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https://github.com/TomHarte/CLK.git
synced 2024-08-29 11:29:52 +00:00
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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@ -95,7 +95,6 @@ OpenGLOutputBuilder::OpenGLOutputBuilder(unsigned int buffer_depth) :
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// create the output vertex array
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glGenVertexArrays(1, &output_vertex_array);
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glBindVertexArray(output_vertex_array);
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// create a buffer for output vertex attributes
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glGenBuffers(1, &output_array_buffer);
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@ -105,6 +104,9 @@ OpenGLOutputBuilder::OpenGLOutputBuilder(unsigned int buffer_depth) :
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// map that buffer too, for any CRT activity that may occur before the first draw
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_output_buffer_data = (uint8_t *)glMapBufferRange(GL_ARRAY_BUFFER, 0, OutputVertexBufferDataSize, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT);
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// create the source vertex array
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glGenVertexArrays(1, &source_vertex_array);
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// create a buffer for source vertex attributes
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glGenBuffers(1, &source_array_buffer);
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glBindBuffer(GL_ARRAY_BUFFER, source_array_buffer);
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@ -170,6 +172,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
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// upload more source pixel data if any; we'll always resubmit the last line submitted last
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// time as it may have had extra data appended to it
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glBindTexture(GL_TEXTURE_2D, textureName);
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if(_buffer_builder->_next_write_y_position < _buffer_builder->last_uploaded_line)
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{
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glTexSubImage2D( GL_TEXTURE_2D, 0,
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@ -204,6 +207,39 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
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// glBindTexture(GL_TEXTURE_2D, _openGL_state->textureName);
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// glGetIntegerv(GL_VIEWPORT, results);
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if(_output_device == Television)
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{
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composite_input_shader_program->bind();
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glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
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glBindVertexArray(source_vertex_array);
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// clear the buffer
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glClear(GL_COLOR_BUFFER_BIT);
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// decide how much to draw
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if(_drawn_source_buffer_data_pointer != _source_buffer_data_pointer)
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{
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size_t new_data_size = _drawn_source_buffer_data_pointer - _source_buffer_data_pointer;
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size_t new_data_start = _drawn_source_buffer_data_pointer;
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_source_buffer_data_pointer %= SourceVertexBufferDataSize;
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_drawn_source_buffer_data_pointer = _source_buffer_data_pointer;
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if(new_data_size >= SourceVertexBufferDataSize)
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{
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new_data_size = SourceVertexBufferDataSize;
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new_data_start = 0;
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}
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size_t first_data_length = std::max(SourceVertexBufferDataSize - new_data_start, new_data_size);
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glDrawArrays(GL_LINES, (GLint)(new_data_start / SourceVertexSize), (GLsizei)(first_data_length / SourceVertexSize));
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if(new_data_size > first_data_length)
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{
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glDrawArrays(GL_LINES, 0, (GLsizei)((new_data_size - first_data_length) / SourceVertexSize));
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}
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}
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} else
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// switch to the output shader
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if(rgb_shader_program)
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{
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@ -497,6 +533,8 @@ void OpenGLOutputBuilder::prepare_source_vertex_array()
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GLint phaseAndAmplitudeAttribute = composite_input_shader_program->get_attrib_location("phaseAndAmplitude");
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GLint phaseTimeAttribute = composite_input_shader_program->get_attrib_location("phaseTime");
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glBindVertexArray(source_vertex_array);
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glEnableVertexAttribArray((GLuint)inputPositionAttribute);
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glEnableVertexAttribArray((GLuint)outputPositionAttribute);
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glEnableVertexAttribArray((GLuint)phaseAndAmplitudeAttribute);
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@ -605,6 +643,8 @@ void OpenGLOutputBuilder::prepare_output_vertex_array()
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GLint lateralAttribute = rgb_shader_program->get_attrib_location("lateralAndTimestampBaseOffset");
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GLint timestampAttribute = rgb_shader_program->get_attrib_location("timestamp");
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glBindVertexArray(output_vertex_array);
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glEnableVertexAttribArray((GLuint)positionAttribute);
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glEnableVertexAttribArray((GLuint)textureCoordinatesAttribute);
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glEnableVertexAttribArray((GLuint)lateralAttribute);
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@ -76,7 +76,7 @@ class OpenGLOutputBuilder {
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std::unique_ptr<OpenGL::Shader> composite_input_shader_program, composite_output_shader_program;
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GLuint output_array_buffer, output_vertex_array;
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GLuint source_array_buffer;
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GLuint source_array_buffer, source_vertex_array;
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GLint windowSizeUniform, timestampBaseUniform;
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GLint boundsOriginUniform, boundsSizeUniform;
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@ -108,12 +108,12 @@ class OpenGLOutputBuilder {
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inline uint8_t *get_next_source_run()
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{
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_output_mutex->lock();
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return &_source_buffer_data[_source_buffer_data_pointer];
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return &_source_buffer_data[_source_buffer_data_pointer % SourceVertexBufferDataSize];
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}
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inline void complete_source_run()
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{
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_source_buffer_data_pointer = (_source_buffer_data_pointer + 2 * SourceVertexSize) % SourceVertexBufferDataSize;
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_source_buffer_data_pointer += 2 * SourceVertexSize;;
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_output_mutex->unlock();
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}
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@ -219,6 +219,7 @@ class OpenGLOutputBuilder {
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uint8_t *_source_buffer_data;
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size_t _source_buffer_data_pointer;
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size_t _drawn_source_buffer_data_pointer;
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};
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}
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