From a4c67096a3afd74ec9ceff9260cff9ad0336b208 Mon Sep 17 00:00:00 2001
From: onelin <oscar@nelin.dk>
Date: Thu, 13 Nov 2025 09:48:56 +0100
Subject: Use Direct State Access

DSA (Direct State Access) is apparently a more modern way of using
OpenGL, since version 4.5.
---
 src/rendering.c | 54 ++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 42 insertions(+), 12 deletions(-)

(limited to 'src/rendering.c')

diff --git a/src/rendering.c b/src/rendering.c
index 4db3308..a37de58 100644
--- a/src/rendering.c
+++ b/src/rendering.c
@@ -476,8 +476,7 @@ void render_present(Window* w) {
 
       gl->UseProgram(o->shader.program);
       // TODO: Use texture atlas
-      gl->ActiveTexture(GL_TEXTURE0);
-      gl->BindTexture(GL_TEXTURE_2D, o->texture);
+      gl->BindTextureUnit(0, o->texture);
 
       {
         mat4 model = GLM_MAT4_IDENTITY_INIT;
@@ -671,12 +670,23 @@ Texture createTextureFromImageData(unsigned char* image_data, i32 width, i32 hei
   }
 
   const GladGLContext* gl = w->context;
-
-  gl->GenTextures(1, &t.id);
-  gl->BindTexture(GL_TEXTURE_2D, t.id);
   u32 err = gl->GetError();
   if (err) {
-    ERROR("Failed to bind texture from image data!");
+    ERROR("There's already something wrong!");
+  }
+
+  gl->CreateTextures(GL_TEXTURE_2D, 1, &t.id);
+  err = gl->GetError();
+  if (err) {
+    if (err == GL_INVALID_ENUM) {
+      ERROR("Failed to create texture! GL_INVALID_ENUM");
+    }
+    else if (err == GL_INVALID_VALUE) {
+      ERROR("Failed to create texture! GL_INVALID_VALUE");
+    }
+    else {
+      ERROR("Failed to create texture!");
+    }
   }
 
   /* TODO: Support more formats than rgb and rgba, such as gray, gray/alpha, etc.*/
@@ -685,13 +695,33 @@ Texture createTextureFromImageData(unsigned char* image_data, i32 width, i32 hei
 
   /* TODO: Don't force internal format to RGB */
 
-  gl->TexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, format,
-                 GL_UNSIGNED_BYTE, image_data);
-
-  gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  gl->TextureStorage2D(t.id, 1, GL_RGB8, width, height);
+  err = gl->GetError();
+  if (err) {
+    char* errstr = NULL;
+    switch (err) {
+      case GL_INVALID_ENUM:
+        errstr = "GL_INVALID_ENUM"; break;
+      case GL_INVALID_VALUE:
+        errstr = "GL_INVALID_VALUE"; break;
+      case GL_INVALID_OPERATION:
+        errstr = "GL_INVALID_OPERATION"; break;
+      default:
+        errstr = "unknown"; break;
+    }
+    ERROR("Failed to allocate memory for texture! %dx%d size (%s)", width, height, errstr);
+  }
+  gl->TextureSubImage2D(t.id, 0,
+      // offset, size
+      0, 0, width, height,
+      format, GL_UNSIGNED_BYTE, image_data);
+  err = gl->GetError();
+  if (err) {
+    ERROR("Failed to copy image data!");
+  }
 
-  gl->BindTexture(GL_TEXTURE_2D, 0);
+  gl->TextureParameteri(t.id, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  gl->TextureParameteri(t.id, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 
   return t;
 }
-- 
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