Add IBO support

2 files changed, 28 insertions, 6 deletions

diff --git a/src/rendering/src/gl.c b/src/rendering/src/gl.c
index 0468c8b..e57e949 100644
--- a/src/rendering/src/gl.c
+++ b/src/rendering/src/gl.c
@@ -232,10 +232,11 @@ RenderObject RenderObject_new(
   /* The shader should be generalied, */
   for (usize i = 0; i < num_buffers; i++) {
     const usize sz = buffers[i].size_elem * buffers[i].count;
+    const u32 b_gl_type = ShaderBuffer_get_gl_type(buffers[i].buffertype);
 
     gl->GenBuffers(1, &(buffers[i].buffername));
-    gl->BindBuffer(GL_ARRAY_BUFFER, buffers[i].buffername);
-    gl->BufferData(GL_ARRAY_BUFFER, (isize)sz, buffers[i].data, ShaderBuffer_get_gl_accesstype(buffers[i].buffertype));
+    gl->BindBuffer(b_gl_type, buffers[i].buffername);
+    gl->BufferData(b_gl_type, (isize)sz, buffers[i].data, ShaderBuffer_get_gl_accesstype(buffers[i].buffertype));
   }
 
   o.shader = *shader;
@@ -244,6 +245,13 @@ RenderObject RenderObject_new(
   o.buffer_len = num_buffers;
   o.mvp = gl->GetUniformLocation(o.shader.program, "MVP");
 
+  // It is very much a non-issue if we don't find the model view projection in
+  // the shader. In fact, it is removed from a shader program if it is not used.
+  // TODO: Add more uniforms, such as mouse coords and time. Could be cool idk.
+  //if (o.mvp == -1) {
+  //  WARN("Unable to find \"MVP\" input in shader program");
+  //}
+
   gl->BindVertexArray(0);
 
 
diff --git a/src/rendering/src/rendering.c b/src/rendering/src/rendering.c
index 571b9e0..0403928 100644
--- a/src/rendering/src/rendering.c
+++ b/src/rendering/src/rendering.c
@@ -495,9 +495,15 @@ void render_present(Window* w) {
       // TODO the buffers need to be abstracted a bit more
       gl->BindVertexArray(o->vao);
 
+      ShaderBuffer* ibo = NULL;
       for (usize i = 0; i < o->buffer_len; i++) {
+        const u32 b_gl_type = ShaderBuffer_get_gl_type(o->buffer[i].buffertype);
+        if (b_gl_type == GL_ELEMENT_ARRAY_BUFFER) {
+          ibo = &o->buffer[i];
+        }
+
         gl->EnableVertexAttribArray((u32)i);
-        gl->BindBuffer(GL_ARRAY_BUFFER, o->buffer[i].buffername);
+        gl->BindBuffer(b_gl_type, o->buffer[i].buffername);
         gl->VertexAttribPointer(
             // index of the attribute
             (u32)i,
@@ -515,15 +521,23 @@ void render_present(Window* w) {
       }
 
       // Draw the model !
-      // TODO: Use DrawElements and an index buffer!
       const i32 sz = (i32)(o->buffer->count * o->buffer->size_elem);
-      gl->DrawArrays(GL_TRIANGLES, 0, sz); // Starting from vertex 0; 3 vertices total -> 1 triangle
+      if (ibo) {
+        gl->DrawElements(
+            GL_TRIANGLES,
+            (i32)ibo->count,
+            ShaderBuffer_get_gl_datatype(ibo->buffertype),
+            (void*)0
+            );
+      } else {
+        // Starting from vertex 0; 3 vertices total -> 1 triangle
+        gl->DrawArrays(GL_TRIANGLES, 0, sz);
+      }
 
       for (u32 i = 0; i < o->buffer_len; i++) {
         gl->DisableVertexAttribArray(i);
       }
 
-      //gl->DisableVertexAttribArray(1);
       gl->BindVertexArray(0);
 
       //if (i == 8) {