GPUFramebuffer: Add support to attach individual texture layer.

4 files changed, 28 insertions, 6 deletions

diff --git a/source/blender/draw/intern/DRW_render.h b/source/blender/draw/intern/DRW_render.h
index 25e6bec93b6..3c368944320 100644
--- a/source/blender/draw/intern/DRW_render.h
+++ b/source/blender/draw/intern/DRW_render.h
@@ -198,6 +198,7 @@ void DRW_framebuffer_bind(struct GPUFrameBuffer *fb);
 void DRW_framebuffer_clear(bool color, bool depth, bool stencil, float clear_col[4], float clear_depth);
 void DRW_framebuffer_read_data(int x, int y, int w, int h, int channels, int slot, float *data);
 void DRW_framebuffer_texture_attach(struct GPUFrameBuffer *fb, struct GPUTexture *tex, int slot, int mip);
+void DRW_framebuffer_texture_layer_attach(struct GPUFrameBuffer *fb, struct GPUTexture *tex, int slot, int layer, int mip);
 void DRW_framebuffer_cubeface_attach(struct GPUFrameBuffer *fb, struct GPUTexture *tex, int slot, int face, int mip);
 void DRW_framebuffer_texture_detach(struct GPUTexture *tex);
 void DRW_framebuffer_blit(struct GPUFrameBuffer *fb_read, struct GPUFrameBuffer *fb_write, bool depth);
diff --git a/source/blender/draw/intern/draw_manager.c b/source/blender/draw/intern/draw_manager.c
index 62a95bcc22b..9483a55ec40 100644
--- a/source/blender/draw/intern/draw_manager.c
+++ b/source/blender/draw/intern/draw_manager.c
@@ -2089,10 +2089,16 @@ void DRW_framebuffer_texture_attach(struct GPUFrameBuffer *fb, GPUTexture *tex,
 	GPU_framebuffer_texture_attach(fb, tex, slot, mip);
 }
 
+void DRW_framebuffer_texture_layer_attach(struct GPUFrameBuffer *fb, struct GPUTexture *tex, int slot, int layer, int mip)
+{
+	GPU_framebuffer_texture_layer_attach(fb, tex, slot, layer, mip);
+}
+
 void DRW_framebuffer_cubeface_attach(struct GPUFrameBuffer *fb, GPUTexture *tex, int slot, int face, int mip)
 {
 	GPU_framebuffer_texture_cubeface_attach(fb, tex, slot, face, mip);
 }
+
 void DRW_framebuffer_texture_detach(GPUTexture *tex)
 {
 	GPU_framebuffer_texture_detach(tex);
diff --git a/source/blender/gpu/GPU_framebuffer.h b/source/blender/gpu/GPU_framebuffer.h
index 3ba3c6dbd15..6778930f61c 100644
--- a/source/blender/gpu/GPU_framebuffer.h
+++ b/source/blender/gpu/GPU_framebuffer.h
@@ -51,6 +51,8 @@ void GPU_texture_bind_as_framebuffer(struct GPUTexture *tex);
 
 GPUFrameBuffer *GPU_framebuffer_create(void);
 bool GPU_framebuffer_texture_attach(GPUFrameBuffer *fb, struct GPUTexture *tex, int slot, int mip);
+bool GPU_framebuffer_texture_layer_attach(
+        GPUFrameBuffer *fb, struct GPUTexture *tex, int slot, int layer, int mip);
 bool GPU_framebuffer_texture_cubeface_attach(
         GPUFrameBuffer *fb, struct GPUTexture *tex, int slot, int face, int mip);
 void GPU_framebuffer_texture_detach(struct GPUTexture *tex);
diff --git a/source/blender/gpu/intern/gpu_framebuffer.c b/source/blender/gpu/intern/gpu_framebuffer.c
index ae459eb7d2e..96c740410c5 100644
--- a/source/blender/gpu/intern/gpu_framebuffer.c
+++ b/source/blender/gpu/intern/gpu_framebuffer.c
@@ -163,7 +163,7 @@ bool GPU_framebuffer_texture_attach(GPUFrameBuffer *fb, GPUTexture *tex, int slo
 	return true;
 }
 
-bool GPU_framebuffer_texture_cubeface_attach(GPUFrameBuffer *fb, GPUTexture *tex, int slot, int face, int mip)
+static bool gpu_framebuffer_texture_layer_attach_ex(GPUFrameBuffer *fb, GPUTexture *tex, int slot, int layer, int mip, bool cubemap)
 {
 	GLenum attachment;
 	GLenum facetarget;
@@ -183,8 +183,6 @@ bool GPU_framebuffer_texture_cubeface_attach(GPUFrameBuffer *fb, GPUTexture *tex
 		}
 	}
 
-	BLI_assert(GPU_texture_target(tex) == GL_TEXTURE_CUBE_MAP);
-
 	glBindFramebuffer(GL_FRAMEBUFFER, fb->object);
 	GG.currentfb = fb->object;
 
@@ -195,9 +193,13 @@ bool GPU_framebuffer_texture_cubeface_attach(GPUFrameBuffer *fb, GPUTexture *tex
 	else
 		attachment = GL_COLOR_ATTACHMENT0 + slot;
 
-	facetarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X + face;
-
-	glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, facetarget, GPU_texture_opengl_bindcode(tex), mip);
+	if (cubemap) {
+		facetarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X + layer;
+		glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, facetarget, GPU_texture_opengl_bindcode(tex), mip);
+	}
+	else {
+		glFramebufferTextureLayer(GL_FRAMEBUFFER, attachment, GPU_texture_opengl_bindcode(tex), mip, layer);
+	}
 
 	if (GPU_texture_depth(tex))
 		fb->depthtex = tex;
@@ -209,6 +211,17 @@ bool GPU_framebuffer_texture_cubeface_attach(GPUFrameBuffer *fb, GPUTexture *tex
 	return true;
 }
 
+bool GPU_framebuffer_texture_layer_attach(GPUFrameBuffer *fb, GPUTexture *tex, int slot, int layer, int mip)
+{
+	return gpu_framebuffer_texture_layer_attach_ex(fb, tex, slot, layer, mip, false);
+}
+
+bool GPU_framebuffer_texture_cubeface_attach(GPUFrameBuffer *fb, GPUTexture *tex, int slot, int face, int mip)
+{
+	BLI_assert(GPU_texture_target(tex) == GL_TEXTURE_CUBE_MAP);
+	return gpu_framebuffer_texture_layer_attach_ex(fb, tex, slot, face, mip, true);
+}
+
 void GPU_framebuffer_texture_detach(GPUTexture *tex)
 {
 	GLenum attachment;