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Made an attempt to reduce the amount of data heading to the GPU.

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This commit is contained in:
Thomas Harte 2016-03-22 21:16:32 -04:00
parent 3038704977
commit 8cd5d40e00
5 changed files with 54 additions and 67 deletions
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111
Machines/Electron/Electron.cpp
View File

@ -504,16 +504,12 @@ inline void Machine::start_pixel_line()
}
_currentScreenAddress = _startLineAddress;
_current_pixel_column = 0;
if(!_isBlankLine)
{
_currentLine = _crt->allocate_write_area(640);
}
_current_output_target = nullptr;
}
inline void Machine::end_pixel_line()
{
if(!_isBlankLine) _crt->output_data(640, 1);
if(_current_output_target) _crt->output_data((unsigned int)((_current_output_target - _initial_output_target) * _current_output_divider), _current_output_divider);
_current_character_row++;
}
@ -525,6 +521,21 @@ inline void Machine::output_pixels(unsigned int number_of_cycles)
}
else
{
unsigned int divider = 0;
switch(_screen_mode)
{
case 0: case 3: divider = 1; break;
case 1: case 4: case 6: divider = 2; break;
case 2: case 5: divider = 4; break;
}
if(!_current_output_target || divider != _current_output_divider)
{
if(_current_output_target) _crt->output_data((unsigned int)((_current_output_target - _initial_output_target) * _current_output_divider), _current_output_divider);
_current_output_divider = divider;
_initial_output_target = _current_output_target = _crt->allocate_write_area(640 / _current_output_divider);
}
while(number_of_cycles--)
{
if(!(_current_pixel_column&1) || _screen_mode < 4)
@ -543,40 +554,33 @@ inline void Machine::output_pixels(unsigned int number_of_cycles)
case 3:
case 0:
{
_currentLine[0] = _palette[(_last_pixel_byte&0x80) >> 4];
_currentLine[1] = _palette[(_last_pixel_byte&0x40) >> 3];
_currentLine[2] = _palette[(_last_pixel_byte&0x20) >> 2];
_currentLine[3] = _palette[(_last_pixel_byte&0x10) >> 1];
_currentLine[4] = _palette[(_last_pixel_byte&0x08) >> 0];
_currentLine[5] = _palette[(_last_pixel_byte&0x04) << 1];
_currentLine[6] = _palette[(_last_pixel_byte&0x02) << 2];
_currentLine[7] = _palette[(_last_pixel_byte&0x01) << 3];
_current_output_target[0] = _palette[(_last_pixel_byte&0x80) >> 4];
_current_output_target[1] = _palette[(_last_pixel_byte&0x40) >> 3];
_current_output_target[2] = _palette[(_last_pixel_byte&0x20) >> 2];
_current_output_target[3] = _palette[(_last_pixel_byte&0x10) >> 1];
_current_output_target[4] = _palette[(_last_pixel_byte&0x08) >> 0];
_current_output_target[5] = _palette[(_last_pixel_byte&0x04) << 1];
_current_output_target[6] = _palette[(_last_pixel_byte&0x02) << 2];
_current_output_target[7] = _palette[(_last_pixel_byte&0x01) << 3];
_current_output_target += 8;
}
break;
case 1:
{
_currentLine[0] =
_currentLine[1] = _palette[((_last_pixel_byte&0x80) >> 4) | ((_last_pixel_byte&0x08) >> 2)];
_currentLine[2] =
_currentLine[3] = _palette[((_last_pixel_byte&0x40) >> 3) | ((_last_pixel_byte&0x04) >> 1)];
_currentLine[4] =
_currentLine[5] = _palette[((_last_pixel_byte&0x20) >> 2) | ((_last_pixel_byte&0x02) >> 0)];
_currentLine[6] =
_currentLine[7] = _palette[((_last_pixel_byte&0x10) >> 1) | ((_last_pixel_byte&0x01) << 1)];
_current_output_target[0] = _palette[((_last_pixel_byte&0x80) >> 4) | ((_last_pixel_byte&0x08) >> 2)];
_current_output_target[1] = _palette[((_last_pixel_byte&0x40) >> 3) | ((_last_pixel_byte&0x04) >> 1)];
_current_output_target[2] = _palette[((_last_pixel_byte&0x20) >> 2) | ((_last_pixel_byte&0x02) >> 0)];
_current_output_target[3] = _palette[((_last_pixel_byte&0x10) >> 1) | ((_last_pixel_byte&0x01) << 1)];
_current_output_target += 4;
}
break;
case 2:
{
_currentLine[0] =
_currentLine[1] =
_currentLine[2] =
_currentLine[3] = _palette[((_last_pixel_byte&0x80) >> 4) | ((_last_pixel_byte&0x20) >> 3) | ((_last_pixel_byte&0x08) >> 2) | ((_last_pixel_byte&0x02) >> 1)];
_currentLine[4] =
_currentLine[5] =
_currentLine[6] =
_currentLine[7] = _palette[((_last_pixel_byte&0x40) >> 3) | ((_last_pixel_byte&0x10) >> 2) | ((_last_pixel_byte&0x04) >> 1) | ((_last_pixel_byte&0x01) >> 0)];
_current_output_target[0] = _palette[((_last_pixel_byte&0x80) >> 4) | ((_last_pixel_byte&0x20) >> 3) | ((_last_pixel_byte&0x08) >> 2) | ((_last_pixel_byte&0x02) >> 1)];
_current_output_target[1] = _palette[((_last_pixel_byte&0x40) >> 3) | ((_last_pixel_byte&0x10) >> 2) | ((_last_pixel_byte&0x04) >> 1) | ((_last_pixel_byte&0x01) >> 0)];
_current_output_target += 2;
}
break;
@ -585,26 +589,19 @@ inline void Machine::output_pixels(unsigned int number_of_cycles)
{
if(_current_pixel_column&1)
{
_currentLine[0] =
_currentLine[1] = _palette[(_last_pixel_byte&0x08) >> 0];
_currentLine[2] =
_currentLine[3] = _palette[(_last_pixel_byte&0x04) << 1];
_currentLine[4] =
_currentLine[5] = _palette[(_last_pixel_byte&0x02) << 2];
_currentLine[6] =
_currentLine[7] = _palette[(_last_pixel_byte&0x01) << 3];
_current_output_target[0] = _palette[(_last_pixel_byte&0x08) >> 0];
_current_output_target[1] = _palette[(_last_pixel_byte&0x04) << 1];
_current_output_target[2] = _palette[(_last_pixel_byte&0x02) << 2];
_current_output_target[3] = _palette[(_last_pixel_byte&0x01) << 3];
}
else
{
_currentLine[0] =
_currentLine[1] = _palette[(_last_pixel_byte&0x80) >> 4];
_currentLine[2] =
_currentLine[3] = _palette[(_last_pixel_byte&0x40) >> 3];
_currentLine[4] =
_currentLine[5] = _palette[(_last_pixel_byte&0x20) >> 2];
_currentLine[6] =
_currentLine[7] = _palette[(_last_pixel_byte&0x10) >> 1];
_current_output_target[0] = _palette[(_last_pixel_byte&0x80) >> 4];
_current_output_target[1] = _palette[(_last_pixel_byte&0x40) >> 3];
_current_output_target[2] = _palette[(_last_pixel_byte&0x20) >> 2];
_current_output_target[3] = _palette[(_last_pixel_byte&0x10) >> 1];
}
_current_output_target += 4;
}
break;
@ -612,32 +609,20 @@ inline void Machine::output_pixels(unsigned int number_of_cycles)
{
if(_current_pixel_column&1)
{
_currentLine[0] =
_currentLine[1] =
_currentLine[2] =
_currentLine[3] = _palette[((_last_pixel_byte&0x20) >> 2) | ((_last_pixel_byte&0x02) >> 0)];
_currentLine[4] =
_currentLine[5] =
_currentLine[6] =
_currentLine[7] = _palette[((_last_pixel_byte&0x10) >> 1) | ((_last_pixel_byte&0x01) << 1)];
_current_output_target[0] = _palette[((_last_pixel_byte&0x20) >> 2) | ((_last_pixel_byte&0x02) >> 0)];
_current_output_target[1] = _palette[((_last_pixel_byte&0x10) >> 1) | ((_last_pixel_byte&0x01) << 1)];
}
else
{
_currentLine[0] =
_currentLine[1] =
_currentLine[2] =
_currentLine[3] = _palette[((_last_pixel_byte&0x80) >> 4) | ((_last_pixel_byte&0x08) >> 2)];
_currentLine[4] =
_currentLine[5] =
_currentLine[6] =
_currentLine[7] = _palette[((_last_pixel_byte&0x40) >> 3) | ((_last_pixel_byte&0x04) >> 1)];
_current_output_target[0] = _palette[((_last_pixel_byte&0x80) >> 4) | ((_last_pixel_byte&0x08) >> 2)];
_current_output_target[1] = _palette[((_last_pixel_byte&0x40) >> 3) | ((_last_pixel_byte&0x04) >> 1)];
}
_current_output_target += 2;
}
break;
}
_current_pixel_column++;
_currentLine += 8;
}
}
}

3
Machines/Electron/Electron.hpp
View File

@ -197,7 +197,8 @@ class Machine: public CPU6502::Processor<Machine>, Tape::Delegate {
bool _isBlankLine;
// CRT output
uint8_t *_currentLine;
uint8_t *_current_output_target, *_initial_output_target;
unsigned int _current_output_divider;
// Tape.
Tape _tape;

1
Outputs/CRT/Internals/CRTConstants.hpp
View File

@ -43,7 +43,6 @@ const int IntermediateBufferHeight = 2048;
// Some internal
const GLsizeiptr InputVertexBufferDataSize = 262080; // a multiple of 6 * OutputVertexSize
const GLsizeiptr InputTextureBufferDataSize = InputBufferBuilderWidth*InputBufferBuilderHeight;
// Runs are divided discretely by vertical syncs in order to put a usable bounds on the uniform used to track

5
Outputs/CRT/Internals/CRTOpenGL.cpp
View File

@ -87,7 +87,8 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
GLenum format = formatForDepth(_buffer_builder->bytes_per_pixel);
glGenBuffers(1, &_input_texture_array);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, _input_texture_array);
glBufferData(GL_PIXEL_UNPACK_BUFFER, InputTextureBufferDataSize, NULL, GL_STREAM_DRAW);
_input_texture_array_size = (GLsizeiptr)(InputBufferBuilderWidth * InputBufferBuilderHeight * _buffer_builder->bytes_per_pixel);
glBufferData(GL_PIXEL_UNPACK_BUFFER, _input_texture_array_size, NULL, GL_STREAM_DRAW);
glTexImage2D(GL_TEXTURE_2D, 0, (GLint)format, InputBufferBuilderWidth, InputBufferBuilderHeight, 0, format, GL_UNSIGNED_BYTE, nullptr);
@ -219,7 +220,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
// drawing commands having been issued, reclaim the array buffer pointer
_buffer_builder->move_to_new_line();
_output_buffer_data = (uint8_t *)glMapBufferRange(GL_ARRAY_BUFFER, 0, InputVertexBufferDataSize, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT);
_input_texture_data = (uint8_t *)glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, InputTextureBufferDataSize, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT);
_input_texture_data = (uint8_t *)glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, _input_texture_array_size, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT);
_output_mutex->unlock();
}

1
Outputs/CRT/Internals/CRTOpenGL.hpp
View File

@ -207,6 +207,7 @@ class OpenGLOutputBuilder {
uint8_t *_input_texture_data;
GLuint _input_texture_array;
GLsync _input_texture_sync;
GLsizeiptr _input_texture_array_size;
uint8_t *_output_buffer_data;
size_t _output_buffer_data_pointer;