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Direct3D9: Add a workaround for translucent blocks not rendering properly when Direct3D9 device doesn't support D3DRS_COLORWRITEENABLE

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Since I was concerned that automatically detecting and enabling fallback mode might get falsely activated on some GPU drivers that actually support D3DRS_COLORWRITEENABLE, you have to manually add 'fallback-rendering=true' to options.txt
This commit is contained in:
UnknownShadow200 2023-06-17 20:05:33 +10:00
parent e9ddb97f56
commit 678da53658
1 changed files with 29 additions and 0 deletions
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29
src/Graphics_D3D9.c
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@ -30,6 +30,7 @@ static D3DFORMAT viewFormat, depthFormat;
static int cachedWidth, cachedHeight;
static int depthBits;
static float totalMem;
static cc_bool fallbackRendering;
static void D3D9_RestoreRenderStates(void);
static void D3D9_FreeResource(GfxResourceID* resource) {
@ -68,10 +69,15 @@ static void LoadD3D9Library(void) {
static void CreateD3D9Instance(void) {
d3d = _Direct3DCreate9(D3D_SDK_VERSION);
/* Normal Direct3D9 supports POOL_MANAGED textures */
/* (Direct3D9Ex does not support them however) */
Gfx.ManagedTextures = true;
if (!d3d) Logger_Abort("Direct3DCreate9 returned NULL");
fallbackRendering = Options_GetBool("fallback-rendering", false);
if (!fallbackRendering) return;
Platform_LogConst("WARNING: Using fallback rendering mode, which will reduce performance");
}
static void FindCompatibleViewFormat(void) {
@ -510,6 +516,29 @@ void Gfx_DepthOnlyRendering(cc_bool depthOnly) {
cc_bool enabled = !depthOnly;
Gfx_SetColWriteMask(enabled, enabled, enabled, enabled);
if (depthOnly) IDirect3DDevice9_SetTexture(device, 0, NULL);
/* For when Direct3D9 device doesn't support D3DRS_COLORWRITEENABLE */
/* Technically, the correct way to check for whether it works or not */
/* is by checking whether the PrimitiveMiscCaps field in D3DCAPS9 */
/* has the D3DPMISCCAPS_COLORWRITEENABLE flag set */
/* But since I'm unsure if there might be some GPU drivers out there */
/* that do support D3DRS_COLORWRITEENABLE but forget to set the flag, */
/* I've decided to require the user to manually enable this fallback */
if (!fallbackRendering) return;
/* https://gamedev.net/forums/topic/375017-c-enabling-disabling-writing-to-buffers/3473819/ */
if (depthOnly) {
/* finalX = srcX*0 + dstX*1 */
/* So in other words, final pixel = existing pixel */
/* Pretty costly performance wise though */
IDirect3DDevice9_SetRenderState(device, D3DRS_SRCBLEND, D3DBLEND_ZERO);
IDirect3DDevice9_SetRenderState(device, D3DRS_DESTBLEND, D3DBLEND_ONE);
Gfx_SetAlphaBlending(true);
} else {
/* finalX = srcX*srcA + dstX*(1-srcA) */
IDirect3DDevice9_SetRenderState(device, D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
IDirect3DDevice9_SetRenderState(device, D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
}
}
static void D3D9_RestoreRenderStates(void) {