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Merge pull request #8 from TomHarte/ArrayRestarts

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Switches to always filling GL-headed arrays from 0
This commit is contained in:
Thomas Harte 2016-05-09 19:23:03 -04:00
commit e532786f40
3 changed files with 29 additions and 33 deletions
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6
Outputs/CRT/Internals/CRTConstants.hpp
View File

@ -37,11 +37,11 @@ const GLsizei InputBufferBuilderHeight = 512;
// This is the size of the intermediate buffers used during composite to RGB conversion
const GLsizei IntermediateBufferWidth = 2048;
const GLsizei IntermediateBufferHeight = 512;
const GLsizei IntermediateBufferHeight = 1024;
// Some internal buffer sizes
const GLsizeiptr OutputVertexBufferDataSize = 6 * 8 * 312; // a multiple of 6 * OutputVertexSize
const GLsizeiptr SourceVertexBufferDataSize = 2 * 16 * 312; // a multiple of 2 * SourceVertexSize
const GLsizeiptr OutputVertexBufferDataSize = 6 * 8 * IntermediateBufferHeight; // a sufficient multiple of 6 * OutputVertexSize to draw from the entirety of an intermediate buffer
const GLsizeiptr SourceVertexBufferDataSize = 2 * 16 * IntermediateBufferHeight * 2; // a multiple of 2 * SourceVertexSize
}
}

48
Outputs/CRT/Internals/CRTOpenGL.cpp
View File

@ -78,24 +78,27 @@ static int getCircularRanges(GLsizei *start_pointer, GLsizei *end_pointer, GLsiz
}
}
static inline void drawArrayRanges(GLenum mode, GLsizei vertex_size, int number_of_ranges, Range *ranges)
static GLsizei submitArrayData(GLuint buffer, uint8_t *source, GLsizei *length_pointer, GLsizei chunk_size)
{
for(int c = 0; c < number_of_ranges; c++)
{
glDrawArrays(mode, ranges[c].location / vertex_size, ranges[c].length / vertex_size);
}
}
GLsizei length = *length_pointer;
GLsizei residue = length % chunk_size;
length -= residue;
static void submitArrayData(GLuint buffer, uint8_t *source, int number_of_ranges, Range *ranges)
{
glBindBuffer(GL_ARRAY_BUFFER, buffer);
for(int c = 0; c < number_of_ranges; c++)
{
uint8_t *data = (uint8_t *)glMapBufferRange(GL_ARRAY_BUFFER, ranges[c].location, ranges[c].length, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT | GL_MAP_FLUSH_EXPLICIT_BIT);
memcpy(data, &source[ranges[c].location], (size_t)ranges[c].length);
glFlushMappedBufferRange(GL_ARRAY_BUFFER, ranges[c].location, ranges[c].length);
uint8_t *data = (uint8_t *)glMapBufferRange(GL_ARRAY_BUFFER, 0, length, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT | GL_MAP_FLUSH_EXPLICIT_BIT);
memcpy(data, source, (size_t)length);
glFlushMappedBufferRange(GL_ARRAY_BUFFER, 0, length);
glUnmapBuffer(GL_ARRAY_BUFFER);
if(residue)
{
memmove(source, &source[length], (size_t)residue);
*length_pointer = residue;
}
else
*length_pointer = 0;
return length;
}
using namespace Outputs::CRT;
@ -119,9 +122,7 @@ OpenGLOutputBuilder::OpenGLOutputBuilder(unsigned int buffer_depth) :
_output_buffer_data(new uint8_t[OutputVertexBufferDataSize]),
_source_buffer_data(new uint8_t[SourceVertexBufferDataSize]),
_output_buffer_data_pointer(0),
_drawn_output_buffer_data_pointer(0),
_source_buffer_data_pointer(0),
_drawn_source_buffer_data_pointer(0),
_last_output_width(0),
_last_output_height(0),
_fence(nullptr)
@ -195,11 +196,8 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
}
// determine how many lines are newly reclaimed; they'll need to be cleared
Range clearing_zones[2], source_drawing_zones[2];
Range output_drawing_zones[2];
Range clearing_zones[2];
int number_of_clearing_zones = getCircularRanges(&_cleared_composite_output_y, &_composite_src_output_y, IntermediateBufferHeight, 1, clearing_zones);
int number_of_source_drawing_zones = getCircularRanges(&_drawn_source_buffer_data_pointer, &_source_buffer_data_pointer, SourceVertexBufferDataSize, 2*SourceVertexSize, source_drawing_zones);
int number_of_output_drawing_zones = getCircularRanges(&_drawn_output_buffer_data_pointer, &_output_buffer_data_pointer, OutputVertexBufferDataSize, 6*OutputVertexSize, output_drawing_zones);
uint16_t completed_texture_y = _buffer_builder->get_and_finalise_current_line();
if(_fence != nullptr)
@ -209,10 +207,10 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
}
// release the mapping, giving up on trying to draw if data has been lost
submitArrayData(output_array_buffer, _output_buffer_data.get(), number_of_output_drawing_zones, output_drawing_zones);
GLsizei submitted_output_data = submitArrayData(output_array_buffer, _output_buffer_data.get(), &_output_buffer_data_pointer, 6*OutputVertexSize);
// bind and flush the source array buffer
submitArrayData(source_array_buffer, _source_buffer_data.get(), number_of_source_drawing_zones, source_drawing_zones);
GLsizei submitted_source_data = submitArrayData(source_array_buffer, _source_buffer_data.get(), &_source_buffer_data_pointer, 2*SourceVertexSize);
// make sure there's a target to draw to
if(!framebuffer || framebuffer->get_height() != output_height || framebuffer->get_width() != output_width)
@ -268,7 +266,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
RenderStage *active_pipeline = (_output_device == Television || !rgb_input_shader_program) ? composite_render_stages : rgb_render_stages;
// for television, update intermediate buffers and then draw; for a monitor, just draw
if(number_of_source_drawing_zones)
if(submitted_source_data)
{
// all drawing will be from the source vertex array and without blending
glBindVertexArray(source_vertex_array);
@ -294,7 +292,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
}
// draw as desired
drawArrayRanges(GL_LINES, SourceVertexSize, number_of_source_drawing_zones, source_drawing_zones);
glDrawArrays(GL_LINES, 0, submitted_source_data / SourceVertexSize);
active_pipeline++;
}
@ -303,7 +301,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
// transfer to framebuffer
framebuffer->bind_framebuffer();
if(number_of_output_drawing_zones)
if(submitted_output_data)
{
glEnable(GL_BLEND);
@ -320,7 +318,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
output_shader_program->bind();
// draw
drawArrayRanges(GL_TRIANGLE_STRIP, OutputVertexSize, number_of_output_drawing_zones, output_drawing_zones);
glDrawArrays(GL_TRIANGLE_STRIP, 0, submitted_output_data / OutputVertexSize);
}
// copy framebuffer to the intended place

8
Outputs/CRT/Internals/CRTOpenGL.hpp
View File

@ -106,7 +106,7 @@ class OpenGLOutputBuilder {
inline uint8_t *get_next_source_run()
{
if(_source_buffer_data_pointer == _drawn_source_buffer_data_pointer + SourceVertexBufferDataSize) return nullptr;
if(_source_buffer_data_pointer == SourceVertexBufferDataSize) return nullptr;
return &_source_buffer_data.get()[_source_buffer_data_pointer % SourceVertexBufferDataSize];
}
@ -117,12 +117,12 @@ class OpenGLOutputBuilder {
inline bool composite_output_run_has_room_for_vertices(GLsizei vertices_to_write)
{
return _output_buffer_data_pointer <= _drawn_output_buffer_data_pointer + OutputVertexBufferDataSize - vertices_to_write * OutputVertexSize;
return _output_buffer_data_pointer <= OutputVertexBufferDataSize - vertices_to_write * OutputVertexSize;
}
inline uint8_t *get_next_output_run()
{
if(_output_buffer_data_pointer == _drawn_output_buffer_data_pointer + OutputVertexBufferDataSize) return nullptr;
if(_output_buffer_data_pointer == OutputVertexBufferDataSize) return nullptr;
return &_output_buffer_data.get()[_output_buffer_data_pointer % OutputVertexBufferDataSize];
}
@ -202,11 +202,9 @@ class OpenGLOutputBuilder {
std::unique_ptr<uint8_t> _source_buffer_data;
GLsizei _source_buffer_data_pointer;
GLsizei _drawn_source_buffer_data_pointer;
std::unique_ptr<uint8_t> _output_buffer_data;
GLsizei _output_buffer_data_pointer;
GLsizei _drawn_output_buffer_data_pointer;
GLsync _fence;
};