From cb55a7716f136ccaa7b71a20ed55c8d9745637ca Mon Sep 17 00:00:00 2001
From: Gregory Wells <me@gregorywells.dev>
Date: Mon, 18 Aug 2025 00:08:18 -0400
Subject: [PATCH] copy needed data into renderpass

---
 .../metal/src/renderpass/metal_render_pass.h  |  2 -
 .../opengl_render_pass_descriptor.c           | 46 ++++++++++++++++++-
 .../opengl_render_pass_descriptor.h           | 30 +++++++++++-
 3 files changed, 74 insertions(+), 4 deletions(-)

diff --git a/projects/apis/metal/src/renderpass/metal_render_pass.h b/projects/apis/metal/src/renderpass/metal_render_pass.h
index ed874db..cc35001 100644
--- a/projects/apis/metal/src/renderpass/metal_render_pass.h
+++ b/projects/apis/metal/src/renderpass/metal_render_pass.h
@@ -22,8 +22,6 @@ typedef struct gnPlatformRenderPassDescriptor_t {
     uint32_t subpassCount;
     mtlSubpass* subpasses;
     mtlSubpassCopyInfo* copyInfos;
-
-
 } gnPlatformRenderPassDescriptor;
 
 gnReturnCode createMetalRenderPass(gnRenderPassDescriptor renderPass, gnDevice device, gnRenderPassDescriptorInfo info);
diff --git a/projects/apis/opengl/src/renderpass/opengl_render_pass_descriptor.c b/projects/apis/opengl/src/renderpass/opengl_render_pass_descriptor.c
index dc2a62a..7a34a09 100644
--- a/projects/apis/opengl/src/renderpass/opengl_render_pass_descriptor.c
+++ b/projects/apis/opengl/src/renderpass/opengl_render_pass_descriptor.c
@@ -1,6 +1,50 @@
 #include "opengl_render_pass_descriptor.h"
+#include "surface/opengl_surface.h"
+#include "stdlib.h"
 
 gnReturnCode openglCreateRenderPass(gnRenderPassDescriptor renderPass, gnDevice device, gnRenderPassDescriptorInfo info) {
+    if (device == GN_NULL_HANDLE) return GN_INVALID_HANDLE;
+    renderPass->renderPassDescriptor = malloc(sizeof(gnPlatformRenderPassDescriptor));
+    renderPass->renderPassDescriptor->subpassCount = info.subpassCount;
+    renderPass->renderPassDescriptor->subpasses = malloc(sizeof(glSubpass) * info.subpassCount);
+
+    for (uint32_t i = 0; i < info.subpassCount; i++) {
+        renderPass->renderPassDescriptor->subpasses[i] = (glSubpass){
+            .colorAttachmentCount = info.subpassInfos[i].colorAttachmentCount,
+            .colorAttachments = malloc(sizeof(glColorAttachment) * info.subpassInfos[i].colorAttachmentCount),
+            .depthAttachment.index = -1
+        };
+        gnBool resolve = !(info.subpassInfos[i].resolveAttachments == NULL);
+        for (uint32_t c = 0; c < info.subpassInfos[i].colorAttachmentCount; c++) {
+            uint32_t attachmentIndex = info.subpassInfos[i].colorAttachments[c].index;
+            int resolveAttachmentIndex = -1;
+            if (resolve)
+                resolveAttachmentIndex = info.subpassInfos[i].resolveAttachments[c].index;
+
+            renderPass->renderPassDescriptor->subpasses[i].colorAttachments[c] = (glColorAttachment){
+                .loadOperation  = info.attachmentInfos[attachmentIndex].loadOperation,
+                .storeOperation = info.attachmentInfos[attachmentIndex].storeOperation,
+                .attachmentIndex = attachmentIndex,
+                .resolveAttachmentIndex = resolveAttachmentIndex,
+                .format = glGryphnFormatToOpenGLFormat(info.attachmentInfos[attachmentIndex].format)
+            };
+        }
+
+        if (info.subpassInfos[i].depthAttachment != NULL) {
+            uint32_t depthAttachmentIndex = info.subpassInfos[i].depthAttachment->index;
+            renderPass->renderPassDescriptor->subpasses[i].depthAttachment = (gnDepthAttachment){
+                .index = depthAttachmentIndex,
+                .format = glGryphnFormatToOpenGLFormat(info.attachmentInfos[depthAttachmentIndex].format),
+                .loadOperation  = info.attachmentInfos[depthAttachmentIndex].loadOperation,
+                .storeOperation = info.attachmentInfos[depthAttachmentIndex].storeOperation,
+            };
+        }
+    }
     return GN_SUCCESS;
 }
-void openglDestroyRenderPass(gnRenderPassDescriptor renderPass) {}
+void openglDestroyRenderPass(gnRenderPassDescriptor renderPass) {
+    for (int i = 0; i < renderPass->renderPassDescriptor->subpassCount; i++)
+        free(renderPass->renderPassDescriptor->subpasses[i].colorAttachments);
+    free(renderPass->renderPassDescriptor->subpasses);
+    free(renderPass->renderPassDescriptor);
+}
diff --git a/projects/apis/opengl/src/renderpass/opengl_render_pass_descriptor.h b/projects/apis/opengl/src/renderpass/opengl_render_pass_descriptor.h
index 8c7386b..36d7111 100644
--- a/projects/apis/opengl/src/renderpass/opengl_render_pass_descriptor.h
+++ b/projects/apis/opengl/src/renderpass/opengl_render_pass_descriptor.h
@@ -1,6 +1,34 @@
 #pragma once
+#include "glad/glad.h"
 #include "core/src/renderpass/gryphn_render_pass_descriptor.h"
+#include "utils/gryphn_color.h"
 
-typedef struct gnPlatformRenderPassDescriptor_t gnPlatformRenderPassDescriptor;
+typedef struct glColorAttachment {
+    gnColor clearColor;
+    gnLoadOperation loadOperation;
+    gnStoreOperation storeOperation;
+
+    GLint format;
+    uint32_t attachmentIndex;
+    int resolveAttachmentIndex; // -1 = no attachment
+} glColorAttachment;
+
+typedef struct gnDepthAttachment {
+    int index;
+    gnLoadOperation loadOperation;
+    gnStoreOperation storeOperation;
+    GLint format;
+} gnDepthAttachment;
+
+typedef struct glSubpass {
+    uint32_t colorAttachmentCount;
+    glColorAttachment* colorAttachments;
+    gnDepthAttachment depthAttachment;
+} glSubpass;
+
+typedef struct gnPlatformRenderPassDescriptor_t {
+    uint32_t subpassCount;
+    glSubpass* subpasses;
+} gnPlatformRenderPassDescriptor;
 gnReturnCode openglCreateRenderPass(gnRenderPassDescriptor renderPass, gnDevice device, gnRenderPassDescriptorInfo info);
 void openglDestroyRenderPass(gnRenderPassDescriptor renderPass);