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Improve the performance of _readVertexData1i3f

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This commit is contained in:
Luke Benstead 2020-05-06 20:15:28 +01:00
parent 2d0e13b64e
commit 0a14db39a8
1 changed files with 17 additions and 14 deletions
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31
GL/draw.c
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@ -129,24 +129,27 @@ static void _readVertexData3f3f(const GLubyte* in, GLubyte* out) {
output[2] = input[2];
}
GL_FORCE_INLINE float conv_i10_to_norm_float(int i10) {
struct attr_bits_10 {
signed int x:10;
} val;
val.x = i10;
return (2.0F * (float)val.x + 1.0F) * (1.0F / 1023.0F);
}
// 10:10:10:2REV format
static void _readVertexData1i3f(const GLubyte* in, GLubyte* out) {
const GLint* input = (const GLint*) in;
const static float MULTIPLIER = 1.0f / 1023.0f;
GLfloat* output = (GLfloat*) out;
output[0] = conv_i10_to_norm_float((*input) & 0x3ff);
output[1] = conv_i10_to_norm_float(((*input) >> 10) & 0x3ff);
output[2] = conv_i10_to_norm_float(((*input) >> 20) & 0x3ff);
union {
int value;
struct {
signed int x: 10;
signed int y: 10;
signed int z: 10;
signed int w: 2;
} bits;
} input;
input.value = *((const GLint*) in);
output[0] = (2.0f * (float) input.bits.x + 1.0f) * MULTIPLIER;
output[1] = (2.0f * (float) input.bits.y + 1.0f) * MULTIPLIER;
output[2] = (2.0f * (float) input.bits.z + 1.0f) * MULTIPLIER;
}
static void _readVertexData3us3f(const GLubyte* in, GLubyte* out) {