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Optimized nextHigher2.

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svn-id: r50907
This commit is contained in:
Alejandro Marzini 2010-07-15 04:20:21 +00:00
parent 36583ff888
commit 25f1980dad
1 changed files with 21 additions and 7 deletions
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28
backends/graphics/opengl/gltexture.cpp
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@ -41,17 +41,24 @@ static inline GLint xdiv(int numerator, int denominator) {
return (numerator << 16) / denominator;
}
static GLuint nextHigher2(GLuint k) {
if (k == 0)
static GLuint nextHigher2(GLuint v) {
if (v == 0)
return 1;
GLuint nextPow = 1;
while (nextPow <= k) {
nextPow <<= 1;
}
return nextPow;
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
return v++;
}
void GLTexture::initGLExtensions() {
static bool inited = false;
if (inited)
return;
const char* ext_string =
reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
Common::StringTokenizer tokenizer(ext_string, " ");
@ -60,6 +67,7 @@ void GLTexture::initGLExtensions() {
if (token == "GL_ARB_texture_non_power_of_two")
npot_supported = true;
}
inited = true;
}
GLTexture::GLTexture(byte bpp, GLenum format, GLenum type)
@ -100,6 +108,12 @@ void GLTexture::allocBuffer(GLuint w, GLuint h) {
// Already allocated a sufficiently large buffer
return;
nextHigher2(0);
nextHigher2(100);
nextHigher2(1025);
nextHigher2(9999);
if (npot_supported) {
_textureWidth = w;
_textureHeight = h;