Fix font being corrupt with certain sizes, fix image being corrupt if its rgb, fix window resize incorrect size

3 files changed, 25 insertions, 8 deletions

diff --git a/src/graphics/font.c b/src/graphics/font.c
index 2ed54d2..c017755 100644
--- a/src/graphics/font.c
+++ b/src/graphics/font.c
@@ -10,6 +10,11 @@
 
 /* TODO: Test and fix .tcc files */
 
+static unsigned int to_div2_ceil(unsigned int value) {
+    const uint32_t v = value;
+    return v + (v & 1);
+}
+
 int mgl_font_load_from_file(mgl_font *self, const char *filepath, unsigned int character_size) {
     self->texture.id = 0;
 
@@ -47,8 +52,13 @@ int mgl_font_load_from_file(mgl_font *self, const char *filepath, unsigned int c
     /* TODO: Optimize */
     /* Find optimal size for atlas, starting from small to large */
     for(int i = 0; i < 4; ++i) {
-        self->font_atlas.width = (14 + (8 * i)) * self->character_size;
-        self->font_atlas.height = (14 + (8 * i)) * self->character_size;
+        /*
+            This to_div2_ceil is needed because otherwise for character sizes such as 33 which are not divisable by 2
+            causes the font texture to be skewed. I dont know why this happens. Maybe a bug in stbtt?
+            TODO: Figure out why it happens.
+        */
+        self->font_atlas.width = (14 + (8 * i)) * to_div2_ceil(self->character_size);
+        self->font_atlas.height = (14 + (8 * i)) * to_div2_ceil(self->character_size);
         unsigned char *new_atlas = realloc(self->font_atlas.atlas, self->font_atlas.width * self->font_atlas.height);
         if(!new_atlas) {
             fprintf(stderr, "Error: failed to load font %s, error: out of memory\n", filepath);
diff --git a/src/graphics/image.c b/src/graphics/image.c
index 593a3d2..9934b42 100644
--- a/src/graphics/image.c
+++ b/src/graphics/image.c
@@ -1,4 +1,5 @@
 #include "../../include/mgl/graphics/image.h"
+#include <assert.h>
 
 #define STBI_NO_PSD
 #define STBI_NO_TGA
@@ -19,7 +20,8 @@ static mgl_image_format stbi_format_to_mgl_image_format(int stbi_format) {
         case STBI_rgb_alpha:
             return MGL_IMAGE_FORMAT_RGBA;
     }
-    return 0;
+    assert(0);
+    return MGL_IMAGE_FORMAT_RGBA;
 }
 
 static size_t mgl_image_format_num_channels(mgl_image_format image_format) {
@@ -30,7 +32,8 @@ static size_t mgl_image_format_num_channels(mgl_image_format image_format) {
         case MGL_IMAGE_FORMAT_RGB:          return 3;
         case MGL_IMAGE_FORMAT_RGBA:         return 4;
     }
-    return 0;
+    assert(0);
+    return 4;
 }
 
 /* TODO: Ensure texture is power of 2 if the hardware doesn't support non power of two textures */
@@ -41,12 +44,14 @@ int mgl_image_load_from_file(mgl_image *self, const char *filepath) {
     self->height = 0;
     
     int format;
-    self->data = stbi_load(filepath, &self->width, &self->height, &format, 0);
+    /* TODO: format is forced to rgba right now because rgb images cause the image to be skewed (bug) */
+    self->data = stbi_load(filepath, &self->width, &self->height, &format, 4);
     if(!self->data) {
         fprintf(stderr, "Error: failed to load image %s, error: %s\n", filepath, stbi_failure_reason());
         mgl_image_unload(self);
         return -1;
     }
+    format = 4;
     self->format = stbi_format_to_mgl_image_format(format);
 
     return 0;
@@ -60,12 +65,14 @@ int mgl_image_load_from_memory(mgl_image *self, const unsigned char *data, size_
     self->height = 0;
     
     int format;
-    self->data = stbi_load_from_memory(data, size, &self->width, &self->height, &format, 0);
+    /* TODO: format is forced to rgba right now because rgb images cause the image to be skewed (bug) */
+    self->data = stbi_load_from_memory(data, size, &self->width, &self->height, &format, 4);
     if(!self->data) {
         fprintf(stderr, "Error: failed to load image from memory, error: %s\n", stbi_failure_reason());
         mgl_image_unload(self);
         return -1;
     }
+    format = 4;
     self->format = stbi_format_to_mgl_image_format(format);
 
     return 0;
diff --git a/src/graphics/texture.c b/src/graphics/texture.c
index c70c0f9..f6549f1 100644
--- a/src/graphics/texture.c
+++ b/src/graphics/texture.c
@@ -30,8 +30,8 @@ static int mgl_texture_format_to_compressed_opengl_format(mgl_texture_format for
 static int mgl_texture_format_to_source_opengl_format(mgl_texture_format format) {
     switch(format) {
         case MGL_TEXTURE_FORMAT_ALPHA:      return GL_ALPHA;
-        case MGL_TEXTURE_FORMAT_GRAY:       return GL_LUMINANCE8;
-        case MGL_TEXTURE_FORMAT_GRAY_ALPHA: return GL_LUMINANCE8_ALPHA8;
+        case MGL_TEXTURE_FORMAT_GRAY:       return GL_LUMINANCE;
+        case MGL_TEXTURE_FORMAT_GRAY_ALPHA: return GL_LUMINANCE_ALPHA;
         case MGL_TEXTURE_FORMAT_RGB:        return GL_RGB;
         case MGL_TEXTURE_FORMAT_RGBA:       return GL_RGBA;
     }