data2/json/DLP/1027878.json

{
  "ticketNumber" : "1027878",
  "reporterName" : "buaawkp",
  "rankPoints" : "1345",
  "resolutionStatus" : "",
  "ticketName" : "TDA2HG: [Opengl] -- the cube usage in fbo",
  "rankName" : "Expert",
  "replies" : "",
  "views" : "",
  "queryText" : "Part Number: TDA2HG Other Parts Discussed in Thread: TDA2 hi: I have a question about the usage of cubemap in fbo; the simple code as bellow: { glGenFramebuffers(1, &fboID); glBindFramebuffer(GL_FRAMEBUFFER,fboID); glGenTextures(1, &cubemapID); glBindTexture(GL_TEXTURE_CUBE_MAP, cubemapID); for (unsigned int i = 0; i < 6; ++i) { glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, 256, 256, 0, GL_RGB, GL_UNSIGNED_BYTE, nullptr); } glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glUniform.. //update the uniform variable glViewport(0, 0, 256, 256); for (unsigned int i = 0; i < 6; ++i) { glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, cubemapID, 0); if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) { printf(\"glCheckFramebufferStatus error!\\n\"); } glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); renderCube(); } } when i test the code, it works well on windows, but when i move it to the tda2 platform, the question is comming, sometimes the effiect is black , or is white, or white and black , or other colors, it's change every time. how is this? and how to resolved it? thanks",
  "imageList" : null,
  "partNumber" : "NA",
  "allResponseList" : [ {
    "contentId" : "",
    "userName" : "Hemant Hariyani",
    "rankPoints" : "8385",
    "rankName" : "TI__Expert",
    "date" : "",
    "userId" : "/members/4658",
    "content" : "Hello, Can you try and see if this works:     // Setup texture for cubemap\r\n    glGenTextures(1, &textureCubeMap);\r\n    char buffer0[CUBEMAP_TEX_LEN * CUBEMAP_TEX_LEN * 6];\r\n\r\n    glBindTexture(GL_TEXTURE_CUBE_MAP, textureCubeMap);\r\n    memset((void *)buffer0, 0x50, CUBEMAP_TEX_LEN*CUBEMAP_TEX_LEN*6);\r\n    for(GLuint i = 0; i < 6; i++)\r\n    {\r\n            glTexImage2D(\r\n                            GL_TEXTURE_CUBE_MAP_POSITIVE_X + i,\r\n                            0, GL_RGBA8, CUBEMAP_TEX_LEN, CUBEMAP_TEX_LEN,\r\n                            0, GL_RGBA, GL_UNSIGNED_BYTE, (char *)buffer0\r\n                        );\r\n    }\r\n\r\n    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);\r\n    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);\r\n    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);\r\n    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);\r\n    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);\r\n\r\n    // Setup Framebuffer for cubemap\r\n    glGenFramebuffers(1, &fbCubeMap);\r\n    \r\n    \r\n    // Rendering part\r\n    GLint current_fbo;\r\n    glGetIntegerv(GL_FRAMEBUFFER_BINDING, &current_fbo);\r\n    glBindFramebuffer(GL_FRAMEBUFFER, fbCubeMap);\r\n    \r\n    // Render to cubemap\r\n    for (int i = 0; i < 6; i++)\r\n\t{\r\n        glFramebufferTexture2D(GL_FRAMEBUFFER,\r\n\t\t    GL_COLOR_ATTACHMENT0,\r\n\t\t    GL_TEXTURE_CUBE_MAP_POSITIVE_X + i,\r\n\t\t    textureCubeMap,\r\n\t\t    0);\r\n\t    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);\r\n\t    //.... draw/render to cube map surface\r\n\t}\r\n\t\r\n\t// Bind the original frame buffer\r\n\tglBindFramebuffer(GL_FRAMEBUFFER, current_fbo);\r\n\t\r\n\t// Use cubemap texture\r\n\tglBindTexture(GL_TEXTURE_CUBE_MAP, textureCubeMap);\r\n\r\n    //... draw to the final framebuffer using cubemap\r\n    // In the shader code, use samplerCube to sample texture\r\n    // e.g:\r\n    // uniform samplerCube skybox;\r\n    // ...\r\n    // vec4 colorval = texture(skybox, direction);\r\n    \r\n\r\n    \r\n    \r\n\t    \r\n\r\n\r\n\r\n    \r\n\r\n\r\n If it still doesn't work, can you try and use glGetError to check for any errors? Regards Hemant",
    "imageList" : null
  } ],
  "tags" : [ ],
  "fourmType" : "processors-forum"
}