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Fix infuriating memory corruption bug

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This commit is contained in:
Luke Benstead 2023-05-20 07:47:39 +01:00
parent f6713bc778
commit 026bdeff09
3 changed files with 19 additions and 17 deletions
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3
GL/private.h
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@ -164,7 +164,8 @@ typedef struct {
GLboolean isCompressed;
GLboolean isPaletted;
//50
} TextureObject;
GLubyte padding[14]; // Pad to 64-bytes
} __attribute__((aligned(32))) TextureObject;
typedef struct {
GLfloat emissive[4];

32
GL/texture.c
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@ -21,7 +21,7 @@ static TextureObject* TEXTURE_UNITS[MAX_GLDC_TEXTURE_UNITS] = {NULL, NULL};
static NamedArray TEXTURE_OBJECTS;
GLubyte ACTIVE_TEXTURE = 0;
static TexturePalette* SHARED_PALETTES[MAX_GLDC_SHARED_PALETTES];
static TexturePalette* SHARED_PALETTES[MAX_GLDC_SHARED_PALETTES] = {NULL, NULL, NULL, NULL};
static GLuint _determinePVRFormat(GLint internalFormat, GLenum type);
@ -122,8 +122,11 @@ static void _glReleasePaletteSlot(GLshort slot, GLushort size)
gl_assert(size == 16 || size == 256);
if (size == 16) {
GLushort bank = slot / MAX_GLDC_PALETTE_SLOTS;
GLushort subbank = slot % MAX_GLDC_PALETTE_SLOTS;
GLushort bank = slot / MAX_GLDC_4BPP_PALETTE_SLOTS;
GLushort subbank = slot % MAX_GLDC_4BPP_PALETTE_SLOTS;
gl_assert(bank < MAX_GLDC_PALETTE_SLOTS);
gl_assert(subbank < MAX_GLDC_4BPP_PALETTE_SLOTS);
SUBBANKS_USED[bank][subbank] = GL_FALSE;
@ -135,6 +138,7 @@ static void _glReleasePaletteSlot(GLshort slot, GLushort size)
BANKS_USED[bank] = GL_FALSE;
}
else {
gl_assert(slot < MAX_GLDC_PALETTE_SLOTS);
BANKS_USED[slot] = GL_FALSE;
for (i = 0; i < MAX_GLDC_4BPP_PALETTE_SLOTS; ++i) {
SUBBANKS_USED[slot][i] = GL_FALSE;
@ -475,18 +479,18 @@ static void _glInitializeTextureObject(TextureObject* txr, unsigned int id) {
}
GLubyte _glInitTextures() {
uint32_t i;
named_array_init(&TEXTURE_OBJECTS, sizeof(TextureObject), MAX_TEXTURE_COUNT);
// Reserve zero so that it is never given to anyone as an ID!
named_array_reserve(&TEXTURE_OBJECTS, 0);
// Initialize zero as an actual texture object though because apparently it is!
_glInitializeTextureObject((TextureObject*) named_array_get(&TEXTURE_OBJECTS, 0), 0);
TextureObject* default_tex = (TextureObject*) named_array_get(&TEXTURE_OBJECTS, 0);
_glInitializeTextureObject(default_tex, 0);
TEXTURE_UNITS[0] = default_tex;
TEXTURE_UNITS[1] = default_tex;
for (i=0; i < MAX_GLDC_SHARED_PALETTES;i++){
for(int i = 0; i < MAX_GLDC_SHARED_PALETTES; i++){
SHARED_PALETTES[i] = _initTexturePalette();
}
@ -534,6 +538,7 @@ void APIENTRY glActiveTextureARB(GLenum texture) {
ACTIVE_TEXTURE = texture & 0xF;
gl_assert(ACTIVE_TEXTURE < MAX_GLDC_TEXTURE_UNITS);
gl_assert(ACTIVE_TEXTURE >= 0);
gl_assert(TEXTURE_OBJECTS.element_size > 0);
}
@ -547,10 +552,9 @@ void APIENTRY glGenTextures(GLsizei n, GLuint *textures) {
gl_assert(TEXTURE_OBJECTS.element_size > 0);
while(n--) {
for(GLsizei i = 0; i < n; ++i) {
GLuint id = 0;
TextureObject* txr = (TextureObject*) named_array_alloc(&TEXTURE_OBJECTS, &id);
gl_assert(txr);
gl_assert(id); // Generated IDs must never be zero
@ -559,8 +563,7 @@ void APIENTRY glGenTextures(GLsizei n, GLuint *textures) {
gl_assert(txr->index == id);
*textures = id;
textures++;
textures[i] = id;
}
gl_assert(TEXTURE_OBJECTS.element_size > 0);
@ -588,7 +591,8 @@ void APIENTRY glDeleteTextures(GLsizei n, GLuint *textures) {
for(GLuint j = 0; j < MAX_GLDC_TEXTURE_UNITS; ++j) {
if(txr == TEXTURE_UNITS[j]) {
TEXTURE_UNITS[j] = NULL;
// Reset to the default texture
TEXTURE_UNITS[j] = (TextureObject*) named_array_get(&TEXTURE_OBJECTS, 0);
}
}
@ -612,8 +616,6 @@ void APIENTRY glDeleteTextures(GLsizei n, GLuint *textures) {
}
named_array_release(&TEXTURE_OBJECTS, id);
textures[i] = 0;
txr->index = 0;
}
}

1
containers/named_array.c
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@ -68,7 +68,6 @@ void* named_array_reserve(NamedArray* array, unsigned int id) {
void named_array_release(NamedArray* array, unsigned int new_id) {
unsigned int i = new_id / 8;
unsigned int j = new_id % 8;
array->used_markers[i] &= (unsigned char) ~(1 << j);
}