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experimental support for parsing from a float16 mesh (or a float32-quantized-as-ushort mesh)

master
mrq 2023-10-26 13:22:47 +07:00
parent 0efe4c6cef
commit 2601afb5f3
2 changed files with 103 additions and 5 deletions
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97
GL/draw.c
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@ -8,6 +8,31 @@
#include "private.h"
#include "platform.h"
GLushort _quantize( GLfloat v ) {
union { GLfloat f; GLuint ui; } u = {v};
GLuint ui = u.ui;
int s = (ui >> 16) & 0x8000;
int em = ui & 0x7fffffff;
int h = (em - (112 << 23) + (1 << 12)) >> 13;
h = (em < (113 << 23)) ? 0 : h;
h = (em >= (143 << 23)) ? 0x7c00 : h;
h = (em > (255 << 23)) ? 0x7e00 : h;
return (GLushort)(s | h);
}
GLfloat _dequantize( GLushort h ) {
GLuint s = (GLuint) (h & 0x8000) << 16;
int em = h & 0x7fff;
int r = (em + (112 << 10)) << 13;
r = (em < (1 << 10)) ? 0 : r;
r += (em >= (31 << 10)) ? (112 << 23) : 0;
union { GLfloat f; GLuint ui; } u;
u.ui = s | r;
return u.f;
}
AttribPointerList ATTRIB_POINTERS;
GLuint ENABLED_VERTEX_ATTRIBUTES = 0;
@ -63,6 +88,7 @@ GL_FORCE_INLINE GLsizei byte_size(GLenum type) {
case GL_INT: return sizeof(GLint);
case GL_UNSIGNED_INT: return sizeof(GLuint);
case GL_DOUBLE: return sizeof(GLdouble);
case GL_HALF_FLOAT: return sizeof(GLhalf);
case GL_UNSIGNED_INT_2_10_10_10_REV: return sizeof(GLuint);
case GL_FLOAT:
default: return sizeof(GLfloat);
@ -109,6 +135,15 @@ static void _readVertexData3us3f(const GLubyte* in, GLubyte* out) {
output[2] = input[2];
}
static void _readVertexData3usq3f(const GLubyte* in, GLubyte* out) {
const GLushort* input = (const GLushort*) in;
float* output = (float*) out;
output[0] = _dequantize(input[0]);
output[1] = _dequantize(input[1]);
output[2] = _dequantize(input[2]);
}
static void _readVertexData3ui3f(const GLubyte* in, GLubyte* out) {
const GLuint* input = (const GLuint*) in;
float* output = (float*) out;
@ -127,6 +162,15 @@ static void _readVertexData3ub3f(const GLubyte* input, GLubyte* out) {
output[2] = input[2] * ONE_OVER_TWO_FIVE_FIVE;
}
static void _readVertexData3f16_3f(const GLubyte* in, GLubyte* out) {
const GLhalf* input = (const GLhalf*) in;
float* output = (float*) out;
output[0] = input[0];
output[1] = input[1];
output[2] = input[2];
}
static void _readVertexData2f2f(const GLubyte* in, GLubyte* out) {
vec2cpy(out, in);
}
@ -164,6 +208,23 @@ static void _readVertexData2us2f(const GLubyte* in, GLubyte* out) {
output[1] = (float)input[1] / SHRT_MAX;
}
static void _readVertexData2usq3f(const GLubyte* in, GLubyte* out) {
const GLushort* input = (const GLushort*) in;
float* output = (float*) out;
output[0] = _dequantize(input[0]);
output[1] = _dequantize(input[1]);
output[2] = 0.0f;
}
static void _readVertexData2usq2f(const GLubyte* in, GLubyte* out) {
const GLushort* input = (const GLushort*) in;
float* output = (float*) out;
output[0] = _dequantize(input[0]);
output[1] = _dequantize(input[1]);
}
static void _readVertexData2ui2f(const GLubyte* in, GLubyte* out) {
const GLuint* input = (const GLuint*) in;
float* output = (float*) out;
@ -179,6 +240,14 @@ static void _readVertexData2ub2f(const GLubyte* input, GLubyte* out) {
output[1] = input[1] * ONE_OVER_TWO_FIVE_FIVE;
}
static void _readVertexData2f16_2f(const GLubyte* in, GLubyte* out) {
const GLhalf* input = (const GLhalf*) in;
float* output = (float*) out;
output[0] = input[0];
output[1] = input[1];
}
static void _readVertexData2ui3f(const GLubyte* in, GLubyte* out) {
const GLuint* input = (const GLuint*) in;
float* output = (float*) out;
@ -188,6 +257,15 @@ static void _readVertexData2ui3f(const GLubyte* in, GLubyte* out) {
output[2] = 0.0f;
}
static void _readVertexData2f16_3f(const GLubyte* in, GLubyte* out) {
const GLhalf* input = (const GLhalf*) in;
float* output = (float*) out;
output[0] = input[0];
output[1] = input[1];
output[2] = 0.0f;
}
static void _readVertexData4ubARGB(const GLubyte* input, GLubyte* output) {
output[R8IDX] = input[0];
output[G8IDX] = input[1];
@ -493,14 +571,17 @@ ReadPositionFunc calcReadPositionFunc() {
case GL_FLOAT:
return (ATTRIB_POINTERS.vertex.size == 3) ? _readVertexData3f3f:
_readVertexData2f3f;
case GL_HALF_FLOAT:
return (ATTRIB_POINTERS.vertex.size == 3) ? _readVertexData3f16_3f:
_readVertexData2f16_3f;
case GL_BYTE:
case GL_UNSIGNED_BYTE:
return (ATTRIB_POINTERS.vertex.size == 3) ? _readVertexData3ub3f:
_readVertexData2ub3f;
case GL_SHORT:
case GL_UNSIGNED_SHORT:
return (ATTRIB_POINTERS.vertex.size == 3) ? _readVertexData3us3f:
_readVertexData2us3f;
return (ATTRIB_POINTERS.vertex.size == 3) ? _readVertexData3usq3f:
_readVertexData2usq3f;
case GL_INT:
case GL_UNSIGNED_INT:
return (ATTRIB_POINTERS.vertex.size == 3) ? _readVertexData3ui3f:
@ -518,12 +599,14 @@ ReadUVFunc calcReadUVFunc() {
case GL_DOUBLE:
case GL_FLOAT:
return _readVertexData2f2f;
case GL_HALF_FLOAT:
return _readVertexData2f16_2f;
case GL_BYTE:
case GL_UNSIGNED_BYTE:
return _readVertexData2ub2f;
case GL_SHORT:
case GL_UNSIGNED_SHORT:
return _readVertexData2us2f;
return _readVertexData2usq2f;
case GL_INT:
case GL_UNSIGNED_INT:
return _readVertexData2ui2f;
@ -540,12 +623,14 @@ ReadUVFunc calcReadSTFunc() {
case GL_DOUBLE:
case GL_FLOAT:
return _readVertexData2f2f;
case GL_HALF_FLOAT:
return _readVertexData2f16_2f;
case GL_BYTE:
case GL_UNSIGNED_BYTE:
return _readVertexData2ub2f;
case GL_SHORT:
case GL_UNSIGNED_SHORT:
return _readVertexData2us2f;
return _readVertexData2usq2f;
case GL_INT:
case GL_UNSIGNED_INT:
return _readVertexData2ui2f;
@ -562,6 +647,8 @@ ReadNormalFunc calcReadNormalFunc() {
case GL_DOUBLE:
case GL_FLOAT:
return _readVertexData3f3f;
case GL_HALF_FLOAT:
return _readVertexData3f16_3f;
break;
case GL_BYTE:
case GL_UNSIGNED_BYTE:
@ -569,7 +656,7 @@ ReadNormalFunc calcReadNormalFunc() {
break;
case GL_SHORT:
case GL_UNSIGNED_SHORT:
return _readVertexData3us3f;
return _readVertexData3usq3f;
break;
case GL_INT:
case GL_UNSIGNED_INT:

11
include/GL/gl.h
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@ -19,6 +19,10 @@ __BEGIN_DECLS
#include <math.h>
#if __STDCPP_FLOAT16_T__
#include <stdfloat>
#endif
/* Primitive Types taken from GL for compatability */
/* Not all types are implemented in Open GL DC V.1.0 */
#define GL_POINTS 0x0000
@ -305,6 +309,7 @@ __BEGIN_DECLS
#define GL_UNSIGNED_INT 0x1405
#define GL_FLOAT 0x1406
#define GL_DOUBLE 0x140A
#define GL_HALF_FLOAT 0x140B
#define GL_2_BYTES 0x1407
#define GL_3_BYTES 0x1408
#define GL_4_BYTES 0x1409
@ -461,6 +466,12 @@ __BEGIN_DECLS
#define GL_FALSE 0
#define GL_TRUE 1
#if __STDCPP_FLOAT16_T__
#define GLhalf std::float16_t
#else
#define GLhalf unsigned short
#endif
/* Stubs for portability */
#define GL_LINE_SMOOTH 0x0B20
#define GL_ALPHA_TEST 0x0BC0