OpenGL es2.0 加载纹理图片和CubMap

今天药忘吃喽~ 2022-08-07 10:35 153阅读 0赞

一、加载纹理：

public static int initTexture(int drawableId, Resources resources) {
    		int[] textures = new int[1];
    		GLES20.glGenTextures(1, textures, 0);
    		int textureId = textures[0];
    		GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);
    		GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
    		GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
    		GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_REPEAT);
    		GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_REPEAT);
    
    		InputStream is = resources.openRawResource(drawableId);
    		Bitmap bitmapTmp;
    		try {
    			bitmapTmp = BitmapFactory.decodeStream(is);
    		} finally {
    			try {
    				is.close();
    			} catch (Exception e) {
    				// TODO: handle exception
    				e.printStackTrace();
    			}
    		}
    		GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmapTmp, 0);
    		bitmapTmp.recycle();
    		return textureId;
    	}

二、加载CubMap：

public static int initCubeMap(int[] resourceIds, Resources resources) {
    		int[] ids = new int[1];
    		GLES20.glGenTextures(1, ids, 0);
    		int cubeMapTextureId = ids[0];
    		GLES20.glBindTexture(GLES20.GL_TEXTURE_CUBE_MAP, cubeMapTextureId);
    		GLES20.glTexParameterf(GLES20.GL_TEXTURE_CUBE_MAP, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
    		GLES20.glTexParameterf(GLES20.GL_TEXTURE_CUBE_MAP, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
    		GLES20.glTexParameterf(GLES20.GL_TEXTURE_CUBE_MAP, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_REPEAT);
    		GLES20.glTexParameterf(GLES20.GL_TEXTURE_CUBE_MAP, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_REPEAT);
    
    		for (int face = 0; face < 6; face++) {
    			InputStream is = resources.openRawResource(resourceIds[face]);
    			Bitmap bitmap;
    			try {
    				bitmap = BitmapFactory.decodeStream(is);
    			} finally {
    				try {
    					is.close();
    				} catch (Exception e) {
    					// TODO: handle exception
    					Log.e("CubeMap", "Could ont decode texture for face " + Integer.toString(face));
    				}
    			}
    			GLUtils.texImage2D(GLES20.GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, 0, bitmap, 0);
    			bitmap.recycle();
    		}
    
    		return cubeMapTextureId;
    	}