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atlas.c
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atlas.c
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#include "internal.h"
/* tracing channel for this file */
#define GLHCK_CHANNEL GLHCK_CHANNEL_ATLAS
/* \brief count textures */
static unsigned short _glhckAtlasNumTextures(const glhckAtlas *object)
{
_glhckAtlasRect *r;
unsigned short count = 0;
for (r = object->rect; r; r = r->next) ++count;
return count;
}
/* \brief get packed area for packed texture */
static _glhckAtlasArea* _glhckAtlasGetPackedArea(const glhckAtlas *object, glhckTexture *texture)
{
_glhckAtlasRect *r;
CALL(2, "%p, %p", object, texture);
assert(object && texture);
/* find packed area */
for (r = object->rect; r; r = r->next)
if (r->texture == texture) {
RET(2, "%p", &r->packed);
return &r->packed;
}
RET(2, "%p", NULL);
return NULL;
}
/* \brief drop all rects and free reference to texture */
static void _glhckAtlasDropRects(glhckAtlas *object)
{
_glhckAtlasRect *r, *rn;
CALL(0, "%p", object);
assert(object);
/* drop all rects */
for (r = object->rect; r; r = rn) {
rn = r->next;
glhckTextureFree(r->texture);
_glhckFree(r);
}
}
/***
* public api
***/
/* \brief create new atlas object */
GLHCKAPI glhckAtlas* glhckAtlasNew(void)
{
glhckAtlas *object;
TRACE(0);
if (!(object = _glhckCalloc(1, sizeof(glhckAtlas))))
goto fail;
/* increase reference */
object->refCounter++;
/* insert to world */
_glhckWorldInsert(atlas, object, glhckAtlas*);
RET(0, "%p", object);
return object;
fail:
RET(0, "%p", NULL);
return NULL;
}
/* \brief free atlas */
GLHCKAPI unsigned int glhckAtlasFree(glhckAtlas *object)
{
if (!glhckInitialized()) return 0;
CALL(FREE_CALL_PRIO(object), "%p", object);
assert(object);
/* there is still references to this atlas alive */
if (--object->refCounter != 0) goto success;
/* free all references */
_glhckAtlasDropRects(object);
/* free atlas texture */
IFDO(glhckTextureFree, object->texture);
/* remove from world */
_glhckWorldRemove(atlas, object, glhckAtlas*);
/* free */
NULLDO(_glhckFree, object);
success:
RET(FREE_RET_PRIO(object), "%u", object?object->refCounter:0);
return object?object->refCounter:0;
}
/* \brief insert texture to atlas */
GLHCKAPI int glhckAtlasInsertTexture(glhckAtlas *object, glhckTexture *texture)
{
_glhckAtlasRect *rect;
CALL(0, "%p, %p", object, texture);
assert(object && texture);
/* find if the texture is already added */
for (rect = object->rect; rect &&
rect->texture != texture; rect = rect->next);
/* this texture is already inserted */
if (rect)
goto success;
/* insert here */
if (!(rect = object->rect)) {
rect = object->rect = _glhckCalloc(1, sizeof(_glhckAtlasRect));
} else {
for (; rect && rect->next; rect = rect->next);
rect = rect->next = _glhckCalloc(1, sizeof(_glhckAtlasRect));
}
if (!rect)
goto fail;
/* assign reference */
rect->texture = glhckTextureRef(texture);
success:
RET(0, "%d", RETURN_OK);
return RETURN_OK;
fail:
RET(0, "%d", RETURN_FAIL);
return RETURN_FAIL;
}
/* \brief remove texture from atlas */
GLHCKAPI int glhckAtlasRemoveTexture(glhckAtlas *object, glhckTexture *texture)
{
_glhckAtlasRect *rect, *found;
CALL(0, "%p, %p", object, texture);
assert(object && texture);
if (!(rect = object->rect))
goto _return;
/* remove here */
if (rect->texture == texture) {
object->rect = rect->next;
_glhckFree(rect);
} else {
for (; rect && rect->next &&
rect->next->texture != texture;
rect = rect->next);
if ((found = rect->next)) {
rect->next = found->next;
_glhckFree(found);
}
}
_return:
RET(0, "%d", RETURN_OK);
return RETURN_OK;
}
/* \brief return combined texture */
GLHCKAPI glhckTexture* glhckAtlasGetTexture(glhckAtlas *object)
{
CALL(1, "%p", object);
assert(object);
RET(1, "%p", object->texture);
return object->texture;
}
/* \brief pack textures to atlas */
GLHCKAPI int glhckAtlasPack(glhckAtlas *object, glhckTextureFormat format, int powerOfTwo, int border, const glhckTextureParameters *params)
{
int width, height, realWidth, realHeight, maxTexSize;
unsigned short count;
_glhckTexturePacker *tp;
_glhckAtlasRect *rect;
glhckFramebuffer *fbo = NULL;
glhckTexture *texture = NULL;
glhckObject *plane = NULL;
glhckMaterial *material = NULL;
kmMat4 projection;
CALL(0, "%p, %d, %d", object, powerOfTwo, border);
/* count textures */
for (count = 0, rect = object->rect;
rect; rect = rect->next) {
rect->index = count++;
}
/* only one texture silly */
if (count==1) {
IFDO(glhckTextureFree, object->texture);
object->texture = glhckTextureRef(object->rect->texture);
RET(0, "%d", RETURN_OK);
return RETURN_OK;
}
/* new texture packer */
if (!(tp = _glhckTexturePackerNew()))
goto fail;
_glhckTexturePackerCount(tp, count);
/* add textures to packer */
for (rect = object->rect;
rect; rect = rect->next)
_glhckTexturePackerAdd(tp,
rect->texture->width, rect->texture->height);
/* pack textures */
_glhckTexturePackerPack(tp, &width, &height, powerOfTwo, border);
/* downscale if over maximum texture size */
realWidth = width, realHeight = height;
maxTexSize = GLHCKRF()->texture.maxTextureSize;
if (width > maxTexSize) {
height *= (float)maxTexSize/width;
width = maxTexSize;
DEBUG(GLHCK_DBG_WARNING, "Downscaling atlas texture to: %dx%d", width, height);
} else if (height > maxTexSize) {
width *= (float)maxTexSize/height;
height = maxTexSize;
DEBUG(GLHCK_DBG_WARNING, "Downscaling atlas texture to: %dx%d", width, height);
}
/* create stuff needed for rendering */
if (!(texture = glhckTextureNew()))
goto fail;
if (!(glhckTextureCreate(texture, GLHCK_TEXTURE_2D, 0, width, height, 0, 0, format, GLHCK_UNSIGNED_BYTE, 0, NULL)))
goto fail;
if (!(fbo = glhckFramebufferNew(GLHCK_FRAMEBUFFER)))
goto fail;
if (!glhckFramebufferAttachTexture(fbo, texture, GLHCK_COLOR_ATTACHMENT0))
goto fail;
if (!(plane = glhckPlaneNewEx(1, 1, GLHCK_IDX_AUTO, GLHCK_VTX_V2F)))
goto fail;
if (!(material = glhckMaterialNew(NULL)))
goto fail;
/* set material to object */
glhckObjectMaterial(plane, material);
/* create projection for drawing */
kmMat4Translation(&projection, -1.0f, -1.0f, 0.0f);
/* render atlas */
glhckFramebufferRecti(fbo, 0, 0, width, height);
glhckFramebufferBegin(fbo);
glhckRenderFlip(0);
glhckRenderPass(GLHCK_PASS_TEXTURE);
glhckRenderProjectionOnly(&projection);
glhckRenderClearColorb(0,0,0,0);
glhckRenderClear(GLHCK_COLOR_BUFFER_BIT);
for (rect = object->rect; rect; rect = rect->next) {
rect->packed.rotated = _glhckTexturePackerGetLocation(tp,
rect->index, &rect->packed.x1, &rect->packed.y1,
&rect->packed.x2, &rect->packed.y2);
/* rotate if need */
if (rect->packed.rotated)
glhckObjectRotatef(plane, 0, 0, 90);
else
glhckObjectRotatef(plane, 0, 0, 0);
/* position */
glhckObjectScalef(plane, (kmScalar)rect->packed.x2/realWidth, (kmScalar)rect->packed.y2/realHeight, 1.0f);
glhckObjectPositionf(plane,
(kmScalar)(rect->packed.x1*2+rect->packed.x2)/realWidth,
(kmScalar)(rect->packed.y1*2+rect->packed.y2)/realHeight,
0.0f);
/* transform rect to fit the real width */
if (width != realWidth) {
rect->packed.x1 *= (float)width/realWidth;
rect->packed.x2 *= (float)width/realWidth;
}
/* transform rect to fit the real height */
if (height != realHeight) {
rect->packed.y1 *= (float)height/realHeight;
rect->packed.y2 *= (float)height/realHeight;
}
/* draw texture */
glhckMaterialTexture(material, rect->texture);
glhckObjectRender(plane);
}
glhckFramebufferEnd(fbo);
/* reference rtt's texture */
IFDO(glhckTextureFree, object->texture);
glhckTextureParameter(texture, (params?params:glhckTextureDefaultSpriteParameters()));
if (_glhckHasAlpha(format)) texture->importFlags |= GLHCK_TEXTURE_IMPORT_ALPHA;
object->texture = texture;
/* cleanup */
glhckMaterialFree(material);
glhckObjectFree(plane);
glhckFramebufferFree(fbo);
_glhckTexturePackerFree(tp);
RET(0, "%d", RETURN_OK);
return RETURN_OK;
fail:
IFDO(glhckMaterialFree, material);
IFDO(glhckObjectFree, plane);
IFDO(glhckFramebufferFree, fbo);
IFDO(glhckTextureFree, texture);
IFDO(_glhckTexturePackerFree, tp);
RET(0, "%d", RETURN_FAIL);
return RETURN_FAIL;
}
/* \brief return pointer to texture by index */
GLHCKAPI glhckTexture* glhckAtlasGetTextureByIndex(const glhckAtlas *object, unsigned short index)
{
_glhckAtlasRect *rect;
CALL(1, "%p, %d", object, index);
assert(object);
for (rect = object->rect; rect &&
rect->index != index; rect = rect->next);
RET(1, "%p", rect?rect->texture:NULL);
return rect?rect->texture:NULL;
}
/* \brief return transformed coordinates of packed texture */
GLHCKAPI int glhckAtlasGetTransform(const glhckAtlas *object, glhckTexture *texture, glhckRect *out, short *degrees)
{
float atlasWidth, atlasHeight;
_glhckAtlasArea *packed;
CALL(2, "%p, %p, %p, %p", object, texture, out, degrees);
assert(object && texture && out && degrees);
if (!object->texture)
goto fail;
/* only one texture silly */
if (_glhckAtlasNumTextures(object)==1) {
*degrees = 0;
out->x = out->y = 0.0f;
out->w = out->h = 1.0f;
RET(2, "%d", RETURN_OK);
return RETURN_OK;
}
if (!(packed = _glhckAtlasGetPackedArea(object, texture)))
goto fail;
atlasWidth = object->texture->width;
atlasHeight = object->texture->height;
out->w = packed->x2 / atlasWidth;
out->h = packed->y2 / atlasHeight;
out->x = packed->x1 / atlasWidth;
out->y = packed->y1 / atlasHeight;
*degrees = packed->rotated?-90:0;
RET(2, "%d", RETURN_OK);
return RETURN_OK;
fail:
RET(2, "%d", RETURN_FAIL);
return RETURN_FAIL;
}
/* \brief return coordinates transformed with the packed texture's transform */
GLHCKAPI int glhckAtlasTransformCoordinates(const glhckAtlas *object, glhckTexture *texture, const kmVec2 *in, kmVec2 *out)
{
short degrees;
glhckRect transformed;
kmVec2 center = { 0.5f, 0.5f };
CALL(2, "%p, %p, %p, %p", object, texture, in, out);
/* only one texture */
if (_glhckAtlasNumTextures(object) == 1) {
kmVec2Assign(out, in);
RET(2, "%d", RETURN_OK);
return RETURN_OK;
}
if (glhckAtlasGetTransform(object, texture, &transformed, °rees) != RETURN_OK)
goto fail;
if (kmAlmostEqual(transformed.w, 0.f) || kmAlmostEqual(transformed.h, 0.f))
goto fail;
/* do we need to rotate? */
if (degrees != 0) kmVec2RotateBy(out, in, degrees, ¢er);
else kmVec2Assign(out, in);
/* out */
out->x *= transformed.w;
out->x += transformed.x;
out->y *= transformed.h;
out->y += transformed.y;
RET(2, "%d", RETURN_OK);
return RETURN_OK;
fail:
kmVec2Assign(out, in);
RET(2, "%d", RETURN_FAIL);
return RETURN_FAIL;
}
/* vim: set ts=8 sw=3 tw=0 :*/