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With a little more debug logging, discovered an issue with incrementing by four.

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This commit is contained in:
Thomas Harte
2019-02-09 22:45:20 -05:00
parent d341f98b09
commit c94acb1ca2
3 changed files with 52 additions and 29 deletions
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Outputs/OpenGL/ScanTarget.cpp
+29 -22
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@@ -23,9 +23,6 @@ constexpr GLenum SourceDataTextureUnit = GL_TEXTURE0;
/// The texture unit which contains raw line-by-line composite, S-Video or RGB data.
constexpr GLenum UnprocessedLineBufferTextureUnit = GL_TEXTURE1;
/// The texture unit that contains the current display.
constexpr GLenum AccumulationTextureUnit = GL_TEXTURE3;
/// The texture unit that contains a pre-lowpass-filtered but fixed-resolution version of the chroma signal;
/// this is used when processing composite video only, and for chroma information only. Luminance is calculated
/// at the fidelity permitted by the output target, but my efforts to separate, demodulate and filter
@@ -33,6 +30,9 @@ constexpr GLenum AccumulationTextureUnit = GL_TEXTURE3;
/// noise that sampling reduces into a Moire, have proven to be unsuccessful for the time being.
constexpr GLenum QAMChromaTextureUnit = GL_TEXTURE2;
/// The texture unit that contains the current display.
constexpr GLenum AccumulationTextureUnit = GL_TEXTURE3;
#define TextureAddress(x, y) (((y) << 11) | (x))
#define TextureAddressGetY(v) uint16_t((v) >> 11)
#define TextureAddressGetX(v) uint16_t((v) & 0x7ff)
@@ -506,37 +506,37 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
stencil_is_valid_ = false;
}
// Figure out how many new spans are ostensible ready; use two less than that.
uint16_t new_spans = (submit_pointers.line + LineBufferHeight - read_pointers.line) % LineBufferHeight;
if(new_spans) {
// Figure out how many new lines are ready.
uint16_t new_lines = (submit_pointers.line + LineBufferHeight - read_pointers.line) % LineBufferHeight;
if(new_lines) {
// Prepare to output lines.
glBindVertexArray(line_vertex_array_);
// Bind the accumulation framebuffer, unless there's going to be QAM work.
if(!qam_separation_shader_) {
accumulation_texture_->bind_framebuffer();
}
output_shader_->bind();
// Enable blending and stenciling, and ensure spans increment the stencil buffer.
glEnable(GL_BLEND);
glEnable(GL_STENCIL_TEST);
// Enable blending and stenciling, and ensure spans increment the stencil buffer.
glEnable(GL_BLEND);
glEnable(GL_STENCIL_TEST);
}
glStencilFunc(GL_EQUAL, 0, GLuint(~0));
glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
// Prepare to output lines.
glBindVertexArray(line_vertex_array_);
output_shader_->bind();
// Prepare to upload data that will consitute lines.
glBindBuffer(GL_ARRAY_BUFFER, line_buffer_name_);
// Divide spans by which frame they're in.
uint16_t start_line = read_pointers.line;
while(new_spans) {
while(new_lines) {
uint16_t end_line = start_line+1;
// Find the limit of spans to draw in this cycle.
size_t spans = 1;
size_t lines = 1;
while(end_line != submit_pointers.line && !line_metadata_buffer_[end_line].is_first_in_frame) {
end_line = (end_line + 1) % LineBufferHeight;
++spans;
++lines;
}
// If this is start-of-frame, clear any untouched pixels and flush the stencil buffer
@@ -555,7 +555,7 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
}
// Upload.
const auto buffer_size = spans * sizeof(Line);
const auto buffer_size = lines * sizeof(Line);
if(!end_line || end_line > start_line) {
glBufferSubData(GL_ARRAY_BUFFER, 0, GLsizeiptr(buffer_size), &line_buffer_[start_line]);
} else {
@@ -575,20 +575,25 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
// Produce colour information, if required.
if(qam_separation_shader_) {
qam_chroma_texture_->bind_framebuffer();
qam_separation_shader_->bind();
qam_chroma_texture_->bind_framebuffer();
// glClear(GL_COLOR_BUFFER_BIT);
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, GLsizei(spans));
glDisable(GL_BLEND);
glDisable(GL_STENCIL_TEST);
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, GLsizei(lines));
accumulation_texture_->bind_framebuffer();
output_shader_->bind();
glEnable(GL_BLEND);
glEnable(GL_STENCIL_TEST);
}
// Render to the output.
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, GLsizei(spans));
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, GLsizei(lines));
start_line = end_line;
new_spans -= spans;
new_lines -= lines;
}
// Disable blending and the stencil test again.
@@ -603,6 +608,8 @@ void ScanTarget::draw(bool synchronous, int output_width, int output_height) {
glClear(GL_COLOR_BUFFER_BIT);
accumulation_texture_->bind_texture();
accumulation_texture_->draw(float(output_width) / float(output_height), 4.0f / 255.0f);
// qam_chroma_texture_->bind_texture();
// qam_chroma_texture_->draw(float(output_width) / float(output_height));
// All data now having been spooled to the GPU, update the read pointers to
// the submit pointer location.