Load textures directly via stb_image instead of SOIL2

Author: kblaschke

src/libprojectM/Renderer/TextureManager.cpp

@@ -5,12 +5,13 @@
 #include "Renderer/MilkdropNoise.hpp"
 #include "Renderer/Texture.hpp"
 
+#include <Logging.hpp>
 #include <Utils.hpp>
 
-#include <Logging.hpp>
-#include <SOIL2/SOIL2.h>
+#include <SOIL2/stb_image.h>
 
 #include <algorithm>
+#include <cstdlib>
 #include <memory>
 #include <random>
 #include <vector>
@@ -70,24 +71,27 @@ void TextureManager::Preload()
 
     int width{};
     int height{};
+    int channels{};
 
-    unsigned int tex = SOIL_load_OGL_texture_from_memory(
-        M_data,
-        M_bytes,
-        SOIL_LOAD_AUTO,
-        SOIL_CREATE_NEW_ID,
-        SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MULTIPLY_ALPHA);
+    {
+        std::unique_ptr<stbi_uc, decltype(&free)> const imageData(stbi_load_from_memory(M_data, M_bytes, &width, &height, &channels, 4), free);
 
-    m_textures["idlem"] = std::make_shared<Texture>("idlem", tex, GL_TEXTURE_2D, width, height, false);;
+        if (imageData.get() != nullptr)
+        {
+            auto format = TextureFormatFromChannels(channels);
+            m_textures["idlem"] = std::make_shared<Texture>("idlem", reinterpret_cast<const void*>(imageData.get()), GL_TEXTURE_2D, width, height, 0, format, format, GL_UNSIGNED_BYTE, false);
+        }
+    }
 
-    tex = SOIL_load_OGL_texture_from_memory(
-        headphones_data,
-        headphones_bytes,
-        SOIL_LOAD_AUTO,
-        SOIL_CREATE_NEW_ID,
-        SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_MULTIPLY_ALPHA);
+    {
+        std::unique_ptr<stbi_uc, decltype(&free)> const imageData(stbi_load_from_memory(headphones_data, headphones_bytes, &width, &height, &channels, 4), free);
 
-    m_textures["idleheadphones"] = std::make_shared<Texture>("idleheadphones", tex, GL_TEXTURE_2D, width, height, false);;
+        if (imageData.get() != nullptr)
+        {
+            auto format = TextureFormatFromChannels(channels);
+            m_textures["idleheadphones"] = std::make_shared<Texture>("idleheadphones", reinterpret_cast<const void*>(imageData.get()), GL_TEXTURE_2D, width, height, 0, format, format, GL_UNSIGNED_BYTE, false);
+        }
+    }
 
     // Noise textures
     m_textures["noise_lq_lite"] = MilkdropNoise::LowQualityLite();
@@ -184,7 +188,8 @@ auto TextureManager::TryLoadingTexture(const std::string& name) -> TextureSample
         if (texture)
         {
             LOG_DEBUG("[TextureManager] Loaded texture \"" + unqualifiedName + "\" from file: " + file.filePath);
-            return {texture, m_samplers.at({wrapMode, filterMode}), name, unqualifiedName};;
+            return {texture, m_samplers.at({wrapMode, filterMode}), name, unqualifiedName};
+            ;
         }
     }
 
@@ -207,30 +212,20 @@ auto TextureManager::LoadTexture(const ScannedFile& file) -> std::shared_ptr<Tex
     int height{};
     int channels{};
 
-    std::unique_ptr<unsigned char, decltype(&SOIL_free_image_data)> imageData(SOIL_load_image(file.filePath.c_str(), &width, &height, &channels, SOIL_LOAD_RGBA), SOIL_free_image_data);
+    std::unique_ptr<stbi_uc, decltype(&free)> imageData(stbi_load(file.filePath.c_str(), &width, &height, &channels, 4), free);
 
-    if (imageData == nullptr)
+    if (imageData.get() == nullptr)
     {
         LOG_DEBUG("[TextureManager] Failed to decode image data.");
         return {};
     }
 
-    unsigned int const tex = SOIL_create_OGL_texture(
-        imageData.get(),
-        &width, &height, SOIL_LOAD_RGBA,
-        SOIL_CREATE_NEW_ID,
-        SOIL_FLAG_MULTIPLY_ALPHA);
+    auto format = TextureFormatFromChannels(channels);
+    auto newTexture = std::make_shared<Texture>(unqualifiedName, reinterpret_cast<const void*>(imageData.get()), GL_TEXTURE_2D, width, height, 0, format, format, GL_UNSIGNED_BYTE, true);
 
     imageData.reset();
 
-    if (tex == 0)
-    {
-        LOG_DEBUG("[TextureManager] Failed to create GPU texture from image data.");
-        return {};
-    }
-
-    uint32_t memoryBytes = width * height * 4; // RGBA, unsigned byte color channels.
-    auto newTexture = std::make_shared<Texture>(unqualifiedName, tex, GL_TEXTURE_2D, width, height, true);
+    uint32_t const memoryBytes = width * height * 4; // RGBA, unsigned byte color channels.
     m_textures[file.lowerCaseBaseName] = newTexture;
     m_textureStats.insert({file.lowerCaseBaseName, {memoryBytes}});
 
@@ -369,5 +364,22 @@ void TextureManager::ScanTextures()
     }
 }
 
+uint32_t TextureManager::TextureFormatFromChannels(int channels)
+{
+    switch (channels)
+    {
+        case 1:
+            return GL_RED;
+        case 2:
+            return GL_RG;
+        case 3:
+            return GL_RGB;
+        case 4:
+            return GL_RGBA;
+        default:
+            return 0;
+    }
+}
+
 } // namespace Renderer
 } // namespace libprojectM

src/libprojectM/Renderer/TextureManager.hpp

@@ -90,6 +90,8 @@ class TextureManager
 
     void ScanTextures();
 
+    static uint32_t TextureFormatFromChannels(int channels);
+
     std::vector<std::string> m_textureSearchPaths;  //!< Search paths to scan for textures.
     std::string m_currentPresetDir;                 //!< Path of the current preset to add to the search list.
     std::vector<ScannedFile> m_scannedTextureFiles; //!< The cached list with scanned texture files.