[dxvk] Support arbitrary source texture coordinates in blitter

src/dxvk/dxvk_context.cpp

@@ -1688,7 +1688,9 @@ namespace dxvk {
       passInfo.renderArea  = scissor;
       
       // Set up push constants
-      DxvkMetaBlitPushConstants pushConstants;
+      DxvkMetaBlitPushConstants pushConstants = { };
+      pushConstants.srcCoord0  = { 0.0f, 0.0f, 0.0f };
+      pushConstants.srcCoord1  = { 1.0f, 1.0f, 1.0f };
       pushConstants.layerCount = passExtent.depth;
       
       m_cmd->cmdBeginRenderPass(&passInfo, VK_SUBPASS_CONTENTS_INLINE);

src/dxvk/dxvk_meta_blit.h

@@ -9,12 +9,22 @@
 #include "dxvk_image.h"
 
 namespace dxvk {
+
+  /**
+   * \brief Texture coordinates
+   */
+  struct DxvkMetaBlitOffset {
+    float x, y, z;
+  };
   
   /**
    * \brief Push constant data
    */
   struct DxvkMetaBlitPushConstants {
-    uint32_t layerCount;
+    DxvkMetaBlitOffset srcCoord0;
+    uint32_t           pad1;
+    DxvkMetaBlitOffset srcCoord1;
+    uint32_t           layerCount;
   };
   
   /**

src/dxvk/shaders/dxvk_blit_frag_1d.frag

@@ -6,6 +6,14 @@ uniform sampler1DArray s_texture;
 layout(location = 0) in  vec2 i_pos;
 layout(location = 0) out vec4 o_color;
 
+layout(push_constant)
+uniform push_block {
+  vec3 p_src_coord0;
+  vec3 p_src_coord1;
+  uint p_layer_count;
+};
+
 void main() {
-  o_color = texture(s_texture, vec2(i_pos.x, gl_Layer));
+  float coord = mix(p_src_coord0.x, p_src_coord1.x, i_pos.x);
+  o_color = texture(s_texture, vec2(coord, gl_Layer));
 }

src/dxvk/shaders/dxvk_blit_frag_2d.frag

@@ -6,6 +6,14 @@ uniform sampler2DArray s_texture;
 layout(location = 0) in  vec2 i_pos;
 layout(location = 0) out vec4 o_color;
 
+layout(push_constant)
+uniform push_block {
+  vec3 p_src_coord0;
+  vec3 p_src_coord1;
+  uint p_layer_count;
+};
+
 void main() {
-  o_color = texture(s_texture, vec3(i_pos, gl_Layer));
+  vec2 coord = mix(p_src_coord0.xy, p_src_coord1.xy, i_pos);
+  o_color = texture(s_texture, vec3(coord, gl_Layer));
 }

src/dxvk/shaders/dxvk_blit_frag_3d.frag

@@ -8,10 +8,13 @@ layout(location = 0) out vec4 o_color;
 
 layout(push_constant)
 uniform push_block {
+  vec3 p_src_coord0;
+  vec3 p_src_coord1;
   uint p_layer_count;
 };
 
 void main() {
-  o_color = texture(s_texture, vec3(i_pos,
-    (float(gl_Layer) + 0.5f) / float(p_layer_count)));
+  vec3 coord = mix(p_src_coord0, p_src_coord1,
+    vec3(i_pos, (float(gl_Layer) + 0.5f) / float(p_layer_count)));
+  o_color = texture(s_texture, coord);
 }