it renders shit!!
albeit in monochrome and with fucky clipping for some reason
This commit is contained in:
Arisotura
parent
32c75e20a6
commit
ccc9608ad2
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@ -42,6 +42,14 @@ PFNGLMAPBUFFERPROC glMapBuffer;
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PFNGLMAPBUFFERRANGEPROC glMapBufferRange;
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PFNGLUNMAPBUFFERPROC glUnmapBuffer;
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PFNGLBUFFERDATAPROC glBufferData;
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PFNGLBUFFERSUBDATAPROC glBufferSubData;
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PFNGLGENVERTEXARRAYSPROC glGenVertexArrays;
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PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays;
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PFNGLBINDVERTEXARRAYPROC glBindVertexArray;
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PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray;
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PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer;
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PFNGLVERTEXATTRIBIPOINTERPROC glVertexAttribIPointer;
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PFNGLCREATESHADERPROC glCreateShader;
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PFNGLSHADERSOURCEPROC glShaderSource;
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@ -60,12 +68,18 @@ PFNGLDELETEPROGRAMPROC glDeleteProgram;
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const char* kRenderVS = R"(#version 400
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in vec4 vPosition;
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layout(location=0) in uvec4 vPosition;
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void main()
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{
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// burp
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gl_Position = vPosition;
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vec4 fpos;
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fpos.x = ((float(vPosition.x) / 256.0) * 2.0) - 1.0;
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fpos.y = ((float(vPosition.y) / 192.0) * 2.0) - 1.0;
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fpos.z = 0.0;
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fpos.w = 1.0;
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gl_Position = fpos;
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}
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)";
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@ -75,13 +89,33 @@ out vec4 oColor;
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void main()
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{
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oColor = vec4(0,1,1,1);
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oColor = vec4(0, 63.0/255.0, 63.0/255.0, 31.0/255.0);
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}
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)";
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GLuint RenderShader[3];
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// vertex buffer
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// * XYZW: 4x16bit
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// * RGBA: 4x8bit
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// * ST: 2x16bit
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// * polygon data: 3x32bit (polygon/texture attributes)
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//
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// polygon attributes:
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// * bit4-7, 11, 14-15, 24-29: POLYGON_ATTR
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// * bit16-20: Z shift
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// * bit8: front-facing (?)
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// * bit9: W-buffering
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GLuint VertexBufferID;
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u32 VertexBuffer[10240 * 7];
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u32 NumVertices;
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GLuint VertexArrayID;
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u16 IndexBuffer[2048 * 10];
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u32 NumTriangles;
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GLuint FramebufferID, PixelbufferID;
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u8 Framebuffer[256*192*4];
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u8 CurLine[256*4];
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@ -105,6 +139,14 @@ bool InitGLExtensions()
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LOADPROC(GLMAPBUFFERRANGE, glMapBufferRange);
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LOADPROC(GLUNMAPBUFFER, glUnmapBuffer);
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LOADPROC(GLBUFFERDATA, glBufferData);
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LOADPROC(GLBUFFERSUBDATA, glBufferSubData);
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LOADPROC(GLGENVERTEXARRAYS, glGenVertexArrays);
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LOADPROC(GLDELETEVERTEXARRAYS, glDeleteVertexArrays);
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LOADPROC(GLBINDVERTEXARRAY, glBindVertexArray);
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LOADPROC(GLENABLEVERTEXATTRIBARRAY, glEnableVertexAttribArray);
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LOADPROC(GLVERTEXATTRIBPOINTER, glVertexAttribPointer);
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LOADPROC(GLVERTEXATTRIBIPOINTER, glVertexAttribIPointer);
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LOADPROC(GLCREATESHADER, glCreateShader);
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LOADPROC(GLSHADERSOURCE, glShaderSource);
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@ -150,7 +192,7 @@ bool BuildShaderProgram(const char* vs, const char* fs, GLuint* ids, const char*
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}
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ids[1] = glCreateShader(GL_FRAGMENT_SHADER);
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len = strlen(vs);
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len = strlen(fs);
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glShaderSource(ids[1], 1, &fs, &len);
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glCompileShader(ids[1]);
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@ -205,10 +247,31 @@ bool Init()
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printf("OpenGL: version: %s\n", version);
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// TODO: make configurable (hires, etc)
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glViewport(0, 0, 256, 192);
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glDepthRange(0, 1);
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if (!BuildShaderProgram(kRenderVS, kRenderFS, RenderShader, "RenderShader"))
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return false;
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glGenBuffers(1, &VertexBufferID);
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glBindBuffer(GL_ARRAY_BUFFER, VertexBufferID);
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glBufferData(GL_ARRAY_BUFFER, sizeof(VertexBuffer), NULL, GL_DYNAMIC_DRAW);
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glGenVertexArrays(1, &VertexArrayID);
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glBindVertexArray(VertexArrayID);
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glEnableVertexAttribArray(0); // position
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glVertexAttribIPointer(0, 4, GL_UNSIGNED_SHORT, 7*4, (void*)(0));
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glEnableVertexAttribArray(1); // color
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glVertexAttribIPointer(1, 4, GL_UNSIGNED_BYTE, 7*4, (void*)(2*4));
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glEnableVertexAttribArray(2); // texcoords
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glVertexAttribIPointer(2, 2, GL_UNSIGNED_SHORT, 7*4, (void*)(3*4));
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glEnableVertexAttribArray(3); // attrib
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glVertexAttribIPointer(3, 3, GL_UNSIGNED_INT, 7*4, (void*)(4*4));
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u8* test_tex = new u8[256*192*4];
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u8* ptr = test_tex;
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for (int y = 0; y < 192; y++)
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@ -264,13 +327,94 @@ void Reset()
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}
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void BuildPolygons(Polygon** polygons, int npolys)
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{
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u32* vptr = &VertexBuffer[0];
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u32 vidx = 0;
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u16* iptr = &IndexBuffer[0];
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u32 numtriangles = 0;
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for (int i = 0; i < npolys; i++)
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{
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Polygon* poly = polygons[i];
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if (poly->Degenerate) continue;
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u32 vidx_first = vidx;
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u32 polyattr = poly->Attr;
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u32 alpha = (polyattr >> 16) & 0x1F;
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u32 vtxattr = polyattr & 0x1F00C8F0;
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if (poly->FacingView) vtxattr |= (1<<8);
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if (poly->WBuffer) vtxattr |= (1<<9);
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// assemble vertices
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for (int j = 0; j < poly->NumVertices; j++)
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{
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Vertex* vtx = poly->Vertices[j];
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u32 z = poly->FinalZ[j];
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u32 w = poly->FinalW[j];
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// Z should always fit within 16 bits, so it's okay to do this
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u32 zshift = 0;
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while (z > 0xFFFF) { z >>= 1; zshift++; }
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// TODO hires-upgraded positions?
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*vptr++ = vtx->FinalPosition[0] | (vtx->FinalPosition[1] << 16);
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*vptr++ = z | (w << 16);
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*vptr++ = (vtx->FinalColor[0] >> 1) |
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((vtx->FinalColor[1] >> 1) << 8) |
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((vtx->FinalColor[2] >> 1) << 16) |
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(alpha << 24);
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*vptr++ = vtx->TexCoords[0] | (vtx->TexCoords[1] << 16);
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*vptr++ = vtxattr | (zshift << 16);
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*vptr++ = poly->TexParam;
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*vptr++ = poly->TexPalette;
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if (j >= 2)
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{
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// build a triangle
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*iptr++ = vidx_first;
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*iptr++ = vidx - 1;
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*iptr++ = vidx;
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numtriangles++;
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}
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vidx++;
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}
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}
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NumTriangles = numtriangles;
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NumVertices = vidx;
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}
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void VCount144()
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{
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}
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void RenderFrame()
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{
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// TODO: proper clear color!!
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glClearColor(0, 0, 0, 31.0/255.0);
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glClear(GL_COLOR_BUFFER_BIT);
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// render shit here
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glUseProgram(RenderShader[2]);
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BuildPolygons(&RenderPolygonRAM[0], RenderNumPolygons);
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glBindBuffer(GL_ARRAY_BUFFER, VertexBufferID);
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glBufferSubData(GL_ARRAY_BUFFER, 0, NumVertices*7*4, VertexBuffer);
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glBindVertexArray(VertexArrayID);
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glDrawElements(GL_TRIANGLES, NumTriangles, GL_UNSIGNED_SHORT, IndexBuffer);
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glBindFramebuffer(GL_FRAMEBUFFER, FramebufferID);
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glReadBuffer(GL_COLOR_ATTACHMENT0);
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