Implement scissoring for Direct3D9/11/OpenGL too

misc/opengl/GL1Funcs.h

@@ -33,6 +33,7 @@ GL_FUNC(void, glVertexPointer)(GLint size, GLenum type, GLsizei stride, GLpointe
 GL_FUNC(void, glClear)(GLuint mask);
 GL_FUNC(void, glHint)(GLenum target, GLenum mode);
 GL_FUNC(void, glReadPixels)(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid* pixels);
+GL_FUNC(void, glScissor)(GLint x, GLint y, GLsizei width, GLsizei height);
 
 /* Texture functions */
 GL_FUNC(void, glBindTexture)(GLenum target, GLuint texture);

misc/opengl/GLCommon.h

@@ -63,6 +63,8 @@ typedef cc_uintptr GLpointer;
 #define GL_MATRIX_MODE           0x0BA0
 #define GL_VIEWPORT              0x0BA2
 #define GL_ALPHA_TEST            0x0BC0
+#define GL_SCISSOR_TEST          0x0C11
+
 #define GL_MAX_TEXTURE_SIZE      0x0D33
 #define GL_DEPTH_BITS            0x0D56
 

src/Graphics_D3D11.c

@@ -630,22 +630,35 @@ void Gfx_DisableTextureOffset(void) {
 //---------------------------------------------------------Rasteriser-----------------------------------------------------
 //########################################################################################################################
 // https://docs.microsoft.com/en-us/windows/win32/direct3d11/d3d10-graphics-programming-guide-rasterizer-stage
-static ID3D11RasterizerState* rs_states[2];
-static cc_bool rs_culling;
+static ID3D11RasterizerState* rs_states[4];
+static cc_bool rs_culling, rs_scissor;
 
 static void RS_CreateRasterState(void) {
 	// https://docs.microsoft.com/en-us/windows/win32/api/d3d11/ns-d3d11-d3d11_rasterizer_desc
 	D3D11_RASTERIZER_DESC desc = { 0 };
-	desc.CullMode              = D3D11_CULL_NONE;
-	desc.FillMode              = D3D11_FILL_SOLID;
-	desc.FrontCounterClockwise = true;
-	desc.DepthClipEnable       = true; // otherwise vertices/pixels beyond far plane are still wrongly rendered
-	ID3D11Device_CreateRasterizerState(device, &desc, &rs_states[0]);
-
-	desc.CullMode = D3D11_CULL_BACK;
-	ID3D11Device_CreateRasterizerState(device, &desc, &rs_states[1]);
+	for (int i = 0; i < Array_Elems(rs_states); i++)
+	{
+		desc.CullMode              = (i & 1) ? D3D11_CULL_BACK : D3D11_CULL_NONE;
+		desc.ScissorEnable         = (i & 2) != 0;
+		desc.FillMode              = D3D11_FILL_SOLID;
+		desc.FrontCounterClockwise = true;
+		desc.DepthClipEnable       = true; // otherwise vertices/pixels beyond far plane are still wrongly rendered
+		ID3D11Device_CreateRasterizerState(device, &desc, &rs_states[i]);
+	}
 }
 
+static void RS_UpdateRasterState(void) {
+	ID3D11DeviceContext_RSSetState(context, rs_states[rs_culling | (rs_scissor << 1)]);
+}
+
+static void RS_FreeRasterStates(void) {
+	for (int i = 0; i < Array_Elems(rs_states); i++)
+	{
+		ID3D11RasterizerState_Release(rs_states[i]);
+	}
+}
+
+
 void Gfx_SetViewport(int x, int y, int w, int h) {
 	D3D11_VIEWPORT viewport;
 	viewport.TopLeftX = x;
@@ -657,15 +670,16 @@ void Gfx_SetViewport(int x, int y, int w, int h) {
 	ID3D11DeviceContext_RSSetViewports(context, 1, &viewport);
 }
 
-static void RS_UpdateRasterState(void) {
-	ID3D11DeviceContext_RSSetState(context, rs_states[rs_culling]);
-}
+void Gfx_SetScissor(int x, int y, int w, int h) {
+	rs_scissor = x != 0 || y != 0 || w != Game.Width || h != Game.Height;
 
-static void RS_FreeRasterStates(void) {
-	for (int i = 0; i < Array_Elems(rs_states); i++) 
-	{
-		ID3D11RasterizerState_Release(rs_states[i]);
-	}
+	D3D11_RECT rect;
+	rect.left   = x;
+	rect.top    = y;
+	rect.right  = x + w;
+	rect.bottom = y + h;
+	ID3D11DeviceContext_RSSetScissorRects(context, 1, &rect);
+	RS_UpdateRasterState();
 }
 
 static void RS_Init(void) {

src/Graphics_D3D9.c

@@ -891,4 +891,16 @@ void Gfx_SetViewport(int x, int y, int w, int h) {
 	vp.MaxZ   = 1.0f;
 	IDirect3DDevice9_SetViewport(device, &vp);
 }
+
+void Gfx_SetScissor(int x, int y, int w, int h) {
+	cc_bool enabled = x != 0 || y != 0 || w != Game.Width || h != Game.Height;
+	RECT rect;
+	rect.left   = x;
+	rect.top    = y;
+	rect.right  = x + w;
+	rect.bottom = y + h;
+
+	IDirect3DDevice9_SetRenderState(device, D3DRS_SCISSORTESTENABLE, enabled);
+	IDirect3DDevice9_SetScissorRect(device, &rect);
+}
 #endif

src/Graphics_Dreamcast.c

@@ -624,15 +624,6 @@ extern float VP_COL_X_PLUS_HWIDTH,  VP_TEX_X_PLUS_HWIDTH;
 extern float VP_COL_Y_PLUS_HHEIGHT, VP_TEX_Y_PLUS_HHEIGHT;
 
 void Gfx_SetViewport(int x, int y, int w, int h) {
-	if (x == 0 && y == 0 && w == Game.Width && h == Game.Height) {
-		SCISSOR_TEST_ENABLED = GL_FALSE;
-	} else {
-		SCISSOR_TEST_ENABLED = GL_TRUE;
-	}
-	STATE_DIRTY = GL_TRUE;
-	
-	glScissor (x, y, w, h);
-
 	VIEWPORT.hwidth  = w *  0.5f;
 	VIEWPORT.hheight = h * -0.5f;
 	VIEWPORT.x_plus_hwidth  = x + w * 0.5f;
@@ -644,4 +635,10 @@ void Gfx_SetViewport(int x, int y, int w, int h) {
 	VP_COL_X_PLUS_HWIDTH  = VP_TEX_X_PLUS_HWIDTH  = x + w * 0.5f;
 	VP_COL_Y_PLUS_HHEIGHT = VP_TEX_Y_PLUS_HHEIGHT = y + h * 0.5f;
 }
+
+void Gfx_SetScissor(int x, int y, int w, int h) {
+	SCISSOR_TEST_ENABLED = x != 0 || y != 0 || w != Game.Width || h != Game.Height;
+	STATE_DIRTY = GL_TRUE;
+	glScissor(x, y, w, h);
+}
 #endif

src/Graphics_SoftGPU.c

@@ -932,22 +932,27 @@ void Gfx_OnWindowResize(void) {
 	fb_width   = Game.Width;
 	fb_height  = Game.Height;
 
-	vp_hwidth  = fb_width  / 2.0f;
-	vp_hheight = fb_height / 2.0f;
-
-	fb_maxX = fb_width  - 1;
-	fb_maxY = fb_height - 1;
-
 	Window_AllocFramebuffer(&fb_bmp, Game.Width, Game.Height);
 	colorBuffer = fb_bmp.scan0;
 	cb_stride   = fb_bmp.width;
 
 	depthBuffer = Mem_Alloc(fb_width * fb_height, 4, "depth buffer");
 	db_stride   = fb_width;
+
+	Gfx_SetViewport(0, 0, Game.Width, Game.Height);
+	Gfx_SetScissor (0, 0, Game.Width, Game.Height);
 }
 
-void Gfx_SetViewport(int x, int y, int w, int h) { }
-void Gfx_SetScissor (int x, int y, int w, int h) { }
+void Gfx_SetViewport(int x, int y, int w, int h) {
+	vp_hwidth  = w / 2.0f;
+	vp_hheight = h / 2.0f;
+}
+
+void Gfx_SetScissor (int x, int y, int w, int h) {
+	/* TODO minX/Y */
+	fb_maxX = x + w - 1;
+	fb_maxY = y + h - 1;
+}
 
 void Gfx_GetApiInfo(cc_string* info) {
 	int pointerSize = sizeof(void*) * 8;

src/_GLShared.h

@@ -336,3 +336,10 @@ void Gfx_OnWindowResize(void) {
 void Gfx_SetViewport(int x, int y, int w, int h) {
 	glViewport(x, y, w, h);
 }
+
+void Gfx_SetScissor(int x, int y, int w, int h) {
+	cc_bool enabled = x != 0 || y != 0 || w != Game.Width || h != Game.Height;
+	if (enabled) { glEnable(GL_SCISSOR_TEST); } else { glDisable(GL_SCISSOR_TEST); }
+
+	glScissor(x, Game.Height - h - y, w, h);
+}