Change from callback to window poll

1 files changed, 67 insertions, 0 deletions

diff --git a/src/graphics/image.c b/src/graphics/image.c
new file mode 100644
index 0000000..430f03a
--- /dev/null
+++ b/src/graphics/image.c
@@ -0,0 +1,67 @@
+#include "../../include/mgl/graphics/image.h"
+
+#define STBI_NO_PSD
+#define STBI_NO_TGA
+#define STBI_NO_HDR
+#define STBI_NO_PIC
+#define STBI_NO_PNM
+#define STB_IMAGE_IMPLEMENTATION
+#include "../../external/stb_image.h"
+
+static mgl_image_format stbi_format_to_mgl_image_format(int stbi_format) {
+    switch(stbi_format) {
+        case STBI_grey:
+            return MGL_IMAGE_FORMAT_GRAY;
+        case STBI_grey_alpha:
+            return MGL_IMAGE_FORMAT_GRAY_ALPHA;
+        case STBI_rgb:
+            return MGL_IMAGE_FORMAT_RGB;
+        case STBI_rgb_alpha:
+            return MGL_IMAGE_FORMAT_RGBA;
+    }
+    return 0;
+}
+
+static size_t mgl_image_format_num_channels(mgl_image_format image_format) {
+    switch(image_format) {
+        case MGL_IMAGE_FORMAT_ALPHA:        return 1;
+        case MGL_IMAGE_FORMAT_GRAY:         return 1;
+        case MGL_IMAGE_FORMAT_GRAY_ALPHA:   return 2;
+        case MGL_IMAGE_FORMAT_RGB:          return 3;
+        case MGL_IMAGE_FORMAT_RGBA:         return 4;
+    }
+    return 0;
+}
+
+/* TODO: Ensure texture is power of 2 if the hardware doesn't support non power of two textures */
+/* TODO: Verify if source format should always be 4 components (RGBA) because apparently if its another format then opengl will internally convert it to RGBA */
+int mgl_image_load_from_file(mgl_image *self, const char *filepath) {
+    self->data = NULL;
+    self->width = 0;
+    self->height = 0;
+    
+    int format;
+    self->data = stbi_load(filepath, &self->width, &self->height, &format, 0);
+    if(!self->data) {
+        fprintf(stderr, "Error: failed to load image %s, error: %s\n", filepath, stbi_failure_reason());
+        mgl_image_unload(self);
+        return -1;
+    }
+    self->format = stbi_format_to_mgl_image_format(format);
+
+    return 0;
+}
+
+void mgl_image_unload(mgl_image *self) {
+    if(self->data) {
+        stbi_image_free(self->data);
+        self->data = NULL;
+    }
+    self->width = 0;
+    self->height = 0;
+    self->format = 0;
+}
+
+size_t mgl_image_get_size(mgl_image *self) {
+    return (size_t)self->width * (size_t)self->height * mgl_image_format_num_channels(self->format);
+}