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#include "texture.h"
struct imv_texture *imv_texture_create(SDL_Renderer *r)
{
struct imv_texture *tex = malloc(sizeof(struct imv_texture));
memset(tex, 0, sizeof(struct imv_texture));
tex->renderer = r;
SDL_RendererInfo ri;
SDL_GetRendererInfo(r, &ri);
tex->chunk_width = ri.max_texture_width != 0 ? ri.max_texture_width : 4096;
tex->chunk_height = ri.max_texture_height != 0 ? ri.max_texture_height : 4096;
return tex;
}
void imv_texture_free(struct imv_texture *tex)
{
if(tex->num_chunks > 0) {
for(int i = 0; i < tex->num_chunks; ++i) {
SDL_DestroyTexture(tex->chunks[i]);
}
free(tex->chunks);
tex->num_chunks = 0;
tex->chunks = NULL;
tex->renderer = NULL;
}
free(tex);
}
int imv_texture_set_image(struct imv_texture *tex, FIBITMAP *image)
{
tex->width = FreeImage_GetWidth(image);
tex->height = FreeImage_GetHeight(image);
/* figure out how many chunks are needed, and create them */
if(tex->num_chunks > 0) {
for(int i = 0; i < tex->num_chunks; ++i) {
SDL_DestroyTexture(tex->chunks[i]);
}
free(tex->chunks);
}
tex->num_chunks_wide = 1 + tex->width / tex->chunk_width;
tex->num_chunks_tall = 1 + tex->height / tex->chunk_height;
tex->last_chunk_width = tex->width % tex->chunk_width;
tex->last_chunk_height = tex->height % tex->chunk_height;
if(tex->last_chunk_width == 0) {
tex->last_chunk_width = tex->chunk_width;
}
if(tex->last_chunk_height == 0) {
tex->last_chunk_height = tex->chunk_height;
}
tex->num_chunks = tex->num_chunks_wide * tex->num_chunks_tall;
tex->chunks = malloc(sizeof(SDL_Texture*) * tex->num_chunks);
int failed_at = -1;
for(int y = 0; y < tex->num_chunks_tall; ++y) {
for(int x = 0; x < tex->num_chunks_wide; ++x) {
const int is_last_h_chunk = (x == tex->num_chunks_wide - 1);
const int is_last_v_chunk = (y == tex->num_chunks_tall - 1);
tex->chunks[x + y * tex->num_chunks_wide] =
SDL_CreateTexture(tex->renderer,
SDL_PIXELFORMAT_ARGB8888,
SDL_TEXTUREACCESS_STATIC,
is_last_h_chunk ? tex->last_chunk_width : tex->chunk_width,
is_last_v_chunk ? tex->last_chunk_height : tex->chunk_height);
SDL_SetTextureBlendMode(tex->chunks[x + y * tex->num_chunks_wide],
SDL_BLENDMODE_BLEND);
if(tex->chunks[x + y * tex->num_chunks_wide] == NULL) {
failed_at = x + y * tex->num_chunks_wide;
break;
}
}
}
if(failed_at != -1) {
for(int i = 0; i <= failed_at; ++i) {
SDL_DestroyTexture(tex->chunks[i]);
}
free(tex->chunks);
tex->num_chunks = 0;
tex->chunks = NULL;
return 1;
}
BYTE* pixels = malloc(4 * tex->width * tex->height);
FreeImage_ConvertToRawBits(pixels, image, 4 * tex->width, 32,
FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK, TRUE);
for(int y = 0; y < tex->num_chunks_tall; ++y) {
for(int x = 0; x < tex->num_chunks_wide; ++x) {
ptrdiff_t offset = 4 * x * tex->chunk_width +
y * 4 * tex->width * tex->chunk_height;
BYTE* addr = pixels + offset;
SDL_UpdateTexture(tex->chunks[x + y * tex->num_chunks_wide],
NULL, addr, 4 * tex->width);
}
}
free(pixels);
return 0;
}
void imv_texture_draw(struct imv_texture *tex, int bx, int by, double scale)
{
int offset_x = 0;
int offset_y = 0;
for(int y = 0; y < tex->num_chunks_tall; ++y) {
for(int x = 0; x < tex->num_chunks_wide; ++x) {
int img_w, img_h;
SDL_QueryTexture(tex->chunks[x + y * tex->num_chunks_wide], NULL, NULL,
&img_w, &img_h);
SDL_Rect view_area = {
bx + offset_x,
by + offset_y,
img_w * scale,
img_h * scale
};
SDL_RenderCopy(tex->renderer,
tex->chunks[x + y * tex->num_chunks_wide], NULL, &view_area);
offset_x += tex->chunk_width * scale;
}
offset_x = 0;
offset_y += tex->chunk_height * scale;
}
}
/* vim:set ts=2 sts=2 sw=2 et: */
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