From c7cbe4ac21a83513dbcdc8f659cc67b5657ce112 Mon Sep 17 00:00:00 2001
From: Martin Felis <martin@fysx.org>
Date: Wed, 20 Mar 2019 08:15:54 +0000
Subject: [PATCH] Rendercommand API

---
 src/modules/RenderCommands.cc | 47 +++++++++++++++++++++++++++++++++++
 src/modules/RenderCommands.h  | 31 ++++++++++++++++++++++-
 2 files changed, 77 insertions(+), 1 deletion(-)

diff --git a/src/modules/RenderCommands.cc b/src/modules/RenderCommands.cc
index 18fdf41..5f9b7c5 100644
--- a/src/modules/RenderCommands.cc
+++ b/src/modules/RenderCommands.cc
@@ -7,7 +7,41 @@
 
 using namespace std;
 
+const int cNumMaxRenderCommands = 1024;
+
+RenderCommand sRenderCommands[PassCount][cNumMaxRenderCommands];
+int sRenderCommandCount[PassCount];
+
+void RenderCommandReset(RenderCommand *command) {
+	assert (command != nullptr);
+
+	command->mColor[0] = 0.f;
+	command->mColor[1] = 0.f;
+	command->mColor[2] = 0.f;
+	command->mColor[3] = 0.f;
+
+	for (int i = 0; i < 16; i++) {
+		command->mTransform[i] = 0.f;
+	}
+	for (int i = 0; i < 4; i++) {
+		command->mTransform[i * 4 + i] = 1.f;
+	}
+
+	command->mVAId = -1;
+	command->mVBId = -1;
+
+	command->mAlbedoTexture = -1;
+	command->mPrimitive = PrimitiveTriangles;
+};
+
 void RenderCommandsClear() {
+	for (int i = 0; i < PassCount; i++) {
+		for (int j = 0; j < sRenderCommandCount[i]; j++) {
+			RenderCommandReset(&sRenderCommands[i][j]);
+		}
+		sRenderCommandCount[i] = 0;
+	}
+
 	if (gRenderer == NULL) {
 		gLog ("Warning: Cannot clear render commands: no renderer found!");
 		return;
@@ -15,6 +49,19 @@ void RenderCommandsClear() {
 	gRenderer->mRenderCommands.clear();
 }
 
+RenderCommand *GetRenderCommand(RenderPass pass) {
+	int& pass_count = sRenderCommandCount[pass];
+	if (pass_count == cNumMaxRenderCommands) {
+		gLog ("Error: Reached max number of render commands: %d for pass %d",
+				cNumMaxRenderCommands, pass);
+		return nullptr;
+	}
+
+	pass_count++;
+
+	return &sRenderCommands[pass][pass_count];
+}
+
 void RenderSubmit (
 		RenderObject object,
 		float* transform,
diff --git a/src/modules/RenderCommands.h b/src/modules/RenderCommands.h
index 92590a2..394c52f 100644
--- a/src/modules/RenderCommands.h
+++ b/src/modules/RenderCommands.h
@@ -8,12 +8,41 @@ typedef enum {
 	DebugCube = 1,
 	DebugFrame = 2,
 	DebugSphere = 3,
-	DebugBone = 4
+	DebugBone = 4,
+	StaticMesh = 5,
+	Line = 6,
+	SkinnedMesh = 7
 } RenderObject;
 
+typedef enum {
+	PassDepth     = 1,
+	PassShadowMap = 2,
+	PassSSAO      = 3,
+	PassLighting  = 4,
+	PassCount
+} RenderPass;
+
+typedef enum {
+	PrimitivePoints
+	PrimitiveLines,
+	PrimitiveTriangles,
+} RenderPrimitive;
+
+typedef struct {
+	float mColor[4];
+	float mTransform[16];
+	GLuint mVAId;
+	GLuint mVBId;
+	GLuint mAlbedoTexture;
+	RenderPrimitive mPrimitive;
+} RenderCommand;
+
 void RenderCommandsClear ();
 
+RenderCommand *GetRenderCommand(RenderPass pass);
+
 void RenderSubmit (
+		RenderPass pass,
 		RenderObject object,
 		float* transform,
 		float color[4]