Be less eager to optimize constant conditions in loops

[libs/gl.git] / source / texturecube.cpp

diff --git a/source/texturecube.cpp b/source/texturecube.cpp
index e767423fe539f9ee92fd10dd5af8f1beaa6eebb4..03e65167d73fee7a1d89ba9ea3cea7ef2c68d81d 100644 (file)
--- a/source/texturecube.cpp
+++ b/source/texturecube.cpp
@@ -13,6 +13,16 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
+TextureCubeFace TextureCube::face_order[6] =
+{
+       POSITIVE_X,
+       NEGATIVE_X,
+       POSITIVE_Y,
+       NEGATIVE_Y,
+       POSITIVE_Z,
+       NEGATIVE_Z
+};
+
 Vector3 TextureCube::directions[6] =
 {
        Vector3(1, 0, 0),
@@ -23,41 +33,52 @@ Vector3 TextureCube::directions[6] =
        Vector3(0, 0, -1)
 };
 
+unsigned TextureCube::orientations[12] =
+{
+       5, 3,
+       4, 3,
+       0, 4,
+       0, 5,
+       0, 3,
+       1, 3
+};
+
 TextureCube::TextureCube():
        Texture(GL_TEXTURE_CUBE_MAP),
-       ifmt(RGB),
        size(0),
        allocated(0)
 {
        static Require _req(ARB_texture_cube_map);
 }
 
-void TextureCube::storage(PixelFormat fmt, unsigned sz)
+void TextureCube::storage(PixelFormat fmt, unsigned sz, unsigned lv)
 {
        if(size>0)
                throw invalid_operation("TextureCube::storage");
        if(sz==0)
                throw invalid_argument("TextureCube::storage");
 
-       if(MSP_sized_internal_formats)
-               fmt = get_sized_pixelformat(fmt);
-       require_pixelformat(fmt);
-
-       ifmt = fmt;
+       set_internal_format(fmt);
        size = sz;
+       levels = get_n_levels();
+       if(lv>0)
+               levels = min(levels, lv);
 }
 
 void TextureCube::allocate(unsigned level)
 {
+       if(size==0)
+               throw invalid_operation("TextureCube::allocate");
+       if(level>=levels)
+               throw invalid_argument("TextureCube::allocate");
        if(allocated&(1<<level))
                return;
 
        if(ARB_texture_storage)
        {
                BindRestore _bind(this);
-               unsigned n_levels = (is_mipmapped(min_filter) ? get_n_levels() : 1);
-               glTexStorage2D(target, n_levels, ifmt, size, size);
-               allocated |= (1<<n_levels)-1;
+               glTexStorage2D(target, levels, ifmt, size, size);
+               allocated |= (1<<levels)-1;
        }
        else
        {
@@ -81,7 +102,7 @@ void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, D
                return sub_image(face, level, 0, 0, s, s, fmt, type, data);
 
        BindRestore _bind(this);
-       glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
+       glTexImage2D(face, level, ifmt, s, s, 0, get_upload_format(fmt), type, data);
 
        // XXX Allocation should be tracked per-face, but we'll run out of bits
        allocated |= 1<<level;
@@ -101,7 +122,7 @@ void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y,
        BindRestore _bind(this);
        allocate(level);
 
-       glTexSubImage2D(face, level, x, y, wd, ht, fmt, type, data);
+       glTexSubImage2D(face, level, x, y, wd, ht, get_upload_format(fmt), type, data);
 
        if(gen_mipmap && level==0)
                auto_generate_mipmap();
@@ -139,7 +160,10 @@ void TextureCube::image(const Graphics::Image &img, bool srgb)
 
        PixelFormat fmt = pixelformat_from_graphics(img.get_format());
        if(size==0)
-               storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w);
+       {
+               unsigned l = (is_mipmapped(min_filter) ? mipmap_levels ? mipmap_levels : 0 : 1);
+               storage(storage_pixelformat_from_graphics(img.get_format(), srgb), w, l);
+       }
        else if(w!=size || h!=size)
                throw incompatible_data("TextureCube::image");
 
@@ -166,58 +190,38 @@ unsigned TextureCube::get_level_size(unsigned level) const
 
 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 {
-       switch(i)
-       {
-       case 0: return POSITIVE_X;
-       case 1: return NEGATIVE_X;
-       case 2: return POSITIVE_Y;
-       case 3: return NEGATIVE_Y;
-       case 4: return POSITIVE_Z;
-       case 5: return NEGATIVE_Z;
-       default: throw out_of_range("TextureCube::enumerate_faces");
-       }
+       if(i>=6)
+               throw out_of_range("TextureCube::enumerate_faces");
+       return face_order[i];
 }
 
-const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
+unsigned TextureCube::get_face_index(TextureCubeFace face)
 {
        switch(face)
        {
-       case POSITIVE_X: return directions[0];
-       case NEGATIVE_X: return directions[1];
-       case POSITIVE_Y: return directions[2];
-       case NEGATIVE_Y: return directions[3];
-       case POSITIVE_Z: return directions[4];
-       case NEGATIVE_Z: return directions[5];
-       default: throw invalid_argument("TextureCube::get_face_direction");
+       case POSITIVE_X: return 0;
+       case NEGATIVE_X: return 1;
+       case POSITIVE_Y: return 2;
+       case NEGATIVE_Y: return 3;
+       case POSITIVE_Z: return 4;
+       case NEGATIVE_Z: return 5;
+       default: throw invalid_argument("TextureCube::get_face_index");
        }
 }
 
+const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
+{
+       return directions[get_face_index(face)];
+}
+
 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 {
-       switch(face)
-       {
-       case POSITIVE_X: return directions[5];
-       case NEGATIVE_X: return directions[4];
-       case POSITIVE_Y: return directions[0];
-       case NEGATIVE_Y: return directions[0];
-       case POSITIVE_Z: return directions[0];
-       case NEGATIVE_Z: return directions[1];
-       default: throw invalid_argument("TextureCube::get_s_direction");
-       }
+       return directions[orientations[get_face_index(face)*2]];
 }
 
 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 {
-       switch(face)
-       {
-       case POSITIVE_X: return directions[3];
-       case NEGATIVE_X: return directions[3];
-       case POSITIVE_Y: return directions[4];
-       case NEGATIVE_Y: return directions[5];
-       case POSITIVE_Z: return directions[3];
-       case NEGATIVE_Z: return directions[3];
-       default: throw invalid_argument("TextureCube::get_t_direction");
-       }
+       return directions[orientations[get_face_index(face)*2+1]];
 }
 
 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)