From 0dc2e035abd0d9368550e0450450722709924f93 Mon Sep 17 00:00:00 2001
From: Gregory Wells <me@gregorywells.dev>
Date: Thu, 10 Jul 2025 08:48:51 -0400
Subject: [PATCH] generic OpenGL device

---
 .../opengl/loader/opengl_instance_loader.c    |  5 +--
 .../src/device/opengl_physical_device.c       | 35 +++++++++++++++++++
 .../src/device/opengl_physical_device.h       |  8 +++++
 .../gryphn_physical_output_device.c           |  4 +--
 .../gryphn_physical_output_device.h           |  8 ++---
 5 files changed, 52 insertions(+), 8 deletions(-)
 create mode 100644 projects/apis/opengl/src/device/opengl_physical_device.c
 create mode 100644 projects/apis/opengl/src/device/opengl_physical_device.h

diff --git a/projects/apis/opengl/loader/opengl_instance_loader.c b/projects/apis/opengl/loader/opengl_instance_loader.c
index 33bcb00..05b664d 100644
--- a/projects/apis/opengl/loader/opengl_instance_loader.c
+++ b/projects/apis/opengl/loader/opengl_instance_loader.c
@@ -1,13 +1,14 @@
 #include "opengl_loader.h"
 #include "instance/opengl_instance.h"
 #include "surface/opengl_surface.h"
+#include "device/opengl_physical_device.h"
 
 gnInstanceFunctions loadOpenGLInstanceFunctions() {
     return (gnInstanceFunctions){
         ._gnCreateInstance = createOpenGLInstance,
         ._gnDestroyInstance = destroyOpenGLInstance,
-        // ._gnGetPhysicalDevices = getMetalDevices,
-        // ._gnQueueCanPresentToSurface = metalCanQueuePresentToSurface,
+        ._gnGetPhysicalDevices = getOpenGLDevice,
+        ._gnQueueCanPresentToSurface = openGLQueueCanPresent,
         // ._gnCreateOutputDevice = createMetalOutputDevice,
         // ._gnDestroyOutputDevice = destroyMetalOutputDevice,
         #ifdef GN_PLATFORM_LINUX
diff --git a/projects/apis/opengl/src/device/opengl_physical_device.c b/projects/apis/opengl/src/device/opengl_physical_device.c
new file mode 100644
index 0000000..a2059cb
--- /dev/null
+++ b/projects/apis/opengl/src/device/opengl_physical_device.c
@@ -0,0 +1,35 @@
+#include "opengl_physical_device.h"
+
+gnPhysicalDevice* getOpenGLDevice(gnInstanceHandle instance, uint32_t* deviceCount) {
+    *deviceCount = 1;
+
+    gnPhysicalDevice* devices = malloc(sizeof(gnPhysicalDevice));
+
+    gnPhysicalDevice device = {
+        .physicalDevice = malloc(sizeof(gnPlatformPhysicalDevice)),
+        .features = {
+            .maxColorSamples = GN_SAMPLE_BIT_1,
+            .maxDepthSamples = GN_SAMPLE_BIT_1,
+            .maxMemoryAllocations = 0x40000000,
+            .maxPushConstantSize = 256
+        },
+        .properties = {
+            .deviceType = GN_DEDICATED_DEVICE,
+            .name = gnCreateString("Generic OpenGL device")
+        },
+        .queueProperties = {
+            .queueCount = 1,
+            .queueProperties = (gnQueueProperties[1]){
+                (gnQueueProperties){
+                    .queueCount = 1,
+                    .queueType = GN_QUEUE_GRAPHICS
+                }
+            }
+        }
+    };
+    devices[0] = device;
+    return devices;
+}
+gnBool openGLQueueCanPresent(const gnPhysicalDevice device, uint32_t queueIndex, gnWindowSurfaceHandle windowSurface) {
+    return gnTrue;
+}
diff --git a/projects/apis/opengl/src/device/opengl_physical_device.h b/projects/apis/opengl/src/device/opengl_physical_device.h
new file mode 100644
index 0000000..111ceb4
--- /dev/null
+++ b/projects/apis/opengl/src/device/opengl_physical_device.h
@@ -0,0 +1,8 @@
+#pragma once
+#include <GL/gl.h>
+#include "output_device/gryphn_physical_output_device.h"
+
+typedef struct gnPlatformPhysicalDevice_t {} gnPlatformPhysicalDevice;
+
+gnPhysicalDevice* getOpenGLDevice(gnInstanceHandle instance, uint32_t* deviceCount);
+gnBool openGLQueueCanPresent(const gnPhysicalDevice device, uint32_t queueIndex, gnWindowSurfaceHandle windowSurface);
diff --git a/projects/core/src/output_device/gryphn_physical_output_device.c b/projects/core/src/output_device/gryphn_physical_output_device.c
index 4d2c886..1c56224 100644
--- a/projects/core/src/output_device/gryphn_physical_output_device.c
+++ b/projects/core/src/output_device/gryphn_physical_output_device.c
@@ -23,7 +23,7 @@ gnBool gnQueueCanPresentToSurface(const gnPhysicalDevice device, uint32_t queueI
 
 gnBool gnHasGraphicsQueue(const gnPhysicalDevice device) {
     for (int i = 0; i < device.queueProperties.queueCount; i++) {
-        if (device.queueProperties.queueProperties[i].queueType & GN_QUEUE_GRAPHICS) {
+        if ((device.queueProperties.queueProperties[i].queueType & GN_QUEUE_GRAPHICS) == GN_QUEUE_GRAPHICS) {
             return gnTrue;
         }
     }
@@ -40,7 +40,7 @@ gnBool gnHasPresentQueue(const gnPhysicalDevice device, gnWindowSurfaceHandle wi
 
 int gnGetGraphicsQueueIndex(const gnPhysicalDevice device) {
     for (int i = 0; i < device.queueProperties.queueCount; i++) {
-        if (device.queueProperties.queueProperties[i].queueType & GN_QUEUE_GRAPHICS) {
+        if ((device.queueProperties.queueProperties[i].queueType & GN_QUEUE_GRAPHICS) == GN_QUEUE_GRAPHICS) {
             return i;
             break;
         }
diff --git a/projects/core/src/output_device/gryphn_physical_output_device.h b/projects/core/src/output_device/gryphn_physical_output_device.h
index 79c8f43..6fb3a62 100644
--- a/projects/core/src/output_device/gryphn_physical_output_device.h
+++ b/projects/core/src/output_device/gryphn_physical_output_device.h
@@ -29,10 +29,10 @@ typedef struct gnPhysicalDeviceFeatures {
 } gnPhysicalDeviceFeatures;
 
 typedef enum gnQueueTypeFlags {
-    GN_QUEUE_GRAPHICS = 1,
-    GN_QUEUE_COMPUTE = 2,
-    GN_QUEUE_TRANSFER = 4,
-    GN_QUEUE_SPARSE_BINDING = 8
+    GN_QUEUE_GRAPHICS       = 1 << 0,
+    GN_QUEUE_COMPUTE        = 1 << 1,
+    GN_QUEUE_TRANSFER       = 1 << 2,
+    GN_QUEUE_SPARSE_BINDING = 1 << 3
 } gnQueueTypeFlags;
 
 typedef struct gnQueueProperties {