drawprim.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

    BYTE *data;
    WINED3DRECTPATCH_INFO *info = &patch->RectPatchInfo;
    DWORD vtxStride;
    GLenum feedback_type;
    GLfloat *feedbuffer;

    /* First, locate the position data. This is provided in a vertex buffer in the stateblock.
     * Beware of vbos
     */
    memset(&strided, 0, sizeof(strided));
    primitiveDeclarationConvertToStridedData((IWineD3DDevice *) This, FALSE, &strided, NULL);
    if(strided.u.s.position.VBO) {
        IWineD3DVertexBufferImpl *vb;
        vb = (IWineD3DVertexBufferImpl *) This->stateBlock->streamSource[strided.u.s.position.streamNo];
        strided.u.s.position.lpData = (BYTE *) ((unsigned long) strided.u.s.position.lpData +
                                                (unsigned long) vb->resource.allocatedMemory);
    }
    vtxStride = strided.u.s.position.dwStride;
    data = strided.u.s.position.lpData +
           vtxStride * info->Stride * info->StartVertexOffsetHeight +
           vtxStride * info->StartVertexOffsetWidth;

    /* Not entirely sure about what happens with transformed vertices */
    if(strided.u.s.position_transformed) {
        FIXME("Transformed position in rectpatch generation\n");
    }
    if(vtxStride % sizeof(GLfloat)) {
        /* glMap2f reads vertex sizes in GLfloats, the d3d stride is in bytes.
         * I don't see how the stride could not be a multiple of 4, but make sure
         * to check it
         */
        ERR("Vertex stride is not a multiple of sizeof(GLfloat)\n");
    }
    if(info->Basis != WINED3DBASIS_BEZIER) {
        FIXME("Basis is %s, how to handle this?\n", debug_d3dbasis(info->Basis));
    }
    if(info->Degree != WINED3DDEGREE_CUBIC) {
        FIXME("Degree is %s, how to handle this?\n", debug_d3ddegree(info->Degree));
    }

    /* First, get the boundary cube of the input data */
    for(j = 0; j < info->Height; j++) {
        for(i = 0; i < info->Width; i++) {
            float *v = (float *) (data + vtxStride * i + vtxStride * info->Stride * j);
            if(fabs(v[0]) > max_x) max_x = fabs(v[0]);
            if(fabs(v[1]) > max_y) max_y = fabs(v[1]);
            if(fabs(v[2]) > max_z) max_z = fabs(v[2]);
            if(v[2] < neg_z) neg_z = v[2];
        }
    }

    /* This needs some improvements in the vertex decl code */
    FIXME("Cannot find data to generate. Only generating position and normals\n");
    patch->has_normals = TRUE;
    patch->has_texcoords = FALSE;

    /* Simply activate the context for blitting. This disables all the things we don't want and
     * takes care of dirtifying. Dirtifying is preferred over pushing / popping, since drawing the
     * patch (as opposed to normal draws) will most likely need different changes anyway
     */
    ActivateContext(This, This->lastActiveRenderTarget, CTXUSAGE_BLIT);
    ENTER_GL();

    glMatrixMode(GL_PROJECTION);
    checkGLcall("glMatrixMode(GL_PROJECTION)");
    glLoadIdentity();
    checkGLcall("glLoadIndentity()");
    glScalef(1 / (max_x) , 1 / (max_y), max_z == 0 ? 1 : 1 / ( 2 * max_z));
    glTranslatef(0, 0, 0.5);
    checkGLcall("glScalef");
    glViewport(-max_x, -max_y, 2 * (max_x), 2 * (max_y));
    checkGLcall("glViewport");

    /* Some states to take care of. If we're in wireframe opengl will produce lines, and confuse
     * our feedback buffer parser
     */
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    checkGLcall("glPolygonMode(GL_FRONT_AND_BACK, GL_FILL)");
    IWineD3DDeviceImpl_MarkStateDirty(This, STATE_RENDER(WINED3DRS_FILLMODE));
    if(patch->has_normals) {
        float black[4] = {0, 0, 0, 0};
        float red[4]   = {1, 0, 0, 0};
        float green[4] = {0, 1, 0, 0};
        float blue[4]  = {0, 0, 1, 0};
        float white[4] = {1, 1, 1, 1};
        glEnable(GL_LIGHTING);
        checkGLcall("glEnable(GL_LIGHTING)");
        glLightModelfv(GL_LIGHT_MODEL_AMBIENT, black);
        checkGLcall("glLightModel for MODEL_AMBIENT");
        IWineD3DDeviceImpl_MarkStateDirty(This, STATE_RENDER(WINED3DRS_AMBIENT));

        for(i = 3; i < GL_LIMITS(lights); i++) {
            glDisable(GL_LIGHT0 + i);
            checkGLcall("glDisable(GL_LIGHT0 + i)");
            IWineD3DDeviceImpl_MarkStateDirty(This, STATE_ACTIVELIGHT(i));
        }

        IWineD3DDeviceImpl_MarkStateDirty(This, STATE_ACTIVELIGHT(0));
        glLightfv(GL_LIGHT0, GL_DIFFUSE, red);
        glLightfv(GL_LIGHT0, GL_SPECULAR, black);
        glLightfv(GL_LIGHT0, GL_AMBIENT, black);
        glLightfv(GL_LIGHT0, GL_POSITION, red);
        glEnable(GL_LIGHT0);
        checkGLcall("Setting up light 1\n");
        IWineD3DDeviceImpl_MarkStateDirty(This, STATE_ACTIVELIGHT(1));
        glLightfv(GL_LIGHT1, GL_DIFFUSE, green);
        glLightfv(GL_LIGHT1, GL_SPECULAR, black);
        glLightfv(GL_LIGHT1, GL_AMBIENT, black);
        glLightfv(GL_LIGHT1, GL_POSITION, green);
        glEnable(GL_LIGHT1);
        checkGLcall("Setting up light 2\n");
        IWineD3DDeviceImpl_MarkStateDirty(This, STATE_ACTIVELIGHT(2));
        glLightfv(GL_LIGHT2, GL_DIFFUSE, blue);
        glLightfv(GL_LIGHT2, GL_SPECULAR, black);
        glLightfv(GL_LIGHT2, GL_AMBIENT, black);
        glLightfv(GL_LIGHT2, GL_POSITION, blue);
        glEnable(GL_LIGHT2);
        checkGLcall("Setting up light 3\n");

        IWineD3DDeviceImpl_MarkStateDirty(This, STATE_MATERIAL);
        IWineD3DDeviceImpl_MarkStateDirty(This, STATE_RENDER(WINED3DRS_COLORVERTEX));
        glDisable(GL_COLOR_MATERIAL);
        glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, black);
        glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, black);
        glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, white);
        checkGLcall("Setting up materials\n");
    }

    /* Enable the needed maps.
     * GL_MAP2_VERTEX_3 is needed for positional data.
     * GL_AUTO_NORMAL to generate normals from the position. Do not use GL_MAP2_NORMAL.
     * GL_MAP2_TEXTURE_COORD_4 for texture coords
     */
    num_quads = ceilf(patch->numSegs[0]) * ceilf(patch->numSegs[1]);
    out_vertex_size = 3 /* position */;
    d3d_out_vertex_size = 3;
    glEnable(GL_MAP2_VERTEX_3);
    if(patch->has_normals && patch->has_texcoords) {
        FIXME("Texcoords not handled yet\n");
        feedback_type = GL_3D_COLOR_TEXTURE;
        out_vertex_size += 8;
        d3d_out_vertex_size += 7;
        glEnable(GL_AUTO_NORMAL);
        glEnable(GL_MAP2_TEXTURE_COORD_4);
    } else if(patch->has_texcoords) {
        FIXME("Texcoords not handled yet\n");
        feedback_type = GL_3D_COLOR_TEXTURE;
        out_vertex_size += 7;
        d3d_out_vertex_size += 4;
        glEnable(GL_MAP2_TEXTURE_COORD_4);
    } else if(patch->has_normals) {
        feedback_type = GL_3D_COLOR;
        out_vertex_size += 4;
        d3d_out_vertex_size += 3;
        glEnable(GL_AUTO_NORMAL);
    } else {
        feedback_type = GL_3D;
    }
    checkGLcall("glEnable vertex attrib generation");

    buffer_size = num_quads * out_vertex_size * 2 /* triangle list */ * 3 /* verts per tri */
                   + 4 * num_quads /* 2 triangle markers per quad + num verts in tri */;
    feedbuffer = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, buffer_size * sizeof(float) * 8);

    glMap2f(GL_MAP2_VERTEX_3,
            0, 1, vtxStride / sizeof(float), info->Width,
            0, 1, info->Stride * vtxStride / sizeof(float), info->Height,
            (float *) data);
    checkGLcall("glMap2f");
    if(patch->has_texcoords) {
        glMap2f(GL_MAP2_TEXTURE_COORD_4,
                0, 1, vtxStride / sizeof(float), info->Width,
                0, 1, info->Stride * vtxStride / sizeof(float), info->Height,
                (float *) data);
        checkGLcall("glMap2f");
    }
    glMapGrid2f(ceilf(patch->numSegs[0]), 0.0, 1.0, ceilf(patch->numSegs[1]), 0.0, 1.0);
    checkGLcall("glMapGrid2f");

    glFeedbackBuffer(buffer_size * 2, feedback_type, feedbuffer);
    checkGLcall("glFeedbackBuffer");
    glRenderMode(GL_FEEDBACK);

    glEvalMesh2(GL_FILL, 0, ceilf(patch->numSegs[0]), 0, ceilf(patch->numSegs[1]));
    checkGLcall("glEvalMesh2\n");

    i = glRenderMode(GL_RENDER);
    if(i == -1) {
        ERR("Feedback failed. Expected %d elements back\n", buffer_size);
        Sleep(10000);
        HeapFree(GetProcessHeap(), 0, feedbuffer);
        return WINED3DERR_DRIVERINTERNALERROR;
    } else if(i != buffer_size) {
        ERR("Unexpected amount of elements returned. Expected %d, got %d\n", buffer_size, i);
        Sleep(10000);
        HeapFree(GetProcessHeap(), 0, feedbuffer);
        return WINED3DERR_DRIVERINTERNALERROR;
    } else {
        TRACE("Got %d elements as expected\n", i);
    }

    HeapFree(GetProcessHeap(), 0, patch->mem);
    patch->mem = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, num_quads * 6 * d3d_out_vertex_size * sizeof(float) * 8);
    i = 0;
    for(j = 0; j < buffer_size; j += (3 /* num verts */ * out_vertex_size + 2 /* tri marker */)) {
        if(feedbuffer[j] != GL_POLYGON_TOKEN) {
            ERR("Unexpected token: %f\n", feedbuffer[j]);
            continue;
        }
        if(feedbuffer[j + 1] != 3) {
            ERR("Unexpected polygon: %f corners\n", feedbuffer[j + 1]);
            continue;
        }
        /* Somehow there are different ideas about back / front facing, so fix up the
         * vertex order
         */
        patch->mem[i + 0] =  feedbuffer[j + out_vertex_size * 2 + 2]; /* x, triangle 2 */
        patch->mem[i + 1] =  feedbuffer[j + out_vertex_size * 2 + 3]; /* y, triangle 2 */
        patch->mem[i + 2] = (feedbuffer[j + out_vertex_size * 2 + 4] - 0.5) * 4 * max_z; /* z, triangle 3 */
        if(patch->has_normals) {
            patch->mem[i + 3] = feedbuffer[j + out_vertex_size * 2 + 5];
            patch->mem[i + 4] = feedbuffer[j + out_vertex_size * 2 + 6];
            patch->mem[i + 5] = feedbuffer[j + out_vertex_size * 2 + 7];
        }
        i += d3d_out_vertex_size;

        patch->mem[i + 0] =  feedbuffer[j + out_vertex_size * 1 + 2]; /* x, triangle 2 */
        patch->mem[i + 1] =  feedbuffer[j + out_vertex_size * 1 + 3]; /* y, triangle 2 */
        patch->mem[i + 2] = (feedbuffer[j + out_vertex_size * 1 + 4] - 0.5) * 4 * max_z; /* z, triangle 2 */
        if(patch->has_normals) {
            patch->mem[i + 3] = feedbuffer[j + out_vertex_size * 1 + 5];
            patch->mem[i + 4] = feedbuffer[j + out_vertex_size * 1 + 6];
            patch->mem[i + 5] = feedbuffer[j + out_vertex_size * 1 + 7];
        }
        i += d3d_out_vertex_size;

        patch->mem[i + 0] =  feedbuffer[j + out_vertex_size * 0 + 2]; /* x, triangle 1 */
        patch->mem[i + 1] =  feedbuffer[j + out_vertex_size * 0 + 3]; /* y, triangle 1 */
        patch->mem[i + 2] = (feedbuffer[j + out_vertex_size * 0 + 4] - 0.5) * 4 * max_z; /* z, triangle 1 */
        if(patch->has_normals) {
            patch->mem[i + 3] = feedbuffer[j + out_vertex_size * 0 + 5];
            patch->mem[i + 4] = feedbuffer[j + out_vertex_size * 0 + 6];
            patch->mem[i + 5] = feedbuffer[j + out_vertex_size * 0 + 7];
        }
        i += d3d_out_vertex_size;
    }

    if(patch->has_normals) {
        /* Now do the same with reverse light directions */
        float x[4] = {-1,  0,  0, 0};
        float y[4] = { 0, -1,  0, 0};
        float z[4] = { 0,  0, -1, 0};
        glLightfv(GL_LIGHT0, GL_POSITION, x);
        glLightfv(GL_LIGHT1, GL_POSITION, y);
        glLightfv(GL_LIGHT2, GL_POSITION, z);
        checkGLcall("Setting up reverse light directions\n");

        glRenderMode(GL_FEEDBACK);
        checkGLcall("glRenderMode(GL_FEEDBACK)");
        glEvalMesh2(GL_FILL, 0, ceilf(patch->numSegs[0]), 0, ceilf(patch->numSegs[1]));
        checkGLcall("glEvalMesh2\n");
        i = glRenderMode(GL_RENDER);
        checkGLcall("glRenderMode(GL_RENDER)");

        i = 0;
        for(j = 0; j < buffer_size; j += (3 /* num verts */ * out_vertex_size + 2 /* tri marker */)) {
            if(feedbuffer[j] != GL_POLYGON_TOKEN) {
                ERR("Unexpected token: %f\n", feedbuffer[j]);
                continue;
            }
            if(feedbuffer[j + 1] != 3) {
                ERR("Unexpected polygon: %f corners\n", feedbuffer[j + 1]);
                continue;
            }
            if(patch->mem[i + 3] == 0.0)
                patch->mem[i + 3] = -feedbuffer[j + out_vertex_size * 2 + 5];
            if(patch->mem[i + 4] == 0.0)
                patch->mem[i + 4] = -feedbuffer[j + out_vertex_size * 2 + 6];
            if(patch->mem[i + 5] == 0.0)
                patch->mem[i + 5] = -feedbuffer[j + out_vertex_size * 2 + 7];
            normalize_normal(patch->mem + i + 3);
            i += d3d_out_vertex_size;

            if(patch->mem[i + 3] == 0.0)
                patch->mem[i + 3] = -feedbuffer[j + out_vertex_size * 1 + 5];
            if(patch->mem[i + 4] == 0.0)
                patch->mem[i + 4] = -feedbuffer[j + out_vertex_size * 1 + 6];
            if(patch->mem[i + 5] == 0.0)
                patch->mem[i + 5] = -feedbuffer[j + out_vertex_size * 1 + 7];
            normalize_normal(patch->mem + i + 3);
            i += d3d_out_vertex_size;

            if(patch->mem[i + 3] == 0.0)
                patch->mem[i + 3] = -feedbuffer[j + out_vertex_size * 0 + 5];
            if(patch->mem[i + 4] == 0.0)
                patch->mem[i + 4]