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textures

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Brett 2023-12-17 19:37:11 -05:00
parent 6a5b06ac70
commit e04f4b555d
5 changed files with 8591 additions and 103 deletions
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2
include/blt/gfx/gl_includes.h
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@ -12,7 +12,7 @@
#ifndef __EMSCRIPTEN__
#include <glad/gl.h>
#else
#include <GLES2/gl2.h>
#include <GLES2/gl2.h>
#include <emscripten.h>
#define GL_GLEXT_PROTOTYPES
#define EGL_EGLEXT_PROTOTYPES

7986
include/blt/gfx/stb/stb_image.h
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429
include/blt/gfx/stb/stb_perlin.h
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226
include/blt/gfx/texture.h
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@ -19,168 +19,190 @@
#ifndef BLT_TEXTURE_H
#define BLT_TEXTURE_H
#ifdef __EMSCRIPTEN__
#else
#endif
#include <blt/gfx/gl_includes.h>
#include <blt/gfx/stb/stb_image.h>
#include <blt/std/logging.h>
#include <string>
#include <vector>
#include <utility>
namespace blt::gfx
{
class file_texture {
class texture_file;
class texture_data
{
friend texture_file;
private:
std::string m_Name;
std::string m_Path;
int width = 0, height = 0, channels = 0;
unsigned char* m_Data = nullptr;
unsigned char* m_data = nullptr;
int m_width = 0, m_height = 0, m_channels = 0;
public:
texture_data(unsigned char* data, int width, int height, int channels):
m_data(data), m_width(width), m_height(height), m_channels(channels)
{}
texture_data(int width, int height, int channels = 4): m_width(width), m_height(height), m_channels(channels)
{
m_data = static_cast<unsigned char*>(STBI_MALLOC(width * height * channels));
}
texture_data() = default;
unsigned char* data()
{
return m_data;
}
[[nodiscard]] unsigned char* data() const
{
return m_data;
}
[[nodiscard]] int width() const
{
return m_width;
}
[[nodiscard]] int height() const
{
return m_height;
}
[[nodiscard]] int channels() const
{
return m_channels;
}
~texture_data()
{
STBI_FREE(m_data);
}
};
class texture_file
{
private:
std::string m_name;
std::string m_path;
mutable texture_data m_texture;
public:
/**
* @param path path to the texture file
* @param name reference name for this texture. If empty the texture will use path as its identifier
*/
explicit file_texture(const std::string& path, const std::string& name = ""):
m_Name(name.empty() ? path : name), m_Path(path) {}
explicit texture_file(const std::string& path, const std::string& name = "");
static file_texture* load(file_texture*& texture) {
// we want to load every texture as if it has transparency,
// otherwise textures won't be correctly resized and loaded to the gpu
constexpr int channel_count = 4;
texture->m_Data = stbi_load(
texture->m_Path.c_str(), &texture->width, &texture->height,
&texture->channels, channel_count
);
texture->channels = channel_count;
return texture;
texture_file& resize(int target_width, int target_height);
texture_data& texture() const
{
return m_texture;
}
static file_texture* resize(
file_texture* texture, int target_width, int target_height
) {
if (target_width == texture->width && target_height == texture->height)
return texture;
// since we will be replacing the loaded data pointer, is it wise to use the allocator
// that matches with what stb image uses, which is malloc, since we unload with stbi_image_free -> (free)
auto* output_Data = (unsigned char*) malloc(
target_width * target_height * texture->channels
);
// resize the texture
if (stbir_resize_uint8(
// input
texture->m_Data, texture->width, texture->height, 0,
// output
output_Data, target_width, target_height, 0,
// channels
texture->channels
)) {
BLT_WARN("Error resizing block texture image!");
}
// free up the old data
stbi_image_free(texture->m_Data);
texture->m_Data = output_Data;
texture->width = target_width;
texture->height = target_height;
return texture;
[[nodiscard]] int channels() const
{
return m_texture.m_channels;
}
unsigned char* data() {
return m_Data;
[[nodiscard]] int width() const
{
return m_texture.m_width;
}
[[nodiscard]] int getChannels() const {
return channels;
[[nodiscard]] int height() const
{
return m_texture.m_height;
}
[[nodiscard]] int getWidth() const {
return width;
}
[[nodiscard]] int getHeight() const {
return height;
}
[[nodiscard]] const std::string& getName() {
return m_Name;
}
~file_texture() {
stbi_image_free(m_Data);
[[nodiscard]] const std::string& getName() const
{
return m_name;
}
};
struct gl_texture {
struct texture_gl
{
protected:
unsigned int textureID = 0;
GLint textureBindType;
GLint textureColorMode;
int m_width, m_height;
gl_texture(
texture_gl(
int width, int height, GLint bind_type = GL_TEXTURE_2D,
GLint color_mode = GL_RGBA
):
textureBindType(bind_type), textureColorMode(color_mode), m_width(width),
m_height(height) {
m_height(height)
{
glGenTextures(1, &textureID);
}
public:
inline void bind() const {
inline void bind() const
{
glBindTexture(textureBindType, textureID);
}
inline void unbind() const {
inline void unbind() const
{
glBindTexture(textureBindType, 0);
}
void setDefaults() const {
void setDefaults() const
{
bind();
glTexParameteri(textureBindType, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(textureBindType, GL_TEXTURE_WRAP_T, GL_REPEAT);
// nearest preserves the pixely look
glTexParameteri(textureBindType, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
glTexParameteri(textureBindType, GL_TEXTURE_MAG_FILTER, GL_NEAREST_MIPMAP_LINEAR);
#ifdef GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT
// Anisotropy helps preserve textures at oblique angles
float a = 0;
glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &a);
glTexParameterf(textureBindType, GL_TEXTURE_MAX_ANISOTROPY_EXT, a);
#endif
unbind();
}
inline void generateMipmaps() const {
inline void generateMipmaps() const
{
// it's a little inefficient binding and unbinding for these small calls, they really should be done in the constructor or data upload
bind();
glGenerateMipmap(textureBindType);
unbind();
}
[[nodiscard]] inline unsigned int getTextureID() const {
[[nodiscard]] inline unsigned int getTextureID() const
{
return textureID;
}
virtual ~gl_texture() {
virtual ~texture_gl()
{
glDeleteTextures(1, &textureID);
}
};
struct gl_texture2D : public gl_texture {
struct texture_gl2D : public texture_gl
{
public:
gl_texture2D(int width, int height, GLint colorMode = GL_RGBA):
gl_texture(width, height, GL_TEXTURE_2D, colorMode) {
texture_gl2D(int width, int height, GLint colorMode = GL_RGBA):
texture_gl(width, height, GL_TEXTURE_2D, colorMode)
{
bind();
// TODO:
const int MIPMAP_LEVELS = 4;
glTexStorage2D(
textureBindType, std::stoi(fp::settings::get("MIPMAP_LEVELS")), colorMode,
textureBindType, MIPMAP_LEVELS, colorMode,
width, height
);
}
void upload(
void* data, GLint dataColorMode = GL_RGBA, int level = 0, int x_offset = 0,
int y_offset = 0, int sub_width = -1,
int sub_height = -1
) const {
void upload(void* data, GLint dataColorMode = GL_RGBA, int level = 0, int x_offset = 0, int y_offset = 0, int sub_width = -1,
int sub_height = -1) const
{
if (sub_width < 0)
sub_width = m_width;
if (sub_height < 0)
@ -193,14 +215,16 @@ namespace blt::gfx
unbind();
}
void upload(file_texture* texture) const {
upload(texture->data(), texture->getChannels() == 4 ? GL_RGBA : GL_RGB);
void upload(const texture_file& tex_file) const
{
upload(tex_file.texture().data(), tex_file.channels() == 4 ? GL_RGBA : GL_RGB, 0, 0, 0, tex_file.width(), tex_file.height());
}
/**
* Resizes the internal memory for the texture but does NOT resize the texture image stored
*/
inline void resize(int width, int height) {
inline void resize(int width, int height)
{
m_width = width;
m_height = height;
bind();
@ -209,23 +233,23 @@ namespace blt::gfx
}
};
struct gl_texture2D_array : public gl_texture {
struct gl_texture2D_array : public texture_gl
{
protected:
int m_layers;
public:
gl_texture2D_array(int width, int height, int layers, GLint colorMode = GL_RGBA8):
gl_texture(width, height, GL_TEXTURE_2D_ARRAY, colorMode), m_layers(layers) {
texture_gl(width, height, GL_TEXTURE_2D_ARRAY, colorMode), m_layers(layers)
{
bind();
// 6+ mipmaps is about where I stop noticing any difference (size is 4x4 pixels, so that makes sense)
glTexStorage3D(textureBindType, 6, colorMode, width, height, layers);
BLT_DEBUG("Creating 2D Texture Array with ID: %d", textureID);
}
void upload(
void* data, int index, GLint dataColorMode = GL_RGBA, int level = 0,
int x_offset = 0, int y_offset = 0, int sub_width = -1,
int sub_height = -1
) const {
void upload(void* data, int index, GLint dataColorMode = GL_RGBA, int level = 0, int x_offset = 0, int y_offset = 0, int sub_width = -1,
int sub_height = -1) const
{
if (sub_width < 0)
sub_width = m_width;
if (sub_height < 0)
@ -239,7 +263,8 @@ namespace blt::gfx
}
};
class gl_buffer_texture : public gl_texture2D {
class gl_buffer_texture : public texture_gl2D
{
private:
public:
@ -247,7 +272,8 @@ namespace blt::gfx
gl_buffer_texture(
int width, int height, GLint format = GL_RGB32F,
GLint colorAttachment = GL_COLOR_ATTACHMENT0
): gl_texture2D(width, height, format) {
): texture_gl2D(width, height, format)
{
bind();
// no mipmaping and no interpolation to position textures!
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

51
src/blt/gfx/texture.cpp
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@ -15,3 +15,54 @@
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#define STB_IMAGE_IMPLEMENTATION
#define STB_IMAGE_RESIZE_IMPLEMENTATION
#define STB_IMAGE_WRITE_IMPLEMENTATION
#define STB_PERLIN_IMPLEMENTATION
#include <blt/gfx/stb/stb_image_write.h>
#include <blt/gfx/stb/stb_image_resize2.h>
#include <blt/gfx/stb/stb_perlin.h>
#include <blt/gfx/texture.h>
blt::gfx::texture_file::texture_file(const std::string& path, const std::string& name): m_name(name.empty() ? path : name), m_path(path)
{
m_texture.m_data = stbi_load(
m_path.c_str(),
reinterpret_cast<int*>(&m_texture.m_width), reinterpret_cast<int*>(&m_texture.m_height),
reinterpret_cast<int*>(&m_texture.m_channels),
0
);
}
blt::gfx::texture_file& blt::gfx::texture_file::resize(int target_width, int target_height)
{
if (target_width == m_texture.width() && target_height == m_texture.height())
return *this;
// since we will be replacing the loaded data pointer, is it wise to use the allocator
// that matches with what stb image uses, which is malloc, since we unload with stbi_image_free -> (free)
auto* output_Data = (unsigned char*) malloc(
target_width * target_height * m_texture.channels()
);
// resize the texture
if (stbir_resize_uint8_linear(
// input
m_texture.m_data, m_texture.width(), m_texture.height(), 0,
// output
output_Data, target_width, target_height, 0,
// channels
static_cast<stbir_pixel_layout>(m_texture.channels())
))
{
BLT_WARN("Error resizing block texture image!");
}
// free up the old data
stbi_image_free(m_texture.m_data);
m_texture.m_data = output_Data;
m_texture.m_width = target_width;
m_texture.m_height = target_height;
return *this;
}