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#include "texture.h"
#include "shader.h"
#include "core/log.h"
#include <glad/glad.h>
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
// this file targets OpenGL 4.1 (the maximum macOS exposes). it uses the
// classic bind-based texture API rather than 4.5 Direct State Access
// (glCreateTextures / glTextureStorage2D / glTextureParameteri / glBindTextureUnit),
// none of which exist on macOS. it also hosts the single STB_IMAGE_IMPLEMENTATION
// for the whole build (the Vulkan backend links stbi_loadf from here too).
namespace Donut
{
Texture2D::Texture2D(uint32_t width, uint32_t height)
: m_width(width), m_height(height)
{
m_internal_format = GL_RGBA8;
m_data_format = GL_RGBA;
glGenTextures(1, &m_renderer_id);
glBindTexture(GL_TEXTURE_2D, m_renderer_id);
glTexImage2D(GL_TEXTURE_2D, 0, m_internal_format, m_width, m_height, 0, m_data_format, GL_UNSIGNED_BYTE, nullptr);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
}
Texture2D::Texture2D(const std::string& path)
: m_path(path)
{
m_width = 1;
m_height = 1;
m_internal_format = GL_RGBA8;
m_data_format = GL_RGBA;
glGenTextures(1, &m_renderer_id);
glBindTexture(GL_TEXTURE_2D, m_renderer_id);
glTexImage2D(GL_TEXTURE_2D, 0, m_internal_format, m_width, m_height, 0, m_data_format, GL_UNSIGNED_BYTE, nullptr);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
uint32_t white_pixel = 0xFFFFFFFF;
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_width, m_height, m_data_format, GL_UNSIGNED_BYTE, &white_pixel);
DONUT_INFO("Created default texture (stb_image not available for loading: ", path, ")");
}
Texture2D::~Texture2D()
{
glDeleteTextures(1, &m_renderer_id);
}
auto Texture2D::set_data(void* data, uint32_t size) -> void
{
uint32_t bpp = m_data_format == GL_RGBA ? 4 : 3;
if (size != m_width * m_height * bpp)
{
DONUT_ERROR("Data must be entire texture!");
return;
}
glBindTexture(GL_TEXTURE_2D, m_renderer_id);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_width, m_height, m_data_format, GL_UNSIGNED_BYTE, data);
}
auto Texture2D::bind(uint32_t slot) const -> void
{
glActiveTexture(GL_TEXTURE0 + slot);
glBindTexture(GL_TEXTURE_2D, m_renderer_id);
}
auto Texture2D::bind_as_image(uint32_t slot, bool read_only) const -> void
{
// image load/store is OpenGL 4.2 and unavailable on macOS. guard the
// function pointer so this degrades to a no-op instead of crashing.
if (glBindImageTexture == nullptr)
return;
GLenum access = read_only ? GL_READ_ONLY : GL_WRITE_ONLY;
glBindImageTexture(slot, m_renderer_id, 0, GL_FALSE, 0, access, m_internal_format);
}
CubemapTexture::CubemapTexture(uint32_t width, uint32_t height)
: m_width(width), m_height(height)
{
m_internal_format = GL_RGBA16F;
m_data_format = GL_RGBA;
glGenTextures(1, &m_renderer_id);
glBindTexture(GL_TEXTURE_CUBE_MAP, m_renderer_id);
for (uint32_t i = 0; i < 6; ++i)
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, m_internal_format, m_width, m_height, 0, m_data_format, GL_FLOAT, nullptr);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
}
CubemapTexture::CubemapTexture(const std::string& path)
: m_path(path)
{
m_width = 1024;
m_height = 1024;
m_internal_format = GL_RGBA16F;
m_data_format = GL_RGBA;
glGenTextures(1, &m_renderer_id);
glBindTexture(GL_TEXTURE_CUBE_MAP, m_renderer_id);
for (uint32_t i = 0; i < 6; ++i)
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, m_internal_format, m_width, m_height, 0, m_data_format, GL_FLOAT, nullptr);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
LoadHDRI(path);
}
CubemapTexture::~CubemapTexture()
{
glDeleteTextures(1, &m_renderer_id);
}
auto CubemapTexture::LoadHDRI(const std::string& path) -> void
{
stbi_set_flip_vertically_on_load(true);
int width, height, channels;
float* hdr_data = stbi_loadf(path.c_str(), &width, &height, &channels, 3);
if (!hdr_data)
{
DONUT_ERROR("Failed to load HDRI: {}", path);
float default_sky[6 * 4] =
{
0.5f, 0.7f, 1.0f, 1.0f, // right
0.5f, 0.7f, 1.0f, 1.0f, // left
0.5f, 0.7f, 1.0f, 1.0f, // top
0.5f, 0.7f, 1.0f, 1.0f, // bottom
0.5f, 0.7f, 1.0f, 1.0f, // front
0.5f, 0.7f, 1.0f, 1.0f // back
};
glBindTexture(GL_TEXTURE_CUBE_MAP, m_renderer_id);
for (int i = 0; i < 6; ++i)
glTexSubImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 0, 0, 1, 1, GL_RGBA, GL_FLOAT, &default_sky[i * 4]);
return;
}
convert_equirectangular_to_cubemap(hdr_data, width, height);
stbi_image_free(hdr_data);
DONUT_INFO("Successfully loaded HDRI: {} ({}x{})", path, width, height);
}
auto CubemapTexture::convert_equirectangular_to_cubemap(float* hdr_data, int width, int height) -> void
{
uint32_t capture_fbo, capture_rbo;
glGenFramebuffers(1, &capture_fbo);
glGenRenderbuffers(1, &capture_rbo);
glBindFramebuffer(GL_FRAMEBUFFER, capture_fbo);
glBindRenderbuffer(GL_RENDERBUFFER, capture_rbo);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, m_width, m_height);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, capture_rbo);
uint32_t hdr_texture;
glGenTextures(1, &hdr_texture);
glBindTexture(GL_TEXTURE_2D, hdr_texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_FLOAT, hdr_data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
auto equirect_shader = Shader::create("assets/shaders/EquirectToCubemap.glsl");
if (!equirect_shader)
{
DONUT_ERROR("Failed to create equirectangular to cubemap shader");
return;
}
uint32_t shader_program = equirect_shader->get_renderer_id();
float vertices[] =
{
-1.0f, 1.0f, -1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, 1.0f, -1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f,
1.0f, -1.0f, -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f,
-1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, -1.0f, -1.0f, -1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f
};
uint32_t cube_vao, cube_vbo;
glGenVertexArrays(1, &cube_vao);
glGenBuffers(1, &cube_vbo);
glBindVertexArray(cube_vao);
glBindBuffer(GL_ARRAY_BUFFER, cube_vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
glm::mat4 capture_projection = glm::perspective(glm::radians(90.0f), 1.0f, 0.1f, 10.0f);
glm::mat4 capture_views[] =
{
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3( 1.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3( 0.0f, 1.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3( 0.0f, -1.0f, 0.0f), glm::vec3(0.0f, 0.0f, -1.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3( 0.0f, 0.0f, 1.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3( 0.0f, 0.0f, -1.0f), glm::vec3(0.0f, -1.0f, 0.0f))
};
glUseProgram(shader_program);
glUniform1i(glGetUniformLocation(shader_program, "u_EquirectangularMap"), 0);
// EquirectToCubemap is authored in Slang (row-major); transpose glm's
// column-major matrices on upload (GL_TRUE) to match.
glUniformMatrix4fv(glGetUniformLocation(shader_program, "u_Projection"), 1, GL_TRUE, &capture_projection[0][0]);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, hdr_texture);
glViewport(0, 0, m_width, m_height);
glBindFramebuffer(GL_FRAMEBUFFER, capture_fbo);
for (unsigned int i = 0; i < 6; ++i)
{
glUniformMatrix4fv(glGetUniformLocation(shader_program, "u_View"), 1, GL_TRUE, &capture_views[i][0][0]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, m_renderer_id, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBindVertexArray(cube_vao);
glDrawArrays(GL_TRIANGLES, 0, 36);
}
glBindVertexArray(0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glDeleteVertexArrays(1, &cube_vao);
glDeleteBuffers(1, &cube_vbo);
glDeleteTextures(1, &hdr_texture);
glDeleteFramebuffers(1, &capture_fbo);
glDeleteRenderbuffers(1, &capture_rbo);
}
auto CubemapTexture::set_data(void* data, uint32_t size) -> void
{
DONUT_WARN("set_data not implemented for cubemaps");
}
auto CubemapTexture::bind(uint32_t slot) const -> void
{
glActiveTexture(GL_TEXTURE0 + slot);
glBindTexture(GL_TEXTURE_CUBE_MAP, m_renderer_id);
}
auto CubemapTexture::bind_as_image(uint32_t slot, bool read_only) const -> void
{
if (glBindImageTexture == nullptr)
return;
GLenum access = read_only ? GL_READ_ONLY : GL_WRITE_ONLY;
glBindImageTexture(slot, m_renderer_id, 0, GL_TRUE, 0, access, m_internal_format);
}
auto Texture2D::create(uint32_t width, uint32_t height) -> Ref<Texture2D>
{
return create_ref<Texture2D>(width, height);
}
auto Texture2D::create(const std::string& path) -> Ref<Texture2D>
{
return create_ref<Texture2D>(path);
}
auto CubemapTexture::create(uint32_t width, uint32_t height) -> Ref<CubemapTexture>
{
return create_ref<CubemapTexture>(width, height);
}
auto CubemapTexture::create_from_hdri(const std::string& path) -> Ref<CubemapTexture>
{
return create_ref<CubemapTexture>(path);
}
};
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