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