解码dxtx1

main.cpp

@@ -118,6 +118,7 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 
 	/*´´½¨ÎÆÀí*/
 	GLuint mainTexture = CreateTextureFromFile("res/image/stone.jpg");
+	GLuint secondTexture = CreateTextureFromDds("res/image/150001.dds");
 
 	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 	glEnable(GL_DEPTH_TEST);
@@ -167,7 +168,7 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		glUniformMatrix4fv(PLocation, 1, GL_FALSE, glm::value_ptr(projection));
 		glUniformMatrix4fv(NMLocation, 1, GL_FALSE, glm::value_ptr(normalMatrix));
 
-		glBindTexture(GL_TEXTURE_2D, mainTexture);
+		glBindTexture(GL_TEXTURE_2D, secondTexture);
 		glUniform1i(textureLocation, 0);
 
 		glBindBuffer(GL_ARRAY_BUFFER, vbo);

misc.cpp

@@ -113,28 +113,34 @@ GLuint CreateGPUProgram(const char* vsShaderPath, const char* fsShaderPath) {
 	return program;
 }
 
-GLuint CreateTextureFromBMP(const char * imagePath)
-{
-	unsigned char* imgData = (unsigned char*)LoadFileContent(imagePath);
-	
-	if (*((unsigned short*)imgData) != 0x4D42) {
-		printf("cannot decode %s\n", imagePath);
-		return 0;
-	}
-
+static unsigned char* DecodeBMPData(unsigned char* imgData, int &width, int &height) {
 	//decode bmp
 	int pixelDataOffset = *((int*)(imgData + 10));
-	int width = *((int*)(imgData + 18));
-	int height = *((int*)(imgData + 22));
+	width = *((int*)(imgData + 18));
+	height = *((int*)(imgData + 22));
 
 	unsigned char* pixelData = imgData + pixelDataOffset;
 
 	//bgr ת rgb
-	for (int i = 0; i < width * height * 3; i+=3) {
+	for (int i = 0; i < width * height * 3; i += 3) {
 		unsigned char tmp = pixelData[i + 2];
 		pixelData[i + 2] = pixelData[i + 0];
 		pixelData[i + 0] = tmp;
 	}
+	return pixelData;
+}
+
+GLuint CreateTextureFromBMP(const char * imagePath)
+{
+	unsigned char* imgData = (unsigned char*)LoadFileContent(imagePath);
+	
+	if (*((unsigned short*)imgData) != 0x4D42) {
+		printf("cannot decode %s\n", imagePath);
+		return 0;
+	}
+
+	int width, height;
+	unsigned char* pixelData = DecodeBMPData(imgData, width, height);
 
 	GLuint texture;
 	glGenTextures(1, &texture);
@@ -151,7 +157,9 @@ GLuint CreateTextureFromBMP(const char * imagePath)
 	return texture;
 }
 
-GLuint CreateTexture(int w, int h, const void* data, GLenum type)
+
+
+static GLuint CreateTexture(int w, int h, const void* data, GLenum type)
 {
 	GLuint texId;
 	glGenTextures(1, &texId);
@@ -196,3 +204,54 @@ GLuint CreateTextureFromFile(const char * imagePath)
 	FreeImage_Unload(dib);
 	return      res;
 }
+
+const unsigned long FORMAT_DXT1 = 0x31545844l; // ÕâÀïÆäʵDXT1µ¹ÐðµÄasciiÂë
+static unsigned char* DecodeDXT1Data(unsigned char* imgData, int &width, int &height, int &pixelSize) {
+	height = *((int*)(imgData + sizeof(unsigned long) * 3));
+	width = *((int*)(imgData + sizeof(unsigned long) * 4));
+	pixelSize = *((int*)(imgData + sizeof(unsigned long) * 5));
+
+	unsigned long compressFormat;
+	compressFormat = *((int*)(imgData + sizeof(unsigned long) * 21));
+
+	switch (compressFormat) {
+	case FORMAT_DXT1:
+		printf("decode dxt1\n");
+		break;
+	}
+	unsigned char* pixelData = new unsigned char[pixelSize];
+
+	memcpy(pixelData, imgData + sizeof(unsigned long) * 32, pixelSize);
+		 
+	return pixelData;
+}
+
+GLuint CreateTextureFromDds(const char * imagePath)
+{
+	unsigned char* imgData = (unsigned char*)LoadFileContent(imagePath);
+
+	if (memcmp(imgData, "DDS ", 4) != 0) {
+		printf("cannot decode %s\n", imagePath);
+		return 0;
+	}
+
+	int width, height;
+	int pixelSize = 0;
+	unsigned char* pixelData = DecodeDXT1Data(imgData, width, height, pixelSize);
+
+	GLuint texture;
+	glGenTextures(1, &texture);
+	glBindTexture(GL_TEXTURE_2D, texture);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+	//GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
+	glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, width, height, 0, pixelSize, pixelData);
+
+	glBindTexture(GL_TEXTURE_2D, 0);
+
+	delete imgData;
+	return texture;
+}

misc.h

@@ -7,3 +7,4 @@ GLuint CompileShader(GLenum shaderType, const char* shaderPath);
 GLuint CreateGPUProgram(const char* vsShaderPath, const char* fsShaderPath);
 GLuint CreateTextureFromBMP(const char* imagePath);
 GLuint CreateTextureFromFile(const char* imagePath);
+GLuint CreateTextureFromDds(const char* imagePath);

res/shader/test.fs

@@ -26,7 +26,7 @@ void main() {
 	vec4 SpecularMaterial = vec4(0.9,0.9,0.9,1.0);
 	vec3 reflectDir = normalize(reflect(-L,n));//-L就是光线的入射方向向量，以法线为基础计算方式向量
 	vec3 viewDir = normalize(vec3(0.0) - V_WorldPos.xyz);//vec3(0.0)表示已中心为观察点，这里求的是眼睛到物体的视线向量
-	vec4 specularColor = SpecularLightColor*SpecularMaterial*pow(max(0.0,dot(viewDir,reflectDir)),28.0);
+	vec4 specularColor = SpecularLightColor*SpecularMaterial*pow(max(0.0,dot(viewDir,reflectDir)),128.0);
 
 
 	//gl_FragColor = texture2D(U_MainTexture, V_Texcoord) * (AmbientColor + diffuseColor + specularColor);