func TexImage2D(target Enum, level int, width, height int, format Enum, ty Enum, data []byte) {
p := unsafe.Pointer(nil)
if len(data) > 0 {
p = unsafe.Pointer(&data[0])
}
C.glTexImage2D(target.c(), C.GLint(level), C.GLint(format), C.GLsizei(width), C.GLsizei(height), 0, format.c(), ty.c(), p)
}
func CopyTexSubImage2D(target uint, level, xoffset, yoffset,
x, y, width, height int) {
C.glCopyTexSubImage2D(
C.GLenum(target), C.GLint(level),
C.GLint(xoffset), C.GLint(yoffset),
C.GLint(x), C.GLint(y), C.GLsizei(width), C.GLsizei(height))
}
func TexImage2D(target TextureTarget, level int, internalformat InternalFormat, width, height int, format TextureFormat, datatype DataType, pixels []uint8) {
if pixels != nil {
C.glTexImage2D(C.GLenum(target), C.GLint(level), C.GLint(internalformat), C.GLsizei(width), C.GLsizei(height), 0, C.GLenum(format), C.GLenum(datatype), unsafe.Pointer(&pixels[0]))
} else {
C.glTexImage2D(C.GLenum(target), C.GLint(level), C.GLint(internalformat), C.GLsizei(width), C.GLsizei(height), 0, C.GLenum(format), C.GLenum(datatype), unsafe.Pointer(nil))
}
}
func ReadPixels(dst []byte, x, y, width, height int, format, ty Enum) {
defer func() {
errstr := errDrain()
log.Printf("gl.ReadPixels(len(%d), %v, %v, %v, %v, %v, %v) %v", len(dst), x, y, width, height, format, ty, errstr)
}()
C.glReadPixels(C.GLint(x), C.GLint(y), C.GLsizei(width), C.GLsizei(height), format.c(), ty.c(), unsafe.Pointer(&dst[0]))
}
func Uniform3i(location, v0, v1, v2 int32) {
defer func() {
errstr := errDrain()
log.Printf("gl.Uniform3i(%v, %v, %v, %v) %v", location, v0, v1, v2, errstr)
}()
C.glUniform3i(C.GLint(location), C.GLint(v0), C.GLint(v1), C.GLint(v2))
}
//void glMap1d (GLenum target, float64 u1, float64 u2, int stride, int order, const float64 *points)
func Map1d(target GLenum, u1 float64, u2 float64, stride int, order int, points []float64) {
if len(points) == 0 {
panic("Invalid points size")
}
C.glMap1d(C.GLenum(target), C.GLdouble(u1), C.GLdouble(u2),
C.GLint(stride), C.GLint(order), (*C.GLdouble)(&points[0]))
}
func CopyTexImage2D(target uint, level int, internalformat uint,
x, y, width, height, border int) {
C.glCopyTexImage2D(
C.GLenum(target), C.GLint(level), C.GLenum(internalformat),
C.GLint(x), C.GLint(y), C.GLsizei(width), C.GLsizei(height),
C.GLint(border))
}
//void glMap1f (GLenum target, float32 u1, float32 u2, int stride, int order, const float32 *points)
func Map1f(target GLenum, u1 float32, u2 float32, stride int, order int, points []float32) {
if len(points) == 0 {
panic("Invalid points size")
}
C.glMap1f(C.GLenum(target), C.GLfloat(u1), C.GLfloat(u2), C.GLint(stride),
C.GLint(order), (*C.GLfloat)(&points[0]))
}
func Uniform2i(
location int32, x int32, y int32) {
C.glUniform2i(
C.GLint(location),
C.GLint(x),
C.GLint(y))
}
func CopyTexSubImage2D(target Enum, level, xoffset, yoffset, x, y, width, height int) {
defer func() {
errstr := errDrain()
log.Printf("gl.CopyTexSubImage2D(%v, %v, %v, %v, %v, %v, %v, %v) %v", target, level, xoffset, yoffset, x, y, width, height, errstr)
}()
C.glCopyTexSubImage2D(target.c(), C.GLint(level), C.GLint(xoffset), C.GLint(yoffset), C.GLint(x), C.GLint(y), C.GLsizei(width), C.GLsizei(height))
}
func CompressedTexSubImage2D(target Enum, level, xoffset, yoffset, width, height int, format Enum, data []byte) {
defer func() {
errstr := errDrain()
log.Printf("gl.CompressedTexSubImage2D(%v, %v, %v, %v, %v, %v, %v, len(%d)) %v", target, level, xoffset, yoffset, width, height, format, len(data), errstr)
}()
C.glCompressedTexSubImage2D(target.c(), C.GLint(level), C.GLint(xoffset), C.GLint(yoffset), C.GLsizei(width), C.GLsizei(height), format.c(), C.GLsizei(len(data)), unsafe.Pointer(&data[0]))
}
func Uniform4i(dst Uniform, v0, v1, v2, v3 int32) {
defer func() {
errstr := errDrain()
log.Printf("gl.Uniform4i(%v, %v, %v, %v, %v) %v", dst, v0, v1, v2, v3, errstr)
}()
C.glUniform4i(dst.c(), C.GLint(v0), C.GLint(v1), C.GLint(v2), C.GLint(v3))
}
func Viewport(x, y, width, height int) {
defer func() {
errstr := errDrain()
log.Printf("gl.Viewport(%v, %v, %v, %v) %v", x, y, width, height, errstr)
}()
C.glViewport(C.GLint(x), C.GLint(y), C.GLsizei(width), C.GLsizei(height))
}
func TexSubImage2D(target Enum, level int, x, y, width, height int, format, ty Enum, data []byte) {
defer func() {
errstr := errDrain()
log.Printf("gl.TexSubImage2D(%v, %v, %v, %v, %v, %v, %v, %v, len(%d)) %v", target, level, x, y, width, height, format, ty, len(data), errstr)
}()
C.glTexSubImage2D(target.c(), C.GLint(level), C.GLint(x), C.GLint(y), C.GLsizei(width), C.GLsizei(height), format.c(), ty.c(), unsafe.Pointer(&data[0]))
}
func Uniform2i(dst Uniform, v0, v1 int) {
defer func() {
errstr := errDrain()
log.Printf("gl.Uniform2i(%v, %v, %v) %v", dst, v0, v1, errstr)
}()
C.glUniform2i(dst.c(), C.GLint(v0), C.GLint(v1))
}
func Scissor(x, y, width, height int32) {
defer func() {
errstr := errDrain()
log.Printf("gl.Scissor(%v, %v, %v, %v) %v", x, y, width, height, errstr)
}()
C.glScissor(C.GLint(x), C.GLint(y), C.GLsizei(width), C.GLsizei(height))
}
func CopyTexImage2D(target Enum, level int, internalformat Enum, x, y, width, height, border int) {
defer func() {
errstr := errDrain()
log.Printf("gl.CopyTexImage2D(%v, %v, %v, %v, %v, %v, %v, %v) %v", target, level, internalformat, x, y, width, height, border, errstr)
}()
C.glCopyTexImage2D(target.c(), C.GLint(level), internalformat.c(), C.GLint(x), C.GLint(y), C.GLsizei(width), C.GLsizei(height), C.GLint(border))
}
func ReadAlpha(image *image.Alpha) {
alignment := C.GLint(0)
C.glGetIntegerv(C.GL_PACK_ALIGNMENT, &alignment)
align := C.GLint(1)
for align < alignment && image.Stride%(int(align)*2) == 0 {
align *= 2
}
// need smaller alignment
if align < alignment {
C.glPixelStorei(C.GL_PACK_ALIGNMENT, align)
}
C.glReadPixels(C.GLint(image.Rect.Min.X), C.GLint(image.Rect.Min.Y),
C.GLsizei(image.Rect.Dx()), C.GLsizei(image.Rect.Dy()),
C.GL_ALPHA, C.GL_UNSIGNED_BYTE, unsafe.Pointer(&image.Pix[0]))
// restore alignment
if align < alignment {
C.glPixelStorei(C.GL_PACK_ALIGNMENT, alignment)
}
}
func Viewport(
x int32, y int32, width Sizei, height Sizei) {
C.glViewport(
C.GLint(x),
C.GLint(y),
C.GLsizei(width),
C.GLsizei(height))
}
func CompressedTexImage2D(target uint, level int, internalformat uint,
width, height, border, imageSize int, data Void) {
C.glCompressedTexImage2D(
C.GLenum(target), C.GLint(level), C.GLenum(internalformat),
C.GLsizei(width), C.GLsizei(height),
C.GLint(border), C.GLsizei(imageSize),
unsafe.Pointer(data))
}
// TexImage2D writes a 2D texture image.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glTexImage2D.xhtml
func TexImage2D(target Enum, level int, width, height int, format Enum, ty Enum, data []byte) {
// TODO(crawshaw): GLES3 offset for PIXEL_UNPACK_BUFFER and PIXEL_PACK_BUFFER.
p := unsafe.Pointer(nil)
if len(data) > 0 {
p = unsafe.Pointer(&data[0])
}
C.glTexImage2D(target.c(), C.GLint(level), C.GLint(format), C.GLsizei(width), C.GLsizei(height), 0, format.c(), ty.c(), p)
}
//void glMap2f (GLenum target, float32 u1, float32 u2, int ustride, int uorder, float32 v1, float32 v2, int vstride, int vorder, const float32 *points)
func Map2f(target GLenum, u1 float32, u2 float32, ustride int, uorder int, v1 float32, v2 float32, vstride int, vorder int, points []float32) {
if len(points) == 0 {
panic("Invalid points size")
}
C.glMap2f(C.GLenum(target), C.GLfloat(u1), C.GLfloat(u2), C.GLint(ustride),
C.GLint(uorder), C.GLfloat(v1), C.GLfloat(v2), C.GLint(vstride),
C.GLint(vorder), (*C.GLfloat)(&points[0]))
}
//void glMap2d (GLenum target, float64 u1, float64 u2, int ustride, int uorder, float64 v1, float64 v2, int vstride, int vorder, const float64 *points)
func Map2d(target GLenum, u1 float64, u2 float64, ustride int, uorder int, v1 float64, v2 float64, vstride int, vorder int, points []float64) {
if len(points) == 0 {
panic("Invalid points size")
}
C.glMap2d(C.GLenum(target), C.GLdouble(u1), C.GLdouble(u2), C.GLint(ustride),
C.GLint(uorder), C.GLdouble(v1), C.GLdouble(v2), C.GLint(vstride),
C.GLint(vorder), (*C.GLdouble)(&points[0]))
}
func TexSubImage2D(target uint, level, xoffset, yoffset, width, height int,
format, type_ uint, pixels Void) {
C.glTexSubImage2D(C.GLenum(target), C.GLint(level),
C.GLint(xoffset), C.GLint(yoffset), C.GLsizei(width), C.GLsizei(height),
C.GLenum(format), C.GLenum(type_),
unsafe.Pointer(pixels))
}
func Uniform3i(
location int32, x int32, y int32, z int32) {
C.glUniform3i(
C.GLint(location),
C.GLint(x),
C.GLint(y),
C.GLint(z))
}
func Scissor(
x int32, y int32, width Sizei, height Sizei) {
C.glScissor(
C.GLint(x),
C.GLint(y),
C.GLsizei(width),
C.GLsizei(height))
}
func CompressedTexSubImage2D(target uint, level, xoffset, yoffset int,
width, height int, format uint, imageSize int, data Void) {
C.glCompressedTexSubImage2D(
C.GLenum(target), C.GLint(level),
C.GLint(xoffset), C.GLint(yoffset),
C.GLsizei(width), C.GLsizei(height),
C.GLenum(format), C.GLsizei(imageSize),
unsafe.Pointer(data))
}
func (program *Program) GetUniform(name string) Uniform {
cname := (*C.GLchar)(C.CString(name))
defer C.free(unsafe.Pointer(cname))
loc := C.GLint(C.glGetUniformLocation(program.id, cname))
if loc < 0 {
panic(fmt.Errorf("not an active uniform: %s", name))
}
datatype := C.GLenum(0)
length := C.GLsizei(0)
size := C.GLint(0)
uname := [32]byte{}
C.glGetActiveUniform(program.id, C.GLuint(loc), C.GLsizei(len(uname)), &length, &size, &datatype, (*C.GLchar)(unsafe.Pointer(&uname[0])))
switch datatype {
case C.GL_FLOAT:
return Uniform1f{uniformBase{loc}}
case C.GL_FLOAT_VEC2:
return Uniform2f{uniformBase{loc}}
case C.GL_FLOAT_VEC3:
return Uniform3f{uniformBase{loc}}
case C.GL_FLOAT_VEC4:
return Uniform4f{uniformBase{loc}}
case C.GL_INT:
return Uniform1i{uniformBase{loc}}
case C.GL_INT_VEC2:
return Uniform2i{uniformBase{loc}}
case C.GL_INT_VEC3:
return Uniform3i{uniformBase{loc}}
case C.GL_INT_VEC4:
return Uniform4i{uniformBase{loc}}
case C.GL_BOOL:
return Uniform1i{uniformBase{loc}}
case C.GL_BOOL_VEC2:
return Uniform2i{uniformBase{loc}}
case C.GL_BOOL_VEC3:
return Uniform3i{uniformBase{loc}}
case C.GL_BOOL_VEC4:
return Uniform4i{uniformBase{loc}}
case C.GL_FLOAT_MAT2:
return UniformMatrix2f{uniformBase{loc}}
case C.GL_FLOAT_MAT3:
return UniformMatrix3f{uniformBase{loc}}
case C.GL_FLOAT_MAT4:
return UniformMatrix4f{uniformBase{loc}}
case C.GL_SAMPLER_2D:
return Uniform1i{uniformBase{loc}}
case C.GL_SAMPLER_CUBE:
return Uniform1i{uniformBase{loc}}
default:
panic(fmt.Errorf("unsupported uniform type: %#x", datatype))
}
}
func TexImage2D(target Enum, level int, width, height int, format Enum, ty Enum, data []byte) {
defer func() {
errstr := errDrain()
log.Printf("gl.TexImage2D(%v, %v, %v, %v, %v, %v, len(%d)) %v", target, level, width, height, format, ty, len(data), errstr)
}()
p := unsafe.Pointer(nil)
if len(data) > 0 {
p = unsafe.Pointer(&data[0])
}
C.glTexImage2D(target.c(), C.GLint(level), C.GLint(format), C.GLsizei(width), C.GLsizei(height), 0, format.c(), ty.c(), p)
}
func (game *game) drawFrame() {
time += .05
color := (C.GLclampf(math.Sin(time)) + 1) * .5
C.glUniform2f(C.GLint(game.offsetUni), C.GLfloat(game.offsetX), C.GLfloat(game.offsetY))
C.glUniform3f(C.GLint(game.colorUni), 1.0, C.GLfloat(color), 0)
C.glClear(C.GL_COLOR_BUFFER_BIT | C.GL_DEPTH_BUFFER_BIT)
C.glUseProgram(game.prog)
C.glDrawArrays(C.GL_TRIANGLES, 0, 3)
}