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#include "rendering.h"
#include <glad.h>
#include <cstring>
#include "cglm/types.h"
#include "utils.h"
bool wayc_image_init(texture_t* texture, image_type_e type,
image_format_e format, u32 width, u32 height) {
wayc_notnull(texture);
glCreateTextures(type, 1, texture);
if (*texture == 0) return false;
switch (type) {
case IMAGE_TYPE_2D:
// TODO: add error checking
glTextureStorage2D(*texture, 1, format, width, height);
break;
default:
break;
}
return true;
}
bool wayc_image_upload(texture_t texture, ivec2 offset, u32 width, u32 height,
image_type_e type, image_format_e format,
image_data_type_e data_type, i32 alignment,
const u8* data) {
wayc_notnull(data);
glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
switch (type) {
case IMAGE_TYPE_2D:
// TODO: add error checking
glTextureSubImage2D(texture, 0, offset[0], offset[1], width, height,
format, data_type, data);
break;
default:
break;
}
return true;
}
void wayc_image_use(texture_t texture, u32 slot) {
glBindTextureUnit(slot, texture);
}
void wayc_image_deinit(texture_t* texture) {
wayc_notnull(texture);
glDeleteTextures(1, texture);
}
bool wayc_sampler_init(sampler_t* sampler, sample_filter_e filter,
sample_wrap_e wrap) {
wayc_notnull(sampler);
glCreateSamplers(1, sampler);
if (*sampler == 0) return false;
glSamplerParameteri(*sampler, GL_TEXTURE_MIN_FILTER, filter);
glSamplerParameteri(*sampler, GL_TEXTURE_MAG_FILTER, filter);
glSamplerParameteri(*sampler, GL_TEXTURE_WRAP_S, wrap);
glSamplerParameteri(*sampler, GL_TEXTURE_WRAP_T, wrap);
return true;
}
void wayc_sampler_use(sampler_t sampler, u32 slot) {
glBindSampler(slot, sampler);
}
void wayc_sampler_deinit(sampler_t* sampler) { glDeleteSamplers(1, sampler); }
bool wayc_atlas_init(atlas_s* atlas, image_format_e format, u32 width,
u32 height) {
wayc_notnull(atlas);
memset(atlas, 0, sizeof(*atlas));
bool success = false;
texture_t texture;
bool ok = wayc_image_init(&texture, IMAGE_TYPE_2D, format, width, height);
if (!ok) return false;
wayc_defer_cond(wayc_image_deinit(&texture);, success, true);
sampler_t sampler;
ok = wayc_sampler_init(&sampler, SAMPLE_FILTER_NEAREST,
SAMPLE_WRAP_CLAMP_TO_EDGE);
if (!ok) return false;
atlas->texture = texture;
atlas->sampler = sampler;
atlas->width = width;
atlas->height = height;
success = true;
return true;
}
void wayc_atlas_use(atlas_s* atlas, u32 slot) {
wayc_image_use(atlas->texture, slot);
wayc_sampler_use(atlas->sampler, slot);
}
bool wayc_atlas_set(atlas_s* atlas, image_data_type_e data_type, ivec2 offset,
u32 width, u32 height, i32 alignment, const u8* data) {
wayc_notnull(atlas);
wayc_notnull(data);
u32 final_x = offset[0] + width;
u32 final_y = offset[1] + height;
if (final_x > atlas->width || final_y > atlas->height) return false;
wayc_image_upload(atlas->texture, offset, width, height, IMAGE_TYPE_2D,
atlas->format, data_type, alignment, data);
return true;
}
void wayc_atlas_deinit(atlas_s* atlas) {
wayc_notnull(atlas);
wayc_sampler_deinit(&atlas->sampler);
wayc_image_deinit(&atlas->texture);
}
static inline void wayc_atlas_packer_wrap(struct atlas_packer_s* packer) {
WAYC_X(packer->cursor) = 0;
WAYC_Y(packer->cursor) += packer->row_height;
packer->row_height = 0;
}
bool wayc_atlas_packer_allocate(struct atlas_packer_s* packer, u32 width,
u32 height, ivec2 out) {
wayc_notnull(packer);
struct atlas_s* atlas = packer->atlas;
wayc_notnull(atlas);
if (width > atlas->width || height > atlas->height) return false;
if (WAYC_X(packer->cursor) + width > atlas->width)
wayc_atlas_packer_wrap(packer);
if (WAYC_Y(packer->cursor) + height > atlas->height) return false;
glm_ivec2_copy(packer->cursor, out);
WAYC_X(packer->cursor) += width;
packer->row_height = wayc_max(packer->row_height, height);
return true;
}
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