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Switched to using quads for intermediate draws. The specific concern is the flexibility offered in the GL spec as to line drawing algorithms. And even if a driver implements exactly to spec then it should omit the final pixel.

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This commit is contained in:
Thomas Harte 2017-01-11 21:18:41 -05:00
parent d0a93409e6
commit b4159295f6
2 changed files with 6 additions and 2 deletions
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2
Outputs/CRT/Internals/CRTOpenGL.cpp
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@ -206,7 +206,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
}
// draw
glDrawArraysInstanced(GL_LINES, 0, 2, (GLsizei)array_submission.input_size / SourceVertexSize);
glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, (GLsizei)array_submission.input_size / SourceVertexSize);
active_pipeline++;
#ifdef GL_NV_texture_barrier

6
Outputs/CRT/Internals/Shaders/IntermediateShader.cpp
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@ -58,6 +58,7 @@ std::unique_ptr<IntermediateShader> IntermediateShader::make_shader(const char *
"{"
// odd vertices are on the left, even on the right
"float extent = float(gl_VertexID & 1);"
"float longitudinal = float((gl_VertexID & 2) >> 1);"
// inputPosition.x is either inputStart.x or ends.x, depending on whether it is on the left or the right;
// outputPosition.x is either outputStart.x or ends.y;
@ -65,6 +66,9 @@ std::unique_ptr<IntermediateShader> IntermediateShader::make_shader(const char *
"vec2 inputPosition = vec2(mix(inputStart.x, ends.x, extent)*widthScalers[0], inputStart.y + inputVerticalOffset);"
"vec2 outputPosition = vec2(mix(outputStart.x, ends.y, extent)*widthScalers[1], outputStart.y + outputVerticalOffset);"
"inputPosition.y += longitudinal;"
"outputPosition.y += longitudinal;"
// extension is the amount to extend both the input and output by to add a full colour cycle at each end
"vec2 extensionVector = vec2(extension, 0.0) * 2.0 * (extent - 0.5);"
@ -75,7 +79,7 @@ std::unique_ptr<IntermediateShader> IntermediateShader::make_shader(const char *
// keep iInputPositionVarying in whole source pixels, scale mappedInputPosition to the ordinary normalised range
"vec2 textureSize = vec2(textureSize(texID, 0));"
"iInputPositionVarying = extendedInputPosition;"
"vec2 mappedInputPosition = (extendedInputPosition) / textureSize;" // + vec2(0.0, 0.5)
"vec2 mappedInputPosition = extendedInputPosition / textureSize;" // + vec2(0.0, 0.5)
// setup input positions spaced as per the supplied offsets; these are for filtering where required
"inputPositionsVarying[0] = mappedInputPosition - (vec2(5.0, 0.0) / textureSize);"