Version initiale du logiciel. Développement commencé le 06/01/2026, en reprenant certaines parties/idées de miniDart, que j'ai écrit quelques années plus tôt

gl_helpers.cxx

@@ -0,0 +1,85 @@
+/* gl_helpers.cpp */
+
+// Eric Bachard   2024/11/05  17h01
+#include "imgui.h"
+#include "imgui_impl_sdl3.h"
+#include "imgui_impl_opengl3.h"
+#include <stdio.h>
+#include <SDL3/SDL.h>
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+#include <SDL_opengles2.h>
+#else
+#include <SDL3/SDL_opengl.h>
+#endif
+
+#include <iostream>
+
+#define _CRT_SECURE_NO_WARNINGS
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+#include "gl_helpers.h"
+
+// Simple helper function to load an image into a OpenGL texture with common settings
+bool LoadTextureFromMemory(const void* data, size_t data_size, GLuint* out_texture, int* out_width, int* out_height)
+{
+    // Load from file
+    int image_width = 0;
+    int image_height = 0;
+    unsigned char* image_data = stbi_load_from_memory((const unsigned char*)data, (int)data_size, &image_width, &image_height, NULL, 4);
+
+    if (image_data == NULL)
+    {
+        std::cout << "image_data == NULL" << "\n";
+        return false;
+    }
+
+    // Create a OpenGL texture identifier
+    GLuint image_texture;
+    glGenTextures(1, &image_texture);
+    glBindTexture(GL_TEXTURE_2D, image_texture);
+
+    // Setup filtering parameters for display
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+    // Upload pixels into texture
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image_width, image_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image_data);
+    stbi_image_free(image_data);
+
+    *out_texture = image_texture;
+    *out_width = image_width;
+    *out_height = image_height;
+
+    return true;
+}
+
+// Open and read a file, then forward to LoadTextureFromMemory()
+bool LoadTextureFromFile(const char* file_name, GLuint* out_texture, int* out_width, int* out_height)
+{
+    FILE* f = fopen(file_name, "rb");
+
+    if (f == NULL)
+        return false;
+
+    fseek(f, 0, SEEK_END);
+    size_t file_size = (size_t)ftell(f);
+
+    if (file_size < 0)
+        return false;
+
+    fseek(f, 0, SEEK_SET);
+    void* file_data = IM_ALLOC(file_size);
+    unsigned int taille_image = fread(file_data, 1, file_size, f);
+
+    if (0 >= taille_image)
+    {
+        fprintf(stdout, "Erreur avec le chargement de l'image en mémoire");
+        return false;
+    }
+    bool ret = LoadTextureFromMemory(file_data, file_size, out_texture, out_width, out_height);
+    IM_FREE(file_data);
+
+    return ret;
+}
+