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Properly unpack byte float2/float4 for vertex normal support

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This commit is contained in:
Joshua Goins 2022-04-12 09:47:22 -04:00
parent 88c43149dc
commit f674fbe75b
1 changed files with 45 additions and 10 deletions
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55
src/mdlparser.cpp
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@ -7,6 +7,34 @@
#include <fstream>
#include <algorithm>
// from lumina.halfextensions
static float Unpack(ushort value) {
uint num3;
if ((value & -33792) == 0) {
if ((value & 0x3ff) != 0) {
auto num2 = 0xfffffff2;
auto num = (uint) (value & 0x3ff);
while ((num & 0x400) == 0) {
num2--;
num <<= 1;
}
num &= 0xfffffbff;
num3 = ((uint) (value & 0x8000) << 0x10) | ((num2 + 0x7f) << 0x17) | (num << 13);
} else {
num3 = (uint) ((value & 0x8000) << 0x10);
}
} else {
num3 =
(uint)
(((value & 0x8000) << 0x10) |
((((value >> 10) & 0x1f) - 15 + 0x7f) << 0x17) |
((value & 0x3ff) << 13));
}
return *(float *) &num3;
}
Model parseMDL(const std::string_view path) {
FILE* file = fopen(path.data(), "rb");
if(file == nullptr) {
@ -308,11 +336,6 @@ Model parseMDL(const std::string_view path) {
const VertexDeclaration decl = vertexDecls[j];
std::vector<VertexElement> orderedElements = decl.elements;
std::sort(orderedElements.begin(), orderedElements.end(), [](VertexElement a, VertexElement b) {
return a.offset > b.offset;
});
enum VertexType : uint8_t {
Single3 = 2,
Single4 = 3,
@ -337,7 +360,7 @@ Model parseMDL(const std::string_view path) {
std::vector<Vertex> vertices(vertexCount);
for(int k = 0; k < vertexCount; k++) {
for(auto & orderedElement : orderedElements) {
for(auto & orderedElement : decl.elements) {
VertexType type = (VertexType)orderedElement.type;
VertexUsage usage = (VertexUsage)orderedElement.usage;
@ -360,19 +383,31 @@ Model parseMDL(const std::string_view path) {
case VertexType::ByteFloat4:
fseek(file, sizeof(uint8_t) * 4, SEEK_CUR);
break;
case VertexType::Half2:
fseek(file, sizeof(uint16_t) * 2, SEEK_CUR);
case VertexType::Half2: {
uint16_t values[2];
fread(values, sizeof(uint16_t) * 2, 1, file);
floatData[0] = Unpack(values[0]);
floatData[1] = Unpack(values[1]);
}
break;
case VertexType::Half4:
fseek(file, sizeof(uint16_t) * 4, SEEK_CUR);
case VertexType::Half4: {
uint16_t values[4];
fread(values, sizeof(uint16_t) * 4, 1, file);
floatData[0] = Unpack(values[0]);
floatData[1] = Unpack(values[1]);
floatData[2] = Unpack(values[2]);
floatData[3] = Unpack(values[3]);
}
break;
}
switch(usage) {
case VertexUsage::Position:
fmt::print("position\n");
memcpy(vertices[k].position.data(), floatData.data(), sizeof(float) * 3);
break;
case VertexUsage::Normal:
fmt::print("normal\n");
memcpy(vertices[k].normal.data(), floatData.data(), sizeof(float) * 3);
break;
}