GPUTexture: Add skeleton of the new GLTexture class

1 files changed, 79 insertions, 4 deletions

diff --git a/source/blender/gpu/intern/gpu_texture_private.hh b/source/blender/gpu/intern/gpu_texture_private.hh
index 6aa2a39046e..5eeb3d9e0f0 100644
--- a/source/blender/gpu/intern/gpu_texture_private.hh
+++ b/source/blender/gpu/intern/gpu_texture_private.hh
@@ -25,15 +25,88 @@
 
 #include "BLI_assert.h"
 
+#include "gpu_framebuffer_private.hh"
+
 namespace blender {
 namespace gpu {
 
+typedef enum eGPUTextureFlag {
+  GPU_TEXFORMAT_DEPTH = (1 << 0),
+  GPU_TEXFORMAT_STENCIL = (1 << 1),
+  GPU_TEXFORMAT_INTEGER = (1 << 2),
+  GPU_TEXFORMAT_FLOAT = (1 << 3),
+
+  GPU_TEXTURE_1D = (1 << 10),
+  GPU_TEXTURE_2D = (1 << 11),
+  GPU_TEXTURE_3D = (1 << 12),
+  GPU_TEXTURE_CUBE = (1 << 13),
+  GPU_TEXTURE_ARRAY = (1 << 14),
+  GPU_TEXTURE_BUFFER = (1 << 15),
+
+  GPU_TEXTURE_1D_ARRAY = (GPU_TEXTURE_1D | GPU_TEXTURE_ARRAY),
+  GPU_TEXTURE_2D_ARRAY = (GPU_TEXTURE_2D | GPU_TEXTURE_ARRAY),
+  GPU_TEXTURE_CUBE_ARRAY = (GPU_TEXTURE_CUBE | GPU_TEXTURE_ARRAY),
+
+  GPU_TEXTURE_TARGET = (GPU_TEXTURE_1D | GPU_TEXTURE_2D | GPU_TEXTURE_3D | GPU_TEXTURE_CUBE |
+                        GPU_TEXTURE_ARRAY),
+} eGPUTextureFlag;
+
+ENUM_OPERATORS(eGPUTextureFlag)
+
+#ifdef DEBUG
+#  define DEBUG_NAME_LEN 64
+#else
+#  define DEBUG_NAME_LEN 8
+#endif
+
+/* Maximum number of FBOs a texture can be attached to. */
+#define GPU_TEX_MAX_FBO_ATTACHED 12
+
 class Texture {
  public:
-  /** TODO(fclem): make it a non-static function. */
-  static GPUAttachmentType attachment_type(GPUTexture *tex, int slot)
+  /** Width & Height & Depth. */
+  int w = 0, h = 0, d = 0;
+  /** Number of color/alpha channels. */
+  int components = 0;
+  /** Internal data format and it's characteristics. */
+  eGPUTextureFormat format;
+  eGPUTextureFlag flag;
+  /** Internal Sampler state. */
+  eGPUSamplerState sampler_state;
+  /** Number of mipmaps this texture has. */
+  int mipmaps = 0;
+  /** Reference counter. */
+  int refcount = 0;
+  /** Width & Height (of source data), optional. */
+  int src_w = 0, src_h = 0;
+  /** Framebuffer references to update on deletion. */
+  GPUAttachmentType fb_attachment[GPU_TEX_MAX_FBO_ATTACHED];
+  FrameBuffer *fb[GPU_TEX_MAX_FBO_ATTACHED];
+
+ protected:
+  /** For debugging */
+  char name_[DEBUG_NAME_LEN];
+
+ public:
+  Texture(const char *name);
+  virtual ~Texture();
+
+  virtual void bind(int slot) = 0;
+  virtual void update(void *data) = 0;
+  virtual void update_sub(void *data, int offset[3], int size[3]) = 0;
+  virtual void generate_mipmap(void) = 0;
+  virtual void copy_to(Texture *tex) = 0;
+
+  virtual void swizzle_set(char swizzle_mask[4]) = 0;
+
+  /* TODO(fclem) Legacy. Should be removed at some point. */
+  virtual uint gl_bindcode_get(void) = 0;
+
+  void attach_to(FrameBuffer *fb);
+
+  GPUAttachmentType attachment_type(int slot) const
   {
-    switch (GPU_texture_format(tex)) {
+    switch (format) {
       case GPU_DEPTH_COMPONENT32F:
       case GPU_DEPTH_COMPONENT24:
       case GPU_DEPTH_COMPONENT16:
@@ -44,10 +117,12 @@ class Texture {
         BLI_assert(slot == 0);
         return GPU_FB_DEPTH_STENCIL_ATTACHMENT;
       default:
-        return static_cast<GPUAttachmentType>(GPU_FB_COLOR_ATTACHMENT0 + slot);
+        return GPU_FB_COLOR_ATTACHMENT0 + slot;
     }
   }
 };
 
+#undef DEBUG_NAME_LEN
+
 }  // namespace gpu
 }  // namespace blender