#include <epoxy/gl.h>
#include <stdio.h>
+#include <list>
#include <map>
#include <set>
#include <string>
OUTPUT_ORIGIN_TOP_LEFT,
};
+// Transformation to apply (if any) to pixel data in temporary buffers.
+// See set_intermediate_format() below for more information.
+enum FramebufferTransformation {
+ // The default; just store the value. This is what you usually want.
+ NO_FRAMEBUFFER_TRANSFORMATION,
+
+ // If the values are in linear light, store sqrt(x) to the framebuffer
+ // instead of x itself, of course undoing it with x² on read. Useful as
+ // a rough approximation to the sRGB curve. (If the values are not in
+ // linear light, just store them as-is.)
+ SQUARE_ROOT_FRAMEBUFFER_TRANSFORMATION,
+};
+
// A node in the graph; basically an effect and some associated information.
class Node {
public:
Node *output_node;
GLuint glsl_program_num; // Owned by the resource_pool.
+
+ // Position and texcoord attribute indexes, although it doesn't matter
+ // which is which, because they contain the same data.
+ std::set<GLint> attribute_indexes;
+
bool input_needs_mipmaps;
// Inputs are only inputs from other phases (ie., those that come from RTT);
std::vector<Uniform<Eigen::Matrix3d> > uniforms_mat3;
// For measurement of GPU time used.
- GLuint timer_query_object;
+ std::list<GLuint> timer_query_objects_running;
+ std::list<GLuint> timer_query_objects_free;
uint64_t time_elapsed_ns;
uint64_t num_measured_iterations;
};
inputs.push_back(input3);
return add_effect(effect, inputs);
}
+ Effect *add_effect(Effect *effect, Effect *input1, Effect *input2, Effect *input3, Effect *input4) {
+ std::vector<Effect *> inputs;
+ inputs.push_back(input1);
+ inputs.push_back(input2);
+ inputs.push_back(input3);
+ inputs.push_back(input4);
+ return add_effect(effect, inputs);
+ }
+ Effect *add_effect(Effect *effect, Effect *input1, Effect *input2, Effect *input3, Effect *input4, Effect *input5) {
+ std::vector<Effect *> inputs;
+ inputs.push_back(input1);
+ inputs.push_back(input2);
+ inputs.push_back(input3);
+ inputs.push_back(input4);
+ inputs.push_back(input5);
+ return add_effect(effect, inputs);
+ }
Effect *add_effect(Effect *effect, const std::vector<Effect *> &inputs);
- // Adds an RGBA output. Note that you can have at most one RGBA output and one
- // Y'CbCr output (see below for details).
+ // Adds an RGBA output. Note that you can have at most one RGBA output and two
+ // Y'CbCr outputs (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).
+ // Adds an YCbCr output. Note that you can only have at most two Y'CbCr
+ // outputs, and they must have the same <ycbcr_format> and <type>.
+ // (This limitation may be lifted in the future, to allow e.g. simultaneous
+ // 8- and 10-bit output. Currently, multiple Y'CbCr outputs are only
+ // useful in some very limited circumstances, like if one texture goes
+ // to some place you cannot easily read from later.)
+ //
+ // Only 4:4:4 output is supported due to fragment shader limitations,
+ // so chroma_subsampling_x and chroma_subsampling_y must both be 1.
+ // <type> should match the data type of the FBO you are rendering to,
+ // so that if you use 16-bit output (GL_UNSIGNED_SHORT), you will get
+ // 8-, 10- or 12-bit output correctly as determined by <ycbcr_format.num_levels>.
+ // Using e.g. ycbcr_format.num_levels == 1024 with GL_UNSIGNED_BYTE is
+ // nonsensical and invokes undefined behavior.
//
- // If you have both RGBA and Y'CbCr output, the RGBA output will come
+ // If you have both RGBA and Y'CbCr output(s), 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,
- YCbCrOutputSplitting output_splitting = YCBCR_OUTPUT_INTERLEAVED);
+ YCbCrOutputSplitting output_splitting = YCBCR_OUTPUT_INTERLEAVED,
+ GLenum output_type = GL_UNSIGNED_BYTE);
+
+ // Change Y'CbCr output format. (This can be done also after finalize()).
+ // Note that you are not allowed to change subsampling parameters;
+ // however, you can change the color space parameters, ie.,
+ // luma_coefficients, full_range and num_levels.
+ void change_ycbcr_output_format(const YCbCrFormat &ycbcr_format);
// Set number of output bits, to scale the dither.
// 8 is the right value for most outputs.
+ //
+ // Special note for 10- and 12-bit Y'CbCr packed into GL_UNSIGNED_SHORT:
+ // This is relative to the actual output, not the logical one, so you should
+ // specify 16 here, not 10 or 12.
+ //
// The default, 0, is a special value that means no dither.
void set_dither_bits(unsigned num_bits)
{
this->output_origin = output_origin;
}
+ // Set intermediate format for framebuffers used when we need to bounce
+ // to a temporary texture. The default, GL_RGBA16F, is good for most uses;
+ // it is precise, has good range, and is relatively efficient. However,
+ // if you need even more speed and your chain can do with some loss of
+ // accuracy, you can change the format here (before calling finalize).
+ // Calculations between bounce buffers are still in 32-bit floating-point
+ // no matter what you specify.
+ //
+ // Of special interest is GL_SRGB8_ALPHA8, which stores sRGB-encoded RGB
+ // and linear alpha; this is half the memory bandwidth of GL_RGBA16F,
+ // while retaining reasonable precision for typical image data. It will,
+ // however, cause some gamut clipping if your colorspace is far from sRGB,
+ // as it cannot represent values outside [0,1]. NOTE: If you construct
+ // a chain where you end up bouncing pixels in non-linear light
+ // (gamma different from GAMMA_LINEAR), this will be the wrong thing.
+ // However, it's hard to see how this could happen in a non-contrived
+ // chain; few effects ever need texture bounce or resizing without also
+ // combining multiple pixels, which really needs linear light and thus
+ // triggers a conversion before the bounce.
+ //
+ // If you don't need alpha (or can do with very little of it), GL_RGB10_A2
+ // is even better, as it has two more bits for each color component. There
+ // is no GL_SRGB10, unfortunately, so on its own, it is somewhat worse than
+ // GL_SRGB8, but you can set <transformation> to SQUARE_ROOT_FRAMEBUFFER_TRANSFORMATION,
+ // and sqrt(x) will be stored instead of x. This is a rough approximation to
+ // the sRGB curve, and reduces maximum error (in sRGB distance) by almost an
+ // order of magnitude, well below what you can get from 8-bit true sRGB.
+ // (Note that this strategy avoids the problem with bounced non-linear data
+ // above, since the square root is turned off in that case.) However, texture
+ // filtering will happen on the transformed values, so if you have heavy
+ // downscaling or the likes (e.g. mipmaps), you could get subtly bad results.
+ // You'll need to see which of the two that works the best for you in practice.
+ void set_intermediate_format(
+ GLenum intermediate_format,
+ FramebufferTransformation transformation = NO_FRAMEBUFFER_TRANSFORMATION)
+ {
+ this->intermediate_format = intermediate_format;
+ this->intermediate_transformation = transformation;
+ }
+
void finalize();
// Measure the GPU time used for each actual phase during rendering.
void reset_phase_timing();
void print_phase_timing();
- //void render(unsigned char *src, unsigned char *dst);
void render_to_screen()
{
render_to_fbo(0, 0, 0);
// single-sampler input, or from an RTT texture.
GLenum get_input_sampler(Node *node, unsigned input_num) const;
+ // Whether input <input_num> of <node> corresponds to a single sampler
+ // (see get_input_sampler()). Normally, you should not need to call this;
+ // however, if the input Effect has set override_texture_bounce(),
+ // this will return false, and you could be flexible and check it first
+ // if you want.
+ GLenum has_input_sampler(Node *node, unsigned input_num) const;
+
// Get the current resource pool assigned to this EffectChain.
// Primarily to let effects allocate textures as needed.
// Any resources you get from the pool must be returned to the pool
Phase *construct_phase(Node *output, std::map<Node *, Phase *> *completed_effects);
// Execute one phase, ie. set up all inputs, effects and outputs, and render the quad.
- void execute_phase(Phase *phase, bool last_phase, std::map<Phase *, GLuint> *output_textures, std::set<Phase *> *generated_mipmaps);
+ void execute_phase(Phase *phase, bool last_phase,
+ std::set<GLint> *bound__attribute_indices,
+ std::map<Phase *, GLuint> *output_textures,
+ std::set<Phase *> *generated_mipmaps);
// Set up uniforms for one phase. The program must already be bound.
void setup_uniforms(Phase *phase);
ImageFormat output_format;
OutputAlphaFormat output_alpha_format;
- 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.
+ bool output_color_rgba;
+ int num_output_color_ycbcr; // Max 2.
+ YCbCrFormat output_ycbcr_format; // If num_output_color_ycbcr is > 0.
+ GLenum output_ycbcr_type; // If num_output_color_ycbcr is > 0.
+ YCbCrOutputSplitting output_ycbcr_splitting[2]; // If num_output_color_ycbcr is > N.
std::vector<Node *> nodes;
std::map<Effect *, Node *> node_map;
Effect *dither_effect;
+ Node *ycbcr_conversion_effect_node;
std::vector<Input *> inputs; // Also contained in nodes.
std::vector<Phase *> phases;
+ GLenum intermediate_format;
+ FramebufferTransformation intermediate_transformation;
unsigned num_dither_bits;
OutputOrigin output_origin;
bool finalized;
+ GLuint vbo; // Contains vertex and texture coordinate data.
ResourcePool *resource_pool;
bool owns_resource_pool;
projects / movit / blobdiff