gfx_read_image_data()

build.c

@@ -44,5 +44,7 @@ typedef struct Context_Extra {
 // #include "oogabooga/examples/growing_array_example.c"
 // #include "oogabooga/examples/input_example.c"
 
+// #include "oogabooga/examples/sanity_tests.c"
+
 // This is where you swap in your own project!
 // #include "entry_yourepicgamename.c"

changelog.txt

@@ -6,6 +6,8 @@
 		- Reworked window initialization
 			Window now starts of invisible and is made visible on first os_update().
 			This also gets rid of the weird window resize and reposition at startup.
+	- Renderer
+		- Added gfx_read_image_data() to read pixels from a Gfx_Image*
 
 
 ## v0.01.004 - Gamepad input, text wrapping, bug fixes

oogabooga/examples/minimal_game_loop.c

@@ -1,6 +1,11 @@
 
 int entry(int argc, char **argv) {
 	
+	// This is how we (optionally) configure the window.
+	// You can set this at any point in the runtime and it will
+	// be applied in os_update().
+	// If you don't care, you can ignore all of this as it all
+	// has reasonable default values.
 	window.title = STR("Minimal Game Example");
 	window.scaled_width = 1280; // We need to set the scaled size if we want to handle system scaling (DPI)
 	window.scaled_height = 720; 
@@ -8,6 +13,7 @@ int entry(int argc, char **argv) {
 	window.y = 90;
 	window.clear_color = hex_to_rgba(0x6495EDff);
 	window.allow_resize = true;
+	window.fullscreen = false;
 	
 	float64 last_time = os_get_elapsed_seconds();
 	while (!window.should_close) {

oogabooga/examples/sanity_tests.c

@@ -0,0 +1,69 @@
+
+int entry(int argc, char **argv) {
+	
+	
+	u32 w = 128;
+	u32 h = 128;
+	u32 tile_w = w/4;
+	u32 tile_h = w/4;
+	
+	u8 *pixels = (u8*)alloc(get_heap_allocator(), w * h * 4);
+
+	for (u32 y = 0; y < h; y += 1) {
+	    for (u32 x = 0; x < w; x += 1) {
+	        u32 tile_x = x / tile_w;
+	        u32 tile_y = y / tile_h;
+	
+	        bool is_black_tile = (tile_x % 2 == tile_y % 2);
+	
+	        for (u32 c = 0; c < 4; c += 1) {
+	            if (is_black_tile) {
+	                pixels[(y * w + x) * 4 + c] = 127;
+	            } else {
+	                pixels[(y * w + x) * 4 + c] = 255;
+	            }
+	        }
+	    }
+	}
+	
+	Gfx_Image *img = make_image(w, h, 4, pixels, get_heap_allocator());
+	
+	u8 *read_pixels = (u8*)alloc(get_heap_allocator(), w*h*4);
+	
+	gfx_read_image_data(img, 0, 0, w, h, read_pixels);
+	
+	gfx_set_image_data(img, 0, 0, w, h, read_pixels);
+	
+	assert(memcmp(read_pixels, pixels, w*h*4) == 0);
+	
+	float64 last_time = os_get_elapsed_seconds();
+	while (!window.should_close) {
+		reset_temporary_storage();
+		
+		float64 now = os_get_elapsed_seconds();
+		if ((int)now != (int)last_time) log("%.2f FPS\n%.2fms", 1.0/(now-last_time), (now-last_time)*1000);
+		last_time = now;
+		
+		Matrix4 rect_xform = m4_scalar(1.0);
+		rect_xform         = m4_rotate_z(rect_xform, (f32)now);
+		rect_xform         = m4_translate(rect_xform, v3(-.25f, -.25f, 0));
+		draw_image_xform(img, rect_xform, v2(.5f, .5f), COLOR_GREEN);
+		
+		draw_rect(v2(sin(now), -.8), v2(.5, .25), COLOR_RED);
+		
+		float aspect = (f32)window.width/(f32)window.height;
+		float mx = (input_frame.mouse_x/(f32)window.width  * 2.0 - 1.0)*aspect;
+		float my = input_frame.mouse_y/(f32)window.height * 2.0 - 1.0;
+		
+		draw_line(v2(-.75, -.75), v2(mx, my), 0.005, COLOR_WHITE);
+		
+		if (is_key_just_pressed('F')) {
+			window.fullscreen = !window.fullscreen;
+		}
+		
+		os_update(); 
+		gfx_update();
+	}
+
+	return 0;
+}

oogabooga/gfx_impl_d3d11.c

@@ -882,6 +882,7 @@ void gfx_init_image(Gfx_Image *image, void *initial_data) {
 	desc.Height = image->height;
 	desc.MipLevels = 1;
 	desc.ArraySize = 1;
+	// #Hdr
 	switch (image->channels) {
 		case 1: desc.Format = DXGI_FORMAT_R8_UNORM; break;
 		case 2: desc.Format = DXGI_FORMAT_R8G8_UNORM; break;
@@ -897,7 +898,7 @@ void gfx_init_image(Gfx_Image *image, void *initial_data) {
 	
 	D3D11_SUBRESOURCE_DATA data_desc = ZERO(D3D11_SUBRESOURCE_DATA);
 	data_desc.pSysMem = data;
-	data_desc.SysMemPitch  = image->width * image->channels;
+	data_desc.SysMemPitch  = image->width * image->channels; // #Hdr
 	
 	ID3D11Texture2D* texture = 0;
 	HRESULT hr = ID3D11Device_CreateTexture2D(d3d11_device, &desc, &data_desc, &texture);
@@ -927,16 +928,72 @@ void gfx_set_image_data(Gfx_Image *image, u32 x, u32 y, u32 w, u32 h, void *data
     HRESULT hr = ID3D11Resource_QueryInterface(resource, &IID_ID3D11Texture2D, (void**)&texture);
     assert(SUCCEEDED(hr), "Expected gfx resource to be a texture but it wasn't");
 
-    D3D11_BOX destBox;
-    destBox.left = x;
-    destBox.right = x + w;
-    destBox.top = y;
-    destBox.bottom = y + h;
-    destBox.front = 0;
-    destBox.back = 1;
+    D3D11_BOX region;
+    region.left = x;
+    region.right = x + w;
+    region.top = y;
+    region.bottom = y + h;
+    region.front = 0;
+    region.back = 1;
 
+	// #Hdr
 	// #Incomplete bit-width 8 assumed
-    ID3D11DeviceContext_UpdateSubresource(d3d11_context, (ID3D11Resource*)texture, 0, &destBox, data, w * image->channels, 0);
+    ID3D11DeviceContext_UpdateSubresource(d3d11_context, (ID3D11Resource*)texture, 0, &region, data, w * image->channels, 0);
+    
+    ID3D11Resource_Release(resource);
+}
+void gfx_read_image_data(Gfx_Image *image, u32 x, u32 y, u32 w, u32 h, void *output) {
+	
+    D3D11_BOX region;
+    region.left = x;
+    region.right = x + w;
+    region.top = y;
+    region.bottom = y + h;
+    region.front = 0;
+    region.back = 1;
+    
+	ID3D11Resource *resource = 0;
+	ID3D11View_GetResource(image->gfx_handle, &resource);
+	
+	ID3D11Texture2D *texture = 0;
+	HRESULT hr = ID3D11Resource_QueryInterface(resource, &IID_ID3D11Texture2D, (void**)&texture);
+	d3d11_check_hr(hr);
+	
+	D3D11_TEXTURE2D_DESC desc;
+    texture->lpVtbl->GetDesc(texture, &desc);
+    
+    D3D11_TEXTURE2D_DESC staging_desc = desc;
+    staging_desc.Usage = D3D11_USAGE_STAGING;
+    staging_desc.BindFlags = 0;
+    staging_desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
+    staging_desc.MiscFlags = 0;
+    
+    ID3D11Texture2D *staging_texture = 0;
+    hr = ID3D11Device_CreateTexture2D(d3d11_device, &staging_desc, 0, &staging_texture);
+	d3d11_check_hr(hr);
+	
+	ID3D11DeviceContext_CopySubresourceRegion(
+		d3d11_context, 
+		(ID3D11Resource *)staging_texture, 
+		0, 0, 0, 0, 
+		(ID3D11Resource *)texture, 0, 
+		&region
+	);
+	
+	D3D11_MAPPED_SUBRESOURCE mapped_texture;
+    hr = ID3D11DeviceContext_Map(d3d11_context, (ID3D11Resource *)staging_texture, 0, D3D11_MAP_READ, 0, &mapped_texture);
+	d3d11_check_hr(hr);
+	
+	// #Hdr
+	assert(mapped_texture.RowPitch == image->width * image->channels, "Unexpected row pitch in d3d11 texture");
+	
+	// #Hdr
+	memcpy(output, mapped_texture.pData, image->width*image->height*image->channels);
+	
+	ID3D11DeviceContext_Unmap(d3d11_context, (ID3D11Resource *)staging_texture, 0);
+	
+	ID3D11Resource_Release(resource);
+	ID3D11Texture2D_Release(staging_texture);
 }
 void gfx_deinit_image(Gfx_Image *image) {
 	ID3D11ShaderResourceView *view = image->gfx_handle;
@@ -952,6 +1009,8 @@ void gfx_deinit_image(Gfx_Image *image) {
 	} else {
 		panic("Unhandled D3D11 resource deletion");
 	}
+	
+	ID3D11Resource_Release(resource);
 }
 
 bool 

oogabooga/gfx_interface.c

@@ -49,6 +49,8 @@ ogb_instance void
 gfx_init_image(Gfx_Image *image, void *data);
 ogb_instance void 
 gfx_set_image_data(Gfx_Image *image, u32 x, u32 y, u32 w, u32 h, void *data);
+ogb_instance void
+gfx_read_image_data(Gfx_Image *image, u32 x, u32 y, u32 w, u32 h, void *output);
 ogb_instance void 
 gfx_deinit_image(Gfx_Image *image);