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gl_backend.go
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package nanovgo4
import (
"errors"
"fmt"
"strings"
"github.com/go-gl/gl/v4.1-core/gl"
)
const (
glnvgLocVIEWSIZE = iota
glnvgLocTEX
glnvgLocFRAG
glnvgMaxLOCS
)
// NewContext makes new NanoVGo context that is entry point of this API
func NewContext(flags CreateFlags) (*Context, error) {
params := &glParams{
isEdgeAntiAlias: (flags & AntiAlias) != 0,
context: &glContext{
flags: flags,
},
}
return createInternal(params)
}
type glShader struct {
program Program
fragment Shader
vertex Shader
locations [glnvgMaxLOCS]Uniform
vertexAttrib Attrib
tcoordAttrib Attrib
}
func (s *glShader) createShader(name, header, opts, vShader, fShader string) error {
program := gl.CreateProgram()
vertexShader := Shader{Value: gl.CreateShader(gl.VERTEX_SHADER)}
ShaderSource(vertexShader, strings.Join([]string{header, opts, vShader}, "\n"))
gl.CompileShader(vertexShader.Value)
status := Enum(GetShaderi(vertexShader, gl.COMPILE_STATUS))
if status != gl.TRUE {
return dumpShaderError(vertexShader, name, "vert")
}
fragmentShader := Shader{Value: gl.CreateShader(gl.FRAGMENT_SHADER)}
ShaderSource(fragmentShader, strings.Join([]string{header, opts, fShader}, "\n"))
gl.CompileShader(fragmentShader.Value)
status = Enum(GetShaderi(fragmentShader, gl.COMPILE_STATUS))
if status != gl.TRUE {
return dumpShaderError(fragmentShader, name, "vert")
}
gl.AttachShader(program, vertexShader.Value)
gl.AttachShader(program, fragmentShader.Value)
gl.LinkProgram(program)
status = Enum(GetProgrami(program, gl.LINK_STATUS))
if status != gl.TRUE {
return dumpProgramError(Program{Value: program}, name)
}
s.vertexAttrib = Attrib{Value: uint(gl.GetAttribLocation(program, gl.Str("vertex"+"\x00")))}
s.tcoordAttrib = Attrib{Value: uint(gl.GetAttribLocation(program, gl.Str("tcoord"+"\x00")))}
s.program = Program{Value: program}
s.vertex = vertexShader
s.fragment = fragmentShader
return nil
}
func (s *glShader) deleteShader() {
if s.program.Valid() {
gl.DeleteProgram(s.program.Value)
}
if s.vertex.Valid() {
gl.DeleteShader(s.vertex.Value)
}
if s.fragment.Valid() {
gl.DeleteShader(s.fragment.Value)
}
}
func (s *glShader) getUniforms() {
s.locations[glnvgLocVIEWSIZE] = GetUniformLocation(s.program, "viewSize")
s.locations[glnvgLocTEX] = GetUniformLocation(s.program, "tex")
s.locations[glnvgLocFRAG] = GetUniformLocation(s.program, "frag")
}
const (
glnvgGLUniformArraySize = 11
)
const (
// ImageNoDelete don't delete from memory when removing image
ImageNoDelete ImageFlags = 1 << 16
)
type glContext struct {
shader glShader
view [2]float32
textures []*glTexture
textureID int
vertexBuffer Buffer
vertexArray uint32
flags CreateFlags
calls []glCall
paths []glPath
vertexes []float32
uniforms []glFragUniforms
stencilMask uint32
stencilFunc Enum
stencilFuncRef int
stencilFuncMask uint32
}
func (c *glContext) findTexture(id int) *glTexture {
for _, texture := range c.textures {
if texture.id == id {
return texture
}
}
return nil
}
func (c *glContext) deleteTexture(id int) error {
tex := c.findTexture(id)
if tex != nil && (tex.flags&ImageNoDelete) == 0 {
DeleteTexture(tex.tex)
tex.id = 0
return nil
}
return errors.New("can't find texture")
}
func (c *glContext) bindTexture(tex *Texture) {
if tex == nil {
BindTexture(gl.TEXTURE_2D, Texture{})
} else {
BindTexture(gl.TEXTURE_2D, *tex)
}
}
func (c *glContext) setStencilMask(mask uint32) {
if c.stencilMask != mask {
c.stencilMask = mask
gl.StencilMask(mask)
}
}
func (c *glContext) setStencilFunc(fun Enum, ref int, mask uint32) {
if c.stencilFunc != fun || c.stencilFuncRef != ref || c.stencilFuncMask != mask {
c.stencilFunc = fun
c.stencilFuncRef = ref
c.stencilMask = mask
StencilFunc(fun, ref, mask)
}
}
func (c *glContext) checkError(str string) {
if c.flags&Debug == 0 {
return
}
err := gl.GetError()
if err != gl.NO_ERROR {
dumpLog("Error %08x after %s\n", err, str)
panic("error so stopping")
}
}
func (c *glContext) allocVertexMemory(size int) int {
offset := len(c.vertexes)
c.vertexes = append(c.vertexes, make([]float32, 4*size)...)
return offset
}
func (c *glContext) allocFragUniforms(n int) ([]glFragUniforms, int) {
ret := len(c.uniforms)
c.uniforms = append(c.uniforms, make([]glFragUniforms, n)...)
return c.uniforms[ret:], ret
}
func (c *glContext) allocPath(n int) ([]glPath, int) {
ret := len(c.paths)
c.paths = append(c.paths, make([]glPath, n)...)
return c.paths[ret:], ret
}
func (c *glContext) allocTexture() *glTexture {
var tex *glTexture
for _, texture := range c.textures {
if texture.id == 0 {
tex = texture
break
}
}
if tex == nil {
tex = &glTexture{}
c.textures = append(c.textures, tex)
}
c.textureID++
tex.id = c.textureID
return tex
}
func (c *glContext) convertPaint(frag *glFragUniforms, paint *Paint, scissor *nvgScissor, width, fringe, strokeThr float32) error {
frag.setInnerColor(paint.innerColor.PreMultiply())
frag.setOuterColor(paint.outerColor.PreMultiply())
if scissor.extent[0] < -0.5 || scissor.extent[1] < -0.5 {
frag.clearScissorMat()
frag.setScissorExt(1.0, 1.0)
frag.setScissorScale(1.0, 1.0)
} else {
xform := &scissor.xform
frag.setScissorMat(xform.Inverse().ToMat3x4())
frag.setScissorExt(scissor.extent[0], scissor.extent[1])
scaleX := sqrtF(xform[0]*xform[0]+xform[2]*xform[2]) / fringe
scaleY := sqrtF(xform[1]*xform[1]+xform[3]*xform[3]) / fringe
frag.setScissorScale(scaleX, scaleY)
}
frag.setExtent(paint.extent)
frag.setStrokeMult((width*0.5 + fringe*0.5) / fringe)
frag.setStrokeThr(strokeThr)
if paint.image != 0 {
tex := c.findTexture(paint.image)
if tex == nil {
return errors.New("invalid texture in GLParams.convertPaint")
}
if tex.flags&ImageFlippy != 0 {
frag.setPaintMat(ScaleMatrix(1.0, -1.0).Multiply(paint.xform).Inverse().ToMat3x4())
} else {
frag.setPaintMat(paint.xform.Inverse().ToMat3x4())
}
frag.setType(nsvgShaderFILLIMG)
if tex.texType == nvgTextureRGBA {
if tex.flags&ImagePreMultiplied != 0 {
frag.setTexType(0)
} else {
frag.setTexType(1)
}
} else {
frag.setTexType(2)
}
} else {
frag.setType(nsvgShaderFILLGRAD)
frag.setRadius(paint.radius)
frag.setFeather(paint.feather)
frag.setPaintMat(paint.xform.Inverse().ToMat3x4())
}
return nil
}
func (c *glContext) setUniforms(uniformOffset, image int) {
frag := c.uniforms[uniformOffset]
Uniform4fv(c.shader.locations[glnvgLocFRAG], frag[:])
if image != 0 {
c.bindTexture(&c.findTexture(image).tex)
checkError(c, "tex paint tex")
} else {
c.bindTexture(&Texture{})
}
}
func (c *glContext) fill(call *glCall) {
pathSentinel := call.pathOffset + call.pathCount
// Draw shapes
gl.Enable(gl.STENCIL_TEST)
c.setStencilMask(0xff)
c.setStencilFunc(gl.ALWAYS, 0x00, 0xff)
gl.ColorMask(false, false, false, false)
// set bindpoint for solid loc
c.setUniforms(call.uniformOffset, 0)
checkError(c, "fill simple")
gl.StencilOpSeparate(gl.FRONT, gl.KEEP, gl.KEEP, gl.INCR_WRAP)
gl.StencilOpSeparate(gl.BACK, gl.KEEP, gl.KEEP, gl.DECR_WRAP)
gl.Disable(gl.CULL_FACE)
for i := call.pathOffset; i < pathSentinel; i++ {
path := &c.paths[i]
gl.DrawArrays(gl.TRIANGLE_FAN, int32(path.fillOffset), int32(path.fillCount))
}
gl.Enable(gl.CULL_FACE)
// Draw anti-aliased pixels
gl.ColorMask(true, true, true, true)
c.setUniforms(call.uniformOffset+1, call.image)
if c.flags&AntiAlias != 0 {
c.setStencilFunc(gl.EQUAL, 0x00, 0xff)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
// Draw fringes
for i := call.pathOffset; i < pathSentinel; i++ {
path := &c.paths[i]
gl.DrawArrays(gl.TRIANGLE_STRIP, int32(path.strokeOffset), int32(path.strokeCount))
}
}
// Draw fill
c.setStencilFunc(gl.NOTEQUAL, 0x00, 0xff)
gl.StencilOp(gl.ZERO, gl.ZERO, gl.ZERO)
gl.DrawArrays(gl.TRIANGLES, int32(call.triangleOffset), int32(call.triangleCount))
gl.Disable(gl.STENCIL_TEST)
}
func (c *glContext) convexFill(call *glCall) {
paths := c.paths[call.pathOffset : call.pathOffset+call.pathCount]
c.setUniforms(call.uniformOffset, call.image)
checkError(c, "convex fill")
for i := range paths {
path := &paths[i]
gl.DrawArrays(gl.TRIANGLE_FAN, int32(path.fillOffset), int32(path.fillCount))
}
if c.flags&AntiAlias != 0 {
for i := range paths {
path := &paths[i]
gl.DrawArrays(gl.TRIANGLE_STRIP, int32(path.strokeOffset), int32(path.strokeCount))
}
}
}
func (c *glContext) stroke(call *glCall) {
paths := c.paths[call.pathOffset : call.pathOffset+call.pathCount]
checkError(c, "stroke fillstart")
if c.flags&StencilStrokes != 0 {
gl.Enable(gl.STENCIL_TEST)
c.setStencilMask(0xff)
// Fill the stroke base without overlap
c.setStencilFunc(gl.EQUAL, 0x00, 0xff)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.INCR)
c.setUniforms(call.uniformOffset+1, call.image)
checkError(c, "stroke fill 0")
for i := range paths {
path := &paths[i]
gl.DrawArrays(gl.TRIANGLE_STRIP, int32(path.strokeOffset), int32(path.strokeCount))
}
// Draw anti-aliased pixels.
c.setUniforms(call.uniformOffset, call.image)
c.setStencilFunc(gl.EQUAL, 0x00, 0xff)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
for i := range paths {
path := &paths[i]
gl.DrawArrays(gl.TRIANGLE_STRIP, int32(path.strokeOffset), int32(path.strokeCount))
}
// Clear stencil buffer.
gl.ColorMask(false, false, false, false)
c.setStencilFunc(gl.ALWAYS, 0x00, 0xff)
gl.StencilOp(gl.ZERO, gl.ZERO, gl.ZERO)
checkError(c, "stroke fill 1")
for i := range paths {
path := &paths[i]
gl.DrawArrays(gl.TRIANGLE_STRIP, int32(path.strokeOffset), int32(path.strokeCount))
}
gl.ColorMask(true, true, true, true)
gl.Disable(gl.STENCIL_TEST)
} else {
checkError(c, "stroke filla")
c.setUniforms(call.uniformOffset, call.image)
checkError(c, "stroke fill")
for i := range paths {
path := &paths[i]
gl.DrawArrays(gl.TRIANGLE_STRIP, int32(path.strokeOffset), int32(path.strokeCount))
}
}
}
func (c *glContext) triangles(call *glCall) {
c.setUniforms(call.uniformOffset, call.image)
checkError(c, "triangles fill")
gl.DrawArrays(gl.TRIANGLES, int32(call.triangleOffset), int32(call.triangleCount))
}
func (c *glContext) triangleStrip(call *glCall) {
c.setUniforms(call.uniformOffset, call.image)
checkError(c, "triangle strip fill")
gl.DrawArrays(gl.TRIANGLE_STRIP, int32(call.triangleOffset), int32(call.triangleCount))
}
type glParams struct {
isEdgeAntiAlias bool
context *glContext
}
func (p *glParams) edgeAntiAlias() bool {
return p.isEdgeAntiAlias
}
func (p *glParams) renderCreate() error {
context := p.context
//align := 4
checkError(context, "init")
if p.edgeAntiAlias() {
err := context.shader.createShader("shader", shaderHeader, "#define EDGE_AA 1", fillVertexShader, fillFragmentShader)
if err != nil {
return err
}
} else {
err := context.shader.createShader("shader", shaderHeader, "", fillVertexShader, fillFragmentShader)
if err != nil {
return err
}
}
checkError(context, "init")
context.shader.getUniforms()
context.vertexBuffer = CreateBuffer()
context.vertexBuffer = CreateBuffer()
context.vertexArray = CreateVao()
checkError(context, "create done")
gl.Finish()
return nil
}
func (p *glParams) renderCreateTexture(texType nvgTextureType, w, h int, flags ImageFlags, data []byte) int {
p.context.checkError("create tex bef")
if nearestPow2(w) != w || nearestPow2(h) != h {
if (flags&ImageRepeatX) != 0 || (flags&ImageRepeatY) != 0 {
dumpLog("Repeat X/Y is not supported for non power-of-two textures (%d x %d)\n", w, h)
flags &= ^(ImageRepeatY | ImageRepeatX)
}
if (flags & ImageGenerateMipmaps) != 0 {
dumpLog("Mip-maps is not support for non power-of-two textures (%d x %d)\n", w, h)
flags &= ^ImageGenerateMipmaps
}
}
tex := p.context.allocTexture()
tex.tex = CreateTexture()
tex.width = w
tex.height = h
tex.texType = texType
tex.flags = flags
p.context.bindTexture(&tex.tex)
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 1)
p.context.checkError("create tex -1")
if texType == nvgTextureRGBA {
data = prepareTextureBuffer(data, w, h, 4)
TexImage2D(gl.TEXTURE_2D, 0, w, h, gl.RGBA, gl.UNSIGNED_BYTE, data)
p.context.checkError("create tex ld")
} else {
p.context.checkError("create tex booo")
data = prepareTextureBuffer(data, w, h, 1)
TexImage2D(gl.TEXTURE_2D, 0, w, h, gl.RED, gl.UNSIGNED_BYTE, data)
p.context.checkError("create tex ooo")
}
p.context.checkError("create tex 0")
if (flags & ImageGenerateMipmaps) != 0 {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
} else {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
}
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
if (flags & ImageRepeatX) != 0 {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
} else {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
}
if (flags & ImageRepeatY) != 0 {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
} else {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
}
p.context.checkError("create tex 1")
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
if (flags & ImageGenerateMipmaps) != 0 {
gl.GenerateMipmap(gl.TEXTURE_2D)
}
p.context.checkError("create tex")
p.context.bindTexture(&Texture{})
return tex.id
}
func (p *glParams) renderDeleteTexture(id int) error {
tex := p.context.findTexture(id)
if tex.tex.Valid() && (tex.flags&ImageNoDelete) == 0 {
DeleteTexture(tex.tex)
tex.id = 0
tex.tex = Texture{}
return nil
}
return errors.New("invalid texture in GLParams.deleteTexture")
}
func (p *glParams) renderUpdateTexture(image, x, y, w, h int, data []byte) error {
tex := p.context.findTexture(image)
if tex == nil {
return errors.New("invalid texture in GLParams.updateTexture")
}
p.context.bindTexture(&tex.tex)
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 1)
if tex.texType == nvgTextureRGBA {
data = data[y*tex.width*4:]
} else {
data = data[y*tex.width:]
}
x = 0
w = tex.width
if tex.texType == nvgTextureRGBA {
TexSubImage2D(gl.TEXTURE_2D, 0, x, y, w, h, gl.RGBA, gl.UNSIGNED_BYTE, data)
} else {
TexSubImage2D(gl.TEXTURE_2D, 0, x, y, w, h, gl.RED, gl.UNSIGNED_BYTE, data)
}
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
p.context.bindTexture(nil)
return nil
}
func (p *glParams) renderGetTextureSize(image int) (int, int, error) {
tex := p.context.findTexture(image)
if tex == nil {
return -1, -1, errors.New("invalid texture in GLParams.getTextureSize")
}
return tex.width, tex.height, nil
}
func (p *glParams) renderViewport(width, height int) {
p.context.view[0] = float32(width)
p.context.view[1] = float32(height)
}
func (p *glParams) renderCancel() {
c := p.context
c.vertexes = c.vertexes[:0]
c.paths = c.paths[:0]
c.calls = c.calls[:0]
c.uniforms = c.uniforms[:0]
}
func (p *glParams) renderFlush() {
c := p.context
if len(c.calls) > 0 {
gl.UseProgram(c.shader.program.Value)
gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
gl.Enable(gl.CULL_FACE)
gl.CullFace(gl.BACK)
gl.FrontFace(gl.CCW)
gl.Enable(gl.BLEND)
gl.Disable(gl.DEPTH_TEST)
gl.Disable(gl.SCISSOR_TEST)
gl.ColorMask(true, true, true, true)
gl.StencilMask(0xffffffff)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
gl.StencilFunc(gl.ALWAYS, 0, 0xffffffff)
gl.ActiveTexture(gl.TEXTURE0)
BindTexture(gl.TEXTURE_2D, Texture{})
c.stencilMask = 0xffffffff
c.stencilFunc = gl.ALWAYS
c.stencilFuncRef = 0
c.stencilFuncMask = 0xffffffff
b := castFloat32ToByte(c.vertexes)
// Upload vertex data
gl.BindVertexArray(c.vertexArray)
gl.BindBuffer(gl.ARRAY_BUFFER, c.vertexBuffer.Value)
BufferData(gl.ARRAY_BUFFER, b, gl.STREAM_DRAW)
gl.EnableVertexAttribArray(uint32(c.shader.vertexAttrib.Value))
gl.EnableVertexAttribArray(uint32(c.shader.tcoordAttrib.Value))
gl.VertexAttribPointer(uint32(c.shader.vertexAttrib.Value), 2, gl.FLOAT, false, 4*4, gl.PtrOffset(0))
gl.VertexAttribPointer(uint32(c.shader.tcoordAttrib.Value), 2, gl.FLOAT, false, 4*4, gl.PtrOffset(8))
// Set view and texture just once per frame.
gl.Uniform1i(c.shader.locations[glnvgLocTEX].Value, 0)
Uniform2fv(c.shader.locations[glnvgLocVIEWSIZE], c.view[:])
for i := range c.calls {
call := &c.calls[i]
switch call.callType {
case glnvgFILL:
c.fill(call)
case glnvgCONVEXFILL:
c.convexFill(call)
case glnvgSTROKE:
c.stroke(call)
case glnvgTRIANGLES:
c.triangles(call)
case glnvgTRIANGLESTRIP:
c.triangleStrip(call)
}
}
gl.DisableVertexAttribArray(uint32(c.shader.vertexAttrib.Value))
gl.DisableVertexAttribArray(uint32(c.shader.tcoordAttrib.Value))
gl.Disable(gl.CULL_FACE)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.UseProgram(0)
c.bindTexture(nil)
}
c.vertexes = c.vertexes[:0]
c.paths = c.paths[:0]
c.calls = c.calls[:0]
c.uniforms = c.uniforms[:0]
}
func (p *glParams) renderFill(paint *Paint, scissor *nvgScissor, fringe float32, bounds [4]float32, paths []nvgPath) {
c := p.context
var glPaths []glPath
c.calls = append(c.calls, glCall{
pathCount: len(paths),
image: paint.image,
})
call := &c.calls[len(c.calls)-1]
glPaths, call.pathOffset = c.allocPath(call.pathCount)
if len(paths) == 0 && paths[0].convex {
call.callType = glnvgCONVEXFILL
} else {
call.callType = glnvgFILL
}
// Allocate vertices for all the paths
vertexOffset := c.allocVertexMemory(maxVertexCount(paths) + 6)
for i := range paths {
glPath := &glPaths[i]
path := &paths[i]
fillCount := len(path.fills)
if fillCount > 0 {
glPath.fillOffset = vertexOffset / 4
glPath.fillCount = fillCount
for j := 0; j < fillCount; j++ {
vertex := &path.fills[j]
c.vertexes[vertexOffset] = vertex.x
c.vertexes[vertexOffset+1] = vertex.y
c.vertexes[vertexOffset+2] = vertex.u
c.vertexes[vertexOffset+3] = vertex.v
vertexOffset += 4
}
} else {
glPath.fillOffset = 0
glPath.fillCount = 0
}
strokeCount := len(path.strokes)
if strokeCount > 0 {
glPath.strokeOffset = vertexOffset / 4
glPath.strokeCount = strokeCount
for j := 0; j < strokeCount; j++ {
vertex := &path.strokes[j]
c.vertexes[vertexOffset] = vertex.x
c.vertexes[vertexOffset+1] = vertex.y
c.vertexes[vertexOffset+2] = vertex.u
c.vertexes[vertexOffset+3] = vertex.v
vertexOffset += 4
}
} else {
glPath.strokeOffset = 0
glPath.strokeCount = 0
}
}
// Quad
call.triangleOffset = vertexOffset / 4
call.triangleCount = 6
c.vertexes[vertexOffset] = bounds[0]
c.vertexes[vertexOffset+1] = bounds[3]
c.vertexes[vertexOffset+2] = 0.5
c.vertexes[vertexOffset+3] = 1.0
vertexOffset += 4
c.vertexes[vertexOffset] = bounds[2]
c.vertexes[vertexOffset+1] = bounds[3]
c.vertexes[vertexOffset+2] = 0.5
c.vertexes[vertexOffset+3] = 1.0
vertexOffset += 4
c.vertexes[vertexOffset] = bounds[2]
c.vertexes[vertexOffset+1] = bounds[1]
c.vertexes[vertexOffset+2] = 0.5
c.vertexes[vertexOffset+3] = 1.0
vertexOffset += 4
c.vertexes[vertexOffset] = bounds[0]
c.vertexes[vertexOffset+1] = bounds[3]
c.vertexes[vertexOffset+2] = 0.5
c.vertexes[vertexOffset+3] = 1.0
vertexOffset += 4
c.vertexes[vertexOffset] = bounds[2]
c.vertexes[vertexOffset+1] = bounds[1]
c.vertexes[vertexOffset+2] = 0.5
c.vertexes[vertexOffset+3] = 1.0
vertexOffset += 4
c.vertexes[vertexOffset] = bounds[0]
c.vertexes[vertexOffset+1] = bounds[1]
c.vertexes[vertexOffset+2] = 0.5
c.vertexes[vertexOffset+3] = 1.0
// Setup uniforms for draw calls
var paintFrag *glFragUniforms
if call.callType == glnvgFILL {
var uniforms []glFragUniforms
uniforms, call.uniformOffset = c.allocFragUniforms(2)
// Simple shader for stencil
u0 := &uniforms[0]
u0.reset()
u0.setStrokeThr(-1.0)
u0.setType(nsvgShaderSIMPLE)
paintFrag = &uniforms[1]
} else {
var frags []glFragUniforms
frags, call.uniformOffset = c.allocFragUniforms(1)
paintFrag = &frags[0]
}
// Fill shader
paintFrag.reset()
c.convertPaint(paintFrag, paint, scissor, fringe, fringe, -1.0)
}
func (p *glParams) renderStroke(paint *Paint, scissor *nvgScissor, fringe float32, strokeWidth float32, paths []nvgPath) {
c := p.context
var glPaths []glPath
p.context.calls = append(c.calls, glCall{})
call := &c.calls[len(c.calls)-1]
call.callType = glnvgSTROKE
glPaths, call.pathOffset = c.allocPath(len(paths))
call.pathCount = len(paths)
call.image = paint.image
// Allocate vertices for all the paths
vertexOffset := c.allocVertexMemory(maxVertexCount(paths))
for i := range paths {
glPath := &glPaths[i]
path := &paths[i]
strokeCount := len(path.strokes)
if strokeCount > 0 {
glPath.strokeOffset = vertexOffset / 4
glPath.strokeCount = strokeCount
for j := 0; j < strokeCount; j++ {
vertex := &path.strokes[j]
c.vertexes[vertexOffset] = vertex.x
c.vertexes[vertexOffset+1] = vertex.y
c.vertexes[vertexOffset+2] = vertex.u
c.vertexes[vertexOffset+3] = vertex.v
vertexOffset += 4
}
} else {
glPath.strokeOffset = 0
glPath.strokeCount = 0
}
}
// Fill shader
if c.flags&StencilStrokes != 0 {
var uniforms []glFragUniforms
uniforms, call.uniformOffset = c.allocFragUniforms(2)
u0 := &uniforms[0]
u0.reset()
c.convertPaint(u0, paint, scissor, strokeWidth, fringe, -1.0)
u1 := &uniforms[1]
u1.reset()
c.convertPaint(u1, paint, scissor, strokeWidth, fringe, -1.0-0.5/266.0)
} else {
var frags []glFragUniforms
frags, call.uniformOffset = c.allocFragUniforms(1)
f0 := &frags[0]
f0.reset()
c.convertPaint(f0, paint, scissor, strokeWidth, fringe, -1.0)
}
}
func (p *glParams) renderTriangles(paint *Paint, scissor *nvgScissor, vertexes []nvgVertex) {
c := p.context
vertexCount := len(vertexes)
vertexOffset := c.allocVertexMemory(vertexCount)
callIndex := len(c.calls)
c.calls = append(c.calls, glCall{
callType: glnvgTRIANGLES,
image: paint.image,
triangleOffset: vertexOffset / 4,
triangleCount: vertexCount,
})
call := &c.calls[callIndex]
for i := 0; i < vertexCount; i++ {
vertex := &vertexes[i]
c.vertexes[vertexOffset] = vertex.x
c.vertexes[vertexOffset+1] = vertex.y
c.vertexes[vertexOffset+2] = vertex.u
c.vertexes[vertexOffset+3] = vertex.v
vertexOffset += 4
}
// Fill shader
var frags []glFragUniforms
frags, call.uniformOffset = c.allocFragUniforms(1)
f0 := &frags[0]
f0.reset()
c.convertPaint(f0, paint, scissor, 1.0, 1.0, -1.0)
f0.setType(nsvgShaderIMG)
}
func (p *glParams) renderTriangleStrip(paint *Paint, scissor *nvgScissor, vertexes []nvgVertex) {
c := p.context
vertexCount := len(vertexes)
vertexOffset := c.allocVertexMemory(vertexCount)
callIndex := len(c.calls)
c.calls = append(c.calls, glCall{
callType: glnvgTRIANGLESTRIP,
image: paint.image,
triangleOffset: vertexOffset / 4,
triangleCount: vertexCount,
})
call := &c.calls[callIndex]
for i := 0; i < vertexCount; i++ {
vertex := &vertexes[i]
c.vertexes[vertexOffset] = vertex.x
c.vertexes[vertexOffset+1] = vertex.y
c.vertexes[vertexOffset+2] = vertex.u
c.vertexes[vertexOffset+3] = vertex.v
vertexOffset += 4
}
// Fill shader
var frags []glFragUniforms
frags, call.uniformOffset = c.allocFragUniforms(1)
f0 := &frags[0]
f0.reset()
c.convertPaint(f0, paint, scissor, 1.0, 1.0, -1.0)
f0.setType(nsvgShaderIMG)
}
func (p *glParams) renderDelete() {
c := p.context
c.shader.deleteShader()
if c.vertexBuffer.Valid() {
DeleteBuffer(c.vertexBuffer)
}
for _, texture := range c.textures {
if texture.tex.Valid() && (texture.flags&ImageNoDelete) == 0 {
DeleteTexture(texture.tex)
}
}
p.context = nil
}
func dumpShaderError(shader Shader, name, typeName string) error {
str := GetShaderInfoLog(shader)
msg := fmt.Sprintf("Shader %s/%s error:\n%s\n", name, typeName, str)
dumpLog(msg)
return errors.New(msg)
}
func dumpProgramError(program Program, name string) error {
str := GetProgramInfoLog(program)
msg := fmt.Sprintf("Program %s error:\n%s\n", name, str)
dumpLog(msg)
return errors.New(msg)
}
func checkError(p *glContext, str string) {
if p.flags&Debug == 0 {
return
}
err := gl.GetError()
if err != gl.NO_ERROR {
dumpLog("Error %08x after %s\n", int(err), str)
}
}
func maxVertexCount(paths []nvgPath) int {
count := 0
for i := range paths {
path := &paths[i]
count += len(path.fills)
count += len(path.strokes)
}
return count
}
var fillVertexShader = `
#ifdef NANOVG_GL3
uniform vec2 viewSize;
in vec2 vertex;
in vec2 tcoord;
out vec2 ftcoord;
out vec2 fpos;
#else
uniform vec2 viewSize;
attribute vec2 vertex;
attribute vec2 tcoord;
varying vec2 ftcoord;
varying vec2 fpos;
#endif
void main(void) {
ftcoord = tcoord;
fpos = vertex;
gl_Position = vec4(2.0*vertex.x/viewSize.x - 1.0, 1.0 - 2.0*vertex.y/viewSize.y, 0, 1);
}`
var fillFragmentShader = `
#ifdef GL_ES
#if defined(GL_FRAGMENT_PRECISION_HIGH) || defined(NANOVG_GL3)
precision highp float;
#else
precision mediump float;
#endif
#endif
#ifdef NANOVG_GL3
#ifdef USE_UNIFORMBUFFER
layout(std140) uniform frag {
mat3 scissorMat;
mat3 paintMat;
vec4 innerCol;
vec4 outerCol;
vec2 scissorExt;
vec2 scissorScale;
vec2 extent;
float radius;
float feather;
float strokeMult;
float strokeThr;
int texType;
int type;
};
#else
// NANOVG_GL3 && !USE_UNIFORMBUF
uniform vec4 frag[UNIFORMARRAY_SIZE];
#endif
uniform sampler2D tex;
in vec2 ftcoord;
in vec2 fpos;
out vec4 outColor;
#else
// !NANOVG_GL3
uniform vec4 frag[UNIFORMARRAY_SIZE];
uniform sampler2D tex;
varying vec2 ftcoord;
varying vec2 fpos;
#endif
#ifndef USE_UNIFORMBUFFER
#define scissorMat mat3(frag[0].xyz, frag[1].xyz, frag[2].xyz)
#define paintMat mat3(frag[3].xyz, frag[4].xyz, frag[5].xyz)
#define innerCol frag[6]
#define outerCol frag[7]
#define scissorExt frag[8].xy
#define scissorScale frag[8].zw
#define extent frag[9].xy
#define radius frag[9].z
#define feather frag[9].w
#define strokeMult frag[10].x
#define strokeThr frag[10].y
#define texType int(frag[10].z)
#define type int(frag[10].w)
#endif