OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED,
};
+// RGBA output is nearly always packed; Y'CbCr, however, is often planar
+// due to chroma subsampling. This enum controls how add_ycbcr_output()
+// distributes the color channels between the fragment shader outputs.
+// Obviously, anything except YCBCR_OUTPUT_INTERLEAVED will be meaningless
+// unless you use render_to_fbo() and have an FBO with multiple render
+// targets attached (the other outputs will be discarded).
+enum YCbCrOutputSplitting {
+ // Only one output: Store Y'CbCr into the first three output channels,
+ // respectively, plus alpha. This is also called “chunked” or
+ // ”packed” mode.
+ YCBCR_OUTPUT_INTERLEAVED,
+
+ // Store Y' and alpha into the first output (in the red and alpha
+ // channels; effect to the others is undefined), and Cb and Cr into
+ // the first two channels of the second output. This is particularly
+ // useful if you want to end up in a format like NV12, where all the
+ // Y' samples come first and then Cb and Cr come interlevaed afterwards.
+ // You will still need to do the chroma subsampling yourself to actually
+ // get down to NV12, though.
+ YCBCR_OUTPUT_SPLIT_Y_AND_CBCR,
+
+ // Store Y' and alpha into the first output, Cb into the first channel
+ // of the second output and Cr into the first channel of the third output.
+ // (Effect on the other channels is undefined.) Essentially gives you
+ // 4:4:4 planar, or ”yuv444p”.
+ YCBCR_OUTPUT_PLANAR,
+};
+
+// Where (0,0) is taken to be in the output. If you want to render to an
+// OpenGL screen, you should keep the default of bottom-left, as that is
+// OpenGL's natural coordinate system. However, there are cases, such as if you
+// render to an FBO and read the pixels back into some other system, where
+// you'd want a top-left origin; if so, an additional flip step will be added
+// at the very end (but done in a vertex shader, so it will have zero extra
+// cost).
+//
+// Note that Movit's coordinate system in general consistently puts (0,0) in
+// the top left for _input_, no matter what you set as output origin.
+enum OutputOrigin {
+ OUTPUT_ORIGIN_BOTTOM_LEFT,
+ OUTPUT_ORIGIN_TOP_LEFT,
+};
+
// A node in the graph; basically an effect and some associated information.
class Node {
public:
// Inputs are only inputs from other phases (ie., those that come from RTT);
// input textures are counted as part of <effects>.
std::vector<Phase *> inputs;
+ // Bound sampler numbers for each input. Redundant in a sense
+ // (it always corresponds to the index), but we need somewhere
+ // to hold the value for the uniform.
+ std::vector<int> input_samplers;
std::vector<Node *> effects; // In order.
unsigned output_width, output_height, virtual_output_width, virtual_output_height;
}
Effect *add_effect(Effect *effect, const std::vector<Effect *> &inputs);
- // Adds an RGB output. Note that you can only have one output.
+ // Adds an RGBA output. Note that you can have at most one RGBA output and one
+ // Y'CbCr output (see below for details).
void add_output(const ImageFormat &format, OutputAlphaFormat alpha_format);
// Adds an YCbCr output. Note that you can only have one output.
// Currently, only chunked packed output is supported, and only 4:4:4
// (so chroma_subsampling_x and chroma_subsampling_y must both be 1).
+ //
+ // If you have both RGBA and Y'CbCr output, the RGBA output will come
+ // in the last draw buffer. Also, <format> and <alpha_format> must be
+ // identical between the two.
void add_ycbcr_output(const ImageFormat &format, OutputAlphaFormat alpha_format,
- const YCbCrFormat &ycbcr_format);
+ const YCbCrFormat &ycbcr_format,
+ YCbCrOutputSplitting output_splitting = YCBCR_OUTPUT_INTERLEAVED);
// Set number of output bits, to scale the dither.
// 8 is the right value for most outputs.
this->num_dither_bits = num_bits;
}
+ // Set where (0,0) is taken to be in the output. The default is
+ // OUTPUT_ORIGIN_BOTTOM_LEFT, which is usually what you want
+ // (see OutputOrigin above for more details).
+ void set_output_origin(OutputOrigin output_origin)
+ {
+ this->output_origin = output_origin;
+ }
+
void finalize();
// Measure the GPU time used for each actual phase during rendering.
// Set up uniforms for one phase. The program must already be bound.
void setup_uniforms(Phase *phase);
- // Set up the given sampler number for sampling from an RTT texture,
- // and bind it to "tex_" plus the given GLSL variable.
- void setup_rtt_sampler(GLuint glsl_program_num, int sampler_num, const std::string &effect_id, bool use_mipmaps);
+ // Set up the given sampler number for sampling from an RTT texture.
+ void setup_rtt_sampler(int sampler_num, bool use_mipmaps);
// Output the current graph to the given file in a Graphviz-compatible format;
// only useful for debugging.
ImageFormat output_format;
OutputAlphaFormat output_alpha_format;
- enum OutputColorType { OUTPUT_COLOR_RGB, OUTPUT_COLOR_YCBCR };
- OutputColorType output_color_type;
- YCbCrFormat output_ycbcr_format; // If output_color_type == OUTPUT_COLOR_YCBCR.
+ bool output_color_rgba, output_color_ycbcr;
+ YCbCrFormat output_ycbcr_format; // If output_color_ycbcr is true.
+ YCbCrOutputSplitting output_ycbcr_splitting; // If output_color_ycbcr is true.
std::vector<Node *> nodes;
std::map<Effect *, Node *> node_map;
std::vector<Phase *> phases;
unsigned num_dither_bits;
+ OutputOrigin output_origin;
bool finalized;
ResourcePool *resource_pool;
projects / movit / blobdiff