使用帧缓冲和Oculus Rift的空白屏幕
OpenGL - Blank Screen with using Framebuffers and Oculus Rift
我有下面的代码，试图显示到Oculus Rift，但我得到一个空白屏幕。
没有显示，我不知道为什么。
请注意，我已经省略了一个相当大的项目的部分，但如果你觉得你需要更多的信息来解决这个问题，只是问!
/*
Initial Setup here.
Using OpenGL 3.1 as the project demands backwards compatibility.
*/
glfwWindowHint(GLFW_SAMPLES, 4); // 4x antialiasing
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); // We want OpenGL 3.1
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_ANY_PROFILE);
MainApplicationWindow = glfwCreateWindow((*DEFAULT_WINDOW_WIDTH), (*DEFAULT_WINDOW_HEIGHT), MAIN_WINDOW_TITLE, glfwGetPrimaryMonitor(), NULL);
if (MainApplicationWindow == NULL) {
glfwTerminate();
OpenGLInitialized = false;
return;
}
glfwMakeContextCurrent(MainApplicationWindow);
// Initialize GLEW
glewExperimental = true; // Needed in core profile
if (glewInit() != GLEW_OK) {
OpenGLInitialized = false;
return;
}
/*
The code that actually compiles the shaders omitted.
If needed can be produced.
*/
OpenGLCompileStatus = PrepareShadowMapShaders();
if (OpenGLCompileStatus != "SUCCESS") {
OpenGLInitialized = false;
return;
}
/*
Predefined GLuint.
*/
glUseProgram(g_StandardShaderProgram_ID);
/*
Further down program...
*/
glfwSetKeyCallback(MainOpenGLController->GetCurrentGLFWWindow(), KeyCallback);
glfwSetWindowSizeCallback(MainOpenGLController->GetCurrentGLFWWindow(), WindowResizeCallBack);
/*
This is how I set up everthing for the framebuffer for the Oculus Rift
*/
void SetupTheRift() {
ovr_Initialize();
CurrentRiftDevice = ovrHmd_Create(0);
ovrHmd_GetDesc(CurrentRiftDevice, &CurrentRiftDeviceDesc);
ovrHmd_StartSensor(CurrentRiftDevice, ovrHmdCap_Orientation | ovrHmdCap_YawCorrection |
ovrHmdCap_Position | ovrHmdCap_LowPersistence | ovrHmdCap_Orientation, 0);
l_TextureSizeLeft = ovrHmd_GetFovTextureSize(CurrentRiftDevice, ovrEye_Left, CurrentRiftDeviceDesc.DefaultEyeFov[0], 1.0f);
l_TextureSizeRight = ovrHmd_GetFovTextureSize(CurrentRiftDevice, ovrEye_Right, CurrentRiftDeviceDesc.DefaultEyeFov[1], 1.0f);
l_TextureSize;
l_TextureSize.w = l_TextureSizeLeft.w + l_TextureSizeRight.w;
l_TextureSize.h = (l_TextureSizeLeft.h>l_TextureSizeRight.h ? l_TextureSizeLeft.h : l_TextureSizeRight.h);
MainRiftDevice = CurrentRiftDevice;
MainRiftDeviceDesc = CurrentRiftDeviceDesc;
IsRiftAvailable = true;
l_TextureSizeLeft = ovrHmd_GetFovTextureSize((*MainRiftDevice), ovrEye_Left, MainRiftDeviceDesc->DefaultEyeFov[ovrEye_Left], 1.0f);
l_TextureSizeRight = ovrHmd_GetFovTextureSize((*MainRiftDevice), ovrEye_Right, MainRiftDeviceDesc->DefaultEyeFov[ovrEye_Right], 1.0f);
l_TextureSize.w = l_TextureSizeLeft.w + l_TextureSizeRight.w;
l_TextureSize.h = std::max(l_TextureSizeLeft.h, l_TextureSizeRight.h);
glGenFramebuffers(1, &g_OculusRiftFrameBufferObject_ID);
glBindFramebuffer(GL_FRAMEBUFFER, g_OculusRiftFrameBufferObject_ID);
glGenTextures(1, &g_OculusRiftTexture_ID);
glBindTexture(GL_TEXTURE_2D, g_OculusRiftTexture_ID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, l_TextureSize.w, l_TextureSize.h, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glGenRenderbuffers(1, &g_OculusRiftDepthBufferObject_ID);
glBindRenderbuffer(GL_RENDERBUFFER, g_OculusRiftDepthBufferObject_ID);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, l_TextureSize.w, l_TextureSize.h);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, g_OculusRiftDepthBufferObject_ID);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, g_OculusRiftTexture_ID, 0);
GLenum l_GLDrawBuffers[1] = { GL_COLOR_ATTACHMENT0 };
glDrawBuffers(1, l_GLDrawBuffers); // "1" is the size of DrawBuffers
g_DrawBufferStatusCheck_ENUM = glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER);
if (g_DrawBufferStatusCheck_ENUM != GL_FRAMEBUFFER_COMPLETE)
{
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glBindTexture(GL_TEXTURE_2D, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
return false;
}
else
{
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glBindTexture(GL_TEXTURE_2D, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
MainEyeDesc[ovrEye_Left].Eye = ovrEye_Left;
MainEyeDesc[ovrEye_Right].Eye = ovrEye_Right;
MainEyeDesc[ovrEye_Left].Fov = (*MainRiftDeviceDesc).DefaultEyeFov[ovrEye_Left];
MainEyeDesc[ovrEye_Right].Fov = (*MainRiftDeviceDesc).DefaultEyeFov[ovrEye_Right];
MainEyeDesc[ovrEye_Left].TextureSize.w = l_TextureSize.w;
MainEyeDesc[ovrEye_Left].TextureSize.h = l_TextureSize.h;
MainEyeDesc[ovrEye_Right].TextureSize.w = l_TextureSize.w;
MainEyeDesc[ovrEye_Right].TextureSize.h = l_TextureSize.h;
MainEyeDesc[ovrEye_Left].RenderViewport.Pos.x = 0;
MainEyeDesc[ovrEye_Left].RenderViewport.Pos.y = 0;
MainEyeDesc[ovrEye_Right].RenderViewport.Pos.x = (l_TextureSize.w + 1) / 2;
MainEyeDesc[ovrEye_Right].RenderViewport.Pos.y = 0;
MainEyeDesc[ovrEye_Left].RenderViewport.Size.w = l_TextureSize.w / 2;
MainEyeDesc[ovrEye_Left].RenderViewport.Size.h = l_TextureSize.h;
MainEyeDesc[ovrEye_Right].RenderViewport.Size.w = MainEyeDesc[ovrEye_Left].RenderViewport.Size.w;
MainEyeDesc[ovrEye_Right].RenderViewport.Size.h = MainEyeDesc[ovrEye_Left].RenderViewport.Size.h;
l_Cfg.OGL.Header.API = ovrRenderAPI_OpenGL;
l_Cfg.OGL.Header.Multisample = 0;
l_Cfg.OGL.Header.RTSize.w = (*MainRiftDeviceDesc).Resolution.w;
l_Cfg.OGL.Header.RTSize.h = (*MainRiftDeviceDesc).Resolution.h;
l_Cfg.OGL.WglContext = glfwGetWGLContext(MainApplicationWindow);
l_Cfg.OGL.Window = glfwGetWin32Window(MainApplicationWindow);
l_Cfg.OGL.GdiDc = GetDC(l_Cfg.OGL.Window);
int l_RenderCaps = 0;
int l_DistortionCaps = ovrDistortion_Chromatic | ovrDistortion_TimeWarp;
if (ovrHmd_ConfigureRendering((*MainRiftDevice), &l_Cfg.Config, l_RenderCaps,
l_DistortionCaps, MainEyeDesc, MainEyeRenderDesc) == false) {
return false;
}
l_EyeTexture[ovrEye_Left].OGL.Header.API = ovrRenderAPI_OpenGL;
l_EyeTexture[ovrEye_Left].OGL.Header.TextureSize.w = l_TextureSize.w;
l_EyeTexture[ovrEye_Left].OGL.Header.TextureSize.h = l_TextureSize.h;
l_EyeTexture[ovrEye_Left].OGL.Header.RenderViewport = MainEyeDesc[0].RenderViewport;
l_EyeTexture[ovrEye_Left].OGL.TexId = g_OculusRiftTexture_ID;
// Right eye uses the same texture, but a different rendering viewport...
l_EyeTexture[ovrEye_Right] = l_EyeTexture[ovrEye_Left];
l_EyeTexture[ovrEye_Right].OGL.Header.RenderViewport = MainEyeDesc[ovrEye_Right].RenderViewport;
return true;
}
/*
Then I load my Geometry.
Geometry previously loaded from file
*/
glBindFramebuffer(GL_FRAMEBUFFER, MainOpenGLController->GetOculusRiftFrameBufferObjectID());
glGenVertexArrays(1, &Pointer_VAO);
glBindVertexArray(Pointer_VAO);
// Create Vertex Buffer Object
glGenBuffers(1, &Vertex_VBO);
// Save vertex attributes into GPU
glBindBuffer(GL_ARRAY_BUFFER, Vertex_VBO);
glBufferData(GL_ARRAY_BUFFER, TotalVertexCount * Vertex_Stride * sizeof(GLfloat), &AllVertices[0], GL_STATIC_DRAW);
glVertexAttribPointer(Vertex_VBO, Vertex_Stride, GL_FLOAT, GL_FALSE, 0, 0);
delete[] Vertices;
if (HasNormals)
{
glGenBuffers(1, &Normal_VBO);
glBindBuffer(GL_ARRAY_BUFFER, Normal_VBO);
glBufferData(GL_ARRAY_BUFFER, TotalVertexCount * Normal_Stride * sizeof(GLfloat), &AllNormals[0], GL_STATIC_DRAW);
glEnableVertexAttribArray(Normal_VBO);
glVertexAttribPointer(Normal_VBO, Normal_Stride, GL_FLOAT, GL_FALSE, 0, 0);
delete[] Normals;
}
if (HasUVs)
{
glGenBuffers(1, &UV_VBO);
glBindBuffer(GL_ARRAY_BUFFER, UV_VBO);
glBufferData(GL_ARRAY_BUFFER, TotalVertexCount * UV_Stride * sizeof(GLfloat), &AllUVs[0], GL_STATIC_DRAW);
glEnableVertexAttribArray(UV_VBO);
glVertexAttribPointer(UV_VBO, UV_Stride, GL_FLOAT, GL_FALSE, 0, 0);
delete[] UVs;
}
glGenBuffers(1, &Index_VBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, Index_VBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, TotalPolygonCount * Triangle_Vertex_Count * sizeof(GLuint), &ALLIndices[0], GL_STATIC_DRAW);
delete[] Indices;
glBindVertexArray(0);
/*
And here is my drawing code.
*/
ovrFrameTiming m_HmdFrameTiming = ovrHmd_BeginFrame((*MainRiftDevice), 0);
glBindFramebuffer(GL_FRAMEBUFFER, g_OculusRiftFrameBufferObject_ID);
glClearColor(0.2f, 0.3f, 0.4f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//glEnable(GL_CULL_FACE);
//glEnable(GL_DEPTH_TEST);
for (int l_EyeIndex = 0; l_EyeIndex < ovrEye_Count; l_EyeIndex++) {
ovrEyeType l_Eye = (*MainRiftDeviceDesc).EyeRenderOrder[l_EyeIndex];
ovrPosef l_EyePose = ovrHmd_BeginEyeRender((*MainRiftDevice), l_Eye);
glViewport(MainEyeRenderDesc[l_Eye].Desc.RenderViewport.Pos.x,
MainEyeRenderDesc[l_Eye].Desc.RenderViewport.Pos.y,
MainEyeRenderDesc[l_Eye].Desc.RenderViewport.Size.w,
MainEyeRenderDesc[l_Eye].Desc.RenderViewport.Size.h);
DirectionOfWhereCameraIsFacing = glm::normalize(CenterOfWhatIsBeingLookedAt - PositionOfEyesOfPerson);
switch (CurrentCameraMode) {
case (ModeOfCamera::ORTHOGONAL) :
break;
Projection = glm::ortho(CurrentOrthoParameters.LeftPlane, CurrentOrthoParameters.RightPlane,
CurrentOrthoParameters.BottomPlane, CurrentOrthoParameters.TopPlane);
case (ModeOfCamera::PERSPECTIVE) :
default:
DirectionOfWhereCameraIsFacing = glm::vec3(l_EyePose.Orientation.x, l_EyePose.Orientation.y, l_EyePose.Orientation.z);
PositionOfEyesOfPerson += CameraPositionDelta;
PositionOfEyesOfPerson = PositionOfEyesOfPerson + glm::vec3(MainEyeRenderDesc[l_Eye].ViewAdjust.x, MainEyeRenderDesc[l_Eye].ViewAdjust.y, MainEyeRenderDesc[l_Eye].ViewAdjust.z);
CenterOfWhatIsBeingLookedAt = PositionOfEyesOfPerson + DirectionOfWhereCameraIsFacing * 1.0f;
break;
}
View = glm::lookAt(PositionOfEyesOfPerson, CenterOfWhatIsBeingLookedAt, DirectionOfUpForPerson);
Model = glm::mat4(1.0f);
ModelViewProjectionMatrix = Projection * View * Model;
ProjectionViewMatrix = Projection * View;
SetGlobalDirectionalLight();
if (CurrentShadingMode == SHADING_MODE_SHADED || CurrentShadingMode == SHADING_MODE_FULL_COLOR) {
glEnable(GL_TEXTURE_2D);
glUniform1i(GetEnableWireframeID(), 0);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
else {
glDisable(GL_TEXTURE_2D);
glUniform1i(GetEnableWireframeID(), 1);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
}
for (GLuint i = 0; i < MainMeshCache.size(); i++) {
MainMeshCache[i].DrawMe(this);
}
glBindVertexArray(0);
ovrHmd_EndEyeRender((*MainRiftDevice), l_Eye, l_EyePose, &l_EyeTexture[l_Eye].Texture);
}
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
ovrHmd_EndFrame((*MainRiftDevice));
glBindBuffer(GL_ARRAY_BUFFER, 0);
glEnable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
glClearDepth(1);
glUseProgramObjectARB(0);
/*
This is the "MainMeshCache" DrawMe Function.
*/
DrawMe(GlMaintenance* CurrentOpenGLController) {
glm::mat4 ModelViewMatrix = CurrentOpenGLController->GetViewMatrix() * ModelMatrix;
glm::mat3 NormalMatrix = glm::transpose(glm::inverse(glm::mat3(ModelViewMatrix)));
glm::mat4 ModelViewProjectionMatrix = CurrentOpenGLController->GetProjectionViewMatrix() * ModelMatrix;
glBindVertexArray(Pointer_VAO);
glUniformMatrix3fv(CurrentOpenGLController->GetNormalMatrixID(), 1, GL_FALSE,
glm::value_ptr(NormalMatrix));
glUniformMatrix4fv(CurrentOpenGLController->GetUniformGlobalPositionID(), 1, GL_FALSE, glm::value_ptr(ModelViewProjectionMatrix));
for (int i = 0; i < Materials.size(); i++) {
glUniform4fv(CurrentOpenGLController->GetEmmissiveMeshColorID(), 1, Materials[i].EmissiveColor);
glUniform4fv(CurrentOpenGLController->GetAmbientMeshColorID(), 1, Materials[i].AmbientColor);
glUniform4fv(CurrentOpenGLController->GetDiffuseMeshColorID(), 1, Materials[i].DiffuseColor);
glUniform4fv(CurrentOpenGLController->GetSpecularMeshColorID(), 1, Materials[i].SpecularColor);
glUniform4fv(CurrentOpenGLController->GetMaterialColorID(), 1, Materials[i].ObjectColor);
glUniform1f(CurrentOpenGLController->GetMeshShininessID(), Materials[i].Shininess);
glDrawElements(GL_TRIANGLES, (Materials[i].TriangleCount * 3)
, GL_UNSIGNED_INT, reinterpret_cast<const GLvoid *>(Materials[i].Offset * sizeof(unsigned int)));
}
}
编辑
忘了我的着色器…
/*
Vertex Shader
*/
#version 140
#extension GL_ARB_explicit_attrib_location : require
in vec4 vPosition;
in vec3 vNormal;
in vec2 vUV;
out vec3 SurfaceNormal;
uniform mat4 ModelViewProjectionMatrix;
uniform mat3 NormalMatrix;
void main () {
SurfaceNormal = normalize(NormalMatrix * vNormal);
gl_Position = ModelViewProjectionMatrix * vPosition;
}
/*
Fragment Shader
*/
#version 140
#extension GL_ARB_explicit_attrib_location : require
//
// These values vary per Mesh
//
uniform vec4 MaterialColor;
uniform vec4 AmbientMeshColor;
uniform vec4 EmmissiveMeshColor;
uniform vec4 DiffuseMeshColor;
uniform vec4 SpecularMeshColor;
uniform float MeshShininess;
//
// Wireframe Settings
//
uniform int EnableWireframe;
uniform vec4 WireframeColor;
//
// These values vary depending on settings in running context of the
// Shader program.
//
uniform int EnableLighting;
uniform int EnableSun;
uniform vec3 SunDirection;
uniform vec3 LightHalfVector;
uniform vec4 SunColor;
uniform vec4 SunSpotCutoff;
uniform float SunlightStrength;
//
// Surface normals vary per vertex.
//
in vec3 SurfaceNormal;
//
// Final output to the Fragment Shader Host Process.
//
out vec4 finalColor;
void main()
{
if (EnableWireframe == 1) {
finalColor = WireframeColor;
} else {
//
// Sunlight enabled. Do the calculations.
//
float DiffuseValue = max(0.0, dot(SurfaceNormal, SunDirection));
float SpecularValue = max(0.0, dot(SurfaceNormal, LightHalfVector));
if (DiffuseValue == 0.0) {
SpecularValue = 0.0;
} else {
SpecularValue = pow(SpecularValue, MeshShininess);
}
vec3 ScatteredLight = AmbientMeshColor.rgb + (SunColor.rgb * DiffuseValue);
vec3 ReflectedLight = SunColor.rgb * SpecularValue * SunlightStrength;
vec3 CalculatedColor = min(MaterialColor.rgb * ScatteredLight + ReflectedLight, vec3(1.0));
finalColor = vec4(CalculatedColor, MaterialColor.a);
}
}
glGenBuffers(1, &Vertex_VBO);
^^^^^^^^^^ with you so far....
...
glVertexAttribPointer(Vertex_VBO, Vertex_Stride, GL_FLOAT, GL_FALSE, 0, 0);
^^^^^^^^^^ mmmmnope, type mismatch
VBO id 不放在glVertexAttribPointer()的第一个参数中。它只用于属性索引。
你需要(以下其中之一):
- 在着色器链接
glBindAttribLocation()之前绑定属性位置 - 用
glGetAttribLocation()查询你的着色器程序(在链接后的)的属性索引 - 实际上使用
ARB_explicit_attrib_location并使用layout( location = xxx )在着色器中指定属性位置
一旦你弄清楚或决定了你的属性索引是什么，你可以把它们传递给glVertexAttribPointer()。
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