From 0243be4eebe488b449742474d4301a39f00ac67f Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Mon, 14 Apr 2025 23:13:50 +0200
Subject: Add scaling option for texture, allow nearest neighbour scaling

---
 src/graphics/texture.c | 41 +++++++++++++++++++++++++++--------------
 1 file changed, 27 insertions(+), 14 deletions(-)

(limited to 'src/graphics')

diff --git a/src/graphics/texture.c b/src/graphics/texture.c
index 9a13314..d33bf58 100644
--- a/src/graphics/texture.c
+++ b/src/graphics/texture.c
@@ -70,7 +70,7 @@ int mgl_texture_init(mgl_texture *self) {
     self->max_width = 0;
     self->max_height = 0;
     self->pixel_coordinates = false;
-    self->mipmap = false;
+    self->scale_type = MGL_TEXTURE_SCALE_LINEAR;
     self->owned = true;
 
     mgl_context *context = mgl_get_context();
@@ -96,7 +96,7 @@ int mgl_texture_init_reference_existing_gl_texture(mgl_texture *self, unsigned i
     self->max_width = 0;
     self->max_height = 0;
     self->pixel_coordinates = reference_options && reference_options->pixel_coordinates;
-    self->mipmap = false;
+    self->scale_type = reference_options ? reference_options->scale_type : MGL_TEXTURE_SCALE_LINEAR;
     self->owned = false;
 
     gl_get_texture_size(self->id, &self->width, &self->height);
@@ -137,7 +137,7 @@ int mgl_texture_load_from_memory(mgl_texture *self, const unsigned char *data, i
     self->height = height;
     self->format = mgl_image_format_to_mgl_texture_format(format);
     self->pixel_coordinates = load_options && load_options->pixel_coordinates;
-    self->mipmap = load_options && load_options->mipmap && context->gl.glGenerateMipmap; /* TODO: Check if glGenerateMipmap is actually available */
+    self->scale_type = load_options ? load_options->scale_type : MGL_TEXTURE_SCALE_LINEAR; /* TODO: Check if glGenerateMipmap is actually available */
 
     int opengl_texture_format = mgl_texture_format_to_opengl_format(self->format);
     if(load_options && load_options->compressed)
@@ -147,13 +147,28 @@ int mgl_texture_load_from_memory(mgl_texture *self, const unsigned char *data, i
     context->gl.glTexImage2D(GL_TEXTURE_2D, 0, opengl_texture_format, self->width, self->height, 0, mgl_texture_format_to_source_opengl_format(self->format), GL_UNSIGNED_BYTE, data);
     context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-    if(self->mipmap) {
-        context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-        context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
-        context->gl.glGenerateMipmap(GL_TEXTURE_2D);
-    } else {
-        context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-        context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    switch(self->scale_type) {
+        default:
+        case MGL_TEXTURE_SCALE_LINEAR: {
+            context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+            context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+            break;
+        }
+        case MGL_TEXTURE_SCALE_NEAREST: {
+            context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+            context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+            break;
+        }
+        case MGL_TEXTURE_SCALE_LINEAR_MIPMAP: {
+            context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+            if(context->gl.glGenerateMipmap) {
+                context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+                context->gl.glGenerateMipmap(GL_TEXTURE_2D);
+            } else {
+                context->gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+            }
+            break;
+        }
     }
     context->gl.glBindTexture(GL_TEXTURE_2D, 0);
 
@@ -168,9 +183,8 @@ int mgl_texture_update(mgl_texture *self, const unsigned char *data, int offset_
     context->gl.glBindTexture(GL_TEXTURE_2D, self->id);
     const mgl_texture_format texture_format = mgl_image_format_to_mgl_texture_format(format);
     context->gl.glTexSubImage2D(GL_TEXTURE_2D, 0, offset_x, offset_y, width, height, mgl_texture_format_to_source_opengl_format(texture_format), GL_UNSIGNED_BYTE, data);
-    if(self->mipmap) {
+    if(self->scale_type == MGL_TEXTURE_SCALE_LINEAR_MIPMAP && context->gl.glGenerateMipmap)
         context->gl.glGenerateMipmap(GL_TEXTURE_2D);
-    }
     context->gl.glBindTexture(GL_TEXTURE_2D, 0);
     return 0;
 }
@@ -193,9 +207,8 @@ int mgl_texture_resize(mgl_texture *self, int new_width, int new_height, const m
     mgl_context *context = mgl_get_context();
     context->gl.glBindTexture(GL_TEXTURE_2D, self->id);
     context->gl.glTexImage2D(GL_TEXTURE_2D, 0, opengl_texture_format, self->width, self->height, 0, mgl_texture_format_to_source_opengl_format(self->format), GL_UNSIGNED_BYTE, NULL);
-    if(self->mipmap) {
+    if(self->scale_type == MGL_TEXTURE_SCALE_LINEAR_MIPMAP && context->gl.glGenerateMipmap)
         context->gl.glGenerateMipmap(GL_TEXTURE_2D);
-    }
     context->gl.glBindTexture(GL_TEXTURE_2D, 0);
     return 0;
 }
-- 
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