pictrue.cpp

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#include "picture.h"
#define STB_IMAGE_IMPLEMENTATION
#include "stb/stb_image.h"
 
namespace dyno {
    // Simple helper function to load an image into a OpenGL texture with common
    // settings
    bool Picture::LoadTextureFromFile(const char *filename, 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(filename, &image_width, &image_height, NULL, 4);
        if (image_data == NULL) 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;
    }
}