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Start parser for Wavefront 3D Object file format

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This commit is contained in:
Doyle Thai 2017-05-20 22:56:57 +10:00
parent a25b50c501
commit ce539d4903
2 changed files with 343 additions and 12 deletions
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223
src/DTRenderer.cpp
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@ -11,6 +11,153 @@
#include <math.h> #include <math.h>
typedef struct ModelFace
{
i32 numVertex;
i32 *vertexIndex;
i32 *textureIndex;
i32 *normalIndex;
} ModelFace;
FILE_SCOPE bool ObjWavefrontLoad(const PlatformAPI api, PlatformMemory *const memory,
const char *const path)
{
if (!memory || ! path) return false;
PlatformFile file = {};
if (!api.FileOpen(path, &file, PlatformFilePermissionFlag_Read))
return false; // TODO(doyle): Logging
DqnTempBuffer tmpMemRegion = DqnMemBuffer_BeginTempRegion(&memory->transientBuffer);
u8 *rawBytes = (u8 *)DqnMemBuffer_Allocate(&memory->transientBuffer, file.size);
size_t bytesRead = api.FileRead(&file, rawBytes, file.size);
size_t fileSize = file.size;
api.FileClose(&file);
if (bytesRead != file.size)
{
// TODO(doyle): Logging
DqnMemBuffer_EndTempRegion(tmpMemRegion);
return false;
}
#if 0
DqnV3 *vertex;
ModelFace *face;
#endif
enum WavefrontVertexType {
WavefrontVertexType_Invalid,
WavefrontVertexType_Geometric,
WavefrontVertexType_Texture,
WavefrontVertexType_Normal,
};
DqnArray<DqnV4> vGeometricArray = {};
DqnArray<DqnV3> vTextureArray = {};
DqnArray<DqnV3> vNormalArray = {};
DQN_ASSERT(DqnArray_Init(&vGeometricArray, 1000) && DqnArray_Init(&vTextureArray, 1000) &&
DqnArray_Init(&vNormalArray, 1000));
for (char *scan = (char *)rawBytes; scan;)
{
switch (*scan)
{
// Vertex Format: v[ |t|n|p] f32 f32 f32 [f32]
case 'v':
{
scan++;
DQN_ASSERT(scan);
enum WavefrontVertexType type = WavefrontVertexType_Invalid;
if (*scan == ' ') type = WavefrontVertexType_Geometric;
else if (*scan == 't' || *scan == 'n')
{
scan++;
if (*scan == 't') type = WavefrontVertexType_Texture;
else type = WavefrontVertexType_Normal;
}
else DQN_ASSERT(DQN_INVALID_CODE_PATH);
i32 vIndex = 0;
DqnV4 v4 = {0, 0, 0, 1.0f};
// Progress to first non space character after vertex identifier
for (; scan && *scan == ' '; scan++)
if (!scan) DQN_ASSERT(DQN_INVALID_CODE_PATH);
for (;;)
{
char *f32StartPtr = scan;
for (; *scan != ' ' && *scan != '\n';)
{
DQN_ASSERT(DqnChar_IsDigit(*scan) || (*scan == '.') || (*scan == '-') ||
*scan == 'e');
scan++;
}
i32 f32Len = (i32)((size_t)scan - (size_t)f32StartPtr);
v4.e[vIndex++] = Dqn_StrToF32(f32StartPtr, f32Len);
DQN_ASSERT(vIndex < DQN_ARRAY_COUNT(v4.e));
while (scan && (*scan == ' ' || *scan == '\n')) scan++;
if (!scan) break;
if (!(DqnChar_IsDigit(*scan) || *scan == '-')) break;
}
DQN_ASSERT(vIndex == 3 || vIndex == 4);
if (type == WavefrontVertexType_Geometric)
{
DqnArray_Push(&vGeometricArray, v4);
}
else if (type == WavefrontVertexType_Texture)
{
DqnArray_Push(&vTextureArray, v4.xyz);
}
else if (type == WavefrontVertexType_Normal)
{
DqnArray_Push(&vNormalArray, v4.xyz);
}
else
{
DQN_ASSERT(DQN_INVALID_CODE_PATH);
}
}
break;
// Face Format: i32/i32/i32 i32/i32/i32 i32/i32/i32
case 'f':
{
}
break;
// Comment
case '#':
{
// Skip comment line until new line
while (scan && *scan != '\n')
scan++;
// Skip new lines and any leading white spaces
while (scan && (*scan == '\n' || *scan == ' '))
scan++;
}
break;
default:
{
DQN_ASSERT(DQN_INVALID_CODE_PATH);
}
break;
}
}
DqnMemBuffer_EndTempRegion(tmpMemRegion);
return true;
}
FILE_SCOPE bool BitmapFontCreate(const PlatformAPI api, FILE_SCOPE bool BitmapFontCreate(const PlatformAPI api,
PlatformMemory *const memory, PlatformMemory *const memory,
DTRFont *const font, const char *const path, DTRFont *const font, const char *const path,
@ -1031,6 +1178,78 @@ void CompAssignment(PlatformRenderBuffer *const renderBuffer, PlatformInput *con
} }
} }
FILE_SCOPE void TestStrToF32Converter()
{
const f32 EPSILON = 0.001f;
const char a[] = "-0.66248";
f32 vA = Dqn_StrToF32(a, DQN_ARRAY_COUNT(a));
DQN_ASSERT(DQN_ABS(vA) - DQN_ABS(-0.66248f) < EPSILON);
const char b[] = "-0.632053";
f32 vB = Dqn_StrToF32(b, DQN_ARRAY_COUNT(b));
DQN_ASSERT(DQN_ABS(vB) - DQN_ABS(-0.632053f) < EPSILON);
const char c[] = "-0.244271";
f32 vC = Dqn_StrToF32(c, DQN_ARRAY_COUNT(c));
DQN_ASSERT(DQN_ABS(vC) - DQN_ABS(-0.244271f) < EPSILON);
const char d[] = "-0.511812";
f32 vD = Dqn_StrToF32(d, DQN_ARRAY_COUNT(d));
DQN_ASSERT(DQN_ABS(vD) - DQN_ABS(-0.511812f) < EPSILON);
const char e[] = "-0.845392";
f32 vE = Dqn_StrToF32(e, DQN_ARRAY_COUNT(e));
DQN_ASSERT(DQN_ABS(vE) - DQN_ABS(-0.845392f) < EPSILON);
const char f[] = "0.127809";
f32 vF = Dqn_StrToF32(f, DQN_ARRAY_COUNT(f));
DQN_ASSERT(DQN_ABS(vF) - DQN_ABS(-0.127809f) < EPSILON);
const char g[] = "0.532";
f32 vG = Dqn_StrToF32(g, DQN_ARRAY_COUNT(g));
DQN_ASSERT(DQN_ABS(vG) - DQN_ABS(-0.532f) < EPSILON);
const char h[] = "0.923";
f32 vH = Dqn_StrToF32(h, DQN_ARRAY_COUNT(h));
DQN_ASSERT(DQN_ABS(vH) - DQN_ABS(-0.923f) < EPSILON);
const char i[] = "0.000";
f32 vI = Dqn_StrToF32(i, DQN_ARRAY_COUNT(i));
DQN_ASSERT(DQN_ABS(vI) - DQN_ABS(-0.000f) < EPSILON);
const char j[] = "0.000283538";
f32 vJ = Dqn_StrToF32(j, DQN_ARRAY_COUNT(j));
DQN_ASSERT(DQN_ABS(vJ) - DQN_ABS(-0.000283538f) < EPSILON);
const char k[] = "-1.25";
f32 vK = Dqn_StrToF32(k, DQN_ARRAY_COUNT(k));
DQN_ASSERT(DQN_ABS(vK) - DQN_ABS(-1.25f) < EPSILON);
const char l[] = "0.286843";
f32 vL = Dqn_StrToF32(l, DQN_ARRAY_COUNT(l));
DQN_ASSERT(DQN_ABS(vL) - DQN_ABS(-0.286843f) < EPSILON);
const char m[] = "-0.406";
f32 vM = Dqn_StrToF32(m, DQN_ARRAY_COUNT(m));
DQN_ASSERT(DQN_ABS(vM) - DQN_ABS(-0.406f) < EPSILON);
const char n[] = "-0.892";
f32 vN = Dqn_StrToF32(n, DQN_ARRAY_COUNT(n));
DQN_ASSERT(DQN_ABS(vN) - DQN_ABS(-0.892f) < EPSILON);
const char o[] = "0.201";
f32 vO = Dqn_StrToF32(o, DQN_ARRAY_COUNT(o));
DQN_ASSERT(DQN_ABS(vO) - DQN_ABS(-0.201f) < EPSILON);
const char p[] = "1.25";
f32 vP = Dqn_StrToF32(p, DQN_ARRAY_COUNT(p));
DQN_ASSERT(DQN_ABS(vP) - DQN_ABS(1.25f) < EPSILON);
const char q[] = "9.64635e-05";
f32 vQ = Dqn_StrToF32(q, DQN_ARRAY_COUNT(q));
DQN_ASSERT(DQN_ABS(vQ) - DQN_ABS(9.64635e-05) < EPSILON);
}
extern "C" void DTR_Update(PlatformRenderBuffer *const renderBuffer, extern "C" void DTR_Update(PlatformRenderBuffer *const renderBuffer,
PlatformInput *const input, PlatformInput *const input,
PlatformMemory *const memory) PlatformMemory *const memory)
@ -1045,6 +1264,7 @@ extern "C" void DTR_Update(PlatformRenderBuffer *const renderBuffer,
DTR_DEBUG_TIMED_FUNCTION(); DTR_DEBUG_TIMED_FUNCTION();
if (!memory->isInit) if (!memory->isInit)
{ {
TestStrToF32Converter();
DTR_DEBUG_TIMED_BLOCK("DTR_Update Memory Initialisation"); DTR_DEBUG_TIMED_BLOCK("DTR_Update Memory Initialisation");
// NOTE(doyle): Do premultiply ourselves // NOTE(doyle): Do premultiply ourselves
stbi_set_unpremultiply_on_load(true); stbi_set_unpremultiply_on_load(true);
@ -1067,8 +1287,9 @@ extern "C" void DTR_Update(PlatformRenderBuffer *const renderBuffer,
&memory->transientBuffer); &memory->transientBuffer);
int x = 5; int x = 5;
DqnMemBuffer_EndTempRegion(tmp); DqnMemBuffer_EndTempRegion(tmp);
}
ObjWavefrontLoad(input->api, memory, "african_head.obj");
}
DTRRender_Clear(renderBuffer, DqnV3_3f(0, 0, 0)); DTRRender_Clear(renderBuffer, DqnV3_3f(0, 0, 0));
#if 1 #if 1

126
src/dqn.h
View File

@ -28,9 +28,9 @@ typedef uint32_t u32;
typedef uint16_t u16; typedef uint16_t u16;
typedef uint8_t u8; typedef uint8_t u8;
typedef int32_t i64; typedef int64_t i64;
typedef int32_t i32; typedef int32_t i32;
typedef int64_t i16; typedef int16_t i16;
typedef double f64; typedef double f64;
typedef float f32; typedef float f32;
@ -535,10 +535,13 @@ DQN_FILE_SCOPE inline bool operator==(DqnV3 a, DqnV3 b) { return DqnV3_E
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////
// Vec4 // Vec4
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////
typedef union DqnV4 typedef union DqnV4 {
{
struct { f32 x, y, z, w; }; struct { f32 x, y, z, w; };
DqnV3 xyz;
struct { f32 r, g, b, a; }; struct { f32 r, g, b, a; };
DqnV3 rgb;
f32 e[4]; f32 e[4];
DqnV2 v2[2]; DqnV2 v2[2];
} DqnV4; } DqnV4;
@ -626,12 +629,16 @@ DQN_FILE_SCOPE i32 Dqn_StrFindFirstOccurence(const char *const src, const i32 s
DQN_FILE_SCOPE bool Dqn_StrHasSubstring (const char *const src, const i32 srcLen, const char *const find, const i32 findLen); DQN_FILE_SCOPE bool Dqn_StrHasSubstring (const char *const src, const i32 srcLen, const char *const find, const i32 findLen);
#define DQN_32BIT_NUM_MAX_STR_SIZE 11 #define DQN_32BIT_NUM_MAX_STR_SIZE 11
#define DQN_64BIT_NUM_MAX_STR_SIZE 20 #define DQN_64BIT_NUM_MAX_STR_SIZE 21
// Return the len of the derived string. If buf is NULL and or bufSize is 0 the // Return the len of the derived string. If buf is NULL and or bufSize is 0 the
// function returns the required string length for the integer. // function returns the required string length for the integer.
DQN_FILE_SCOPE i32 Dqn_I64ToStr(i64 value, char *const buf, const i32 bufSize); DQN_FILE_SCOPE i32 Dqn_I64ToStr(i64 value, char *const buf, const i32 bufSize);
DQN_FILE_SCOPE i64 Dqn_StrToI64(const char *const buf, const i32 bufSize); DQN_FILE_SCOPE i64 Dqn_StrToI64(const char *const buf, const i32 bufSize);
// WARNING: Not robust, precision errors and whatnot but good enough!
DQN_FILE_SCOPE f32 Dqn_StrToF32(const char *const buf, const i32 bufSize);
// Both return the number of bytes read, return 0 if invalid codepoint or UTF8 // Both return the number of bytes read, return 0 if invalid codepoint or UTF8
DQN_FILE_SCOPE u32 Dqn_UCSToUTF8(u32 *dest, u32 character); DQN_FILE_SCOPE u32 Dqn_UCSToUTF8(u32 *dest, u32 character);
DQN_FILE_SCOPE u32 Dqn_UTF8ToUCS(u32 *dest, u32 character); DQN_FILE_SCOPE u32 Dqn_UTF8ToUCS(u32 *dest, u32 character);
@ -2535,7 +2542,6 @@ DQN_FILE_SCOPE i32 Dqn_I64ToStr(i64 value, char *const buf, const i32 bufSize)
return 1; return 1;
} }
// NOTE(doyle): Max 32bit integer (+-)2147483647
i32 charIndex = 0; i32 charIndex = 0;
bool negative = false; bool negative = false;
if (value < 0) negative = true; if (value < 0) negative = true;
@ -2546,12 +2552,30 @@ DQN_FILE_SCOPE i32 Dqn_I64ToStr(i64 value, char *const buf, const i32 bufSize)
charIndex++; charIndex++;
} }
i32 val = DQN_ABS(value); bool lastDigitDecremented = false;
i64 val = DQN_ABS(value);
if (val < 0)
{
// TODO(doyle): This will occur if we are checking the smallest number
// possible in i64 since the range of negative numbers is one more than
// it is for positives, so ABS will fail.
lastDigitDecremented = true;
val = DQN_ABS(val - 1);
DQN_ASSERT(val >= 0);
}
if (validBuffer) if (validBuffer)
{ {
if (lastDigitDecremented)
{
i64 rem = (val % 10) + 1;
buf[charIndex++] = (u8)rem + '0';
val /= 10;
}
while (val != 0 && charIndex < bufSize) while (val != 0 && charIndex < bufSize)
{ {
i32 rem = val % 10; i64 rem = val % 10;
buf[charIndex++] = (u8)rem + '0'; buf[charIndex++] = (u8)rem + '0';
val /= 10; val /= 10;
} }
@ -2616,6 +2640,92 @@ DQN_FILE_SCOPE i64 Dqn_StrToI64(const char *const buf, const i32 bufSize)
return result; return result;
} }
DQN_FILE_SCOPE f32 Dqn_StrToF32(const char *const buf, const i32 bufSize)
{
if (!buf || bufSize == 0) return 0;
i32 index = 0;
bool isNegative = false;
if (buf[index] == '-')
{
index++;
isNegative = true;
}
bool isPastDecimal = false;
i32 numDigitsAfterDecimal = 0;
i32 rawNumber = 0;
f32 digitShiftValue = 1.0f;
f32 digitShiftMultiplier = 0.1f;
for (i32 i = index; i < bufSize; i++)
{
char ch = buf[i];
if (ch == '.')
{
isPastDecimal = true;
continue;
}
// Handle scientific notation
else if (ch == 'e')
{
bool digitShiftIsPositive = true;
if (i < bufSize)
{
if (buf[i + 1] == '-') digitShiftIsPositive = false;
DQN_ASSERT(buf[i + 1] == '-' || buf[i + 1] == '+');
i += 2;
}
i32 exponentPow = 0;
bool scientificNotation = false;
while (i < bufSize)
{
scientificNotation = true;
char exponentCh = buf[i];
if (DqnChar_IsDigit(exponentCh))
{
exponentPow *= 10;
exponentPow += (buf[i] - '0');
}
else
{
i = bufSize;
}
i++;
}
// NOTE(doyle): If exponent not specified but this branch occurred,
// the float string has a malformed scientific notation in the
// string, i.e. "e" followed by no number.
DQN_ASSERT(scientificNotation);
numDigitsAfterDecimal += exponentPow;
if (digitShiftIsPositive) digitShiftMultiplier = 10.0f;
}
else if (DqnChar_IsDigit(ch))
{
numDigitsAfterDecimal += (i32)isPastDecimal;
rawNumber *= 10;
rawNumber += (ch - '0');
}
else
{
break;
}
}
for (i32 i = 0; i < numDigitsAfterDecimal; i++)
digitShiftValue *= digitShiftMultiplier;
f32 result = (f32)rawNumber;
if (numDigitsAfterDecimal > 0) result *= digitShiftValue;
if (isNegative) result *= -1;
return result;
}
/* /*
Encoding Encoding
The following byte sequences are used to represent a character. The sequence The following byte sequences are used to represent a character. The sequence