On Wednesday, 3 June 2015 at 10:21:20 UTC, Kyoji Klyden wrote:
On Wednesday, 3 June 2015 at 08:11:16 UTC, Kagamin wrote:
On Tuesday, 2 June 2015 at 16:41:38 UTC, Kyoji Klyden wrote:
src:
string source = readText("test.glvert");
const string sources = source.toStringz;
const int len = source.length;
GLuint vertShader = glCreateShader( GL_VERTEX_SHADER );
glShaderSource(vertShader, 1, &sources, &len);
Judging by the docs, you don't need null-terminated strings
and can use native D strings, just pass their lengths:
string source = readText("test.glvert");
const char* sources = source.ptr;
const GLint len = cast(GLint)source.length;
GLuint vertShader = glCreateShader( GL_VERTEX_SHADER );
glShaderSource(vertShader, 1, &sources, &len);
Oh that also works quite well!
Is casting necessary there though? DerelictGL treats GL types
as D types, and .length is size_t so wouldn't it just turn into
an int regardless??
size_t can be 32bit or 64bit, depending on your platform. Don't
know how large GLint is. Assigning 64bit to 32bit requires an
explicit cast, because it can lose information.
Also the one part I don't understand is with &sources. So is
this passing sources as a reference, but sources itself is a
pointer to a pointer? I'm just a tad confused on how this part
works :S
A string (or any other array slice for that matter) is internally
the equivalent of:
struct Slice(T) {
T* ptr;
size_t length;
}
(maybe the order of fields is different, I never remember that
part)
`&source` will give you the address of that structure.
