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https://github.com/ZDoom/raze-gles.git
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87 lines
2 KiB
C++
87 lines
2 KiB
C++
/*
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* glsurface.cpp
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* A 32-bit rendering surface that can quickly blit 8-bit paletted buffers implemented in OpenGL.
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*
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* Copyright © 2018, Alex Dawson. All rights reserved.
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*/
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#include "glsurface.h"
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#include "baselayer.h"
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#include "build.h"
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#include "tarray.h"
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#include "../../glbackend/glbackend.h"
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static TArray<uint8_t> buffer;
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static FHardwareTexture* bufferTexture;
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static vec2_t bufferRes;
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static FHardwareTexture* paletteTexture;
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bool glsurface_initialize(vec2_t bufferResolution)
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{
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if (buffer.Size())
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glsurface_destroy();
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bufferRes = bufferResolution;
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buffer.Resize(bufferRes.x * bufferRes.y);
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bufferTexture = GLInterface.NewTexture();
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bufferTexture->CreateTexture(bufferRes.x, bufferRes.y, true, false);
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glsurface_setPalette(curpalettefaded);
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GLInterface.SetSurfaceShader();
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return true;
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}
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void glsurface_destroy()
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{
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if (bufferTexture) delete bufferTexture;
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bufferTexture = nullptr;
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if (paletteTexture) delete paletteTexture;
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paletteTexture = nullptr;
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}
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void glsurface_setPalette(void* pPalette)
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{
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if (!buffer.Size())
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return;
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if (!pPalette)
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return;
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if (!paletteTexture)
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{
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paletteTexture = GLInterface.NewTexture();
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paletteTexture->CreateTexture(256, 1, false, false);
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}
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paletteTexture->LoadTexture(palette);
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GLInterface.BindTexture(1, paletteTexture, Sampler2DNoFilter);
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}
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void* glsurface_getBuffer()
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{
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return buffer.Data();
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}
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vec2_t glsurface_getBufferResolution()
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{
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return bufferRes;
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}
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void glsurface_blitBuffer()
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{
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if (!buffer.Size())
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return;
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bufferTexture->LoadTexture(buffer.Data());
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GLInterface.BindTexture(0, bufferTexture, Sampler2DNoFilter);
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auto data = GLInterface.AllocVertices(4);
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auto vt = data.second;
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vt[0].Set(-1.0f, 1.0f, 0.0f, 0.0f, 0.0f); //top-left
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vt[1].Set(-1.0f, -1.0f, 0.0f, 0.0f, 1.0f); //bottom-left
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vt[2].Set(1.0f, 1.0f, 0.0f, 1.0f, 0.0f); //top-right
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vt[3].Set(1.0f, -1.0f, 0.0f, 1.0f, 1.0f); //bottom-right
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GLInterface.Draw(DT_TRIANGLE_STRIP, data.first, 4);
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}
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