public void OnDrawFrame(IGL10 gl)
{
// 清除屏幕缓存和深度缓存
gl.GlClear(GL10.GlColorBufferBit | GL10.GlDepthBufferBit);
// 启用顶点坐标数据
gl.GlEnableClientState(GL10.GlVertexArray);
// 启用贴图坐标数组数据
gl.GlEnableClientState(GL10.GlTextureCoordArray); // ①
// 设置当前矩阵模式为模型视图。
gl.GlMatrixMode(GL10.GlModelview);
gl.GlLoadIdentity();
// 把绘图中心移入屏幕2个单位
gl.GlTranslatef(0f, 0.0f, -2.0f);
// 旋转图形
gl.GlRotatef(ma.angleY, 0, 1, 0);
gl.GlRotatef(ma.angleX, 1, 0, 0);
// 设置顶点的位置数据
gl.GlVertexPointer(3, GL10.GlFloat, 0, cubeVerticesBuffer);
// 设置贴图的坐标数据
gl.GlTexCoordPointer(2, GL10.GlFloat, 0, cubeTexturesBuffer); // ②
// 执行纹理贴图
gl.GlBindTexture(GL10.GlTexture2d, texture); // ③
// 按cubeFacetsBuffer指定的面绘制三角形
gl.GlDrawElements(GL10.GlTriangles, cubeFacetsBuffer.Remaining(),
GL10.GlUnsignedByte, cubeFacetsBuffer);
// 绘制结束
gl.GlFinish();
// 禁用顶点、纹理坐标数组
gl.GlDisableClientState(GL10.GlVertexArray);
gl.GlDisableClientState(GL10.GlTextureCoordArray);
// 递增角度值以便每次以不同角度绘制
}
public void Unbind()
{
IGL10 gl = _glGraphics.GL10;
if (_hasTexCoords)
{
gl.GlDisableClientState(GL10.GlTextureCoordArray);
}
if (_hasColor)
{
gl.GlDisableClientState(GL10.GlColorArray);
}
}
public void Draw(IGL10 gl)
{
gl.GlFrontFace(IGL10Constants.GL_CW);
gl.GlVertexPointer(3, IGL10Constants.GL_FLOAT, 0, mVertexBuffer);
gl.GlColorPointer(4, IGL10Constants.GL_FLOAT, 0, mColorBuffer);
gl.GlEnableClientState(IGL10Constants.GL_VERTEX_ARRAY);
gl.GlEnableClientState(IGL10Constants.GL_COLOR_ARRAY);
// draw all 36 triangles
gl.GlDrawElements(IGL10Constants.GL_TRIANGLES, 36, IGL10Constants.GL_UNSIGNED_BYTE,
mIndexBuffer);
gl.GlDisableClientState(IGL10Constants.GL_VERTEX_ARRAY);
gl.GlDisableClientState(IGL10Constants.GL_COLOR_ARRAY);
}
public void Draw(IGL10 gl)
{
gl.GlFrontFace(IGL10Constants.GL_CW);
gl.GlVertexPointer(3, IGL10Constants.GL_FLOAT, 0, mVertexBuffer);
gl.GlColorPointer(4, IGL10Constants.GL_FLOAT, 0, mColorBuffer);
gl.GlEnableClientState(IGL10Constants.GL_VERTEX_ARRAY);
gl.GlEnableClientState(IGL10Constants.GL_COLOR_ARRAY);
// draw all 36 triangles
gl.GlDrawElements(IGL10Constants.GL_TRIANGLES, 36, IGL10Constants.GL_UNSIGNED_BYTE,
mIndexBuffer);
gl.GlDisableClientState(IGL10Constants.GL_VERTEX_ARRAY);
gl.GlDisableClientState(IGL10Constants.GL_COLOR_ARRAY);
}
public void OnDrawFrame(IGL10 gl)
{
// First allocate texture if there is not one yet.
if (DRAW_TEXTURE && mTextureIds == null)
{
// Generate texture.
mTextureIds = new int[2];
gl.GlGenTextures(2, mTextureIds, 0);
foreach (int textureId in mTextureIds)
{
// Set texture attributes.
gl.GlBindTexture(GL10.GlTexture2d, textureId);
gl.GlTexParameterf(GL10.GlTexture2d,
GL10.GlTextureMinFilter, GL10.GlNearest);
gl.GlTexParameterf(GL10.GlTexture2d,
GL10.GlTextureMagFilter, GL10.GlNearest);
gl.GlTexParameterf(GL10.GlTexture2d, GL10.GlTextureWrapS,
GL10.GlClampToEdge);
gl.GlTexParameterf(GL10.GlTexture2d, GL10.GlTextureWrapT,
GL10.GlClampToEdge);
}
}
if (DRAW_TEXTURE && mTexturePage.TexturesChanged)
{
gl.GlBindTexture(GL10.GlTexture2d, mTextureIds[0]);
Bitmap texture = mTexturePage.GetTexture(mTextureRectFront,
CurlPage.SIDE_FRONT);
GLUtils.TexImage2D(GL10.GlTexture2d, 0, texture, 0);
texture.Recycle();
mTextureBack = mTexturePage.HasBackTexture;
if (mTextureBack)
{
gl.GlBindTexture(GL10.GlTexture2d, mTextureIds[1]);
texture = mTexturePage.GetTexture(mTextureRectBack,
CurlPage.SIDE_BACK);
GLUtils.TexImage2D(GL10.GlTexture2d, 0, texture, 0);
texture.Recycle();
}
else
{
mTextureRectBack.Set(mTextureRectFront);
}
mTexturePage.Recycle();
Reset();
}
// Some 'global' settings.
gl.GlEnableClientState(GL10.GlVertexArray);
// TODO: Drop shadow drawing is done temporarily here to hide some
// problems with its calculation.
if (DRAW_SHADOW)
{
gl.GlDisable(GL10.GlTexture2d);
gl.GlEnable(GL10.GlBlend);
gl.GlBlendFunc(GL10.GlSrcAlpha, GL10.GlOneMinusSrcAlpha);
gl.GlEnableClientState(GL10.GlColorArray);
gl.GlColorPointer(4, GL10.GlFloat, 0, mBufShadowColors);
gl.GlVertexPointer(3, GL10.GlFloat, 0, mBufShadowVertices);
gl.GlDrawArrays(GL10.GlTriangleStrip, 0, mDropShadowCount);
gl.GlDisableClientState(GL10.GlColorArray);
gl.GlDisable(GL10.GlBlend);
}
if (DRAW_TEXTURE)
{
gl.GlEnableClientState(GL10.GlTextureCoordArray);
gl.GlTexCoordPointer(2, GL10.GlFloat, 0, mBufTexCoords);
}
gl.GlVertexPointer(3, GL10.GlFloat, 0, mBufVertices);
// Enable color array.
gl.GlEnableClientState(GL10.GlColorArray);
gl.GlColorPointer(4, GL10.GlFloat, 0, mBufColors);
// Draw front facing blank vertices.
gl.GlDisable(GL10.GlTexture2d);
gl.GlDrawArrays(GL10.GlTriangleStrip, 0, mVerticesCountFront);
// Draw front facing texture.
if (DRAW_TEXTURE)
{
gl.GlEnable(GL10.GlBlend);
gl.GlEnable(GL10.GlTexture2d);
if (!mFlipTexture || !mTextureBack)
{
gl.GlBindTexture(GL10.GlTexture2d, mTextureIds[0]);
}
else
{
gl.GlBindTexture(GL10.GlTexture2d, mTextureIds[1]);
}
gl.GlBlendFunc(GL10.GlSrcAlpha, GL10.GlOneMinusSrcAlpha);
gl.GlDrawArrays(GL10.GlTriangleStrip, 0, mVerticesCountFront);
gl.GlDisable(GL10.GlBlend);
gl.GlDisable(GL10.GlTexture2d);
}
int backStartIdx = Math.Max(0, mVerticesCountFront - 2);
int backCount = mVerticesCountFront + mVerticesCountBack - backStartIdx;
// Draw back facing blank vertices.
gl.GlDrawArrays(GL10.GlTriangleStrip, backStartIdx, backCount);
// Draw back facing texture.
if (DRAW_TEXTURE)
{
gl.GlEnable(GL10.GlBlend);
gl.GlEnable(GL10.GlTexture2d);
if (mFlipTexture || !mTextureBack)
{
gl.GlBindTexture(GL10.GlTexture2d, mTextureIds[0]);
}
else
{
gl.GlBindTexture(GL10.GlTexture2d, mTextureIds[1]);
}
gl.GlBlendFunc(GL10.GlSrcAlpha, GL10.GlOneMinusSrcAlpha);
gl.GlDrawArrays(GL10.GlTriangleStrip, backStartIdx, backCount);
gl.GlDisable(GL10.GlBlend);
gl.GlDisable(GL10.GlTexture2d);
}
// Disable textures and color array.
gl.GlDisableClientState(GL10.GlTextureCoordArray);
gl.GlDisableClientState(GL10.GlColorArray);
if (DRAW_POLYGON_OUTLINES)
{
gl.GlEnable(GL10.GlBlend);
gl.GlBlendFunc(GL10.GlSrcAlpha, GL10.GlOneMinusSrcAlpha);
gl.GlLineWidth(1.0f);
gl.GlColor4f(0.5f, 0.5f, 1.0f, 1.0f);
gl.GlVertexPointer(3, GL10.GlFloat, 0, mBufVertices);
gl.GlDrawArrays(GL10.GlLineStrip, 0, mVerticesCountFront);
gl.GlDisable(GL10.GlBlend);
}
if (DRAW_CURL_POSITION)
{
gl.GlEnable(GL10.GlBlend);
gl.GlBlendFunc(GL10.GlSrcAlpha, GL10.GlOneMinusSrcAlpha);
gl.GlLineWidth(1.0f);
gl.GlColor4f(1.0f, 0.5f, 0.5f, 1.0f);
gl.GlVertexPointer(2, GL10.GlFloat, 0, mBufCurlPositionLines);
gl.GlDrawArrays(GL10.GlLines, 0, mCurlPositionLinesCount * 2);
gl.GlDisable(GL10.GlBlend);
}
if (DRAW_SHADOW)
{
gl.GlEnable(GL10.GlBlend);
gl.GlBlendFunc(GL10.GlSrcAlpha, GL10.GlOneMinusSrcAlpha);
gl.GlEnableClientState(GL10.GlColorArray);
gl.GlColorPointer(4, GL10.GlFloat, 0, mBufShadowColors);
gl.GlVertexPointer(3, GL10.GlFloat, 0, mBufShadowVertices);
gl.GlDrawArrays(GL10.GlTriangleStrip, mDropShadowCount,
mSelfShadowCount);
gl.GlDisableClientState(GL10.GlColorArray);
gl.GlDisable(GL10.GlBlend);
}
gl.GlDisableClientState(GL10.GlVertexArray);
}