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Added first attempt at performing the first step of television output: mapping from source data to the first of the processing buffers. It's immediately obvious that my eye coordinates are off.

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This commit is contained in:
Thomas Harte 2016-04-17 17:17:59 -04:00
parent abce0ed3c4
commit ece51917fa
2 changed files with 45 additions and 4 deletions
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42
Outputs/CRT/Internals/CRTOpenGL.cpp
View File

@ -95,7 +95,6 @@ OpenGLOutputBuilder::OpenGLOutputBuilder(unsigned int buffer_depth) :
// create the output vertex array
glGenVertexArrays(1, &output_vertex_array);
glBindVertexArray(output_vertex_array);
// create a buffer for output vertex attributes
glGenBuffers(1, &output_array_buffer);
@ -105,6 +104,9 @@ OpenGLOutputBuilder::OpenGLOutputBuilder(unsigned int buffer_depth) :
// map that buffer too, for any CRT activity that may occur before the first draw
_output_buffer_data = (uint8_t *)glMapBufferRange(GL_ARRAY_BUFFER, 0, OutputVertexBufferDataSize, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT);
// create the source vertex array
glGenVertexArrays(1, &source_vertex_array);
// create a buffer for source vertex attributes
glGenBuffers(1, &source_array_buffer);
glBindBuffer(GL_ARRAY_BUFFER, source_array_buffer);
@ -170,6 +172,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
// upload more source pixel data if any; we'll always resubmit the last line submitted last
// time as it may have had extra data appended to it
glBindTexture(GL_TEXTURE_2D, textureName);
if(_buffer_builder->_next_write_y_position < _buffer_builder->last_uploaded_line)
{
glTexSubImage2D( GL_TEXTURE_2D, 0,
@ -204,6 +207,39 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
// glBindTexture(GL_TEXTURE_2D, _openGL_state->textureName);
// glGetIntegerv(GL_VIEWPORT, results);
if(_output_device == Television)
{
composite_input_shader_program->bind();
glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
glBindVertexArray(source_vertex_array);
// clear the buffer
glClear(GL_COLOR_BUFFER_BIT);
// decide how much to draw
if(_drawn_source_buffer_data_pointer != _source_buffer_data_pointer)
{
size_t new_data_size = _drawn_source_buffer_data_pointer - _source_buffer_data_pointer;
size_t new_data_start = _drawn_source_buffer_data_pointer;
_source_buffer_data_pointer %= SourceVertexBufferDataSize;
_drawn_source_buffer_data_pointer = _source_buffer_data_pointer;
if(new_data_size >= SourceVertexBufferDataSize)
{
new_data_size = SourceVertexBufferDataSize;
new_data_start = 0;
}
size_t first_data_length = std::max(SourceVertexBufferDataSize - new_data_start, new_data_size);
glDrawArrays(GL_LINES, (GLint)(new_data_start / SourceVertexSize), (GLsizei)(first_data_length / SourceVertexSize));
if(new_data_size > first_data_length)
{
glDrawArrays(GL_LINES, 0, (GLsizei)((new_data_size - first_data_length) / SourceVertexSize));
}
}
} else
// switch to the output shader
if(rgb_shader_program)
{
@ -497,6 +533,8 @@ void OpenGLOutputBuilder::prepare_source_vertex_array()
GLint phaseAndAmplitudeAttribute = composite_input_shader_program->get_attrib_location("phaseAndAmplitude");
GLint phaseTimeAttribute = composite_input_shader_program->get_attrib_location("phaseTime");
glBindVertexArray(source_vertex_array);
glEnableVertexAttribArray((GLuint)inputPositionAttribute);
glEnableVertexAttribArray((GLuint)outputPositionAttribute);
glEnableVertexAttribArray((GLuint)phaseAndAmplitudeAttribute);
@ -605,6 +643,8 @@ void OpenGLOutputBuilder::prepare_output_vertex_array()
GLint lateralAttribute = rgb_shader_program->get_attrib_location("lateralAndTimestampBaseOffset");
GLint timestampAttribute = rgb_shader_program->get_attrib_location("timestamp");
glBindVertexArray(output_vertex_array);
glEnableVertexAttribArray((GLuint)positionAttribute);
glEnableVertexAttribArray((GLuint)textureCoordinatesAttribute);
glEnableVertexAttribArray((GLuint)lateralAttribute);

7
Outputs/CRT/Internals/CRTOpenGL.hpp
View File

@ -76,7 +76,7 @@ class OpenGLOutputBuilder {
std::unique_ptr<OpenGL::Shader> composite_input_shader_program, composite_output_shader_program;
GLuint output_array_buffer, output_vertex_array;
GLuint source_array_buffer;
GLuint source_array_buffer, source_vertex_array;
GLint windowSizeUniform, timestampBaseUniform;
GLint boundsOriginUniform, boundsSizeUniform;
@ -108,12 +108,12 @@ class OpenGLOutputBuilder {
inline uint8_t *get_next_source_run()
{
_output_mutex->lock();
return &_source_buffer_data[_source_buffer_data_pointer];
return &_source_buffer_data[_source_buffer_data_pointer % SourceVertexBufferDataSize];
}
inline void complete_source_run()
{
_source_buffer_data_pointer = (_source_buffer_data_pointer + 2 * SourceVertexSize) % SourceVertexBufferDataSize;
_source_buffer_data_pointer += 2 * SourceVertexSize;;
_output_mutex->unlock();
}
@ -219,6 +219,7 @@ class OpenGLOutputBuilder {
uint8_t *_source_buffer_data;
size_t _source_buffer_data_pointer;
size_t _drawn_source_buffer_data_pointer;
};
}