) getAttribLocationImpl(p program, location string) attribLocation {
func (c *context) vertexAttribPointer(p program, index int, size int, dataType dataType, stride int, offset int) {
gl := c.gl
a := attribLocation(gl.GetAttribLocation(mgl.Program(p), location))
if a.Value == ^uint(0) {
panic("invalid attrib location: " + location)
}
return a
gl.VertexAttribPointer(mgl.Attrib{uint(index)}, size, mgl.Enum(dataType), false, stride, offset)
}
func (c *context) vertexAttribPointer(p program, location string, size int, dataType dataType, stride int, offset int) {
func (c *context) enableVertexAttribArray(p program, index int) {
gl := c.gl
l := c.locationCache.GetAttribLocation(c, p, location)
gl.VertexAttribPointer(mgl.Attrib(l), size, mgl.Enum(dataType), false, stride, offset)
gl.EnableVertexAttribArray(mgl.Attrib{uint(index)})
}
func (c *context) enableVertexAttribArray(p program, location string) {
func (c *context) disableVertexAttribArray(p program, index int) {
gl := c.gl
l := c.locationCache.GetAttribLocation(c, p, location)
gl.EnableVertexAttribArray(mgl.Attrib(l))
}
func (c *context) disableVertexAttribArray(p program, location string) {
gl := c.gl
l := c.locationCache.GetAttribLocation(c, p, location)
gl.DisableVertexAttribArray(mgl.Attrib(l))
gl.DisableVertexAttribArray(mgl.Attrib{uint(index)})
}
func (c *context) newArrayBuffer(size int) buffer {

15
internal/graphicsdriver/opengl/locationcache.go
View File

@ -18,13 +18,11 @@ package opengl
type locationCache struct {
uniformLocationCache map[programID]map[string]uniformLocation
attribLocationCache map[programID]map[string]attribLocation
}
func newLocationCache() *locationCache {
return &locationCache{
uniformLocationCache: map[programID]map[string]uniformLocation{},
attribLocationCache: map[programID]map[string]attribLocation{},
}
}
@ -40,16 +38,3 @@ func (c *locationCache) GetUniformLocation(context *context, p program, location
}
return l
}
func (c *locationCache) GetAttribLocation(context *context, p program, location string) attribLocation {
id := getProgramID(p)
if _, ok := c.attribLocationCache[id]; !ok {
c.attribLocationCache[id] = map[string]attribLocation{}
}
l, ok := c.attribLocationCache[id][location]
if !ok {
l = context.getAttribLocationImpl(p, location)
c.attribLocationCache[id][location] = l
}
return l
}

24
internal/graphicsdriver/opengl/program.go
View File

@ -38,6 +38,14 @@ type arrayBufferLayout struct {
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 {
@ -58,13 +66,13 @@ func (a *arrayBufferLayout) newArrayBuffer(context *context) buffer {
// enable binds the array buffer the given program to use the array buffer.
func (a *arrayBufferLayout) enable(context *context, program program) {
for _, p := range a.parts {
context.enableVertexAttribArray(program, p.name)
for i := range a.parts {
context.enableVertexAttribArray(program, i)
}
total := a.totalBytes()
offset := 0
for _, p := range a.parts {
context.vertexAttribPointer(program, p.name, p.num, float, total, offset)
for i, p := range a.parts {
context.vertexAttribPointer(program, i, p.num, float, total, offset)
offset += float.SizeInBytes() * p.num
}
}
@ -72,8 +80,8 @@ func (a *arrayBufferLayout) enable(context *context, program program) {
// disable stops using the array buffer.
func (a *arrayBufferLayout) disable(context *context, program program) {
// TODO: Disabling should be done in reversed order?
for _, p := range a.parts {
context.disableVertexAttribArray(program, p.name)
for i := range a.parts {
context.disableVertexAttribArray(program, i)
}
}
@ -210,10 +218,12 @@ func (s *openGLState) reset(context *context) error {
program, err := context.newProgram([]shader{
shaderVertexModelviewNative,
shaderFragmentColorMatrixNative,
})
}, theArrayBufferLayout.names())
if err != nil {
return err
}
s.programs[programKey{
filter: f,
address: a,

3
internal/graphicsdriver/opengl/shader.go
View File

@ -234,9 +234,6 @@ void main(void) {
highp vec2 p0 = pos - texel_size / 2.0 / scale;
highp vec2 p1 = pos + texel_size / 2.0 / scale;
// Prevent this variable from being optimized out.
p0 += varying_tex_region.xy - varying_tex_region.xy;
p1 = adjustTexel(p0, p1);
vec4 c0 = texture2D(texture, p0);