渲染到CubeMap纹理
似乎每次传递都会使用相同的像素数据渲染cubeMap的所有六个面！
这是代码（我猜我的问题在这里）： 调用顺序在函数init（）中表示。
只需设置数据！这里不会有任何错误
void initRenderData( GLuint& m_sceneVAO, GLuint& m_sceneVBO, GLuint& m_sceneEBO, rcMeshLoaderObj** m_ppObjModel, float( bound )[6], std::string s = "fffzzz.obj" )
{
*m_ppObjModel = new rcMeshLoaderObj;
(*m_ppObjModel)->load(s);
(*m_ppObjModel)->getBoundBox(bound);
glGenVertexArrays ( 1, &m_sceneVAO );
glBindVertexArray ( m_sceneVAO );
glGenBuffers ( 1, &m_sceneVBO );
glBindBuffer ( GL_ARRAY_BUFFER, m_sceneVBO );
glBufferData ( GL_ARRAY_BUFFER, sizeof ( GLfloat )*(*m_ppObjModel)->getVertCount()*3, (*m_ppObjModel)->getVerts(), GL_STATIC_DRAW);
glVertexAttribPointer ( 0, 3, GL_FLOAT, GL_TRUE, 0, BUFFER_OFFSET ( 0 ) );
glEnableVertexAttribArray ( 0 );
//default value for normal attribute and color attribute
glVertexAttrib3f( 1, 0.0f, .0f, .0f );
glVertexAttrib4f( 2, 0.5f, 0.5f, 0.5f, 1.0f );
glGenBuffers ( 1, &m_sceneEBO );
glBindBuffer ( GL_ELEMENT_ARRAY_BUFFER, m_sceneEBO );
glBufferData ( GL_ELEMENT_ARRAY_BUFFER, sizeof ( unsigned int ) * 3 * (*m_ppObjModel)->getTriCount ( ), (*m_ppObjModel)->getTris ( ), GL_STATIC_DRAW );
}
//just draw the scene, could't be any error here eithor.
void drawModel( rcMeshLoaderObj* m_pObjModel, GLuint& m_sceneVAO, GLuint& m_sceneEBO)
{
glBindVertexArray(m_sceneVAO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_sceneEBO);
glDrawElements(
GL_TRIANGLES,
m_pObjModel->getTriCount() * 3,
GL_UNSIGNED_INT,
NULL);
}
生成cubeMap纹理和2d纹理
void genCubeTexture( GLuint& cubeMapTex, GLint internalFormat, GLenum format, GLenum type, GLsizei width, GLsizei height, GLint level = 0, const GLvoid * data = NULL )
{
glGenTextures( 1, &cubeMapTex );
glBindTexture( GL_TEXTURE_CUBE_MAP, cubeMapTex );
for ( GLuint face = 0; face < 6; face++) {
glTexImage2D( GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, internalFormat,
width, height, 0, format, type, data );
}
glTexParameteri( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
glTexParameteri( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
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_WRAP_R, GL_CLAMP_TO_EDGE );
glGenerateMipmap( GL_TEXTURE_CUBE_MAP );
glBindTexture( GL_TEXTURE_CUBE_MAP, 0 );
}
void genTexture2D( GLuint& texture2D, GLint internalFormat, GLenum format, GLenum type, GLsizei width, GLsizei height, GLint level = 0, const GLvoid * data = NULL )
{
glGenTextures( 1, &texture2D );
glBindTexture( GL_TEXTURE_2D, texture2D );
glTexImage2D( GL_TEXTURE_2D, level, internalFormat,
width, height, 0,
format, type, data );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL );
}
// no error would be here
void initShadowMapProgram ( GLuint & shadow_program)
{
ShaderInfo shaders[] = {
{GL_VERTEX_SHADER, "shadow.vert" },
{GL_FRAGMENT_SHADER, "shadow.frag" },
{GL_NONE, NULL }
};
shadow_program = LoadShaders ( shaders );
}
我猜错误来自下面的代码
void setDepthTexture (GLuint& shadow_program, GLuint& m_depthFBO, GLuint& m_shadowTexture, glm::vec3& lightPosition, rcMeshLoaderObj* model, GLuint& vao, GLuint& ebo )
{
//generate CubeMap textures separately used for framebuffer's color attachment0 and color attachment1.
glActiveTexture( GL_TEXTURE1 );
genCubeTexture( m_frame_buffer_color, GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, 1024, 1024 );
glActiveTexture( GL_TEXTURE2 );
genCubeTexture( m_shadowTexture, GL_R32F, GL_RED, GL_FLOAT, 1024, 1024 );
//generate a 2D texture used for framebuffer's depth attachment.
glActiveTexture( GL_TEXTURE3 );
genTexture2D( m_depthTexture, GL_DEPTH_COMPONENT32F, GL_DEPTH_COMPONENT, GL_FLOAT, 1024, 1024 );
glm::vec3 d, up;
glm::mat4 light_mvp_matrix;
GLint mvp_matrix_location = glGetUniformLocation ( shadow_program, "mvp_matrix" );
glUseProgram ( shadow_program );
glGenFramebuffers ( 1, &m_depthFBO );
glBindFramebuffer( GL_FRAMEBUFFER, m_depthFBO );
glFramebufferTexture( GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, m_depthTexture, 0 );
for( GLuint face = 0; face < 6; face++ )
{
glBindFramebuffer ( GL_FRAMEBUFFER, m_depthFBO );
glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, m_shadowTexture, 0 );
glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, m_frame_buffer_color, 0 );
switch( face )
{
case 0://X+
d = { 1.0f, 0.0f, 0.0f };
up = { 0.0f, 1.0f, 0.0f };
break;
case 1://X-
d = { -1.0f, 0.0f, 0.0f };
up = { 0.0f, 1.0f, 0.0f };
break;
case 2://Y+
d = { 0.0f, 1.0f, 0.0f };
up = { 0.0f, 0.0f, -1.0f };
break;
case 3://Y-
d = { 0.0f, -1.0f, 0.0f };
up = { 0.0f, 0.0f, 1.0f };
break;
case 4://Z+
d = { 0.0f, 0.0f, 1.0f };
up = { 0.0f, 1.0f, 0.0f };
break;
case 5://Z-
d = { 0.0f, 0.0f, -1.0f };
up = { 0.0f, 1.0f, 0.0f };
break;
default:
break;
}
GLenum status = glCheckFramebufferStatus( GL_FRAMEBUFFER );
if( status != GL_FRAMEBUFFER_COMPLETE )
printErrorMessage( status );
camera.setPDU( lightPosition, d, up );
light_mvp_matrix = lightPerspectiveMatrix*glm::lookAt( lightPosition, lightPosition + d, up );
glUniformMatrix4fv ( mvp_matrix_location, 1, GL_FALSE, glm::value_ptr ( light_mvp_matrix ) );
glClearDepth ( 1.0f );
glClearColor ( 0.0f, 0.0f, 0.0f, 1.0f );
glClear ( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
glEnable ( GL_DEPTH_TEST );
glEnable ( GL_POLYGON_OFFSET_FILL );
glViewport ( 0, 0, 1024, 1024 );
//glPolygonOffset ( 2.0f, 4.0f );
drawModel( model, vao, ebo );
//glPolygonOffset ( 0.0f, 0.0f );
glDisable ( GL_POLYGON_OFFSET_FILL );
}
glBindFramebuffer ( GL_FRAMEBUFFER, 0 );
glUseProgram( 0 );
}
//could't be here
void initRenderProgram(GLint& program, GLuint& m_shadowTexture, glm::vec3& lightPosition, Camera& camera)
{
ShaderInfo shaders[] = {
{GL_VERTEX_SHADER, "ObjModel.vert" },
{GL_GEOMETRY_SHADER, "ObjModel.geom" },
{GL_FRAGMENT_SHADER, "ObjModel.frag" },
{GL_NONE, NULL }
};
program = LoadShaders ( shaders );
glUseProgram ( program );
shadowTexture_location = glGetUniformLocation( program, "shadowTex" );
depthTexture_location = glGetUniformLocation( program, "depthTex" );
model_matrix_location = glGetUniformLocation ( program, "model_matrix" );
view_matrix_location = glGetUniformLocation ( program, "view_matrix" );
projection_matrix_location = glGetUniformLocation ( program, "projection_matrix" );
light_position_location = glGetUniformLocation( program, "light_position" );
material_ambient_location = glGetUniformLocation( program, "material_ambient" );
material_diffuse_location = glGetUniformLocation( program, "material_diffuse" );
material_specular_location = glGetUniformLocation( program, "material_specular" );
material_specular_power_location = glGetUniformLocation( program, "material_specular_power" );
eye_position_location = glGetUniformLocation( program, "eye_position" );
glActiveTexture( GL_TEXTURE1 );
glBindTexture( GL_TEXTURE_CUBE_MAP, m_shadowTexture );
glUniform1i ( shadowTexture_location, 1 );
glUniformMatrix4fv( model_matrix_location, 1, GL_FALSE, glm::value_ptr( glm::mat4( 1.0f ) ) );
glUniformMatrix4fv( view_matrix_location, 1, GL_FALSE, glm::value_ptr( camera.getViewMatrix( ) ) );
glUniformMatrix4fv( projection_matrix_location, 1, GL_FALSE, glm::value_ptr( camera.getProjectionMatrix( ) ) );
glUniform3f( light_position_location, lightPosition.x, lightPosition.y, lightPosition.z );
glUniform3f( material_ambient_location, 0.3f, 0.3f, 0.3f );
glUniform3f( material_diffuse_location, 0.4f, 0.4f, 0.4f );
glUniform3f( material_specular_location, 0.3f, 0.3f, 0.3f );
glUniform1f( material_specular_power_location, 20.0f );
glUniform3f( eye_position_location, camera.getPosition( ).x, camera.getPosition( ).y, camera.getPosition( ).z );
glUseProgram ( 0 );
glClearColor(0, 0, 0, 1);
glEnable(GL_DOUBLEBUFFER);
glEnable(GL_DEPTH_TEST);
}
致电订单
void init ( )
{
genSampler( m_shadowSampler );
initRenderData ( m_sceneVAO, m_sceneVBO, m_sceneEBO, &m_pObjModel, bound );
initShadowMapProgram( shadow_program );
setDepthTexture( shadow_program, m_depthFBO, m_shadowTexture, lightPosition, m_pObjModel, m_sceneVAO, m_sceneEBO );
initRenderProgram ( program, m_shadowTexture, lightPosition, camera );
}
可能在这里？
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//帧缓存附件之间的像素拷贝
glBindFramebuffer ( GL_FRAMEBUFFER, 0 );
glDrawBuffer ( GL_BACK );
for( GLuint face = 0; face < 6; face++ )
{
glBindFramebuffer( GL_READ_FRAMEBUFFER, m_depthFBO );
glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, m_frame_buffer_color, 0 );
glReadBuffer( GL_COLOR_ATTACHMENT1 );
GLfloat l, b;
switch( face )
{
case 0:
l = 0.5f;
b = 1.0f / 3;
break;
case 1:
l = 0.0f;
b = 1.0f / 3;
break;
case 2:
l = 0.25f;
b = 2.0f / 3;
break;
case 3:
l = 0.25f;
b = 0.0f;
break;
case 4:
l = 3.0f / 4;
b = 1.0f / 3;
break;
case 5:
l = 0.25f;
b = 1.0f / 3;
break;
default:
break;
}
glBlitFramebuffer( 0, 0, 1024, 1024,
0 + l * 400, viewPorts[0][3] - 300 + b * 300, l * 400 + 0.25f * 400, viewPorts[0][3] - 300 + b * 300 + 1.0f / 3 * 300 ,
GL_COLOR_BUFFER_BIT, GL_LINEAR );
}
glUseProgram ( program );
glUniformMatrix4fv( model_matrix_location, 1, GL_FALSE, glm::value_ptr( glm::mat4( 1.0f ) ) );
glUniformMatrix4fv( view_matrix_location, 1, GL_FALSE, glm::value_ptr( camera.getViewMatrix( ) ) );
glUniformMatrix4fv( projection_matrix_location, 1, GL_FALSE, glm::value_ptr( camera.getProjectionMatrix( ) ) );
glUniform3f( eye_position_location, camera.getPosition( ).x, camera.getPosition( ).y, camera.getPosition( ).z );
glViewport(viewPorts[0][0], viewPorts[0][1], viewPorts[0][2], viewPorts[0][3]);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glShadeModel(GL_SMOOTH);
drawModel( m_pObjModel, m_sceneVAO, m_sceneEBO );
glUseProgram ( 0 );
glViewport(viewPorts[0][0], viewPorts[0][1], viewPorts[0][2], viewPorts[0][3]);
glMatrixMode(GL_PROJECTION);
glLoadMatrixf ( glm::value_ptr ( camera.getViewProjectionMatrix ( ) ) );
glMatrixMode(GL_MODELVIEW);
glLoadIdentity ( );
drawBoundBox ( bound );
// glEnable(GL_POLYGON_OFFSET_FILL);//激活多边形偏移
// glPolygonOffset(1, 1);//计算出一个偏移值，以后每个片段的深度值都加上这个值
//glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
//glLineWidth ( 1 );
//glColor3f( 1.0f, 0.0f, 0.0f );
//glDrawElements(
// GL_TRIANGLES,
// m_pObjModel->getTriCount() * 3,
// GL_UNSIGNED_INT,
// NULL);
glUseProgram(0);
camera.drawCompass3D(viewPorts[1]);
glBindVertexArray(0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glFinish();
glutSwapBuffers();
}
这是图像：
我该怎么做才能修好它？我的显卡是GF840，有没有可能因为我的NV卡不支持一些新的GL功能？
1 个答案:
答案 0 :(得分：-1)
这是错误的：
glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, f, m_frame_buffer_color, 0 );
第三个参数必须是从GL_TEXTURE_CUBE_MAP_POSITIVE_X开始的GLenum，因此请将其更改为：
glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + f, m_frame_buffer_color, 0 );
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