camera render to surface

prosperon/prosperon.cm

@@ -273,7 +273,7 @@ var alpha_blend_state = {
   dst_rgb: "one_minus_src_alpha",
   op_rgb: "add",
   src_alpha: "one",
-  dst_alpha: "zero",
+  dst_alpha: "one_minus_src_alpha",
   op_alpha: "add"
 }
 
@@ -443,6 +443,8 @@ var cur_cam
 var cmd_fns = {}
 cmd_fns.camera = function(cmd)
 {
+  if (cmd.camera.surface && !cmd.camera.surface[GPU])
+    cmd.camera.surface[GPU] = new sdl_gpu.texture(device, cmd.camera.surface)
   draw_queue.push(cmd)
 }
 
@@ -504,7 +506,7 @@ function render_geom(geom, img)
   if (!img[GPU]) {
     if (img.surface)
       img[GPU] = get_img_gpu(img.surface)
-    else
+    else 
       img[GPU] = get_img_gpu(img.cpu)
   }
   
@@ -527,7 +529,12 @@ function render_geom(geom, img)
 
 cmd_fns.draw_image = function(cmd)
 {
-  var img = graphics.texture(cmd.image)
+  var img
+  if (typeof cmd.image == 'string')
+    img = graphics.texture(cmd.image)
+  else
+    img = cmd.image
+    
   var geom = geometry.make_rect_quad({x:cmd.rect.x, y:cmd.rect.y, width: img.width, height: img.height})
   geom.indices = geometry.make_quad_indices(1)
   geom.num_indices = 6
@@ -641,33 +648,61 @@ prosperon.create_batch = function create_batch(draw_cmds, done) {
   
   for (var g of new_tex)
     render_queue.generate_mipmaps(g)
-  
-  var render_pass = render_queue.swapchain_pass(window)  
-  
-  render_pass.bind_pipeline(pipey)
-  
-  render_pass.bind_buffers(0, [
-    { buffer: pos_buffer,   offset: 0 },
-    { buffer: uv_buffer,    offset: 0 },
-    { buffer: color_buffer, offset: 0 }
-  ])
-  
-  render_pass.bind_index_buffer(
-    { buffer: index_buffer, offset: 0 },  // the binding itself is in bytes
-    16                                    // 16 = Uint32 indices
-  );
+    
+  var render_pass
+  var render_target
   
   for (var cmd of draw_queue) {
     if (cmd.camera) {
-      render_pass.viewport({
-        x: cmd.camera.viewport.x*win_size.width,
-        y: cmd.camera.viewport.y * win_size.height,
-        width: cmd.camera.viewport.width * win_size.width,
-        height: cmd.camera.viewport.height * win_size.height 
-      })
+      if (!cmd.camera.surface && render_target != "swap") {
+        if (render_pass)
+          render_pass.end()
+        render_target = "swap"
+        render_pass = render_queue.swapchain_pass(window)
+      } else if (cmd.camera.surface && render_target != cmd.camera.surface) {
+        if (render_pass)
+          render_pass.end()
+        render_target = cmd.camera.surface      
+        render_pass = render_queue.render_pass({
+          color_targets: [{
+            texture: cmd.camera.surface[GPU],
+            mip_level: 0,
+            layer: 0,
+            load: "clear",
+            store: "store",
+          }]
+        })
+      }
+      render_pass.bind_pipeline(pipey)
+      render_pass.bind_buffers(0, [
+        { buffer: pos_buffer,   offset: 0 },
+        { buffer: uv_buffer,    offset: 0 },
+        { buffer: color_buffer, offset: 0 }
+      ])
       
+      render_pass.bind_index_buffer(
+        { buffer: index_buffer, offset: 0 },  // the binding itself is in bytes
+        16                                    // 16 = Uint32 indices
+      );
+      var vpW, vpH
+      
+      if (render_target == "swap") {
+        vpW = win_size.width
+        vpH = win_size.height
+      } else {
+        vpW = render_target.width
+        vpH = render_target.height
+      }
+      
+      render_pass.viewport({
+        x: cmd.camera.viewport.x*vpW,
+        y: cmd.camera.viewport.y * vpH,
+        width: cmd.camera.viewport.width * vpW,
+        height: cmd.camera.viewport.height * vpH
+      })
+
       cur_cam = make_camera_pblob(cmd.camera)
-      render_queue.push_vertex_uniform_data(0, cur_cam)      
+      render_queue.push_vertex_uniform_data(0, cur_cam)
       continue
     }
     render_pass.bind_samplers(false, 0, [{texture:cmd.texture, sampler: std_sampler}])

source/qjs_sdl_gpu.c

@@ -313,7 +313,7 @@ ENUM_MAPPING_TABLE(SDL_GPUTextureFormat) = {
   {SDL_GPU_TEXTUREFORMAT_B5G6R5_UNORM, "b5g6r5"},
   {SDL_GPU_TEXTUREFORMAT_B5G5R5A1_UNORM, "b5g5r5a1"},
   {SDL_GPU_TEXTUREFORMAT_B4G4R4A4_UNORM, "b4g4r4a4"},
-  {SDL_GPU_TEXTUREFORMAT_B8G8R8A8_UNORM, "b8g8r8a8"},
+  {SDL_GPU_TEXTUREFORMAT_B8G8R8A8_UNORM, "bgra8"},
   {SDL_GPU_TEXTUREFORMAT_BC1_RGBA_UNORM, "bc1"},
   {SDL_GPU_TEXTUREFORMAT_BC2_RGBA_UNORM, "bc2"},
   {SDL_GPU_TEXTUREFORMAT_BC3_RGBA_UNORM, "bc3"},