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Switched back to a single array and vertex buffer.

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This commit is contained in:
Thomas Harte 2016-02-21 22:54:55 -05:00
parent 2b8fb5b615
commit 4b28e7b974
1 changed files with 33 additions and 19 deletions
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50
Outputs/CRT/CRTOpenGL.cpp
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@ -17,7 +17,8 @@ using namespace Outputs;
struct CRT::OpenGLState {
std::unique_ptr<OpenGL::Shader> shaderProgram;
GLuint arrayBuffers[kCRTNumberOfFrames], vertexArrays[kCRTNumberOfFrames];
GLuint arrayBuffer, vertexArray;
size_t verticesPerSlice;
GLint positionAttribute;
GLint textureCoordinatesAttribute;
@ -79,17 +80,15 @@ void CRT::draw_frame(unsigned int output_width, unsigned int output_height, bool
GLenum format = formatForDepth(_buffer_builder->buffers[0].bytes_per_pixel);
glTexImage2D(GL_TEXTURE_2D, 0, (GLint)format, CRTInputBufferBuilderWidth, CRTInputBufferBuilderHeight, 0, format, GL_UNSIGNED_BYTE, _buffer_builder->buffers[0].data);
glGenVertexArrays(kCRTNumberOfFrames, _openGL_state->vertexArrays);
glGenBuffers(kCRTNumberOfFrames, _openGL_state->arrayBuffers);
glGenVertexArrays(1, &_openGL_state->vertexArray);
glGenBuffers(1, &_openGL_state->arrayBuffer);
_openGL_state->verticesPerSlice = 0;
prepare_shader();
for(int c = 0; c < kCRTNumberOfFrames; c++)
{
glBindBuffer(GL_ARRAY_BUFFER, _openGL_state->arrayBuffers[c]);
glBindVertexArray(_openGL_state->vertexArrays[c]);
glBindBuffer(GL_ARRAY_BUFFER, _openGL_state->arrayBuffer);
glBindVertexArray(_openGL_state->vertexArray);
prepare_vertex_array();
}
glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint *)&_openGL_state->defaultFramebuffer);
@ -130,8 +129,27 @@ void CRT::draw_frame(unsigned int output_width, unsigned int output_height, bool
_buffer_builder->last_uploaded_line = _buffer_builder->_next_write_y_position;
}
// ensure array buffer is up to date
size_t max_number_of_vertices = 0;
for(int c = 0; c < kCRTNumberOfFrames; c++)
{
max_number_of_vertices = std::max(max_number_of_vertices, _run_builders[c]->number_of_vertices);
}
if(_openGL_state->verticesPerSlice < max_number_of_vertices)
{
_openGL_state->verticesPerSlice = max_number_of_vertices;
glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)(max_number_of_vertices * kCRTSizeOfVertex * kCRTNumberOfFrames), NULL, GL_DYNAMIC_DRAW);
for(unsigned int c = 0; c < kCRTNumberOfFrames; c++)
{
uint8_t *data = &_run_builders[c]->_input_runs[0];
glBufferSubData(GL_ARRAY_BUFFER, (GLsizeiptr)(c * _openGL_state->verticesPerSlice * kCRTSizeOfVertex), (GLsizeiptr)(_run_builders[c]->number_of_vertices * kCRTSizeOfVertex), data);
_run_builders[c]->uploaded_vertices = _run_builders[c]->number_of_vertices;
}
}
// draw all sitting frames
int run = _run_write_pointer;
unsigned int run = (unsigned int)_run_write_pointer;
// printf("%d: %zu v %zu\n", run, _run_builders[run]->uploaded_vertices, _run_builders[run]->number_of_vertices);
GLint total_age = 0;
for(int c = 0; c < kCRTNumberOfFrames; c++)
@ -143,21 +161,17 @@ void CRT::draw_frame(unsigned int output_width, unsigned int output_height, bool
{
glUniform1f(_openGL_state->timestampBaseUniform, (GLfloat)total_age);
// bind the vertex array
glBindVertexArray(_openGL_state->vertexArrays[run]);
// bind this frame's array buffer
glBindBuffer(GL_ARRAY_BUFFER, _openGL_state->arrayBuffers[run]);
if(_run_builders[run]->uploaded_vertices != _run_builders[run]->number_of_vertices)
{
// glBufferSubData can only replace existing data, not grow the pool, so for now we'll just take this hit
uint8_t *data = &_run_builders[run]->_input_runs[0];
glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)(_run_builders[run]->number_of_vertices * kCRTSizeOfVertex), data, GL_DYNAMIC_DRAW);
uint8_t *data = &_run_builders[run]->_input_runs[_run_builders[run]->uploaded_vertices * kCRTSizeOfVertex];
glBufferSubData(GL_ARRAY_BUFFER,
(GLsizeiptr)(((run * _openGL_state->verticesPerSlice) + _run_builders[run]->uploaded_vertices) * kCRTSizeOfVertex),
(GLsizeiptr)((_run_builders[run]->number_of_vertices - _run_builders[run]->uploaded_vertices) * kCRTSizeOfVertex), data);
_run_builders[run]->uploaded_vertices = _run_builders[run]->number_of_vertices;
}
// draw this frame
glDrawArrays(GL_TRIANGLES, 0, (GLsizei)_run_builders[run]->number_of_vertices);
glDrawArrays(GL_TRIANGLES, (GLint)(run * _openGL_state->verticesPerSlice), (GLsizei)_run_builders[run]->number_of_vertices);
}
// advance back in time