From 2bea8ddf495fca4708a9a6c0e7c42c1be79d07d3 Mon Sep 17 00:00:00 2001
From: Katelyn Gadd <kg@luminance.org>
Date: Sat, 5 Oct 2024 16:09:55 -0700
Subject: [PATCH] Fix verifysamplers crash in SetRenderTargets when no shader
 is bound

---
 src/FNA3D_Driver_SDL.c | 52 +++++++++++++++++++++++++++---------------
 1 file changed, 33 insertions(+), 19 deletions(-)

diff --git a/src/FNA3D_Driver_SDL.c b/src/FNA3D_Driver_SDL.c
index d7588787..c6da7a71 100644
--- a/src/FNA3D_Driver_SDL.c
+++ b/src/FNA3D_Driver_SDL.c
@@ -1725,19 +1725,26 @@ static void SDLGPU_VerifyVertexSampler(
 	{
 		renderer->vertexTextureSamplerBindings[index].sampler = renderer->dummySampler;
 
-		samplerType = MOJOSHADER_sdlGetShaderParseData(vertShader)->samplers[index].type;
-
-		if (samplerType == MOJOSHADER_SAMPLER_2D)
-		{
-			renderer->vertexTextureSamplerBindings[index].texture = renderer->dummyTexture2D;
-		}
-		else if (samplerType == MOJOSHADER_SAMPLER_VOLUME)
+		if (vertShader)
 		{
-			renderer->vertexTextureSamplerBindings[index].texture = renderer->dummyTexture3D;
-		}
+			samplerType = MOJOSHADER_sdlGetShaderParseData(vertShader)->samplers[index].type;
+
+			if (samplerType == MOJOSHADER_SAMPLER_2D)
+			{
+				renderer->vertexTextureSamplerBindings[index].texture = renderer->dummyTexture2D;
+			}
+			else if (samplerType == MOJOSHADER_SAMPLER_VOLUME)
+			{
+				renderer->vertexTextureSamplerBindings[index].texture = renderer->dummyTexture3D;
+			}
+			else
+			{
+				renderer->vertexTextureSamplerBindings[index].texture = renderer->dummyTextureCube;
+			}
+		} 
 		else
 		{
-			renderer->vertexTextureSamplerBindings[index].texture = renderer->dummyTextureCube;
+			renderer->vertexTextureSamplerBindings[index].texture = renderer->dummyTexture2D;
 		}
 
 		return;
@@ -1780,18 +1787,25 @@ static void SDLGPU_VerifySampler(
 	{
 		renderer->fragmentTextureSamplerBindings[index].sampler = renderer->dummySampler;
 
-		samplerType = MOJOSHADER_sdlGetShaderParseData(fragShader)->samplers[index].type;
-		if (samplerType == MOJOSHADER_SAMPLER_2D)
-		{
-			renderer->fragmentTextureSamplerBindings[index].texture = renderer->dummyTexture2D;
-		}
-		else if (samplerType == MOJOSHADER_SAMPLER_VOLUME)
+		if (fragShader) 
 		{
-			renderer->fragmentTextureSamplerBindings[index].texture = renderer->dummyTexture3D;
+			samplerType = MOJOSHADER_sdlGetShaderParseData(fragShader)->samplers[index].type;
+			if (samplerType == MOJOSHADER_SAMPLER_2D)
+			{
+				renderer->fragmentTextureSamplerBindings[index].texture = renderer->dummyTexture2D;
+			}
+			else if (samplerType == MOJOSHADER_SAMPLER_VOLUME)
+			{
+				renderer->fragmentTextureSamplerBindings[index].texture = renderer->dummyTexture3D;
+			}
+			else
+			{
+				renderer->fragmentTextureSamplerBindings[index].texture = renderer->dummyTextureCube;
+			}
 		}
-		else
+		else 
 		{
-			renderer->fragmentTextureSamplerBindings[index].texture = renderer->dummyTextureCube;
+			renderer->fragmentTextureSamplerBindings[index].texture = renderer->dummyTexture2D;
 		}
 
 		return;