0
我的程序沒有在屏幕上顯示任何東西。我嘗試了幾件事，但沒有成功。OpenGL根本沒有渲染任何東西
這裏是我的源代碼，頂點和片段着色器：
Renderer.cpp：
#include "Renderer.h"
Renderer::Renderer(Camera& camera, float w, float h)
:
cam(camera),
winW(w),
winH(h)
{}
Renderer::~Renderer()
{
glDeleteBuffers(1, &quad);
glDeleteBuffers(1, &color);
glDeleteBuffers(1, &UV);
glDeleteVertexArrays(1, &vao);
}
void Renderer::load()
{
projectionMatrix = glm::mat4(1.0f);
projectionMatrix = glm::perspective<float>(45.0f, (float) winW/(float) winH, 0.01f, 100.0f);
shader.loadAndCompile("Res/Shaders/std.vs", "Res/Shaders/std.fs");
texture.loadTexture("Res/Tex/sheet.png");
texture.bind();
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
Vertex quadArray[] = {
{ -0.5, -0.5, 0.0 },
{ -0.5, 0.5, 0.0 },
{ 0.5, -0.5, 0.0 },
{ 0.5, -0.5, 0.0 },
{ 0.5, 0.5, 0.0 },
{ -0.5, 0.5, 0.0 }
};
glUseProgram(shader.getProgram());
MVPLocation = glGetUniformLocation(shader.getProgram(), "MVP");
glGenBuffers(1, &quad);
glBindBuffer(GL_ARRAY_BUFFER, quad);
glBufferData(GL_ARRAY_BUFFER, sizeof(quadArray), quadArray, GL_STATIC_DRAW);
glGenBuffers(1, &color);
glBindBuffer(GL_ARRAY_BUFFER, color);
glBufferData(GL_ARRAY_BUFFER, 48, NULL, GL_STREAM_DRAW);
glGenBuffers(1, &UV);
glBindBuffer(GL_ARRAY_BUFFER, UV);
glBufferData(GL_ARRAY_BUFFER, 48, NULL, GL_STREAM_DRAW);
}
void Renderer::translate(glm::vec3 pos)
{
this->transMatrix = glm::translate(glm::mat4(1.0f), pos);
}
void Renderer::translate(float x, float y, float z)
{
translate(glm::vec3(x, y, z));
}
void Renderer::rotate(float angle, glm::vec3 axis)
{
this->rotationMatrix = glm::rotate(glm::mat4(1.0f), angle, axis);
}
void Renderer::scale(glm::vec3 scale)
{
this->scaleMatrix = glm::scale(glm::mat4(1.0f), scale);
}
void Renderer::scale(float x, float y, float z)
{
scale(glm::vec3(x, y, z));
}
void Renderer::drawSpriteBillboarded(glm::vec3 pos, glm::vec3 lookAtPos, int w, int h, int uP, int vP, glm::vec4 col)
{
int texW = texture.getWidth(), texH = texture.getHeight();
float u = (float) uP/(float) texW, v = (float) vP/(float) texH, uEnd = (float) (uP + w)/(float) texW, vEnd = (float) (vP + h)/(float) texH;
Color colArray[] = {
{ col.r, col.g, col.b, col.a },
{ col.r, col.g, col.b, col.a },
{ col.r, col.g, col.b, col.a },
{ col.r, col.g, col.b, col.a },
{ col.r, col.g, col.b, col.a },
{ col.r, col.g, col.b, col.a }
};
Vertex uvArray[] = {
{ u, v },
{ u, vEnd },
{ uEnd, v },
{ uEnd, v },
{ uEnd, vEnd },
{ u, vEnd }
};
translate(pos);
glm::vec2 dist = glm::vec2(lookAtPos.x, lookAtPos.z) - glm::vec2(pos.x, pos.z);
rotate(atan2f(dist.y, dist.x), glm::vec3(0, 1, 0));
scale(w/16 * 1.0, h/16 * 1.0, 1.0);
modelMatrix = transMatrix * rotationMatrix * scaleMatrix;
camTransMatrix = glm::translate(glm::mat4(1.0f), cam.getPos());
camRotationMatrix = glm::rotate(camRotationMatrix, cam.getRotX(), glm::vec3(1, 0, 0));
camRotationMatrix = glm::rotate(camRotationMatrix, cam.getRotY(), glm::vec3(0, 1, 0));
camRotationMatrix = glm::rotate(camRotationMatrix, cam.getRotZ(), glm::vec3(0, 0, 1));
viewMatrix = camTransMatrix * camRotationMatrix;
modelViewProjectionMatrix = projectionMatrix * viewMatrix * modelMatrix;
glUniformMatrix4fv(MVPLocation, 1, GL_FALSE, &modelViewProjectionMatrix[ 0 ][ 0 ]);
glBindBuffer(GL_ARRAY_BUFFER, quad);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*) 0);
glBindBuffer(GL_ARRAY_BUFFER, color);
glBufferData(GL_ARRAY_BUFFER, sizeof(colArray), colArray, GL_STREAM_DRAW);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, (void*)0);
glBindBuffer(GL_ARRAY_BUFFER, UV);
glBufferData(GL_ARRAY_BUFFER, sizeof(uvArray), uvArray, GL_STREAM_DRAW);
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, (void*)0);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
}
void Renderer::drawSprite(glm::vec3 pos, int w, int h, int uP, int vP, glm::vec4 col)
{}
頂點着色器
#version 330 core
layout(location = 0) in vec3 vertPosition;
layout(location = 1) in vec4 color;
layout(location = 2) in vec2 in_UV;
uniform mat4 MVP;
out vec4 col;
out vec2 uv;
void main(void)
{
gl_Position = MVP * vec4(vertPosition, 1.0);
col = color;
uv = in_UV;
}
片段着色器
#version 330 core
in vec4 col;
in vec2 uv;
out vec4 color;
uniform sampler2D tex;
void main(void)
{
vec4 Color = texture2D(tex, uv) * col;
color = Color;
}
我叫drawSprit eBillboarded功能從我的遊戲類，像這樣：
drawSpriteBillboarded(glm::vec3(0, 0, -5), cam.getPos(), 16, 16, 0, 0, glm::vec3(255, 255, 255, 255));
攝像機的位置爲0，0，0
我試着改變頂點着色器不被MVP矩陣相乘，並試圖改變片段着色器：
#version 330 core
in vec4 col;
in vec2 uv;
out vec4 color;
void main(void)
{
color = vec4(1.0, 1.0, 1.0, 1.0);
}
但它也沒有顯示任何東西。 我也試過將GL_TRIANGLES更改爲GL_POINTS，但沒有任何結果。
編輯
我還添加了loadAndCompile（）函數：
void Shader::loadAndCompile(const char* vertPath, const char* fragPath)
{
std::string vsCode = "";
std::ifstream vsStream(vertPath, std::ios::in);
fprintf(stdout, "loading vertex shader %s\n", vertPath);
if(vsStream.is_open())
{
std::string line;
while(std::getline(vsStream, line))
vsCode += line + '\n';
vsStream.close();
}
else
{
fprintf(stderr, "Error: could not find vertex shader %s\n", vertPath);
return;
}
std::string fsCode = "";
std::ifstream fsStream(fragPath, std::ios::in);
fprintf(stdout, "loading fragment shader %s\n", fragPath);
if(fsStream.is_open())
{
std::string line;
while(std::getline(fsStream, line))
fsCode += line + '\n';
fsStream.close();
}
else
{
fprintf(stderr, "Error: could not find fragment shader %s\n", fragPath);
return;
}
fprintf(stdout, "Compiling vertexShader %s\n", vertPath);
const char* vertCode = vsCode.c_str();
GLuint vertShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertShader, 1, &vertCode, NULL);
glCompileShader(vertShader);
GLint result = GL_FALSE;
int infoLogLength;
glGetShaderiv(vertShader, GL_COMPILE_STATUS, &result);
glGetShaderiv(vertShader, GL_INFO_LOG_LENGTH, &infoLogLength);
if(infoLogLength > 0)
{
std::vector<char> errorMsg(infoLogLength);
glGetShaderInfoLog(vertShader, infoLogLength, NULL, &errorMsg[ 0 ]);
fprintf(stderr, "%s\n", &errorMsg[ 0 ]);
}
fprintf(stdout, "Compiling fragmentShader %s\n", fragPath);
const char* fragCode = fsCode.c_str();
GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragShader, 1, &fragCode, NULL);
glCompileShader(fragShader);
glGetShaderiv(fragShader, GL_COMPILE_STATUS, &result);
glGetShaderiv(fragShader, GL_INFO_LOG_LENGTH, &infoLogLength);
if(infoLogLength > 0)
{
std::vector<char> errorMsg(infoLogLength);
glGetShaderInfoLog(fragShader, infoLogLength, NULL, &errorMsg[ 0 ]);
fprintf(stderr, "%s\n", &errorMsg[ 0 ]);
}
fprintf(stdout, "Linking program...\n");
GLuint tmpProgID = glCreateProgram();
glAttachShader(tmpProgID, vertShader);
glAttachShader(tmpProgID, fragShader);
glLinkProgram(tmpProgID);
glGetProgramiv(tmpProgID, GL_LINK_STATUS, &result);
glGetProgramiv(tmpProgID, GL_INFO_LOG_LENGTH, &infoLogLength);
if(infoLogLength > 0)
{
std::vector<char> errorMsg(infoLogLength);
glGetProgramInfoLog(tmpProgID, infoLogLength, NULL, &errorMsg[ 0 ]);
fprintf(stderr, "%s\n", &errorMsg[ 0 ]);
}
glDeleteShader(vertShader);
glDeleteShader(fragShader);
this->programID = tmpProgID;
}
所以我基本上是問你檢查我的代碼，看看我做了（傻）的錯誤。
它是否至少顯示白屏？你得到什麼輸出_do_？你有沒有嘗試檢查你的着色日誌，以確保他們正在加載？ – zero298
是的，他們正在加載他們應該的方式。我得到clearcolor背景屏幕 – Potte
你的函數是否只調用'loadAndCompile（...）'**加載並編譯**或者是否也***鏈接***着色器？因爲校服在鏈接之前不會有位置，如果您嘗試使用尚未鏈接的程序執行此操作，'glUseProgram（...）'也會產生錯誤。 –