這是我很難看到你的問題是從，我可以建議的唯一的事情正在看一個Image2d類對象的構造函數，我來了。現在，我的源代碼取決於外部類，如ShaderManager類嚴重依賴模板類型，Batch類和BatchManager類將頂點發送到視頻卡。此Image2d也是一個繼承對象。但是，這可能會有助於您追蹤自己的問題。對於不同版本的實現，有兩種不同的構造函數，具體取決於正在使用哪種版本的OpenGL和GLSL。如果我沒有記錯的話，版本2使用BatchManager將頂點發送到版本1不支持的視頻卡，在render()方法中可以看到版本1。
Image2d 1.0
// ----------------------------------------------------------------------------
// Image2d()
Image2d::Image2d(float fWidth, float fHeight, TextureInfo::FilterQuality filterQuality, bool generateMipMap, const std::string& strTextureFilename, const std::string& strId) :
VisualMko(glm::uvec2(), strId),
m_vboTexture(0),
m_vboPosition(0),
m_vboIndices(0),
m_vao(0) {
if (fWidth <= 0 || fHeight <= 0) {
std::ostringstream strStream;
strStream << __FUNCTION__ << " Invalid image size (" << fWidth << "," << fHeight << ") must be more then 0 in each dimension.";
throw ExceptionHandler(strStream);
}
// Save TextureId
TextureFileReader textureFileReader(strTextureFilename);
m_textureInfo = textureFileReader.getOrCreateTextureInfo(filterQuality, generateMipMap, false);
// Define Texture Co-Ordinates
std::vector<float> vTextureCoordinates;
vTextureCoordinates.push_back(0.0f);
vTextureCoordinates.push_back(1.0f);
vTextureCoordinates.push_back(0);
vTextureCoordinates.push_back(0);
vTextureCoordinates.push_back(1.0f);
vTextureCoordinates.push_back(1.0f);
vTextureCoordinates.push_back(1.0f);
vTextureCoordinates.push_back(0);
// Define Vertex Positions (x,y,z)
std::vector<float> vVertexPositions;
vVertexPositions.push_back(0);
vVertexPositions.push_back(fHeight);
vVertexPositions.push_back(0);
vVertexPositions.push_back(0);
vVertexPositions.push_back(0);
vVertexPositions.push_back(0);
vVertexPositions.push_back(fWidth);
vVertexPositions.push_back(fHeight);
vVertexPositions.push_back(0);
vVertexPositions.push_back(fWidth);
vVertexPositions.push_back(0);
vVertexPositions.push_back(0);
// Define 2 Triangle Faces
std::vector<unsigned char> vIndices;
vIndices.push_back(0);
vIndices.push_back(1);
vIndices.push_back(2);
vIndices.push_back(3);
// Create Vertex Array Object
glGenVertexArrays(1, &m_vao);
glBindVertexArray(m_vao); // Start Array
m_pShaderManager->setAttribute(A_COLOR, COLOR_WHITE);
// Create Position Buffer And Store On Video Card
glGenBuffers(1, & m_vboPosition);
glBindBuffer(GL_ARRAY_BUFFER, m_vboPosition);
glBufferData(GL_ARRAY_BUFFER, vVertexPositions.size() * sizeof(vVertexPositions[0]), &vVertexPositions[0], GL_STATIC_DRAW);
m_pShaderManager->enableAttribute(A_POSITION);
// Create Texture Coordinate Buffer
glGenBuffers(1, &m_vboTexture);
glBindBuffer(GL_ARRAY_BUFFER, m_vboTexture);
glBufferData(GL_ARRAY_BUFFER, vTextureCoordinates.size() * sizeof(vTextureCoordinates[0]), &vTextureCoordinates[0], GL_STATIC_DRAW);
m_pShaderManager->enableAttribute(A_TEXTURE_COORD0);
// Create Index Buffer
glGenBuffers(1, &m_vboIndices);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_vboIndices);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, vIndices.size() * sizeof(vIndices[0]), &vIndices[0], GL_STATIC_DRAW);
glBindVertexArray(0); // Stop Array
// Disable Attribute Pointers
m_pShaderManager->disableAttribute(A_POSITION);
m_pShaderManager->disableAttribute(A_TEXTURE_COORD0);
// THIS MUST BE AFTER Vertex Array Buffer Is Unbound!
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); // Stop Buffer Index
glBindBuffer(GL_ARRAY_BUFFER, 0); // Stop Buffer
// We have a Valid Image2d Save Filename
m_strFilename = strTextureFilename;
} // Image2D - v1.0
Image2D - 2.0
// ----------------------------------------------------------------------------
// Image2d()
Image2d::Image2d(const glm::uvec2& origin, const glm::uvec2& size, const std::string& strTextureFilename, const std::string& strId) :
VisualMko(size, strId),
m_vboTexture(0),
m_vboPosition(0),
m_vboIndices(0),
m_vao(0) {
m_version = 2;
TextureFileReader textureFileReader(strTextureFilename);
m_textureInfo = textureFileReader.getOrCreateTextureInfo(TextureInfo::FILTER_NONE, false, false);
m_config.uTextureId = m_textureInfo.uTextureId;
if (0 == m_textureInfo.size.x || 0 == m_textureInfo.size.y) {
std::ostringstream strStream;
strStream << __FUNCTION__ << "size of " << strTextureFilename << " is invalid " << m_textureInfo.size;
throw ExceptionHandler(strStream);
}
// Verify Image Fits Inside Texture
if (m_textureInfo.size.x < size.x + origin.x || m_textureInfo.size.y < size.y + origin.y) {
std::ostringstream strStream;
strStream << __FUNCTION__ << " " << strTextureFilename << " size is " << m_textureInfo.size
<< " which is too small for an image that is " << size
<< " pixels in size, with an origin point set at " << origin ;
throw ExceptionHandler(strStream);
}
glm::vec2 textureCoordScaleFactor(1.0f/static_cast<float>(m_textureInfo.size.x),
1.0f/static_cast<float>(m_textureInfo.size.y));
glm::vec2 textureCoordBottomLeft = glm::vec2(textureCoordScaleFactor.x * origin.x,
textureCoordScaleFactor.y * (m_textureInfo.size.y - origin.y - size.y));
glm::vec2 textureCoordTopRight = glm::vec2(textureCoordScaleFactor.x * (origin.x + size.x),
textureCoordScaleFactor.y * (m_textureInfo.size.y - origin.y));
// Set Colors And Texture Coordinates (Position Will Be Updated In Render Function)
m_vVertices.push_back(GuiVertex(glm::vec2(), COLOR_WHITE, glm::vec2(textureCoordBottomLeft.x, textureCoordTopRight.y)));
m_vVertices.push_back(GuiVertex(glm::vec2(), COLOR_WHITE, glm::vec2(textureCoordBottomLeft.x, textureCoordBottomLeft.y)));
m_vVertices.push_back(GuiVertex(glm::vec2(), COLOR_WHITE, glm::vec2(textureCoordTopRight.x, textureCoordTopRight.y)));
m_vVertices.push_back(GuiVertex(glm::vec2(), COLOR_WHITE, glm::vec2(textureCoordTopRight.x, textureCoordBottomLeft.y)));
} // Image2d - v2.0
，這裏是我的render()方法
// ----------------------------------------------------------------------------
// render()
void Image2d::render() {
if (1 == m_version) {
m_pShaderManager->setTexture(0, U_TEXTURE0_SAMPLER_2D, m_textureInfo.uTextureId);
glBindVertexArray(m_vao);
glDrawElements(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_BYTE, nullptr);
glBindVertexArray(0);
} else {
// Version 2.0
// Update Vertices
if (m_transformMatrix.updateTranslation || m_transformMatrix.updateScale || m_transformMatrix.updateRotation) {
m_transformMatrix.updateTranslation = m_transformMatrix.updateScale = m_transformMatrix.updateRotation = false;
// Order Of Operations Matter Here!
glm::mat4 matrix; // Identity
if (m_transformMatrix.hasTranslation) {
matrix[3][0] = m_transformMatrix.translation.x;
matrix[3][1] = m_transformMatrix.translation.y;
}
if (m_transformMatrix.hasRotation) {
matrix = glm::rotate(matrix, m_transformMatrix.fRotationAngleRadians, glm::vec3(0.0f, 0.0f, -1.0f));
}
if (m_transformMatrix.hasScale) {
matrix = matrix * glm::mat4(m_transformMatrix.scale.x, 0.0f, 0.0f, 0.0f,
0.0f, m_transformMatrix.scale.y, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f);
}
// Center Offset
if (m_offsetPosition.x != 0 || m_offsetPosition.y != 0) {
matrix = glm::translate(matrix, glm::vec3(-m_offsetPosition.x, -m_offsetPosition.y, 0.0f));
}
// Apply Transformation To All 4 Vertices
m_vVertices[0].position = glm::vec2(matrix * glm::vec4( 0, 0, 0, 1.0f));
m_vVertices[1].position = glm::vec2(matrix * glm::vec4( 0, m_size.y, 0, 1.0f));
m_vVertices[2].position = glm::vec2(matrix * glm::vec4(m_size.x, 0, 0, 1.0f));
m_vVertices[3].position = glm::vec2(matrix * glm::vec4(m_size.x, m_size.y, 0, 1.0f));
}
renderBatch();
}
} // render
確保你的尺寸是規格在你的glBufferData(GL_ARRAY_BUFFER, RENDERER_BUFFER_SIZE, 0, GL_DYNAMIC_DRAW); 上做準確。還要確保在適當的時候停止VertexArray並禁用屬性指針。你綁定的所有東西都必須解除綁定，對於某些類型，Order很重要！
你的代碼是未定義的行爲。採樣器陣列在OpenGL中很特別。您不能使用從頂點屬性派生的非統一表達式作爲索引。我已經在[這個答案]中詳細解釋了這個問題（http://stackoverflow.com/questions/27972661/glsl-data-distortion/27973129#27973129）。 – derhass